28549300 Answer Book VIII Science

8/13/2019 28549300 Answer Book VIII Science

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COMPREHENSIVE ANWER SHEET FOR CLASS VIII

SUBJECT: SCIENCE TOTAL CHAPTERS: 18

CHAPTER: 1 CROP PRODUCTION AND MANAGEMENT

Q1) Select the correct word fro the follow!"# l!$t %"d f!ll !" the &l%"'$(

flo%t w%ter cro* "+tr!e"t$ *re*%r%t!o"

,%) The $%e '!"d of *l%"t$ #row" %"d c+lt!-%ted o" % l%r#e $c%le %t % *l%ce !$ c%lled . cro* .(

,&) The f!r$t $te* &efore #row!"# cro*$ !$ . *re*%r%t!o".. of the $o!l(

,c) /%%#ed $eed$ wo+ld ..flo%t.. o" to* of w%ter(

,d) 0or #row!"# % cro* $+ff!c!e"t $+"l!#ht %"d . w%ter .. %"d . "+tr!e"t$. fro the $o!l %re e$$e"t!%l(

Q) 2%tch !te$ !" col+" A w!th tho$e !" col+" B(

Ans:

A B

,!) Kharifcro*$ ,e) P%dd3 %"d %!4e

,!!) Rabicro*$ ,d

)

5he%t #r% *e%

,!!!

)

Che!c%l fert!l!$er$ ,&

)

Ure% %"d $+*er *ho$*h%te

,!-) Or#%"!c %"+re ,c) A"!%l e6cret% cow d+"# +r!"e %"d *l%"t w%$te

Q7) !-e two e6%*le$ of e%ch(

,%)Kharif cro*

,&)Rabi cro*

A"$: ,%)Kharif cro* 9 P%dd3 %!4e

,&)Rabi cro* 9 5he%t #r%

Q) 5r!te % *%r%#r%*h !" 3o+r ow" word$ o" e%ch of the follow!"#(

,%) Pre*%r%t!o" of $o!l ,&) Sow!"#

,c) 5eed!"# ,d) Thre$h!"#

A"$: ,%) Preparation of soil:

It !$ the f!r$t ethod to &e followed &efore #row!"# % cro*( Th!$ ethod !$ +$+%ll3 e*lo3ed for

loo$e"!"# the $o!l to %llow the root to *e"etr%te dee* !"to !t( The loo$e"!"# of the $o!l hel*$ !" the

#rowth of $e-er%l $o!l !cro&e$ e%rthwor$ etc( wh!ch e"r!ch the $o!l w!th h++$ %"d other e$$e"t!%l

"+tr!e"t$( Pl%"t$ re;+!re "+tr!e"t$ for the!r *ro*er #rowth %"d f+"ct!o"!"#( The *roce$$ of loo$e"!"# !$

c%lled t!ll!"# or *lo+#h!"# the $o!l( T!ll!"# of $o!l &r!"#$ the "+tr!e"t


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Now%d%3$ $eed dr!ll$ th%t %'e the +$e of tr%ctor$ %re +$ed for $ow!"# $eed$( Th!$ tool d!$*er$e$

$eed$ +"!forl3 %"d $ow$ $eed$ %t *ro*er de*th( Sow!"# &3 th!$ ethod $%-e$ t!e %"d %l$o *rotect$

the $eed$ fro &!rd$(

,c)!ee"in:U"de$!r%&le *l%"t$ th%t #row %lo"# w!th the cro* %re '"ow" %$ weed$( 5eed!"# !$ the

*roce$$ of reo-!"# the$e weed$(XanthiumParthenium, etc( %re $oe coo" weed$( 5eed$

co*ete w!th the cro* for "+tr!e"t$ l!#ht %"d $*%ce( A$ % re$+lt cro* *l%"t$ #et le$$er "+tr!e"t$ l!#ht

%"d $*%ce for the!r de-elo*e"t( Th!$ !" t+r" red+ce$ the!r *rod+ct!-!t3( Th+$ -%r!o+$ weed!"#

ethod$ %re e*lo3ed(

Soe !*ort%"t weed!"# ethod$ %re:

,!) 5eed$ c%" &e co"trolled +$!"# weed!c!de$( It !$ % che!c%l wh!ch !$ $*r%3ed !" the f!eld$ to '!ll %ll

%-%!l%&le weed$( 5eed!c!de$ %re "ot h%rf+l to cro*$(

,!!) T!ll!"# &efore $ow!"# of cro*$ %l$o hel*$ !" reo-!"# weed$( T!ll!"# +*root$ the weed$( The &e$t

t!e for reo-%l of weed$ !$ &efore the3 *rod+ce flower$ %"d $eed$(

,!!!) The %"+%l ethod of reo-!"# weed$ !$ w!th the hel* of % khurpi( It !"-ol-e$ re#+l%r +*root!"#

or c+tt!"# of weed$ clo$e to the #ro+"d(

,d)T#res#in:Thre$h!"# !$ the *roce$$ of $e*%r%t!"# #r%!"$ or $eed$ fro ch%ff( It !$ do"e %fter

h%r-e$t!"# the cro*( It !$ +$+%ll3 c%rr!ed o+t w!th the hel* of % %ch!"e '"ow" %$ =Co&!"e>( Th!$

%ch!"e !$ % co&!"ed h%r-e$ter %"d thre$her( It h%r-e$t$ *l%"t$ %$ well %$ cle%"$ #r%!"$(

Q?) E6*l%!" how fert!l!$er$ %re d!ffere"t fro %"+re(

Differen$es %etween fertilisers an" &an're:

(ertiliser Man're

0ert!l!$er$ %re coerc!%ll3 %-%!l%&le *l%"t

"+tr!e"t$(

2%"+re !$ % "%t+r%l $+&$t%"ce *re*%red

&3 the deco*o$!t!o" of %"!%l e6cret%

%"d *l%"t w%$te$(

The3 c%" &e or#%"!c or !"or#%"!c !" "%t+re(

2%"+re !$ '"ow" to h%-e % l%r#e ;+%"t!t3

of or#%"!c %ter!%l$ %"d -er3 l!ttle

%o+"t of *l%"t "+tr!e"t$(

The3 e"$+re he%lth3 #rowth %"d de-elo*e"t

of *l%"t$ &3 *ro-!d!"# the w!th "!tro#e"

*ho$*hor+$ *ot%$$!+ etc(

The3 hel* !" e"r!ch!"# the $o!l w!th

or#%"!c %tter %"d "+tr!e"t$(

The %dd!t!o" of fert!l!$er$ to the $o!l re;+!re$

$*ec!%l #+!del!"e$ $+ch %$ do$e t!e *o$t

%dd!t!o" *rec%+t!o"$ etc( to &e followed(

The %dd!t!o" of %"+re doe$ "ot re;+!re

%"3 $*ec!%l #+!del!"e$(

A fert!l!$er doe$ "ot *ro-!de %"3 h++$ to the

$o!l(

2%"+re *ro-!de$ h++$ to the $o!l %"d

!"cre%$e$ $o!l fert!l!t3(

It$ e6ce$$!-e +$e c%+$e$ w%ter *oll+t!o"( It It *rotect$ the e"-!ro"e"t %"d hel*$ !"


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c%""ot re*le"!$h or#%"!c %tter of $o!l( rec3cl!"# f%r w%$te(

Q@) 5h%t !$ !rr!#%t!o" /e$cr!&e two ethod$ of !rr!#%t!o" wh!ch co"$er-e w%ter(

A"$) Irr!#%t!o" !$ the *roce$$ &3 wh!ch w%ter !$ $+**l!ed to cro*$ %t d!ffere"t !"ter-%l$( The t!e %"d

fre;+e"c3 of !rr!#%t!o" -%r!e$ %ccord!"# to d!ffere"t $e%$o"$ cro*$ %"d $o!l t3*e$( There %re -%r!o+$

$o+rce$ of !rr!#%t!o" $+ch %$ well$ c%"%l$ r!-er$ d%$ *o"d$ %"d l%'e$(

Two &et#o"s of irriation w#i$# #elp in $onser)ation of water are:

%) Sprin*ler s+ste&:

Th!$ $3$te !$ ore +$ef+l o" +"e-e" l%"d h%-!"# fewer w%ter $+**l!e$( I" th!$ ethod w%ter !$

$+**l!ed +$!"# *!*e$ to o"e or ore ce"tr%l loc%t!o"$ w!th!" the f!eld( 5he" w%ter !$ %llowed to flow

+"der h!#h *re$$+re w!th the hel* of % *+* !t #et$ $*r!"'led o" the cro*$(

&) Drip s+ste&:

I" th!$ $3$te w%ter !$ del!-ered %t or "e%r the root$ of *l%"t$ dro* &3 dro*( Th!$ !$ the o$t eff!c!e"t

ethod of !rr!#%t!o" %$ there !$ "o w%$t%#e of w%ter %t %ll( Th!$ ethod !$ !*ort%"t !" %re%$ where

w%ter %-%!l%&!l!t3 !$ *oor(

Q) If whe%t !$ $ow" !" the kharif $e%$o" wh%t wo+ld h%**e" /!$c+$$(

A"$: If whe%t !$ $ow" !" the kharif$e%$o" ,fro J+"e to Octo&er) the" the whole cro* !#ht #et

de$tro3ed &ec%+$e of %"3 f%ctor$ $+ch %$ l%c' of o*t!+ te*er%t+re %d%*t%&!l!t3 %-%!l%&!l!t3 of

*e$t$ etc(Kharif$e%$o" !"cl+de$ the r%!"3 $e%$o" wh!ch !$ "ot f%-o+r%&le for the #rowth of whe%t

cro*( Therefore whe%t cro* $ho+ld "ot &e $ow" d+r!"# th!$ $e%$o"(

Q8) If whe%t !$ $ow" !" the kharif $e%$o" wh%t wo+ld h%**e" /!$c+$$(

If whe%t !$ $ow" !" the kharif$e%$o" ,fro J+"e to Octo&er) the" the whole cro* !#ht #et de$tro3ed

&ec%+$e of %"3 f%ctor$ $+ch %$ l%c' of o*t!+ te*er%t+re %d%*t%&!l!t3 %-%!l%&!l!t3 of *e$t$ etc(

Kharif$e%$o" !"cl+de$ the r%!"3 $e%$o" wh!ch !$ "ot f%-o+r%&le for the #rowth of whe%t cro*(

Therefore whe%t cro* $ho+ld "ot &e $ow" d+r!"# th!$ $e%$o"(

Q) 5h%t %re weed$ How c%" we co"trol the

U"de$!r%&le *l%"t$ th%t #row %lo"# w!th cro* *l%"t$ %re '"ow" %$ weed$(XanthiumParthenium, etc(

%re $oe coo" weed$( 5eed$ co*ete w!th the cro* for "+tr!e"t$ l!#ht %"d $*%ce( A$ % re$+lt

cro* *l%"t$ #et le$$er "+tr!e"t$ l!#ht %"d $*%ce for the!r de-elo*e"t( Th!$ !" t+r" red+ce$ the!r

*rod+ct!-!t3( Th+$ -%r!o+$ weed!"# ethod$ %re e*lo3ed(

Soe !*ort%"t weed!"# ethod$ %re:

!( 5eed$ c%" &e co"trolled +$!"# weed!c!de$( It !$ % che!c%l wh!ch !$ $*r%3ed !" the f!eld$ to

'!ll %ll %-%!l%&le weed$( 5eed!c!de$ %re "ot h%rf+l to cro*$(

!!( T!ll!"# &efore $ow!"# of cro*$ %l$o hel*$ !" reo-!"# weed$( T!ll!"# +*root$ the weed$( The

&e$t t!e for the reo-%l of weed$ !$ &efore the3 *rod+ce flower$ %"d $eed$(iii. The %"+%l ethod of reo-!"# weed$ !$ w!th the hel* of % khurpi( It !"-ol-e$ re#+l%r

+*root!"# or c+tt!"# of weed$ clo$e to the #ro+"d(

Q1D) Arr%"#e the follow!"# &o6e$ !" *ro*er order to %'e % flow ch%rt of $+#%rc%"e cro* *rod+ct!o"(


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A"$: 0low ch%rt of $+#%rc%"e cro* *rod+ct!o":

Q11) Co*lete the follow!"# word *+44le w!th the hel* of cl+e$ #!-e" &elow(

/ow"

1( Pro-!d!"# w%ter to the cro*$(

( ee*!"# cro* #r%!"$ for % lo"# t!e +"der *ro*er co"d!t!o"$(

?( Cert%!" *l%"t$ of the $%e '!"d #row" o" % l%r#e $c%le(

Acro$$

7( A %ch!"e +$ed for c+tt!"# the %t+red cro*(

( A rabi cro* th%t !$ %l$o o"e of the *+l$e$(

@( A *roce$$ of $e*%r%t!"# the #r%!" fro ch%ff(

A"$: Down

1( IRRIATION

,-STORAE

.-CROP A$ross/-HARFESTOR0-RA2-5INNO5IN


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Q) T!c' the correct %"$wer:

A"$: %) Ge%$t !$ +$ed !" the *rod+ct!o" of

,I) S+#%r ,!!) %lcohol

,!!!) H3drochlor!c %c!d ,IF) o63#e"

,&) The follow!"# !$ %" %"t!&!ot!c

,!) $od!+ &!c%r&o"%te ,!!) $tre*to3c!"

,!!!) %lcohol ,!-) 3e%$t

,c) C%rr!er of %l%r!%


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,!!) ('ni The3 %re o$tl3 +lt!cell+l%r d!$e%$e


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,!) A"t!&!ot!c$ $ho+ld &e t%'e" +"der the $+*er-!$!o" of % well ;+%l!f!ed doctor(

,!!) Co+r$e ,!"t%'e) of %"t!&!ot!c$ $ho+ld &e co*leted %$ *er the *re$cr!*t!o" #!-e" &3 the doctor(

,!!!) A"t!&!ot!c$ $ho+ld &e t%'e" !" the r!#ht %o+"t %"d %t the r!#ht t!e( A wro"# do$e of %"t!&!ot!c$

%'e$ the dr+# !"effect!-e( Al$o e6ce$$!-e co"$+*t!o" of dr+#$ %3 '!ll the +$ef+l &%cter!% *re$e"t

!" o+r &od3(


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E6*l%!" the d!ffere"ce &etwee" thero*l%$t!c %"d thero$ett!"# *l%$t!c$(

A"$: There %re two t3*e$ of *l%$t!c$: Thero$ett!"# *l%$t!c$ %"d Thero*l%$t!c$(

Thero$ett!"# *l%$t!c Thero*l%$t!c

Thero$ett!"# *l%$t!c c%""ot &e &e"t e%$!l3( It %3

&re%' whe" forced to &e"d(Thero*l%$t!c c%" &e &e"t e%$!l3(

Thero$ett!"# *l%$t!c c%""ot &e $ofte"ed &3 he%t!"#(

Th+$ !t c%""ot &e re$h%*ed o"ce o+lded(

Thero*l%$t!c c%" &e $ofte"ed e%$!l3 &3

he%t!"#( Th+$ !t c%" &e re$h%*ed(

Q) E6*l%!" wh3 the follow!"# %re %de of thero$ett!"# *l%$t!c$(

,%) S%+ce*%" h%"dle$

,&) Electr!c *l+#$$w!tche$*l+# &o%rd$

A"$: ,%) S%+ce*%" h%"dle$ %re %de of thero$ett!"# *l%$t!c$ &ec%+$e the$e *l%$t!c$ do "ot #et

$ofte"ed o" he%t!"#( Al$o thero$ett!"# *l%$t!c$ $+ch %$ &%'el!te %re *oor co"d+ctor$ of he%t(

,&) Thero$ett!"# *l%$t!c$ $+ch %$ &%'el!te %re *oor co"d+ctor$ of he%t %"d electr!c!t3( Therefore the3

%re +$ed for %'!"# electr!c *l+#$ $w!tche$ *l+# &o%rd$ etc(

Q8) C%te#or!4e the %ter!%l$ of the follow!"# *rod+ct$ !"to =c%" &e rec3cled> %"d =c%""ot &e

rec3cled>(

Tele*ho"e !"$tr+e"t$ *l%$t!c to3$ coo'er h%"dle$ c%rr3 &%#$ &%ll *o!"t *e"$ *l%$t!c &owl$ *l%$t!c

co-er!"# o" electr!c%l w!re$ *l%$t!c ch%!r$ electr!c%l $w!tche$(

A"$:

Cannot %e re$+$le" Can %e re$+$le"

