XII Phy Value BasedQuestion 2014 - 15

8/9/2019 XII Phy Value BasedQuestion 2014 - 15

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VALUE BASED QUESTIONS

ELECTROSTATICS

1. Savitha has a paisa coin made up of AI-Mg alloy and weighs 0.75g. It

has a squae shape and its diagonal measues 17 mm. It is electicallyneutal and contains equal amounts of positive and negative chages.

!a" #eating the paisa coins made up of only Al$ %nd the magnitudeo equal num&es of positive and negative chages. 'hat conclusiondo you daw fom this magnitude(!&" It is electically neutal and contains equal amounts of positiveand negative chage of magnitude )*.+ ,. Suppose that these equalchages wee concentated in two point chages sepaated &y !i" 1 cm!1/ diagonal of the one paisa coin" !ii" 100m !2length of a long&uildings" and !ii" 103m !adius of the eath". 4ind the foce on each

such point chage in each of the thee cases. 'hat do you concludefom these esults(

/. A man tavelling in a ca duing heavy ain and thundestom sees a&oy standing unde a tee. e immediately stops his ca and as,s the &oy toget inside the ca and saves him fom a possi&le natual calamity.

!a" 'hat dange did the &oy have while standing unde the teeduing the thundestom(!&" ow is it safe inside the ca duing such weathe(!c" 'hat accoding to you ae the values displayed &y the man tohelp the &oy(

!d" 6ive anothe eample fom eveyday life situations whichepesent display of simila values

). i8ay was pepaing an electonic po8ect fo science ehi&ition. eequied a capacitance of /94 having a capacity to opeate unde 1 ,potential. e went to a shop to puchase it. Shop,eepe was having only194 capacitos of *00 ating. i8ay calculated minimum num&es ofcapacitos of 194 so that he could aange them to fom a capacito of /94value.

!a" 'hat values do you 8udge in i8ay(!&" Show the calculations done &y i8ay.

*. :uing a thundestom ;ohan and his fiends wee in the middle of a8ungle. is fiends wee standing unde a tee. ;ohan advised them not tostand thee. ;athe he suggested that they move &ac, to the &us. eeplained them that they ae safe inside the &us due to electostaticshielding.

!a" 'hat ae the values ehi&ited &y ;ohan(!&"'hat is electostatic shielding(


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5. 6eeta has dy hai. A com& an though he dy hai attact small &itsof pape. She o&seves thatpeiment to them. All the 8unio s feel vey happy and tell he thatthey will also loo, fo such inteesting things in natue and ty to %nd theanswes .she succeeds in foming a Science lu& in he school.

!a" 'hat accoding to you ae the values displayed 6eeta(

3. An eldely woman went alone to the ;egista?s o@ce to dis&usehe popety. 'hen she enquied in the o@ce she was as,ed to get a eocopy of the document which wo,s unde electostatic induction. #he eoshop was fa away and acoss the oad. She too, the help of the passe-&y

and got he eo done. !a" 'hat values did the passe-&y have(!&" ow does a neutal &ody get chaged &