Tele*ho"e !"$tr+e"t$ Pl%$t!c to3$

Coo'er h%"dle$ Pl%$t!c ch%!r$

Electr!c%l $w!tche$ C%rr3 &%#$

Pl%$t!c co-er!"# o" electr!c%l w!re$

B%ll *o!"t *e"$

Pl%$t!c &owl$

Q) R%"% w%"t$ to &+3 $h!rt$ for $+er( Sho+ld he &+3 cotto" $h!rt$ or $h!rt$ %de fro $3"thet!c

%ter!%l Ad-!$e R%"% #!-!"# 3o+r re%$o"(

A"$: R%"% $ho+ld &+3 $h!rt$ %de fro cotto"( Th!$ !$ &ec%+$e cotto" !$ % #ood %&$or&er of w%ter( It

c%" $o%' the $we%t co!"# o+t of o+r &od3 %"d e6*o$e !t to the e"-!ro"e"t( Th+$ !t hel*$ !"

e-%*or%t!"# the l!;+!d ,$we%t) there&3 cool!"# o+r &od3(

Q1D) !-e e6%*le$ to $how th%t *l%$t!c$ %re "o"


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A"$: Pl%$t!c$ %re "ot corroded e-e" !f the3 coe !" co"t%ct w!th $tro"# che!c%l$( Th!$ !$ &ec%+$e of

the!r "o"


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444444444444444444444444444444444444444444444444444444444444444444444444444444444444444444444444444444444444444444444444444

CHAPTER: 0 Materials: Metal an" Non4Metals

Q1) 5h!ch of the follow!"# c%" &e &e%te" !"to th!" $heet$

,%) K!"c ,&) Pho$*hor+$ ,c) S+l*h+r ,d) O63#e"

A"$: K!"c

Q) 5h!ch of the follow!"# $t%tee"t$ !$ correct

,%) All et%l$ %re d+ct!le(

,&) All "o"


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Properties Metals Non4&etals

1( A**e%r%"ce

( H%rd"e$$

7( 2%lle%&!l!t3

( /+ct!l!t3

?( He%t Co"d+ct!o"

@( Co"d+ct!o" of Electr!c!t3

A"$:

Properties Metals Non4&etals

1( A**e%r%"ce

( H%rd"e$$

7( 2%lle%&!l!t3

( /+ct!l!t3

?( He%t co"d+ct!o"

@( Co"d+ct!o" of electr!c!t3

L+$tro+$

H%rd

C%" &e &e%te" !"to th!" $heet$

C%" &e dr%w" !"to w!re$

ood co"d+ctor$ of he%t

ood co"d+ctor$ of electr!c!t3

/+ll

Soft

C%""ot &e &e%te" !"to th!" $heet$

C%""ot &e dr%w" !"to w!re$

Poor co"d+ctor$ of he%t

Poor co"d+ctor$ of electr!c!t3

Q@) !-e re%$o"$ for the follow!"#(

,%) Al+!"!+ fo!l$ %re +$ed to wr%* food !te$(

,&) Ier$!o" rod$ for he%t!"# l!;+!d$ %re %de +* of et%ll!c $+&$t%"ce$(

,c) Co**er c%""ot d!$*l%ce 4!"c fro !t$ $%lt $ol+t!o"(

,d) Sod!+ %"d *ot%$$!+ %re $tored !" 'ero$e"e(

A"$: ,%) Al+!"!+ fo!l$ %re +$ed to wr%* food !te$ &ec%+$e %l+!"!+ et%l !$ %lle%&le(

Therefore !t c%" &e &e%te" !"to th!" fo!l$(

,&) 2et%l$ %re #ood co"d+ctor$ of he%t %"d electr!c!t3( Therefore !er$!o" rod$ for he%t!"# l!;+!d$

%re %de of et%ll!c $+&$t%"ce$(

,c) A et%l c%" d!$*l%ce % le$$ re%ct!-e et%l fro !t$ $%lt !" %" %;+eo+$ $ol+t!o"( B+t 4!"c !$ ore

re%ct!-e th%" co**er( Therefore co**er c%""ot d!$*l%ce 4!"c fro !t$ $%lt $ol+t!o"(

C+,s) K"SO ,a!)9 No re%ct!o"

,d) Sod!+ %"d *ot%$$!+ %re $tored !" 'ero$e"e &ec%+$e the3 %re h!#hl3 re%ct!-e elee"t$( The3 c%"

e%$!l3 c%tch f!re e-e" whe" !" co"t%ct w!th %!r(

Q) C%" 3o+ $tore leo" *!c'le !" %" %l+!"!+ +te"$!l E6*l%!"(

A"$: Leo" *!c'le c%""ot &e $tored !" %l+!"!+ +te"$!l$ &ec%+$e leo" *!c'le co"t%!"$ %c!d$ wh!ch

c%" re%ct w!th %l+!"!+ ,et%l) l!&er%t!"# h3dro#e" #%$( Th!$ c%" le%d to the $*o!l!"# of the *!c'le(

Q8) 2%tch the $+&$t%"ce$ #!-e" !" Col+" A w!th the!r +$e$ #!-e" !" Col+" B(

A B

,!) old ,%) Theroeter$


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,!!) Iro" ,&) Electr!c w!re

,!!!) Al+!"!+ ,c) 5r%**!"# food

,!-) C%r&o" ,d) Jeweller3

,-) Co**er ,e) 2%ch!"er3

,-!) 2erc+r3 ,f) 0+elA"$:

A B

,!) old ,d) Jeweller3

,!!) Iro" ,e) 2%ch!"er3

,!!!) Al+!"!+ ,c) 5r%**!"# food

,!-) C%r&o" ,f) 0+el

,-) Co**er ,&) Electr!c w!re

,-!) 2erc+r3 ,%) Theroeter$

Q) 5h%t h%**e"$ whe"

,%) /!l+te $+l*h+r!c %c!d !$ *o+red o" % co**er *l%te

,&) Iro" "%!l$ %re *l%ced !" co**er $+l*h%te $ol+t!o"5r!te word e;+%t!o"$ of the re%ct!o"$ !"-ol-ed(

A"$: ,%) 5he" d!l+te $+l*h+r!c %c!d !$ *o+red o" % co**er *l%te the co**er et%l re%ct$ w!th $+l*h+r!c

%c!d to l!&er%te h3dro#e" #%$(

,&) Iro" &e!"# ore re%ct!-e d!$*l%ce$ co**er fro co**er $+l*h%te $ol+t!o"( I" th!$ re%ct!o" the &l+e

colo+r of co**er $+l*h%te f%de$ %"d there !$ de*o$!t!o" of co**er o" the !ro" "%!l(

Q1D) S%lo"! too' % *!ece of &+r"!"# ch%rco%l %"d collected the #%$ e-ol-ed !" % te$t t+&e(

,%) How w!ll $he f!"d the "%t+re of the #%$

,&) 5r!te dow" word e;+%t!o"$ of %ll the re%ct!o"$ t%'!"# *l%ce !" th!$ *roce$$(

A"$: ,%) Add % few dro*$ of w%ter !" the te$t t+&e co"t%!"!"# #%$( Now co-er the te$t t+&e %"d $h%'e !t

well( After $h%'!"# te$t the $ol+t!o" w!th &l+e l!t+$ %"d red l!t+$( It w!ll t+r" &l+e l!t+$ red( Th+$

the #%$ !$ %c!d!c !" "%t+re(

,&) Ch%rco%l re%ct$ w!th o63#e" to for c%r&o" d!o6!de #%$(


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C%r&o" d!o6!de re%ct$ w!th w%ter to for c%r&o"!c %c!d wh!ch t+r"$ &l+e l!t+$ *%*er red(

Q11) O"e d%3 Reet% we"t to % eweller>$ $ho* w!th her other( Her other #%-e %" old #old eweller3

to the #old$!th to *ol!$h( Ne6t d%3 whe" the3 &ro+#ht the eweller3 &%c' the3 fo+"d th%t there w%$ %

$l!#ht lo$$ !" !t$ we!#ht( C%" 3o+ $+##e$t % re%$o" for the lo$$ !" we!#ht

A"$: To *ol!$h % #old or"%e"t !t !$ d!**ed !" % l!;+!d c%lled %;+%re#!% ,% !6t+re of h3drochlor!c

%c!d %"d "!tr!c %c!d)( O" #ett!"# the e"-!ro"e"t of %;+%re#!% the o+ter l%3er of #old d!$$ol-e$ %"d the

!""er $h!"3 l%3er %**e%r$( The d!$$ol-!"# of the l%3er c%+$e$ % red+ct!o" !" the we!#ht of the eweller3(

CHAPTER: . Coal an" Petrole'&

Q1)5h%t %re the %d-%"t%#e$ of +$!"# CN %"d LP %$ f+el$

A"$: The %d-%"t%#e$ of +$!"# co*re$$ed "%t+r%l #%$ ,CN) %"d l!;+!f!ed *etrole+ #%$ ,LP) %$

f+el$ %re:

,!) The3 c%" &e &+r"t d!rectl3(

,!!) The3 c%" &e tr%"$*orted e%$!l3 thro+#h *!*e l!"e$(

,!!!) The3 %re cle%" f+el$ %"d do "ot #!-e $o'e whe" &+r"t(

,!-) The3 #!-e % lot of he%t e"er#3 whe" &+r"t(

Q) N%e the *etrole+ *rod+ct +$ed for $+rf%c!"# of ro%d$(

A"$: B!t+e" % *etrole+ *rod+ct !$ +$ed for $+rf%c!"# ro%d$(

Q7) /e$cr!&e how co%l !$ fored fro de%d -e#et%t!o"( 5h%t !$ th!$ *roce$$ c%lled

A"$: 2!ll!o"$ of 3e%r$ %#o de"$e fore$t$ #ot &+r!ed +"der the $o!l d+e to "%t+r%l *roce$$e$ l!'e $tor$

flood$ %"d e%rth;+%'e$( The$e #ot co*re$$ed %$ ore %"d ore $o!l #ot de*o$!ted o-er the( 5he"the3 #ot &+r!ed dee* !" the $o!l the3 were e6*o$ed to -er3 h!#h *re$$+re %"d te*er%t+re( U"der the$e

co"d!t!o"$ the$e $lowl3 #ot co"-erted !"to co%l( Th!$ *roce$$ of for%t!o" of co%l fro de%d

-e#et%t!o" !$ c%lled c%r&o"!4%t!o"(

Q) 0!ll !" the &%"'$(

,%) 0o$$!l f+el$ %re ........ ........ %"d .........(

,&) Proce$$ of $e*%r%t!o" of d!ffere"t co"$t!t+e"t$ fro *etrole+ !$ c%lled .........(

,c) Le%$t *oll+t!"# f+el for -eh!cle$ !$ ..........(

A"$: ,%) 0o$$!l f+el$ %re ..co%l.. ..*etrole+.. %"d .."%t+r%l #%$..(

,&) Proce$$ of $e*%r%t!o" of d!ffere"t co"$t!t+e"t$ fro *etrole+ !$ c%lled ..ref!"!"#..(

,c) Le%$t *oll+t!"# f+el for -eh!cle$ !$ ..co*re$$ed "%t+r%l #%$ ,CN)..(


14/59

Q?) T!c' Tr+e0%l$e %#%!"$t the follow!"# $t%tee"t$(

,%) 0o$$!l f+el$ c%" &e %de !" the l%&or%tor3( ,T 0)

,&) CN !$ ore *oll+t!"# f+el th%" *etrol( ,T 0)

,c) Co'e !$ %lo$t *+re for of c%r&o"( ,T 0)

,d) Co%l t%r !$ % !6t+re of -%r!o+$ $+&$t%"ce$( ,T 0)

,e) ero$e"e !$ "ot % fo$$!l f+el( ,T 0)

A"$: ,%) 0o$$!l f+el$ c%" &e %de !" the l%&or%tor3( ,0)

,&) CN !$ ore *oll+t!"# f+el th%" *etrol( ,0)

,c) Co'e !$ %lo$t *+re for of c%r&o"( ,T)

,d) Co%l t%r !$ % !6t+re of -%r!o+$ $+&$t%"ce$( ,T)

,e) ero$e"e !$ "ot % fo$$!l f+el( ,0)

Q@) E6*l%!" wh3 fo$$!l f+el$ %re e6h%+$t!&le "%t+r%l re$o+rce$(

A"$: 0o$$!l f+el$ re;+!re !ll!o"$ of 3e%r$ to for fro the de%d -e#et%t!o" %"d %"!%l$ th%t #et

&+r!ed dee* !"$!de the E%rth( The3 re;+!re h!#h te*er%t+re %"d *re$$+re for the!r for%t!o" wh!ch

c%""ot &e *ro-!ded !" the l%&or%tor3( Th+$ fo$$!l$ %re l!!ted( Therefore the +$e of fo$$!l f+el$ %t th!$

r%te w!ll le%d to the!r e6h%+$t!o"(

Q) /e$cr!&e ch%r%cter!$t!c$ %"d +$e$ of co'e(

A"$: Ch%r%cter!$t!c$ of co'e %re:

,!) To+#h

,!!) Poro+$,!!!) Bl%c' !" colo+r

U$e$ of co'e:

,!) I" %"+f%ct+re of $teel(

,!!) I" the e6tr%ct!o" of et%l$ ,%$ % red+c!"# %#e"t)(

Q8) E6*l%!" the *roce$$ of for%t!o" of *etrole+(

A"$: Petrole+ w%$ fored fro de%d or#%"!$$ th%t #ot &+r!ed !" the $e% !ll!o"$ of 3e%r$ %#o(

The$e de%d &od!e$ #ot co-ered w!th l%3er$ of $%"d %"d cl%3( L%c' of %!r h!#h te*er%t+re %"d h!#h

*re$$+re tr%"$fored the$e de%d or#%"!$$ !"to *etrole+ %"d "%t+r%l #%$(


15/59

,%) B+r"!"# of wood %"d co%l c%+$e$ ....... .. of %!r(

,&) A l!;+!d f+el +$ed !" hoe$ !$ ...........(

,c) 0+el +$t &e he%ted to !t$ ........... &efore !t $t%rt$ &+r"!"#(

,d) 0!re *rod+ced &3 o!l c%""ot &e co"trolled &3 ........ .(

A"$: ,%) B+r"!"# of wood %"d co%l c%+$e$ ..*oll+t!o".. of %!r(

,&) A l!;+!d f+el +$ed !" hoe$ !$ ..l!;+ef!ed *etrole+ #%$ ,LP).(

,c) 0+el +$t &e he%ted to !t$ ..!#"!t!o" te*er%t+re.. &efore !t $t%rt$ &+r"!"#(

,d) 0!re *rod+ced &3 o!l c%""ot &e co"trolled &3 ..w%ter..(

Q7) E6*l%!" how the +$e of CN !" %+too&!le$ h%$ red+ced *oll+t!o" !" o+r c!t!e$(

A"$: Co&+$t!o" of f+el$ l!'e *etrole+ c%+$e$ for%t!o" of +"


16/59

A"$:

Q) N%e the +"!t !" wh!ch the c%lor!f!c -%l+e of % f+el !$ e6*re$$ed(

A"$: The c%lor!f!c -%l+e of % f+el !$ e6*re$$ed !" '!loo+le$ *er '!lo#r% ,'J'#)(

Q8) E6*l%!" how CO!$ %&le to co"trol f!re$(

A"$: CO!$ % "o"


17/59

A"$: The w%ter !" the R%e$h>$ &e%'er w!ll he%t +* !" % $horter t!e( Th!$ !$ &ec%+$e the o+tero$t

4o"e of % fl%e !$ the hotte$t 4o"e wh!le the 3ellow 4o"e ,!" wh!ch A&!d% h%d 'e*t the &e%'er) !$ le$$

hot(


18/59

It !$ % *o*+l%t!o" of $*ec!e$ th%t !$ o" the

-er#e of &eco!"# e6t!"ct(

It !$ % *o*+l%t!o" of $*ec!e$ th%t "o lo"#er

e6!$t$( He"ce !t !$ e6t!"ct(

Bl+e wh%le t!#er leo*%rd etc( %re e6%*le$

of e"d%"#ered $*ec!e$(

/odo *%$$e"#er *!#eo" etc( %re e6%*le$ of

e6t!"ct $*ec!e$(

A"$: ,d)

0lor% 0%+"%

It refer$ to %ll l!-!"# *l%"t$ !" % *%rt!c+l%r

%re%(It refer$ to %ll %"!%l$ l!-!"# !" % *%rt!c+l%r %re%(

S%l te%' %"#o etc( for the flor% of

P%ch%rh! &!o$*here re$er-e(

Leo*%rd wolf w!ld do# etc( for the f%+"% of

P%ch%rh! &!o$*here re$er-e(

Q7) /!$c+$$ the effect$ of defore$t%t!o" o" the follow!"#(

,%) 5!ld %"!%l$

,&) E"-!ro"e"t

,c) F!ll%#e$ ,R+r%l %re%$)

,d) C!t!e$ ,Ur&%" %re%$)

,e) E%rth

,f) The "e6t #e"er%t!o"

A"$: ,%) Effect$ of defore$t%t!o" o" w!ld %"!%l$:

/efore$t%t!o" !$ the reo-%l of tree$ or other -e#et%t!o" fro %" %re% for !"d+$tr!%l %#r!c+lt+r%l or

other *+r*o$e$( Tree$ %"d other -e#et%t!o" for the h%&!t%t of %"3 %"!%l$( He"ce !f the h%&!t%t of

w!ld %"!%l$ !$ de$tro3ed the" the!r "+&er$ wo+ld %+to%t!c%ll3 decl!"e(

,&) Effe$ts of "eforestation on t#e en)iron&ent:

A"$:Pl%"t$ %&$or& COfro the %to$*here to *erfor *hoto$3"the$!$( If *l%"t$ %re de$tro3ed the"

the le-el of CO!" the %to$*here w!ll r!$e( A$ % re$+lt COw!ll tr%* ore he%t r%d!%t!o"$ there&3

%dd!"# to #lo&%l w%r!"#( A" !"cre%$e !" the te*er%t+re of the E%rth w!ll d!$t+r& the "%t+r%l w%ter

c3cle( A$ % re$+lt there w!ll &e % ch%"#e !" the r%!"f%ll *%tter"( Th!$ co+ld le%d to flood$ or dro+#ht$(

,c) Effe$ts of "eforestation on )illaes:

A"$:Root$ of *l%"t$ hold $o!l *%rt!cle$ to#ether( I" the %&$e"ce of *l%"t$ the to* l%3er of the $o!l w!ll

&e e%$!l3 reo-ed &3 the %ct!o" of h!#h $*eed w!"d$ or w%ter flow( Th+$ defore$t%t!o" !"cre%$e$ the

ch%"ce$ of $o!l ero$!o"( A$ % re$+lt $o!l lo$e$ h++$ %"d &ecoe le$$ fert!le( He"ce % fert!le l%"d

wh!ch !$ % $o+rce of l!-!"# for f%rer$ !" -!ll%#e$ #et$ co"-erted !"to % de$ert(

,d) Effe$ts of "eforestation on $ities:

A"$:/efore$t%t!o" !" c!t!e$ c%" !"cre%$e the r!$' of %"3 "%t+r%l c%l%!t!e$ $+ch %$ flood$ %"d

dro+#ht$ !" th%t %re%( Al$o !t c%" le%d to #lo&%l w%r!"# d+e to %" !"cre%$e !" the le-el of CO !" the


19/59

%to$*here %$ % re$+lt of -eh!c+l%r %"d !"d+$tr!%l *oll+t!o"( Th!$ !"cre%$e !" te*er%t+re c%" d!$t+r&

the "%t+r%l w%ter c3cle of %" %re%

,e) Effe$ts of "eforestation on t#e Eart#:

A"$:A$ % re$+lt of defore$t%t!o" ch%"ce$ of de$ert!f!c%t!o" dro+#ht$ flood$ etc( !"cre%$e(

/efore$t%t!o" c%" %l$o !"cre%$e the le-el of CO!" the E%rth( It w!ll le%d to %" !"cre%$e !" te*er%t+re

!(e( #lo&%l w%r!"#( A$ % re$+lt the e"t!re "%t+r%l w%ter c3cle w!ll #et d!$r+*ted( Th!$ %#%!" !"cre%$e$

the r!$' of "%t+r%l c%l%!t!e$(

,f) Effe$ts of "eforestation on t#e net eneration:

A"$:/efore$t%t!o" !$ $lowl3 ch%"#!"# o+r e"-!ro"e"t%l co"d!t!o"$( It !$ re$*o"$!&le for #lo&%l

w%r!"# $o!l ero$!o" #ree"ho+$e effect dro+#ht flood$ %"d %"3 other #lo&%l *ro&le$( A$ %

re$+lt the "e6t #e"er%t!o" w!ll h%-e to f%ce $e-ere co"$e;+e"ce$ of defore$t%t!o"(

Q) 5h%t w!ll h%**e" !f:

,%) we #o o" c+tt!"# tree$(

,&) the h%&!t%t of %" %"!%l !$ d!$t+r&ed(

,c) the to* l%3er of $o!l !$ e6*o$ed(

A"$: ,%) If we #o o" c+tt!"# tree$ the "%t+r%l h%&!t%t of %"3 %"!%l$ w!ll #et co*letel3 de$tro3ed(

A$ % re$+lt the &!od!-er$!t3 of %"3 %re%$ w!ll &e $e-erel3 %ffected( Al$o there w!ll &e %" !"cre%$e !"

the te*er%t+re of the E%rth %$ % re$+lt of #lo&%l w%r!"# wh!ch c%" d!$t+r& the "%t+r%l w%ter c3cle(

A$ % re$+lt there w!ll &e % ch%"#e !" the r%!"f%ll *%tter"( Th!$ co+ld le%d to flood$ or dro+#ht$( Th!$

w!ll %l$o !"cre%$e the r!$' of $o!l ero$!o" de$ert!f!c%t!o" %"d "%t+r%l c%l%!t!e$(A"$: ,&) The h%&!t%t of %" %"!%l *ro-!de$ !t w!th "ece$$!t!e$ $+ch %$ $helter food %"d *rotect!o"( If

the h%&!t%t of %" %"!%l !$ d!$t+r&ed the" !t w!ll &e forced to #o to other *l%ce$ !" $e%rch of food %"d

$helter( The %"!%l co+ld #et '!lled &3 other %"!%l$ !" th!$ *roce$$(

A"$: ,c) If the to* l%3er of $o!l !$ e6*o$ed the" !t w!ll #r%d+%ll3 e6*o$e the lower l%3er of $o!l wh!ch

!$ h%rd %"d roc'3 !" "%t+re( Th!$ t3*e of $o!l !$ le$$ fert!le %$ !t co"t%!"$ le$$ h++$( Co"t!"+ed $o!l

ero$!o" w!ll %'e the l%"d &%rre" or !"fert!le(

Q?) A"$wer !" &r!ef:

,%) 5h3 $ho+ld we co"$er-e &!od!-er$!t3

,&) Protected fore$t$ %re %l$o "ot co*letel3 $%fe for w!ld %"!%l$( 5h3

,c) Soe tr!&%l$ de*e"d o" the +"#le( How

,d) 5h%t %re the c%+$e$ %"d co"$e;+e"ce$ of defore$t%t!o"

,e) 5h%t !$ Red /%t% Boo'

,f) 5h%t do 3o+ +"der$t%"d &3 the ter !#r%t!o"

A"$: ,%) B!od!-er$!t3 refer$ to the "+&er %"d -%r!et3 of -%r!o+$ l!fe for$ $+ch %$ *l%"t$ %"!%l$

%"d !cro


20/59


21/59

%l$o %$' the to w%ter the *l%"t$ d%!l3 wh!ch w!ll t%'e -er3 l!ttle of the!r t!e( I &el!e-e *l%"t!"# "ew

tree$ !$ %$ !*ort%"t %$ t%'!"# c%re of the e6!$t!"# tree$(

Q8) E6*l%!" how defore$t%t!o" le%d$ to red+ced r%!"f%ll(

A"$: /efore$t%t!o" !$ the reo-%l of tree$ or other -e#et%t!o" fro %" %re% for !"d+$tr!%l %#r!c+lt+r%l

or other *+r*o$e$( Pl%"t$ or tree$ %&$or& COfro the %to$*here( If *l%"t$ %re de$tro3ed the" the

le-el of CO!" the %to$*here w!ll r!$e( The h!#h le-el$ of CO !" the %to$*here w!ll tr%* ore he%t

r%d!%t!o"$ le%d!"# to #lo&%l w%r!"#( Th!$ !"cre%$e !" te*er%t+re of the E%rth w!ll d!$t+r& the "%t+r%l

w%ter c3cle( A$ % re$+lt of d!$r+*t!o" !" the w%ter c3cle there w!ll &e % ch%"#e !" the r%!"f%ll *%tter"(

The red+ced %o+"t of r%!"w%ter c%" c%+$e dro+#ht$(

Q) 5h3 $ho+ld *%*er &e $%-ed Pre*%re % l!$t of w%3$ &3 wh!ch 3o+ c%" $%-e *%*er(

A"$: P%*er $ho+ld &e $%-ed &ec%+$e !t t%'e$ %ro+"d $e-e"tee" f+ll #row" tree$ to %'e o"e to""e of

*%*er( Tree$ %$ we '"ow %re !*ort%"t to %!"t%!" % &%l%"ce of "%t+re( Therefore !" order to $%-e

tree$ %"d *re-e"t the !*%ct of the!r lo$$ o" l!-!"# or#%"!$$ we "eed to $%-e *%*er(

!a+s %+ w#i$# paper $an %e sa)e":

,!) Collect +$ed *%*er %"d rec3cle !t(

,!!) U$e &oth $!de$ of % *%*er for wr!t!"#(

,!!!) S*re%d %w%re"e$$ %&o+t the !*ort%"ce of *%*er(

,!-) U$e *%*er !"tell!#e"tl3(


22/59

A"$:

The f+"ct!o" of % "er-e cell !$ to tr%"$!t e$$%#e$ to the &r%!" %"d %l$o to t%'e %w%3 e$$%#e$ fro

the &r%!" to the rece*tor or#%"$( Th+$ !t co"trol$ the wor'!"# of d!ffere"t *%rt$ of the &od3(

Q7) 5r!te $hort "ote$ o" the follow!"#(

,%) C3to*l%$

,&) N+cle+$ of % cell

A"$: ,%) C+toplas&:

It !$ % fl+!d th%t f!ll$ the cell %"d occ+r$ &etwee" the *l%$% e&r%"e %"d the "+cle+$( Cell

or#%"elle$ $+ch %$ !tocho"dr!% r!&o$oe$ ol#! &od!e$ etc( %re $+$*e"ded !" the c3to*l%$( The

c3to*l%$ hel*$ !" the e6ch%"#e of %ter!%l$ &etwee" cell or#%"elle$(

A"$: ,&) N'$le's of a $ell:

The "+cle+$ !$ % $*her!c%l $tr+ct+re #e"er%ll3 *re$e"t %t the ce"tre of % cell( The "+cle+$ !$ co*o$ed

of the follow!"# co*o"e"t$:

,!) N'$lear &e&%rane:

It !$ % do+&le


23/59

A"$: C3to*l%$ !$ the *%rt of the cell th%t co"t%!"$ -%r!o+$ or#%"elle$ $+ch %$ !tocho"dr!%

r!&o$oe$ ol#! &od!e$ etc( C3to*l%$ !$ % fl+!d th%t f!ll$ the cell %"d occ+r$ &etwee" the *l%$%

e&r%"e %"d the "+cle+$(

Q?) St%te the d!ffere"ce &etwee" e+'%r3ote$ %"d *ro'%r3ote$(

A"$:

Q) 5here %re chroo$oe$ fo+"d !" % cell St%te the!r f+"ct!o"(

A"$: The "+cle+$ co"t%!"$ thre%d


24/59

Q1D) Co*lete the cro$$word w!th the hel* of cl+e$ #!-e" &elow(

Acro$$

1( Th!$ !$ "ece$$%r3 for *hoto$3"the$!$(

7( Ter for co*o"e"t *re$e"t !" the c3to*l%$(

@( The l!-!"# $+&$t%"ce !" the cell(

8( U"!t$ of !"her!t%"ce *re$e"t o" the chroo$oe$(

/ow"

1( ree" *l%$t!d$(

( 0ored &3 collect!o" of t!$$+e$(

( It $e*%r%te$ the co"te"t$ of the cell fro the $+rro+"d!"# ed!+(

?( E*t3 $tr+ct+re !" the c3to*l%$(

( A #ro+* of cell$(

A"$: Acro$$

1( CHLOROPHGLL

7( ORANELLE

@( PROTOPLAS2

8( ENES

/ow"

1( CHLOROPLASTS( ORAN( 2E2BRANE?( FACUOLE( TISSUE


25/59

A"$: Re*rod+ct!o" !$ % &!olo#!c%l *roce$$ thro+#h wh!ch l!-!"# or#%"!$$ *rod+ce off$*r!"# $!!l%r to

the$el-e$( L!-!"# or#%"!$$ re*rod+ce to %!"t%!" the!r "+&er %"d for the co"t!"+%t!o" of the!r

$*ec!e$( Th+$ re*rod+ct!o" e"$+re$ the co"t!"+%t!o" of $!!l%r '!"d$ of !"d!-!d+%l$(

Q) /e$cr!&e the *roce$$ of fert!l!4%t!o" !" h+%" &e!"#$(

A"$: 0ert!l!4%t!o" !"-ol-e$ the f+$!o" of the %le %"d the fe%le #%ete( The %le %"d the fe%le

#%ete$ %re rele%$ed fro the %le %"d the fe%le re*rod+ct!-e or#%"$( S*er$ or %le #%ete$ %re

rele%$ed fro the %le re*rod+ct!-e or#%" !(e( the *e"!$( The$e $*er$ the" e"ter the fe%le &od3

thro+#h the -%#!"%( The" the3 tr%-el thro+#h the f%llo*!%" t+&e$ where the3 eet the e##$( He"ce the

*roce$$ of fert!l!4%t!o" t%'e$ *l%ce !" the f%llo*!%" t+&e$(

/+r!"# fert!l!4%t!o" the h%*lo!d "+cle+$ of the $*er %"d th%t of the o-+ f+$e w!th e%ch other to

for the 43#ote( Th!$ 43#ote d!-!de$ to for %" e&r3o wh!ch !" t+r" de-elo*$ !"to % foet+$(

Q7) Choo$e the o$t %**ro*r!%te %"$wer(

A"$: ,%) I"ter"%l fert!l!4%t!o" occ+r$

,!) !" fe%le &od3(

,!!) o+t$!de fe%le &od3(

,!!!) !" %le &od3(

,!-) o+t$!de %le &od3(

,&) A t%d*ole de-elo*$ !"to %" %d+lt fro# &3 the *roce$$ of

,!) fert!l!4%t!o"

,!!) et%or*ho$!$

,!!!) e&edd!"#

,!-) &+dd!"#

,c) The "+&er of "+cle! *re$e"t !" % 43#ote !$

,!) "o"e

,!!) o"e

,!!!) two

,!-) fo+rA"$: ,%) ,!) I"ter"%l fert!l!4%t!o" occ+r$ !" the fe%le &od3(

,&) ,!!) A t%d*ole de-elo*$ !"to %" %d+lt fro# &3 the *roce$$ of et%or*ho$!$(

,c) ,!!) The "+&er of "+cle! *re$e"t !" % 43#ote !$ o"e(


26/59

Q) I"d!c%te whether the follow!"# $t%tee"t$ %re Tr+e ,T) or 0%l$e ,0)(

,%) O-!*%ro+$ %"!%l$ #!-e &!rth to 3o+"# o"e$( , )

,&) E%ch $*er !$ % $!"#le cell( , )

,c) E6ter"%l fert!l!4%t!o" t%'e$ *l%ce !" fro#$( , )

,d) A "ew h+%" !"d!-!d+%l de-elo*$ fro % cell c%lled #%ete( , )

,e) E## l%!d %fter fert!l!4%t!o" !$ %de +* of % $!"#le cell( , )

,f)Amoebare*rod+ce$ &3 &+dd!"#( , )

,#) 0ert!l!4%t!o" !$ "ece$$%r3 e-e" !" %$e6+%l re*rod+ct!o"( , )

,h) B!"%r3 f!$$!o" !$ % ethod of %$e6+%l re*rod+ct!o"( , )

,!) A 43#ote !$ fored %$ % re$+lt of fert!l!4%t!o"( , )

,) A" e&r3o !$ %de +* of % $!"#le cell( , )

A"$: ,%) O-!*%ro+$ %"!%l$ #!-e &!rth to 3o+"# o"e$( ,0)

,&) E%ch $*er !$ % $!"#le cell( ,T)

,c) E6ter"%l fert!l!4%t!o" t%'e$ *l%ce !" fro#$( ,T)

,d) A "ew h+%" !"d!-!d+%l de-elo*$ fro % cell c%lled #%ete( ,0)

,e) E## l%!d %fter fert!l!4%t!o" !$ %de +* of % $!"#le cell( ,T)

,f)Amoebare*rod+ce$ &3 &+dd!"#( ,0)

,#) 0ert!l!4%t!o" !$ "ece$$%r3 e-e" !" %$e6+%l re*rod+ct!o"( ,0)

,h) B!"%r3 f!$$!o" !$ % ethod of %$e6+%l re*rod+ct!o"( ,T)

,!) A 43#ote !$ fored %$ % re$+lt of fert!l!4%t!o"( ,T)

,) A" e&r3o !$ %de +* of % $!"#le cell( ,0)Q?) !-e two d!ffere"ce$ &etwee" % 43#ote %"d % foet+$(

A"$:

=+ote (oet's

It !$ % fert!l!4ed e## fored %fter the

f+$!o" of the $*er w!th the e##(

It !$ % $t%#e of the e&r3o th%t $how$ %ll the %!"

reco#"!4%&le &od3 *%rt$ of % %t+re or#%"!$(

The 43#ote d!-!de$ $e-er%l t!e$ to for

%" e&r3o(

A" e&r3o #r%d+%ll3 de-elo*$ !"to % foet+$(

Q@) /ef!"e %$e6+%l re*rod+ct!o"( /e$cr!&e two ethod$ of %$e6+%l re*rod+ct!o" !" %"!%l$(

A"$: A$e6+%l re*rod+ct!o" !$ % ode of re*rod+ct!o" th%t doe$ "ot !"-ol-e the f+$!o" of the %le %"d

the fe&ale a&ete- It re>'ires onl+ one parent? an" t#e offsprins pro"'$e" are ea$t $opies of

t#eir parents-

Two &et#o"s of ase'al repro"'$tion in ani&als are:

,!) Binar+ fission:

It !$ % t3*e of %$e6+%l re*rod+ct!o" !" wh!ch % $!"#le cell d!-!de$ !"to two h%l-e$( Or#%"!$$ th%t

re*rod+ce thro+#h &!"%r3 f!$$!o" %re &%cter!% %"d Amoeba( I"Amoeba the d!-!$!o" of cell$ c%" t%'e


27/59


28/59

Internal fertili2ation Eternal fertili2ation

It !"-ol-e$ the f+$!o" of the %le %"d the fe%le

#%ete !"$!de the fe%le &od3(

It !"-ol-e$ the f+$!o" of the %le %"d the fe%le

#%ete o+t$!de the fe%le &od3(

Ch%"ce$ of the $+r-!-%l of the off$*r!"# %re ore(

Therefore % $%ll "+&er of e##$ %re *rod+ced(

Ch%"ce$ of $+r-!-%l of the off$*r!"# %re le$$(

Therefore % l%r#e "+&er of e##$ %re *rod+ced(

H+%"$ cow$ he"$ %re or#%"!$$ $how!"#

!"ter"%l fert!l!4%t!o"(

0!$h fro# $t%rf!$h %re or#%"!$$ $how!"#

e6ter"%l fert!l!4%t!o"(

CHAPTER: 1@ Rea$#in at t#e ae of a"oles$en$e

Q1) 5h%t !$ the ter +$ed for $ecret!o"$ of e"docr!"e #l%"d$ re$*o"$!&le for ch%"#e$ t%'!"# *l%ce !"

the &od3

A"$: Horo"e$ %re che!c%l $+&$t%"ce$ wh!ch %re $ecreted &3 e"docr!"e #l%"d$( The3 %re

re$*o"$!&le for ch%"#e$ t%'!"# *l%ce !" the &od3(

Q) /ef!"e %dole$ce"ce(

A"$: Adole$ce"ce !$ the t!e *er!od &etwee" the &e#!""!"# of *+&ert3 %"d %d+lthood( /+r!"# th!$

*er!od the &od3 +"der#oe$ $e-er%l ch%"#e$ %lo"#$!de re*rod+ct!-e %t+r!t3( It &e#!"$ %ro+"d the %#e

of 11 %"d l%$t$ t!ll 18 or 1 3e%r$ of %#e( The *er!od of %dole$ce"ce %3 -%r3 fro *er$o" to *er$o"(

Q7) 5h%t !$ e"$tr+%t!o" E6*l%!"(

A"$: 2e"$tr+%t!o" !$ the *roce$$ of the $hedd!"# of the +ter!"e l!"!"# o" % re#+l%r o"thl3 &%$!$( It

&e#!"$ %t *+&ert3 %"d !$ the re*rod+ct!-e c3cle of the fe%le &od3( E-er3 o"th the +ter+$ *re*%re$

!t$elf to rece!-e % fert!l!4ed e##( Therefore the !""er l!"!"# of the +ter+$ &ecoe$ th!c' %"d !$ $+**l!ed

w!th &lood to "o+r!$h the e&r3o( If the e## !$ "ot fert!l!4ed the" the l!"!"# of the +ter+$ &re%'$ dow"

%"d #et$ rele%$ed !" the for of &lood thro+#h the -%#!"%( Th!$ l%$t$ for %&o+t two to e!#ht d%3$( Th!$

c3cle occ+r$ e-er3 o"th %"d !$ '"ow" %$ the e"$tr+%l c3cle(

Q) L!$t ch%"#e$ !" the &od3 th%t t%'e *l%ce %t *+&ert3(

A"$: Ch%"#e$ %t *+&ert3:

,!) S+dde" !"cre%$e !" he!#ht %"d we!#ht(

,!!) Bro%de"!"# of $ho+lder$ %"d w!de"!"# of che$t !" &o3$( I" #!rl$ the re#!o" &elow w%!$t &ecoe$

w!der(

,!!!) I" &o3$ +"der the !"fl+e"ce of horo"e$ the l%r3"6 &ecoe$ *ro!"e"t the -oc%l cord$ &ecoe

lo"#er %"d th!c'er( The$e ch%"#e$ c%+$e the -o!ce to &ecoe ho%r$e(

,!-) A**e%r%"ce of h%!r !" %re%$ $+ch %$ +"der%r$ f%ce h%"d$ %"d le#$(

,-) A**e%r%"ce of %c"e %$ % re$+lt of e6ce$$!-e $ecret!o" of o!l fro $'!"(,!-) Te$t!$ #row$ %"d $t%rt$ *rod+c!"# $*er$ !" %le$ where%$ !" fe%le$ the o-%r3 e"l%r#e$ %"d

$t%rt$ *rod+c!"# %t+red e##$(


29/59

Q?) Pre*%re % t%&le h%-!"# two col+"$ de*!ct!"# "%e$ of e"docr!"e #l%"d$ %"d horo"e$ $ecreted

&3 the(

A"$:

En"o$rine lan" Hor&ones

Te$t!$ Te$to$tero"e

O-%r3 Oe$tro#e"

Th3ro!d Th3ro6!"

Adre"%l Adre"%l!"

P%"cre%$ I"$+l!"

P!t+!t%r3 rowth horo"e

Q@) 5h%t %re $e6 horo"e$ 5h3 %re the3 "%ed $o St%te the!r f+"ct!o"(

A"$: Se6 horo"e$ %re che!c%l $+&$t%"ce$ *rod+ced &3 $e6 or#%"$( 0or e6%*le te$to$tero"e !$ the

%le $e6 horo"e *rod+ced &3 the te$t!$ %"d oe$tro#e" !$ the fe%le $e6 horo"e *rod+ced &3 the

o-%r3( The$e horo"e$ %ffect the $e6+%l fe%t+re$ of %" or#%"!$( He"ce the3 %re '"ow" %$ $e6

horo"e$(

('n$tions of se #or&ones:

Testosterone: Th!$ horo"e &r!"#$ %&o+t $eco"d%r3 $e6 ch%r%cter$ !" &o3$ $+ch %$ the #rowth of %

&e%rd the -o!ce &eco!"# ho%r$e de-elo*e"t of re*rod+ct!-e or#%"$ etc(

Oestroen:Th!$ horo"e !$ re$*o"$!&le for the de-elo*e"t of $eco"d%r3 $e6+%l ch%r%cter$ !"

fe%le$ $+ch %$ the e"l%r#ee"t of &re%$t$ de-elo*e"t of fe%le re*rod+ct!-e or#%"$ etc(

Q) Choo$e the correct o*t!o"(

,%) Adole$ce"t$ $ho+ld &e c%ref+l %&o+t wh%t the3 e%t &ec%+$e

,!) *ro*er d!et de-elo*$ the!r &r%!"$(

,!!) *ro*er d!et !$ "eeded for the r%*!d #rowth t%'!"# *l%ce !" the!r &od3(

,!!!) %dole$ce"t$ feel h+"#r3 %ll the t!e(

,!-) t%$te &+d$ %re well de-elo*ed !" tee"%#er$(

,&) Re*rod+ct!-e %#e !" woe" $t%rt$ whe" the!r

,!) e"$tr+%t!o" $t%rt$(

,!!) &re%$t$ $t%rt de-elo*!"#(

,!!!) &od3 we!#ht !"cre%$e$(

,!-) he!#ht !"cre%$e$(

,c) The r!#ht e%l for %dole$ce"t$ co"$!$t$ of

,!) ch!*$ "oodle$ co'e(,!!) chapatti dal -e#et%&le$(

,!!!) r!ce "oodle$ %"d &+r#er(

,!-) -e#et%&le c+tlet$ ch!*$ %"d leo" dr!"'(


30/59

A"$: ,%) ,!!) Adole$ce"t$ $ho+ld &e c%ref+l %&o+t wh%t the3 e%t &ec%+$e *ro*er d!et !$ "eeded for the

r%*!d #rowth t%'!"# *l%ce !" the!r &od3(

,&) ,!) Re*rod+ct!-e %#e !" woe" $t%rt$ whe" the!r e"$tr+%t!o" $t%rt$(

,c) ,!!) The r!#ht e%l for %dole$ce"t$ co"$!$t$ of chapatti dal -e#et%&le$(

Q8) 5r!te "ote$ o"

,%) Ad%>$ %**le(

,&) Seco"d%r3 $e6+%l ch%r%cter$(

,c) Se6 deter!"%t!o" !" the +"&or" &%&3(

A"$: ,%) A"a&s apple:

I" h+%" %le$ the l%r3"6 #row$ l%r#er d+r!"# *+&ert3 %"d c%" &e $ee" %$ % *rotr+d!"# *%rt of the

thro%t( Th!$ *rotr+$!o" !$ '"ow" %$ the Ad%>$ %**le( I" &o3$ +"der the !"fl+e"ce of $e6 horo"e$

the l%r3"6 &ecoe$ *ro!"e"t( A$ % re$+lt the -oc%l cord$ &ecoe lo"#er %"d th!c'er c%+$!"# the

-o!ce to &ecoe ho%r$e( Howe-er !" fe%le$ the l%r3"6 !$ of % $%ll $!4e %"d !$ h%rdl3 -!$!&le(

Therefore #!rl$ h%-e % h!#h *!tched -o!ce wh!le the -o!ce of &o3$ !$ low *!tched(

A"$: ,&) Se$on"ar+ se'al $#ara$ters%re tho$e fe%t+re$ th%t hel* !" d!$t!"#+!$h!"# the %le %"d the

fe%le &od3 fro e%ch other( The3 %re *h3$!c%l or &eh%-!o+r%l ch%r%cter!$t!c$ th%t %**e%r !" h+%"$ %t

the t!e of *+&ert3(

Seco"d%r3 $e6+%l ch%r%cter$ !" &o3$:

,!) A**e%r%"ce of o+$t%che %"d &e%rd(

,!!) A**e%r%"ce of che$t h%!r(

,!!!) rowth of h%!r !" #e"!t%l %re% %"d other *%rt$ of the $'!"(Seco"d%r3 $e6+%l ch%r%cter !" #!rl$:

,!) I"cre%$e !" &re%$t $!4e %"d d%r'e"!"# of the $'!" of "!**le$ *re$e"t %t the t!* of the &re%$t$(

,!!) rowth of h%!r !" #e"!t%l %re% %"d other &od3 *%rt$(

A"$: ,c) Se "eter&ination in an 'n%orn %a%+:

The $e6 of % &%&3 !$ deter!"ed &3 the t3*e of %le #%ete th%t f+$e$ w!th the fe%le #%ete(

All h+%" &e!"#$ h%-e 7 *%!r$ of chroo$oe$ !" the!r "+cle!( O+t of the$e 7 *%!r$ the l%$t *%!r !$

'"ow" %$ the $e6 chroo$oe(

The h+%" %le$ h%-e 7 *%!r$ of chroo$oe$ !"cl+d!"# G $e6 chroo$oe$( Therefore the %le

#%ete h%$ chroo$oe$ %"d e!ther %" or G $e6 chroo$oe(

2%le #%ete$ c%" &e of two t3*e$: or G

0e%le$ h%-e 7 *%!r$ of chroo$oe$ !"cl+d!"# $e6 chroo$oe$( Therefore the!r #%ete$ c%"

o"l3 h%-e chroo$oe$ %"d o"e $e6 chroo$oe(

T3*e of fe%le #%ete$:


31/59

Th+$ %$ the other *ro-!de$ o"l3 chroo$oe the $e6 of the &%&3 !$ deter!"ed &3 the t3*e of

%le #%ete , or G) th%t f+$e$ w!th the chroo$oe of the fe%le(

Q) 5ord #%e: U$e the cl+e$ to wor' o+t the word$(

Acro$$

7( Protr+d!"# -o!ce &o6 !" &o3$

( l%"d$ w!tho+t d+ct$

( E"docr!"e #l%"d %tt%ched to &r%!"

8( Secret!o" of e"docr!"e #l%"d$

( P%"cre%t!c horo"e

1D( 0e%le horo"e

/ow"

1( 2%le horo"e

( Secrete$ th3ro6!"

7( A"other ter for tee"%#e

?( Horo"e re%che$ here thro+#h &lood $tre%

@( Fo!ce &o6

( Ter for ch%"#e$ %t %dole$ce"ce

A"$: Acro$$

7( A/A2>S APPLE

( EN/OCRINE

( PITUITARG

8( HOR2ONE

( INSULIN


32/59

1D( ESTROEN

/ow"

1( TESTOSTERONE

( THGROI/

7( A/OLESCENCE

?( TARET SITE

@( LARGN

( PUBERTG

MMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMM

CHAPTER: 11 (or$e an" Press're

Q1) !-e two e6%*le$ e%ch of $!t+%t!o"$ !" wh!ch 3o+ *+$h or *+ll to ch%"#e the $t%te of ot!o" of

o&ect$(

A"$: Two e6%*le$ of *+$h force %re %$ follow$:

,!) A he%-3 &o6 %t re$t !$ *+$hed to o-e !t fro o"e roo to %"other( Th!$ ch%"#e$ the $t%te of

ot!o" of the &o6(

,!!) A *l%3er *+$he$ % foot&%ll +$!"# h!$ foot( Th!$ ch%"#e$ the $t%te of ot!o" of the &%ll(

Two e6%*le$ of *+ll force %re %$ follow$:

,!) Ro*e !$ *+lled to dr%w w%ter fro % well( Th!$ ch%"#e$ the $t%te of ot!o" of the w%ter &+c'et(

,!!) A dr%wer !$ *+lled to o*e" !t( Th!$ ch%"#e$ the $t%te of ot!o" of the dr%wer(

Q) !-e two e6%*le$ of $!t+%t!o"$ !" wh!ch %**l!ed force c%+$e$ % ch%"#e !" the $h%*e of %" o&ect(

A"$: Two e6%*le$ of force$ th%t c%+$e % ch%"#e !" the $h%*e of %" o&ect %re %$ follow$:

,!) S;+ee4!"# of % *l%$t!c &ottle ch%"#e$ the $h%*e of the &ottle(

,!!) /efor%t!o" of cl%3 &3 *re$$!"# !t &etwee" the h%"d$(

Q7) 'estion /:

0!ll !" the &l%"'$ !" the follow!"# $t%tee"t$(

,%) To dr%w w%ter fro % well we h%-e to ......... %t the ro*e(

,&) A ch%r#ed &od3 ........ %" +"ch%r#ed &od3 tow%rd$ !t(

,c) To o-e % lo%ded trolle3 we h%-e to ......... !t(

,d) The "orth *ole of % %#"et ........ the "orth *ole of %"other %#"et(


33/59

A"$: ,%) To dr%w w%ter fro % well we h%-e to ..*+ll.. %t the ro*e(

,&) A ch%r#ed &od3 ..%ttr%ct$.. %" +"ch%r#ed &od3 tow%rd$ !t(

,c) To o-e % lo%ded trolle3 we h%-e to ..e!ther *+$h or *+ll.. !t(

,d) The "orth *ole of % %#"et ..re*el$.. the "orth *ole of %"other %#"et(

Q) A" %rcher $tretche$ her &ow wh!le t%'!"# %! %t the t%r#et( She the" rele%$e$ the %rrow wh!ch

&e#!"$ to o-e tow%rd$ the t%r#et( B%$ed o" th!$ !"for%t!o" f!ll +* the #%*$ !" the follow!"#

$t%tee"t$ +$!"# the follow!"# ter$(

+$c+l%r co"t%ct "o"


34/59

Q) A" !"fl%ted &%lloo" w%$ *re$$ed %#%!"$t % w%ll %fter !t h%$ &ee" r+&&ed w!th % *!ece of $3"thet!c

cloth( It w%$ fo+"d th%t the &%lloo" $t!c'$ to the w%ll( 5h%t force !#ht &e re$*o"$!&le for the

%ttr%ct!o" &etwee" the &%lloo" %"d the w%ll

A"$: O" r+&&!"# %" !"fl%ted &%lloo" w!th % *!ece of $3"thet!c cloth !t &ecoe$ ch%r#ed( A ch%r#ed

&od3 %ttr%ct$ %" +"ch%r#ed &od3( 5he" th!$ ch%r#ed &%lloo" !$ *re$$ed %#%!"$t % w%ll !t $t!c'$ to the

w%ll( The force %ct!"# &etwee" the ch%r#ed &%lloo" %"d the w%ll !$ the electro$t%t!c force(

Q8) N%e the force$ %ct!"# o" % *l%$t!c &+c'et co"t%!"!"# w%ter held %&o-e #ro+"d le-el !" 3o+r h%"d(

/!$c+$$ wh3 the force$ %ct!"# o" the &+c'et do "ot &r!"# % ch%"#e !" !t$ $t%te of ot!o"(

A"$: 5e %'e +$e of +$c+l%r force to hold % &+c'et of w%ter %&o-e the #ro+"d( Th!$ +$c+l%r force

%ct$ %#%!"$t the force of #r%-!t3 th%t *+ll$ the &+c'et tow%rd$ the #ro+"d( The two force$ %re e;+%l !"

%#"!t+de &+t o**o$!te !" d!rect!o"( Therefore the "et force o" the &+c'et !$ 4ero( He"ce there !$ "o

ch%"#e !" !t$ $t%te of ot!o"(

Q) A roc'et h%$ &ee" f!red +*w%rd$ to l%+"ch % $%tell!te !" !t$ or&!t( N%e the two force$ %ct!"# o"

the roc'et !ed!%tel3 %fter le%-!"# the l%+"ch!"# *%d(

A"$: The two force$ %ct!"# o" the roc'et %re the force of #r%-!t3 wh!ch *+ll$ the roc'et tow%rd$ the

#ro+"d %"d the force of fr!ct!o" d+e to e%rth>$ %to$*here wh!ch o**o$e$ !t$ ot!o"(

Q1D) 5he" we *re$$ the &+l& of % dro**er w!th !t$ "o44le 'e*t !" w%ter %!r !" the dro**er !$ $ee" to

e$c%*e !" the for of &+&&le$( O"ce we rele%$e the *re$$+re o" the &+l& w%ter #et$ f!lled !" the

dro**er( The r!$e of w%ter !" the dro**er !$ d+e to

,%) *re$$+re of w%ter(,&) #r%-!t3 of the e%rth(

,c) $h%*e of r+&&er &+l&

,d) %to$*her!c *re$$+re

A"$: ,d) The r!$e of w%ter !" the dro**er !$ d+e to %to$*her!c *re$$+re(

The r!$e of w%ter !" % dro**er !$ d+e to %to$*her!c *re$$+re( 5he" %ll the %!r e$c%*e$ fro the

"o44le the %to$*her!c *re$$+re wh!ch !$ %ct!"# o" the w%ter force$ the w%ter to f!ll the "o44le of the

dro**er(


35/59

,c) 0r!ct!o" *rod+ce$ ..he%t..(

,d) S*r!"'l!"# of *owder o" the c%rro &o%rd ..red+ce$.. fr!ct!o"(

,e) Sl!d!"# fr!ct!o" !$ ..le$$.. th%" the $t%t!c fr!ct!o"(

Q) 0o+r ch!ldre" were %$'ed to %rr%"#e force$ d+e to roll!"# $t%t!c %"d $l!d!"# fr!ct!o"$ !" %

"e$reasin or"er( The!r %rr%"#ee"t$ %re #!-e" &elow( Choo$e the correct %rr%"#ee"t(

,%) roll!"# $t%t!c $l!d!"#

,&) roll!"# $l!d!"# $t%t!c

,c) $t%t!c $l!d!"# roll!"#

,d) $l!d!"# $t%t!c roll!"#

A"$: ,c) $t%t!c $l!d!"# roll!"#

0r!ct!o" coe$ !"to *l%3 whe" !rre#+l%r!t!e$ *re$e"t !" the $+rf%ce$ of two o&ect$ !" co"t%ct #et

!"terloc'ed w!th e%ch other( St%t!c fr!ct!o" coe$ !"to *l%3 whe" we tr3 to o-e %" o&ect wh!ch !$ %t

re$t( Sl!d!"# fr!ct!o" coe$ !"to *l%3 whe" %" o&ect $l!de$ o-er the $+rf%ce of %"other o&ect( I"

$l!d!"# fr!ct!o" the t!e #!-e" for !"terloc'!"# !$ -er3 $%ll( He"ce !"terloc'!"# !$ "ot $tro"#(

Therefore le$$ force !$ re;+!red to o-ercoe th!$ !"terloc'!"#( Bec%+$e of th!$ re%$o" $l!d!"# fr!ct!o"

!$ le$$ th%" $t%t!c fr!ct!o"( S!!l%rl3 the %re% of co"t%ct !" c%$e of roll!"# fr!ct!o" !$ $%lle$t %$

co*%red to $t%t!c or $l!d!"# fr!ct!o"( Th!$ %re% of co"t%ct ch%"#e$ #r%d+%ll3 &ec%+$e of roll!"#(

He"ce roll!"# fr!ct!o" !$ le$$er th%" &oth $t%t!c %"d $l!d!"# fr!ct!o"( Th+$ the correct $e;+e"ce !$

$t%t!c $l!d!"# roll!"#(

Q7) Al!d% r+"$ her to3 c%r o" dr3 %r&le floor wet %r&le floor "ew$*%*er %"d towel $*re%d o" the

floor( The force of fr!ct!o" %ct!"# o" the c%r o" d!ffere"t $+rf%ce$ !" in$reasin or"erw!ll &e,%) wet %r&le floor dr3 %r&le floor "ew$*%*er %"d towel(

,&) "ew$*%*er towel dr3 %r&le floor wet %r&le floor(

,c) towel "ew$*%*er dr3 %r&le floor wet %r&le floor

,d) wet %r&le floor dr3 %r&le floor towel "ew$*%*er

A"$: ,%) wet %r&le floor dr3 %r&le floor "ew$*%*er %"d towel

0orce of fr!ct!o" de*e"d$ o" the "%t+re of $+rf%ce$ !" co"t%ct( The ro+#her the $+rf%ce the ore !$ the

fr!ct!o" &etwee" the $+rf%ce$ !" co"t%ct %"d -!ce


36/59

Q?) Go+ $*!ll % &+c'et of $o%*3 w%ter o" % %r&le floor %cc!de"t%ll3( 5o+ld !t %'e !t e%$!er or ore

d!ff!c+lt for 3o+ to w%l' o" the floor 5h3

A"$: 5e %re %&le to w%l' &ec%+$e of the fr!ct!o" *re$e"t &etwee" o+r feet %"d the #ro+"d( I" order to

w%l' we *+$h the #ro+"d !" the &%c'w%rd d!rect!o" w!th o+r feet( The force of fr!ct!o" *+$he$ !t !" the

forw%rd d!rect!o" %"d %llow$ +$ to w%l'( The force of fr!ct!o" &etwee" the #ro+"d %"d feet decre%$e$

whe" there !$ $o%*3 w%ter $*!lled o" the floor( He"ce !t &ecoe$ d!ff!c+lt to w%l' o" the $o%*3 floor(

Q@) E6*l%!" wh3 $*ort$e" +$e $hoe$ w!th $*!'e$(

A"$: S*ort$e" +$e $hoe$ w!th $*!'e$ &ec%+$e the$e $hoe$ #!-e the % &etter #r!* wh!le r+""!"#( Th!$

!$ &ec%+$e the force of fr!ct!o" &etwee" the $hoe$ %"d the #ro+"d !"cre%$e$ w!th the hel* of $*!'e$(

Q) I;&%l h%$ to *+$h % l!#hter &o6 %"d See% h%$ to *+$h % $!!l%r he%-!er &o6 o" the $%e floor(

5ho w!ll h%-e to %**l3 % l%r#er force %"d wh3

A"$: 0orce of fr!ct!o" %r!$e$ &ec%+$e of !"terloc'!"# of !rre#+l%r!t!e$ o" the two $+rf%ce$ !" co"t%ct(

5he" % he%-3 o&ect !$ *l%ced o" the floor the !"terloc'!"# of !rre#+l%r!t!e$ o" the $+rf%ce$ of &o6 %"d

floor &ecoe $tro"#( Th!$ !$ &ec%+$e the two $+rf%ce$ !" co"t%ct %re *re$$ed h%rder( He"ce ore force

!$ re;+!red to o-ercoe the !"terloc'!"#( Th+$ to *+$h the he%-!er &o6 See% h%$ to %**l3 % #re%ter

force th%" I;&%l(

Q8) E6*l%!" wh3 $l!d!"# fr!ct!o" !$ le$$ th%" $t%t!c fr!ct!o"(A"$: 0r!ct!o" coe$ !"to *l%3 whe" !rre#+l%r!t!e$ *re$e"t !" the $+rf%ce$ of two o&ect$ !" co"t%ct #et

!"terloc'ed w!th e%ch other( I" $l!d!"# the t!e #!-e" for !"terloc'!"# !$ -er3 $%ll( He"ce

!"terloc'!"# !$ "ot $tro"#( Therefore le$$ force !$ re;+!red to o-ercoe th!$ !"terloc'!"#( Bec%+$e of

th!$ re%$o" $l!d!"# fr!ct!o" !$ le$$ th%" $t%t!c fr!ct!o"(

Q) !-e e6%*le$ to $how th%t fr!ct!o" !$ &oth % fr!e"d %"d % foe(

A"$: Ad-%"t%#e$ of fr!ct!o":

,!) 5e %re %&le to w%l' &ec%+$e of fr!ct!o"(

,!!) 0r!ct!o" &etwee" the t!* of the *e" %"d % *%*er %llow$ +$ to wr!te(

/!$%d-%"t%#e$ of fr!ct!o":

,!) T3re$ %"d $ole$ of $hoe$ we%r o+t &ec%+$e of fr!ct!o"(

,!!) 0r!ct!o" &etwee" the d!ffere"t *%rt$ of %ch!"e$ *rod+ce$ he%t( Th!$ c%" d%%#e the %ch!"e$(

Q1D) E6*l%!" wh3 o&ect$ o-!"# !" fl+!d$ +$t h%-e $*ec!%l $h%*e$(

A"$: 5he" % &od3 o-e$ thro+#h % fl+!d !t e6*er!e"ce$ %" o**o$!"# force wh!ch tr!e$ to o**o$e !t$

ot!o" thro+#h the fl+!d( Th!$ o**o$!"# force !$ '"ow" %$ the dr%# force( Th!$ fr!ct!o"%l force de*e"d$

o" the $h%*e of the &od3( B3 #!-!"# o&ect$ % $*ec!%l $h%*e the force of fr!ct!o" %ct!"# o" !t c%" &e

!"!!$ed( He"ce !t &ecoe$ e%$!er for the &od3 to o-e thro+#h the fl+!d(


37/59

CHAPTER: 1/ So'n"

Q1) Choo$e the correct %"$wer(

So+"d c%" tr%-el thro+#h

,%) #%$e$ o"l3 ,&) $ol!d$ o"l3

,c) l!;+!d$ o"l3 ,d) $ol!d$ l!;+!d$ %"d #%$e$(

A"$: ,d) So+"d c%" tr%-el thro+#h $ol!d$ l!;+!d$ %"d #%$e$(

So+"d re;+!re$ % ed!+ to tr%-el thro+#h( Sol!d l!;+!d %"d #%$ *ro-!de the ed!+ for $o+"d(

He"ce $o+"d c%" tr%-el thro+#h $ol!d$ l!;+!d$ %"d #%$e$(

Q) 5h!ch of the follow!"# -o!ce$ !$ l!'el3 to h%-e !"!+ fre;+e"c3

,%) B%&3 #!rl ,&) B%&3 &o3

,c) A %" ,d) A wo%"

A"$: ,c) A %"

The -o!ce of %" %d+lt %" !$ of lower *!tch !" co*%r!$o" to the -o!ce$ of % &%&3 &o3 % &%&3 #!rl %"d

% wo%"( S!"ce fre;+e"c3 of % $o+"d !$ d!rectl3 *ro*ort!o"%l to !t$ *!tch %">$ -o!ce !$ of !"!+

fre;+e"c3 !" co*%r!$o" to % &o3 % #!rl or % wo%">$ -o!ce(

Q7) I" the follow!"# $t%tee"t$ t!c' =T> %#%!"$t tho$e wh!ch %re tr+e %"d =0> %#%!"$t tho$e wh!ch %re

f%l$e(

,%) So+"d c%""ot tr%-el !" -%c++( ,T 0)

,&) The "+&er of o$c!ll%t!o"$ *er $eco"d of % -!&r%t!"# o&ect !$ c%lled !t$ t!e *er!od( ,T 0)

,c) If the %*l!t+de of -!&r%t!o" !$ l%r#e $o+"d !$ fee&le( ,T 0)

,d) 0or h+%" e%r$ the %+d!&le r%"#e !$ D H4 to DDDD H4( ,T 0),e) The lower the fre;+e"c3 of -!&r%t!o" the h!#her !$ the *!tch( ,T 0)

,f) U"w%"ted or +"*le%$%"t $o+"d !$ tered %$ +$!c( ,T 0)

,#) No!$e *oll+t!o" %3 c%+$e *%rt!%l he%r!"# !*%!re"t( ,T0)

A"$: ,%) Tr+e

So+"d re;+!re$ % ed!+ to tr%-el thro+#h( S!"ce -%c++ !$ de-o!d of %"3 ed!+ $o+"d c%""ot

tr%-el thro+#h !t(

,&) 0%l$e

The "+&er of o$c!ll%t!o"$ *er $eco"d of % -!&r%t!"# o&ect !$ '"ow" %$ !t$ fre;+e"c3( T!e *er!od !$

the t!e re;+!red to co*lete o"e o$c!ll%t!o"(

,c) 0%l$e

Lo+d"e$$ of % $o+"d !$ *ro*ort!o"%l to the $;+%re of the %*l!t+de of !t$ -!&r%t!o"( 5he" the

%*l!t+de of -!&r%t!o" of % $o+"d !$ l%r#e the $o+"d !$ -er3 lo+d( The $o+"d !$ fee&le for $%ll

%*l!t+de(

,d) Tr+e

H+%"$ c%""ot he%r $o+"d$ of %ll fre;+e"c!e$( H+%"$ c%" he%r % $o+"d who$e fre;+e"c3 f%ll$ !" the

r%"#e of D H4DDDD H4( The $o+"d h%-!"# fre;+e"c3 o+t of th!$ r%"#e !$ !"%+d!&le to h+%"$(

,e) 0%l$e


38/59

The *!tch of % $o+"d !$ *ro*ort!o"%l to !t$ fre;+e"c3( A$ the fre;+e"c3 of -!&r%t!o" !"cre%$e$ the *!tch

of the $o+"d %l$o !"cre%$e$ %"d -!ce


39/59

T!e *er!od

Q) Ide"t!f3 the *%rt wh!ch -!&r%te$ to *rod+ce $o+"d !" the follow!"# !"$tr+e"t$(

,%)#holak,&) Sitar,c) 0l+te

A"$: ,%)#holak!$ % +$!c%l !"$tr+e"t( It co"$!$t$ of % $tretched e&r%"e c%lled !t$ he%d( 5he" the

he%d !$ &e%te" #e"tl3 the $tretched e&r%"e $et$ !"to -!&r%t!o"( S!"ce $o+"d !$ *rod+ced whe" %"

o&ect -!&r%te$ the dholak*rod+ce$ % $o+"d(

A"$: ,&) Sitar!$ % +$!c%l !"$tr+e"t( It co"$!$t$ of $tretched $tr!"#$( 5he" % $tr!"# !$ *l+c'ed !t $et$

!"to -!&r%t!o"( S!"ce $o+"d !$ *rod+ced whe" %" o&ect -!&r%te$ thesitar*rod+ce$ % $o+"d(

A"$: ,c) 0l+te!$ % hollow *!*e( 5he" %!r !$ &low" o-er !t$ o+th the %!r !"$!de the *!*e !$ $et !"to

-!&r%t!o"( A$ % re$+lt % *le%$%"t $o+"d !$ *rod+ced(

Q8) 5h%t !$ the d!ffere"ce &etwee" "o!$e %"d +$!c C%" +$!c &ecoe "o!$e $oet!e$

A"$:The $o+"d th%t !$ *le%$!"# to the e%r !$ c%lled +$!c( 0or e6%*le the $o+"d *rod+ced &3 -!ol!"$

*!%"o$ fl+te$pungs etc(

The $o+"d th%t !$ +"*le%$!"# to the e%r !$ c%lled "o!$e(

Soe e6%*le$ of "o!$e %re %$ follow$:

,!) So+"d *rod+ced &3 hor"$ of &+$e$ %"d tr+c'$

,!!) So+"d of electr!c%l #e"er%tor$

,!!!) So+"d of % #+" $hot

,!-) So+"d *rod+ced &3 %c'h%er$

Ge$( 2+$!c c%" &ecoe "o!$e whe" *l%3ed %t h!#h -ol+e$(Q) L!$t $o+rce$ of "o!$e *oll+t!o" !" 3o+r $+rro+"d!"#$(

A"$: Soe $o+rce$ of "o!$e *oll+t!o" %re %$ follow$:

,!) Tele-!$!o"$ %"d tr%"$!$tor$ r+""!"# %t h!#h -ol+e$

,!!) Lo+d$*e%'er$ %"d cr%c'er$

,!!!) Hor"$ of &+$e$ c%r$ %"d tr+c'$

,!-) Hoe %**l!%"ce$ $+ch %$ !6er de$ert cooler etc(

Q1D) E6*l%!" !" wh%t w%3 "o!$e *oll+t!o" !$ h%rf+l to h+%"$(

A"$: No!$e *oll+t!o" c%" le%d to % "+&er of he%lth


40/59

A"$: There w!ll &e ore "o!$e !" the ho+$e wh!ch !$ %lo"# the ro%d$!de( Th!$ !$ &ec%+$e "o!$e

*rod+ced &3 tr%"$*ort%t!o" -eh!cle$ %3 c%+$e tro+&le to the re$!de"t$( The !"te"$!t3 of "o!$e

decre%$e$ w!th the d!$t%"ce &etwee" the $o+rce %"d the l!$te"er( He"ce !t !$ &etter to t%'e the ho+$e

th%t !$ three l%"e$ %w%3 fro the ro%d$!de(

Q1) S'etch l%r3"6 %"d e6*l%!" !t$ f+"ct!o" !" 3o+r ow" word$(

A"$:L%r3"6 !$ % *%rt of the thro%t( It !$ re$*o"$!&le for *rod+ct!o" of $o+"d( A $'etch of % h+%"

l%r3"6 !$ $how" !" the follow!"# f!#+re(

L%r3"6 o-e$ whe" we $w%llow $oeth!"#( I"$!de the l%r3"6 there %re two -oc%l cord$( There !$ %

$%ll #%* &etwee" the( Th!$ $%ll #%* %llow$ %!r to *%$$ thro+#h( 5he" we $*e%' %!r !$ forced !"to

th!$ $%ll #%* &3 the l+"#$( Th!$ *ro*t$ -oc%l cord$ to -!&r%te( S!"ce -!&r%t!"# o&ect$ *rod+ce

$o+"d $o+"d !$ *rod+ced d+e to the -!&r%t!o" of -oc%l cord$(

Q17) L!#ht"!"# %"d th+"der t%'e *l%ce !" the $'3 %t the $%e t!e %"d %t the $%e d!$t%"ce fro +$(

L!#ht"!"# !$ $ee" e%rl!er %"d th+"der !$ he%rd l%ter( C%" 3o+ e6*l%!"

A"$: The $*eed of $o+"d !$ le$$ th%" the $*eed of l!#ht( He"ce l!#ht re%che$ +$ &efore the $o+"d

d+r!"# % l!#ht"!"# wh!ch !$ %cco*%"!ed &3 th+"der!"#(


41/59

,5he" %" electr!c c+rre"t *%$$e$ thro+#h % co**er $+l*h%te $ol+t!o" the $ol+t!o" deco*o$e$ !"to

*o$!t!-el3 ch%r#ed co**er !o"$ %"d "e#%t!-el3 ch%r#ed $+l*h%te !o"$( The$e *o$!t!-el3 ch%r#ed co**er

!o"$ #et %ttr%cted tow%rd$ the *l%te wh!ch !$ co""ected to the "e#%t!-e ter!"%l of % &%tter3()

,d) The *roce$$ of de*o$!t!"# % l%3er of %"3 de$!red et%l o" %"other %ter!%l &3 e%"$ of electr!c!t3

!$ c%lled ..electro*l%t!"#..(

Q) 5he" the free e"d$ of % te$ter %re d!**ed !"to % $ol+t!o" the %#"et!c "eedle $how$ deflect!o"(

C%" 3o+ e6*l%!" the re%$o"

A"$: The deflect!o" !" the co*%$$ "eedle $how$ th%t c+rre"t !$ flow!"# thro+#h the wo+"ded w!re

%"d he"ce thro+#h the c!rc+!t( The c!rc+!t !$ co*lete $!"ce free e"d$ of the te$ter %re d!**ed !" %

$ol+t!o"( The $ol+t!o" !$ cert%!"l3 % co"d+ct!"# $ol+t!o"( Th!$ !$ the re%$o" wh3 the co*%$$ "eedle

$how$ % deflect!o"(

Q7) N%e three l!;+!d$ wh!ch whe" te$ted !" the %""er $how" !" 0!#( 1( %3 c%+$e the %#"et!c

"eedle to deflect(

A"$:L!;+!d$ l!'e leo" +!ce $%lt w%ter %"d -e#et%&le o!l %llow electr!c!t3 to *%$$ thro+#h the(

He"ce the$e l!;+!d$ c%" &e +$ed %$ !" the &e%'er to $how the #!-e" effect(

Q) The &+l& doe$ "ot #low !" the $et+* $how" !" 0!#( 1(1D( L!$t the *o$$!&le re%$o"$( E6*l%!" 3o+r

%"$wer(

A"$: The &+l& %3 "ot #low &ec%+$e of the follow!"# re%$o"$:

,!) L!;+!d !" the &e%'er !$ "o"


42/59

,!!) Electr!c c+rre"t !" the c!rc+!t !$ -er3 we%'( Th!$ c%" h%**e" !f the %ter!%l +$ed for %'!"# the

c!rc+!t !$ "ot % #ood co"d+ctor of electr!c!t3 or the &%tter3 doe$ "ot h%-e $+ff!c!e"t e"er#3 to #e"er%te

electr!c!t3(

Q?) A te$ter !$ +$ed to chec' the co"d+ct!o" of electr!c!t3 thro+#h two l!;+!d$ l%&elled A %"d B( It !$

fo+"d th%t the &+l& of the te$ter #low$ &r!#htl3 for l!;+!d A wh!le !t #low$ -er3 d!l3 for l!;+!d B(

Go+ wo+ld co"cl+de th%t

,!) l!;+!d A !$ % &etter co"d+ctor th%" l!;+!d B(

,!!) l!;+!d B !$ % &etter co"d+ctor th%" l!;+!d A(

,!!!) Both l!;+!d$ %re e;+%ll3 co"d+ct!"#(

,!-)Co"d+ct!"# *ro*ert!e$ of l!;+!d c%""ot &e co*%red !" th!$ %""er(

,!) L!;+!d A !$ % &etter co"d+ctor th%" l!;+!d B(

A"$: The %o+"t of c+rre"t flow!"# thro+#h % co"d+ct!"# $ol+t!o" de*e"d$ o" the co"d+ct!-!t3 of the

$ol+t!o"( 5!th ore co"d+ct!-!t3 ore c+rre"t *%$$e$ thro+#h the $ol+t!o" %"d -!ce


43/59

A"$:R%!" w%ter co"t%!"$ d!$$ol-ed $%lt$( Th!$ %'e$ !t % co"d+ct!"# $ol+t!o"( There %re "o d!$$ol-ed

$%lt$ *re$e"t !" the d!$t!lled w%ter( He"ce r%!" w%ter c%" %llow electr!c!t3 to *%$$ thro+#h !t wh!le

d!$t!lled w%ter c%""ot(

Q11) Pre*%re % l!$t of o&ect$ %ro+"d 3o+ th%t %re electro*l%ted(

A"$:E6%*le$ of electro*l%ted o&ect$ %re %$ follow$:

,!) Chro!+ *l%t!"# !$ do"e o" d!ffere"t *%rt$ of c%r$ &+$e$ %"d otor c3cle$ to #!-e the $h!"3

%**e%r%"ce(

!!( A f!"e l%3er of #old !$ de*o$!ted o" the $!l-er or"%e"t$ %"d the3 %re c%lled #old


44/59

Q7) 5r!te T %#%!"$t tr+e %"d 0 %#%!"$t f%l$e !" the follow!"# $t%tee"t$(

,%) L!'e ch%r#e$ %ttr%ct e%ch other( ,T 0)

,&) A ch%r#ed #l%$$ rod %ttr%ct$ % ch%r#ed *l%$t!c $tr%w( ,T 0)

,c) L!#ht"!"# co"d+ctor c%""ot *rotect % &+!ld!"# fro l!#ht"!"#( ,T0)

,d) E%rth;+%'e$ c%" &e *red!cted !" %d-%"ce( ,T 0)

A"$: ,%) 0%l$e

L!'e ch%r#e$ re*el e%ch other( It !$ the +"l!'e ch%r#e$ th%t %ttr%ct e%ch other(

,&) Tr+e

A ch%r#ed #l%$$ rod h%$ *o$!t!-e ch%r#e$ o" !t$ $+rf%ce wh!le % ch%r#ed *l%$t!c $tr%w h%$ "e#%t!-e

ch%r#e$ o" !t$ $+rf%ce( S!"ce +"l!'e ch%r#e$ %ttr%ct e%ch other % ch%r#ed #l%$$ rod %ttr%ct$ % ch%r#ed

*l%$t!c $tr%w(

,c) 0%l$e

/+r!"# % l!#ht"!"# the l!#ht"!"# co"d+ctor co"d+ct$ %ll the %to$*her!c ch%r#e$ to the E%rth d!rectl3

le%-!"# the &+!ld!"# $%fe( He"ce l!#ht"!"# co"d+ctor$ *rotect % &+!ld!"# fro l!#ht"!"#(

,d) 0%l$e

Altho+#h the c%+$e$ of e%rth;+%'e$ !$ '"ow" &+t "o !"$tr+e"t co+ld &e !"-e"ted to detect !t t!ll "ow(

He"ce e%rth;+%'e$ c%""ot &e *red!cted !" %d-%"ce(

Q) Soet!e$ % cr%c'l!"# $o+"d !$ he%rd wh!le t%'!"# off % $we%ter d+r!"# w!"ter$( E6*l%!"(

A"$:5he" % $we%ter !$ t%'e" off the woolle" $we%ter #et$ ch%r#ed &ec%+$e of the fr!ct!o" &etwee"

the $we%ter %"d the &od3( He"ce o"e c%" he%r % cr%c'l!"# $o+"d d+r!"# the #!-e" *roce$$(

Q?) E6*l%!" wh3 % ch%r#ed &od3 lo$e$ !t$ ch%r#e !f we to+ch !t w!th o+r h%"d(A"$: 5he" we to+ch % ch%r#ed o&ect o+r &od3 co"d+ct$ !t$ ch%r#e$ to the e%rth( Th%t !$ wh3 %

ch%r#ed &od3 lo$e$ !t$ ch%r#e !f we to+ch !t w!th o+r h%"d( Th!$ *he"oe"o" !$ '"ow" %$ electr!c

d!$ch%r#e(

Q@) N%e the $c%le o" wh!ch the de$tr+ct!-e e"er#3 of %" e%rth;+%'e !$ e%$+red( A" e%rth;+%'e

e%$+re$ 7 o" th!$ $c%le( 5o+ld !t &e recorded &3 % $e!$o#r%*h I$ !t l!'el3 to c%+$e +ch d%%#e

A"$: The de$tr+ct!-e e"er#3 of %" e%rth;+%'e !$ e%$+red &3 the R!chter $c%le( Th!$ $c%le h%$ the

re%d!"#$ fro 1 to 1D(

The re%d!"# of %#"!t+de 7 o" the R!chter $c%le wo+ld &e recorded &3 % $e!$o#r%*h(

If the R!chter $c%le #!-e$ % re%d!"# of %#"!t+de 7 the" the e%rth;+%'e !$ "ot l!'el3 to c%+$e +ch

d%%#e( e"er%ll3 e%rth;+%'e of %#"!t+de$ h!#her th%" ? !$ co"$!dered de$tr+ct!-e !" "%t+re(

Q) S+##e$t three e%$+re$ to *rotect o+r$el-e$ fro l!#ht"!"#(

A"$: Protect!-e e%$+re$ %#%!"$t l!#ht"!"# %re %$ follow$:

,!) St%3 !" % co*letel3 clo$ed *l%ce( If 3o+ %re o-!"# !" % c%r the" re%!" there +"t!l the l!#ht"!"#

!$ o-er( Clo$e the w!"dow$ of the c%r !ed!%tel3(

,!!) /o "ot to+ch %"3 electr!c%l w!re$ tele*ho"e c%&le$ et%l *!*e$ etc(

,!!!) /o "ot &%th !" r+""!"# w%ter( Th!$ %3 c%+$e %" electr!c $hoc'(


45/59

Q8) E6*l%!" wh3 % ch%r#ed &%lloo" !$ re*elled &3 %"other ch%r#ed &%lloo" where%$ %" +"ch%r#ed

&%lloo" !$ %ttr%cted &3 %"other ch%r#ed &%lloo"

A"$: The "%t+re of ch%r#e$ *re$e"t o" the $+rf%ce of ch%r#ed &%lloo"$ %re $!!l%r( S!"ce l!'e ch%r#e$

re*el e%ch other two ch%r#ed &%lloo"$ re*el e%ch other( 5he" % ch%r#ed &od3 !$ &ro+#ht "e%r %"

+"ch%r#ed &od3 the +"ch%r#ed &od3 %c;+!re$ ch%r#e$ o" !t$ $+rf%ce c%+$ed &3 the !"d+ct!o" of

ch%r#e$( The ch%r#e$ %re of o**o$!te "%t+re !" rel%t!o" to the ch%r#ed &od3( S!"ce +"l!'e ch%r#e$

%ttr%ct e%ch other % ch%r#ed &od3 %lw%3$ %ttr%ct$ %" +"ch%r#ed &od3( He"ce %" +"ch%r#ed &%lloo" !$

%ttr%cted &3 %"other ch%r#ed &%lloo"(

Q) A" electro$co*e c%" &e +$ed to detect whether % &od3 !$ ch%r#ed or "ot( The follow!"# f!#+re

$how$ % $!*le electro$co*e(

It co"$!$t$ of % et%l rod( At o"e e"d of the rod two le%-e$ of %l+!"!+ fo!l %re f!6ed %"d %t the other

e"d there !$ % et%l d!$c( The le%-e$ of %l+!"!+ fo!l %re *l%ced !"$!de % co"!c%l fl%$' %"d the fl%$'!$ cor'ed to !$ol%te the le%-e$ fro %!r(

5he" the et%l d!$c !$ to+ched w!th % ch%r#ed &od3 the %l+!"!+ $tr!*$ o-e %w%3 fro e%ch

other( Th!$ h%**e"$ &ec%+$e $oe of the ch%r#e$ of the &od3 %re tr%"$ferred to the $tr!*$ thro+#h the

et%l rod( Th!$ ethod of ch%r#!"# % &od3 !$ c%lled ch%r#!"# &3 co"d+ct!o"( The "%t+re of ch%r#e$ o"

&oth the le%-e$ %"d the ch%r#ed &od3 %re the $!!l%r( He"ce &oth the le%-e$ of the %l+!"!+ fo!l w!ll

o-e %w%3 fro e%ch other( If the &od3 w%$ "ot ch%r#ed the" the le%-e$ of the fo!l wo+ld re%!" %$

the3 were &efore( The3 wo+ld "ot re*el e%ch other(

Q1D) L!$t three $t%te$ !" I"d!% where e%rth;+%'e$ %re ore l!'el3 to $tr!'e(

A"$: The three $t%te$ !" I"d!% where e%rth;+%'e$ %re ore l!'el3 to $tr!'e %re J%+ %"d %$h!r

+r%t %"d A$$%(

Q11) S+**o$e 3o+ %re o+t$!de 3o+r hoe %"d %" e%rth;+%'e $tr!'e$( 5h%t *rec%+t!o" wo+ld 3o+ t%'e

to *rotect 3o+r$elf

A"$: Soe of the *rec%+t!o"$ %re %$ follow$:

,!) Tr3 to f!"d %" o*e" f!eld %w%3 fro t%ll &+!ld!"#$ !"$t%ll%t!o"$ t%ll tree$ %"d electr!c w!re$ %"d

*ole$(

,!!) If tr%-ell!"# !" % &+$ or % c%r the" do "ot coe o+t whe" %" e%rth;+%'e $tr!'e$( A$' the dr!-er to

dr!-e !" %" o*e" f!eld(


46/59

Q1) The we%ther de*%rte"t h%$ *red!cted th%t % th+"der$tor !$ l!'el3 to occ+r o" % cert%!" d%3(

S+**o$e 3o+ h%-e to #o o+t o" th%t d%3( 5o+ld 3o+ c%rr3 %" +&rell% E6*l%!"(

A"$: No( 5e $ho+ld "ot c%rr3 %" +&rell% !" % th+"der$tor( /+r!"# th+"der$tor$ wh!ch %re

%cco*%"!ed w!th l!#ht"!"# electr!c d!$ch%r#e fro the clo+d$ c%" tr%-el thro+#h the et%ll!c rod of

the +&rell%( Th!$ %3 #!-e %" electr!c $hoc' to the *er$o" who !$ c%rr3!"# !t( He"ce !t !$ "ot $%fe to

c%rr3 %" +&rell% d+r!"# l!#ht"!"#(


47/59

2%r&le floor w!th w%ter $*re%d o-er !t !$ %" e6%*le of % re#+l%r $+rf%ce( Th!$ !$ &ec%+$e w%ter %'e$

the %r&le $+rf%ce $ooth( He"ce re#+l%r reflect!o" w!ll t%'e *l%ce fro th!$ $+rf%ce(

A"$: ,e) 2!rror 9 Re#+l%r reflect!o"

2!rror h%$ % $ooth $+rf%ce( Therefore !t w!ll #!-e % re#+l%r reflect!o"(

,f) P!ece of *%*er 9 /!ff+$ed reflect!o"

Altho+#h % *!ece of *%*er %3 loo' $ooth &+t !t h%$ %"3 !rre#+l%r!t!e$ o" !t$ $+rf%ce( /+e to th!$

re%$o" !t w!ll #!-e % d!ff+$ed reflect!o"(

Q) St%te the l%w$ of reflect!o"(

A"$: L%w$ of reflect!o":

,!) The %"#le of reflect!o" !$ %lw%3$ e;+%l to the %"#le of !!"c!de"ce(

,!!) The !"c!de"t r%3 the reflected r%3 %"d the "or%l to the reflect!-e $+rf%ce %t the *o!"t of !"c!de"ce

%ll l!e !" the $%e *l%"e(

Q?) /e$cr!&e %" %ct!-!t3 to $how th%t the !"c!de"t r%3 the reflected r%3 %"d the "or%l %t the *o!"t of

!"c!de"ce l!e !" the $%e *l%"e(

A"$: Pl%ce % *l%"e !rror o" the t%&le( T%'e % *%*er $heet %"d %'e % $%ll hole !" !t$ ce"tre( 2%'e

$+re th%t the l!#ht !" the roo !$ "ot &r!#ht( Hold the $heet "or%l to the t%&le( T%'e %"other $heet %"d

*l%ce !t o" the t%&le !" co"t%ct w!th the -ert!c%l !rror( /r%w % "or%l l!"e o" the $eco"d $heet fro

the !rror( Now l!#ht % torch o" the !rror thro+#h the $%ll hole $+ch th%t the r%3 of l!#ht f%ll$ o"

the "or%l %t the &otto of the !rror( 5he" the r%3 fro th!$ hole !$ !"c!de"t o" the !rror !t #et$

reflected !" % cert%!" d!rect!o"( Go+ c%" e%$!l3 o&$er-e the !"c!de"t r%3 reflected r%3 %"d the "or%l to

the !rror %t the *o!"t of !"c!de"ce o" the $heet *l%ced o" the t%&le( Th!$ $how$ th%t the !"c!de"t r%3the reflected r%3 %"d the "or%l to the $+rf%ce %t the *o!"t of !"c!de"ce %ll l!e !" the $%e *l%"e(

Q@) 0!ll !" the &l%"'$ !" the follow!"#(

,%) A *er$o" 1 !" fro"t of % *l%"e !rror $ee$ to &e .... .. %w%3 fro h!$ !%#e(

,&) If 3o+ to+ch 3o+r ........ e%r w!th 3o+r r!#ht h%"d !" fro"t of % *l%"e !rror !t w!ll &e $ee" !"

the !rror th%t 3o+r r!#ht e%r !$ to+ched w!th 3o+r .........(

,c) The $!4e of the *+*!l &ecoe$ ........ whe" 3o+ $ee !" d! l!#ht(

,d) N!#ht &!rd$ h%-e ......... co"e$ th%" rod$ !" the!r e3e$(

A"$: ,%) A *er$o" 1 !" fro"t of % *l%"e !rror $ee$ to &e .. .. %w%3 fro h!$ !%#e(

,O&ect d!$t%"ce %"d !%#e d!$t%"ce %re the $%e fro % *l%"e !rror( The !%#e of % *er$o" 1 !"

fro"t of % !rror !$ 1 &%c' to the !rror( He"ce the !%#e !$ 1 1 M %w%3 fro the *er$o"()


48/59

,&) If 3o+ to+ch 3o+r ..left.. e%r w!th 3o+r r!#ht h%"d !" fro"t of % *l%"e !rror !t w!ll &e $ee" !" the

!rror th%t 3o+r r!#ht e%r !$ to+ched w!th 3o+r .left h%"d.(

,Th!$ !$ &ec%+$e of l%ter%l !"-er$!o" of !%#e$ fored !" % *l%"e !rror()

,c) The $!4e of the *+*!l &ecoe$ ..l%r#e.. whe" 3o+ $ee !" d! l!#ht(

,I" d! l!#ht the %o+"t of l!#ht e"ter!"# the e3e !$ -er3 l!ttle( To !"cre%$e the %o+"t of l!#ht the

*+*!l e6*%"d$()

,d) N!#ht &!rd$ h%-e ..le$$.. co"e$ th%" rod$ !" the!r e3e$(

,N!#ht &!rd$ c%" $ee !" the "!#ht &+t "ot !" the d%3( The3 h%-e o" the!r ret!"% % l%r#e "+&er of rod

cell$ %"d o"l3 % few co"e$()

Q) A"#le of !"c!de"ce !$ e;+%l to the %"#le of reflect!o"(

,%) Alw%3$ ,&) Soet!e$

,c) U"der $*ec!%l co"d!t!o"$ ,d) Ne-er

A"$: ,%) The %"#le of !"c!de"ce !$ %lw%3$ e;+%l to the %"#le of reflect!o"( Th!$ !$ the f!r$t l%w of

reflect!o"(

Q8) I%#e fored &3 % *l%"e !rror !$

,%) -!rt+%l &eh!"d the !rror %"d e"l%r#ed(

,&) -!rt+%l &eh!"d the !rror %"d of the $%e $!4e %$ the o&ect(

,c) re%l %t the $+rf%ce of the !rror %"d e"l%r#ed(

,d) re%l &eh!"d the !rror %"d of the $%e $!4e %$ the o&ect(

A"$: ,&) I%#e fored &3 % *l%"e !rror !$ -!rt+%l &eh!"d the !rror %"d of the $%e $!4e %$ the

o&ect(The !%#e fored &3 % *l%"e !rror !$ of the $%e $!4e %$ the o&ect( The !%#e !$ fored &eh!"d the

!rror( The !%#e c%""ot &e o&t%!"ed o" % $cree"( He"ce !t !$ % -!rt+%l !%#e(

Q) /e$cr!&e the co"$tr+ct!o" of % '%le!do$co*e(

A"$: Co"$tr+ct!o" of % '%le!do$co*e:

Three rect%"#+l%r !rror $tr!*$ of d!e"$!o"$ 1?c c ,l &) %re o!"ed to#ether to for % *r!$

$fig a%Th!$ *r!$ !$ f!6ed !"to % c!rc+l%r c%rd&o%rd t+&e( The c!rc+l%r c%rd&o%rd t+&e $ho+ld &e

$l!#htl3 lo"#er th%t the *r!$ $fig b%( Th!$ c!rc+l%r t+&e !$ "ow clo$ed %t o"e e"d w!th % c%rd&o%rd d!$c(

Th!$ d!$c h%$ % hole !" !t thro+#h wh!ch we c%" $ee $fig c%(At the other e"d of the c!rc+l%r t+&e % *l%"e

#l%$$ *l%te !$ f!6ed( It !$ !*ort%"t th%t th!$ #l%$$ *l%te to+che$ the *r!$ !rror$( O" th!$ #l%$$ *l%te

$e-er%l $%ll %"d &ro'e" *!ece$ of colo+red #l%$$ %re *l%ced( Th!$ e"d !$ "ow clo$ed &3 % ro+"d #l%$$

*l%te %llow!"# e"o+#h $*%ce for the colo+red #l%$$ *!ece$ to o-e $fig d%


49/59

Q1D) /r%w % l%&elled $'etch of the h+%" e3e(

A"$:

Q11) +r!t w%"ted to *erfor Act!-!t3 1@(8 +$!"# % l%$er torch( Her te%cher %d-!$ed her "ot to do $o(

C%" 3o+ e6*l%!" the &%$!$ of the te%cher>$ %d-!ce

A"$: L%$er l!#ht !$ h%rf+l for the h+%" e3e$ &ec%+$e !t$ !"te"$!t3 !$ -er3 h!#h( It c%" c%+$e d%%#e

to the ret!"% %"d le%d to &l!"d"e$$( He"ce !t !$ %d-!$%&le "ot to loo' %t % l%$er &e% d!rectl3(

Q1) To *rotect o+r e3e$ the #!-e" *o!"t$ $ho+ld &e t%'e" !"to %cco+"t:

,!) F!$!t %" e3e $*ec!%l!$t re#+l%rl3(

,!!) A-o!d re%d!"# !" d! l!#ht %"d -er3 &r!#ht l!#ht(

,!!!) A-o!d d!rect e6*o$+re of $+"l!#ht to the e3e(

,!-) Cle%" 3o+r e3e$ w!th cold w%ter ;+!c'l3 !f d+$t *%rt!cle$ or $%ll !"$ect$ e"ter 3o+r e3e( /o "ot

r+& 3o+r e3e$(

,-) 2%!"t%!" % d!$t%"ce of %t le%$t ? c &etwee" the &oo' %"d 3o+r e3e$ wh!le re%d!"#(

Q17) 5h%t !$ the %"#le of !"c!de"ce of % r%3 !f the reflected r%3 !$ %t %" %"#le of D to the !"c!de"t

r%3

A"$: If the reflected r%3 !$ %t %" %"#le of D to the !"c!de"t r%3 the" the %"#le of !"c!de"ce !$ ? (

Accord!"# to the l%w of reflect!o" the %"#le of !"c!de"ce !$ e;+%l to the %"#le of reflect!o"( Therefore

the %"#le of !"c!de"ce %"d the %"#le of reflect!o" &oth %re M ?(

Q1) How %"3 !%#e$ of % c%"dle w!ll &e fored !f !t !$ *l%ced &etwee" two *%r%llel *l%"e !rror$

$e*%r%ted &3 D c


50/59

A"$: I"f!"!te or +lt!*le !%#e$ of the c%"dle w!ll &e fored &ec%+$e of +lt!*le reflect!o"$ &etwee"

the !rror$( 5he" two !rror$ %re *l%ced *%r%llel to e%ch other the" !"f!"!te "+&er$ of !%#e$ %re

fored(

Q1?) Two !rror$ eet %t r!#ht %"#le$( A r%3 of l!#ht !$ !"c!de"t o" o"e %t %" %"#le of 7D %$ $how" !"

0!#( 1@(1( /r%w the reflected r%3 fro the $eco"d !rror(

A"$: The f!r$t l%w of reflect!o" !$ +$ed to o&t%!" the *%th of reflected l!#ht(

It c%" &e o&$er-ed th%t the #!-e" r%3 of l!#ht w!ll reflect fro the $eco"d !rror %t %" %"#le @D(

Q1@) Booho $t%"d$ %t A +$t o" the $!de of % *l%"e !rror %$ $how" !" 0!#( 1@(D( C%" he $ee h!$elf

!" the !rror Al$o c%" he $ee the !%#e of o&ect$ $!t+%ted %t P Q %"d R

A"$: A *l%"e !rror for$ % -!rt+%l !%#e &eh!"d the !rror( The !%#e !$ %$ f%r &eh!"d the !rror %$

the o&ect !$ !" fro"t of !t( A c%""ot $ee h!$ !%#e &ec%+$e the le"#th of the !rror !$ too $hort o" h!$

$!de( Howe-er he c%" $ee the o&ect$ *l%ced %t *o!"t$ P %"d Q &+t c%""ot $ee the o&ect *l%ced %t

*o!"t R ,%$ $how" !" the #!-e" f!#+re)(

Q1) ,%) 0!"d o+t the *o$!t!o" of the !%#e of %" o&ect $!t+%ted %t A !" the *l%"e !rror ,0!#( 1@(1)(

,&) C%" P%hel! %t B $ee th!$ !%#e

,c) C%" Booho %t C $ee th!$ !%#e

,d) 5he" P%hel! o-e$ fro B to C where doe$ the !%#e of A o-e


51/59

A"$: ,%) I%#e of the o&ect *l%ced %t A !$ fored &eh!"d the !rror( The d!$t%"ce of the !%#e fro

the !rror !$ e;+%l to the d!$t%"ce of A fro the !rror( I%#e of A !$ $how" !" the #!-e" f!#+re(

,&) Ge$( P%hel! %t B c%" $ee th!$ !%#e(

,c) Ge$( Booho %t C c%" $ee th!$ !%#e(

,d) I%#e of the o&ect %t A w!ll "ot o-e( It w!ll re%!" %t the $%e *o$!t!o" whe" P%hel! o-e$

fro B to C(


52/59

A"$: ,%) Ph%$e$ of the oo" occ+r &ec%+$e we c%" $ee o"l3 th%t *%rt of the oo" wh!ch reflect$ l!#ht

tow%rd$ +$(

2oo" doe$ "ot *rod+ce !t$ ow" l!#ht( 5e %re %&le to $ee the oo" &ec%+$e the $+"l!#ht f%ll!"# o" !t

#et$ reflected tow%rd$ +$( Th+$ we $ee o"l3 th%t *%rt of the oo" fro wh!ch the l!#ht of the $+" #et$

reflected tow%rd$ +$(

Q) 0!ll !" the &l%"'$:

,%) The *l%"et wh!ch !$ f%rthe$t fro the $+" !$ .........(

,&) The *l%"et wh!ch %**e%r$ redd!$h !" colo+r !$ .........(

,c) A #ro+* of $t%r$ th%t %**e%r to for % *%tter" !" the $'3 !$ '"ow" %$ % .. .........(

,d) A cele$t!%l &od3 th%t re-ol-e$ %ro+"d % *l%"et !$ '"ow" %$ % .........(

,e) Shoot!"# $t%r$ %re %ct+%ll3 "ot .........(

,f) A$tero!d$ %re fo+"d &etwee" the or&!t$ of ........ .. %"d .........(

A"$: ,%) The *l%"et wh!ch !$ f%rthe$t fro the $+" !$ ..Ne*t+"e..(

A"$: ,&) The *l%"et wh!ch %**e%r$ redd!$h !" colo+r !$ ..2%r$..(

A"$: ,c) A #ro+* of $t%r$ th%t %**e%r to for % *%tter" !" the $'3 !$ '"ow" %$ % ..co"$tell%t!o"..(

A"$: ,d) A cele$t!%l &od3 th%t re-ol-e$ %ro+"d % *l%"et !$ '"ow" %$ % $%tell!te.(

A"$: ,e) Shoot!"# $t%r$ %re %ct+%ll3 "ot $t%r$ ..(

,Shoot!"# $t%r$ %re "ot $t%r$ the3 %re eteor$)

A"$: ,f) A$tero!d$ %re fo+"d &etwee" the or&!t$ of ..2%r$ .. %"d ..J+*!ter(

,A$tero!d$ occ+*3 % l%r#e #%* &etwee" the or&!t$ of 2%r$ %"d J+*!ter)

Q?) 2%r' the follow!"# $t%tee"t %$ tr+e ,T) or f%l$e ,0)(,%) Pole $t%r !$ % e&er of the $ol%r $3$te( , )

,&) 2erc+r3 !$ the $%lle$t *l%"et of the $ol%r $3$te( , )

,c) Ur%"+$ !$ the f%rthe$t *l%"et !" the $ol%r $3$te( , )

,d) INSAT !$ %" %rt!f!c!%l $%tell!te( , )

,e) There %re "!"e *l%"et$ !" the $ol%r $3$te( , )

,f) Co"$tell%t!o" Or!o" c%" &e $ee" o"l3 w!th % tele$co*e( , )

A"$: ,%) 0%l$e

St%r$ %re "ot % e&er of the $ol%r $3$te( The $+" %"d the cele$t!%l &od!e$ re-ol-!"# %ro+"d !t for

the $ol%r $3$te(

A"$: ,&) Tr+e

2erc+r3 !$ the $%lle$t *l%"et of the $ol%r $3$te(

A"$: ,c) 0%l$e

Ne*t+"e !$ the f%rthe$t *l%"et !" the $ol%r $3$te(

A"$: ,d) Tr+e

INSAT !$ %" %rt!f!c!%l $%tell!te(

A"$: ,e) 0%l$e

There %re e!#ht *l%"et$ !" the $ol%r $3$te(


53/59

The3 %re 2erc+r3 Fe"+$ E%rth 2%r$ J+*!ter S%t+r" Ur%"+$ %"d Ne*t+"e(

A"$: ,f) 0%l$e

Co"$tell%t!o" Or!o" c%" &e $ee" d+r!"# w!"ter$ %ro+"d l%te e-e"!"#$( It !$ o"e of the o$t %#"!f!ce"t

co"$tell%t!o"$ !" the $'3 -!$!&le to the "%'ed e3e$(

Q@) 2%tch !te$ !" col+" A w!th o"e or ore !te$ !" col+" B(

A B

,!) I""er *l%"et$ ,%) S%t+r"

,!!) O+ter *l%"et$ ,&) Pole $t%r

,!!!) Co"$tell%t!o" ,c) re%t Be%r

,!-) S%tell!te of the E%rth ,d) 2oo"

,e) E%rth

,f) Or!o"

,#) 2%r$

A"$:

A B

,!) I""er *l%"et$ ,#) ,e) 2%r$ E%rth

,!!) O+ter *l%"et$ ,%) S%t+r"

,!!!) Co"$tell%t!o" ,c) ,f) re%t Be%r Or!o"

,!-) S%tell!te of the E%rth ,d) 2oo"

Q) I" wh!ch *%rt of the $'3 c%" 3o+ f!"d Fe"+$ !f !t !$ -!$!&le %$ %" e-e"!"# $t%r

A"$: Fe"+$ %**e%r$ !" the we$ter" $'3 %fter $+"$et %"d !$ c%lled the e-e"!"# $t%r(

Q8) N%e the l%r#e$t *l%"et of the $ol%r $3$te(

A"$: The l%r#e$t *l%"et of the $ol%r $3$te !$ J+*!ter(

Q) 5h%t !$ % co"$tell%t!o" N%e %"3 two co"$tell%t!o"$(A"$: A co"$tell%t!o" !$ % #ro+* of $t%r$ th%t for % reco#"!$%&le *%tter" !" the $'3(

The two well '"ow" co"$tell%t!o"$ %re Ur$% 2%or %"d Or!o"(

Q1D) /r%w $'etche$ to $how the rel%t!-e *o$!t!o" of *ro!"e"t $t%r$ !" ,%) Ur$% 2%or %"d ,&) Or!o"


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A"$: ,%) Ur$% 2%or %**e%r$ l!'e % &!# d!**er( There %re three &r!#ht $t%r$ !" the h%"dle %"d fo+r $t%r$

!" the &owl of the d!**er ,%$ $how" !" the #!-e" f!#+re)(

,&) Or!o" %**e%r$ l!'e % h+"ter( Three &r!#ht $t%r$ %**e%r !" the &elt wh!le f!-e &r!#ht $t%r$ %re

%rr%"#ed !" the for of % ;+%dr!l%ter%l ,%$ $how" !" the #!-e" f!#+re)(

Q11) N%e two o&ect$ other th%" *l%"et$ wh!ch %re e&er$ of the $ol%r $3$te(

A"$: ,!) A$tero!d$

A collect!o" of % l%r#e "+&er of $%ll o&ect$ #%$e$ %"d d+$t %re re-ol-!"# %ro+"d the $+"( The3

occ+*3 % l%r#e #%* &etwee" the or&!t$ of 2%r$ %"d J+*!ter( Howe-er the$e %re "ot *l%"et$( The$e

cele$t!%l o&ect$ %re '"ow" %$ %$tero!d$(

,!!) 2eteor$

2eteor$ %re $%ll cele$t!%l o&ect$ th%t %re $ee" %$ &r!#ht $tre%'$ of l!#ht !" the $'3( The3 &r+"t o+t o"

e"ter!"# the E%rth>$ %to$*here &ec%+$e of the he%t *rod+ced &3 fr!ct!o"( Th!$ re$+lt$ !" &r!#ht $tre%'$

!" the $'3( The3 %re "ot *l%"et$(

Q1) E6*l%!" how 3o+ c%" loc%te the Pole St%r w!th the hel* of Ur$% 2%or(

Answer

Dis$'ssion

I" order to loc%te the Pole $t%r !" the $'3 f!r$t of %ll Ur$% 2%or or B!# /!**er co"$tell%t!o" +$t &e

loc%ted( The &owl of the B!# /!**er co"$!$t$ of fo+r &r!#ht $t%r$ ,%$ $how" !" the #!-e" f!#+re)(

Co"$!der two $t%r$ %t the e"d of th!$ &owl( Now dr%w %" !%#!"%r3 $tr%!#ht l!"e tow%rd$ the Norther"

d!rect!o" co""ect!"# the$e two $t%r$ ,%$ $how" !" the #!-e" f!#+re)(
http://cbse.meritnation.com/study-online/solution/Science/s5fc8p3AAMAyuosobPpSuA_e__e_#answerhttp://cbse.meritnation.com/study-online/solution/Science/s5fc8p3AAMAyuosobPpSuA_e__e_#discussionhttp://cbse.meritnation.com/study-online/solution/Science/s5fc8p3AAMAyuosobPpSuA_e__e_#answerhttp://cbse.meritnation.com/study-online/solution/Science/s5fc8p3AAMAyuosobPpSuA_e__e_#discussion


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Th!$ !%#!"%r3 l!"e eet$ % $t%r c%lled the Pole St%r( The le"#th of the !%#!"%r3 l!"e fro the &owl !$

%&o+t f!-e t!e$ the d!$t%"ce &etwee" the two $t%r$ of the &owl(

Q17) /o %ll the $t%r$ !" the $'3 o-e E6*l%!"(

Answer

Dis$'ssion

No( The E%rth rot%te$ fro 5e$t to E%$t o" !t$ %6!$( He"ce %ll $t%r$ !" the $'3 ,e6ce*t the Pole $t%r)

%**e%r to o-e fro E%$t to 5e$t( 5!th refere"ce to the E%rth the Pole $t%r doe$ "ot %**e%r to o-e

!" the $'3 &ec%+$e !t !$ loc%ted %&o-e the %6!$ of rot%t!o" of the E%rth !" the "orth d!rect!o"( It %**e%r$

to re%!" $t%t!o"%r3 %t % *o!"t !" the $'3(

Q1) 5h3 !$ the d!$t%"ce &etwee" $t%r$ e6*re$$ed !" l!#ht 3e%r$ 5h%t do 3o+ +"der$t%"d &3 the

$t%tee"t th%t % $t%r !$ e!#ht l!#ht 3e%r$ %w%3 fro the E%rth

Answer

Dis$'ssion

The d!$t%"ce of the $t%r$ fro the E%rth %"d the d!$t%"ce &etwee" the $t%r$ %re -er3 l%r#e( It !$

!"co"-e"!e"t to e6*re$$ the$e d!$t%"ce$ !" '!loeter ,')( Th+$ the$e l%r#e d!$t%"ce$ %re e6*re$$ed !"

l!#ht 3e%r$( O"e l!#ht 3e%r !$ the d!$t%"ce tr%-elled &3 l!#ht !" o"e 3e%r( O"e l!#ht 3e%r !$ e;+%l to (@

1D1'(

A $t%r !$ loc%ted e!#ht l!#ht 3e%r$ %w%3 fro the E%rth( Th!$ e%"$ th%t the d!$t%"ce &etwee" the $t%r

%"d the E%rth !$ e;+!-%le"t to the d!$t%"ce tr%-elled &3 l!#ht !" e!#ht 3e%r$ !(e( % $t%r !$ loc%ted 8 ,(@ 1D1) M (@ 1D17' %w%3 fro the E%rth(

Q1?) The r%d!+$ of J+*!ter !$ 11 t!e$ the r%d!+$ of the E%rth( C%lc+l%te the r%t!o of the -ol+e$ of

J+*!ter %"d the E%rth( How %"3 E%rth$ c%" J+*!ter %ccood%te

Answer

Dis$'ssion

E%rth %"d J+*!ter c%" &e co"$!dered %$ two $*here$ w!th r%d!! R%"dR&re$*ect!-el3( !-e" th%t the

r%d!+$ of J+*!ter !$ 11 t!e$ the r%d!+$ of the E%rth(

Th+$R& M 11R
http://cbse.meritnation.com/study-online/solution/Science/q8fv_p_dityI6VBlttdJR5vw_e__e_#answerhttp://cbse.meritnation.com/study-online/solution/Science/q8fv_p_dityI6VBlttdJR5vw_e__e_#discussionhttp://cbse.meritnation.com/study-online/solution/Science/GLcju2dLvmHrGw6BsSWvXg_e__e_#answerhttp://cbse.meritnation.com/study-online/solution/Science/GLcju2dLvmHrGw6BsSWvXg_e__e_#discussionhttp://cbse.meritnation.com/study-online/solution/Science/uiXzjmQHogP527jQmxZd_s_Q_e__e_#answerhttp://cbse.meritnation.com/study-online/solution/Science/uiXzjmQHogP527jQmxZd_s_Q_e__e_#discussionhttp://cbse.meritnation.com/study-online/solution/Science/q8fv_p_dityI6VBlttdJR5vw_e__e_#answerhttp://cbse.meritnation.com/study-online/solution/Science/q8fv_p_dityI6VBlttdJR5vw_e__e_#discussionhttp://cbse.meritnation.com/study-online/solution/Science/GLcju2dLvmHrGw6BsSWvXg_e__e_#answerhttp://cbse.meritnation.com/study-online/solution/Science/GLcju2dLvmHrGw6BsSWvXg_e__e_#discussionhttp://cbse.meritnation.com/study-online/solution/Science/uiXzjmQHogP527jQmxZd_s_Q_e__e_#answerhttp://cbse.meritnation.com/study-online/solution/Science/uiXzjmQHogP527jQmxZd_s_Q_e__e_#discussion


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Fol+e of % $*here of r%d!+$ r!$ #!-e" %$

Fol+e of the E%rth

A"d -ol+e of J+*!ter

The r%t!o of the -ol+e$ of J+*!ter %"d E%rth

He"ce th!$ r%t!o $+##e$t$ th%t J+*!ter c%" %ccood%te 1771 "+&er of E%rth$ w!th!" !t(

Q1@) Booho %de the follow!"# $'etch ,0!#( 1() of the $ol%r $3$te( I$ the $'etch correct If "ot

correct !t(

'ig ()*+

Answer

Dis$'ssion

Pl%"et$ of the $ol%r $3$te !" $e;+e"ce of the!r d!$t%"ce$ fro the $+" %re: 2erc+r3 Fe"+$ E%rth

2%r$ J+*!ter S%t+r" Ur%"+$ %"d Ne*t+"e( Therefore Booho>$ $'etch of the $ol%r $3$te !$ "ot

correct &ec%+$e he h%$ !"terch%"#ed the *o$!t!o"$ of 2%r$ %"d Fe"+$ %"d %l$o the *o$!t!o"$ of Ur%"+$

%"d Ne*t+"e( Al$o he h%$ $how" the A$tero!d &elt !" the #%* &etwee" the or&!t$ of J+*!ter %"d S%t+r"(

Th!$ !$ "ot correct( The %$tero!d &elt !$ loc%ted &etwee" the or&!t$ of 2%r$ %"d J+*!ter( The correct

$'etch of the $ol%r $3$te !$ $how" !" the #!-e" f!#+re(
http://cbse.meritnation.com/study-online/solution/Science/OnN7edBGapiqfjzKEwXxiw_e__e_#answerhttp://cbse.meritnation.com/study-online/solution/Science/OnN7edBGapiqfjzKEwXxiw_e__e_#discussionhttp://cbse.meritnation.com/study-online/solution/Science/OnN7edBGapiqfjzKEwXxiw_e__e_#answerhttp://cbse.meritnation.com/study-online/solution/Science/OnN7edBGapiqfjzKEwXxiw_e__e_#discussion


57/59


58/59

A"$: P+re %!r co"t%!"$ %ro+"d 8 "!tro#e" 1 o63#e" %"d D(D7 c%r&o" d!o6!de( Other #%$e$

$+ch %$ %r#o" eth%"e o4o"e %"d w%ter -%*o+r$ %re %l$o *re$e"t !" $%ll ;+%"t!t!e$( 5he" th!$

co*o$!t!o" of %!r !$ %ltered &3 the %dd!t!o" of h%rf+l $+&$t%"ce$ or #%$e$ $+ch %$ "!tro#e" d!o6!de

$+l*h+r d!o6!de c%r&o" o"o6!de %"d *%rt!c+l%te %tter the" the %!r !$ $%!d to &e *oll+ted(

Q@) E6*l%!" c!rc+$t%"ce$ le%d!"# to %c!d r%!"( How doe$ %c!d r%!" %ffect +$

A"$: B+r"!"# of fo$$!l f+el$ $+ch %$ co%l %"d d!e$el rele%$e$ % -%r!et3 of *oll+t%"t$ $+ch %$ $+l*h+r

d!o6!de %"d "!tro#e" d!o6!de !"to the %to$*here( The$e *oll+t%"t$ re%ct w!th w%ter -%*o+r$ *re$e"t !"

the %to$*here to for $+l*h+r!c %c!d %"d "!tr!c %c!d re$*ect!-el3( The$e %c!d$ coe dow" w!th the

r%!" there&3 re$+lt!"# !" %c!d r%!"(

Effect$ of %c!d r%!":

,!) Ac!d r%!"$ d%%#e cro*$(

,!!) Ac!d r%!"$ corrode &+!ld!"#$ %"d $tr+ct+re$ e$*ec!%ll3 tho$e %de of %r&le $+ch %$ T% 2%h%l(

Q) 5h!ch of the follow!"# !$ "ot % #ree"ho+$e #%$

,%) C%r&o" d!o6!de

,&) S+l*h+r d!o6!de

,c) 2eth%"e

,d) N!tro#e"

A"$: ,d) N!tro#e"

Q8) /e$cr!&e the =ree"ho+$e Effect> !" 3o+r ow" word$(

A"$: ree"ho+$e effect %3 le%d to #lo&%l w%r!"# !(e( %" o-er%ll !"cre%$e !" the %-er%#e

te*er%t+re of the E%rth( ree"ho+$e effect !$ c%+$ed &3 #ree"ho+$e #%$e$( E6%*le$ of #ree"ho+$e#%$e$ !"cl+de c%r&o" d!o6!de eth%"e %"d w%ter -%*o+r( 5he" $ol%r r%d!%t!o"$ re%ch the E%rth $oe

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28549300 Answer Book VIII Science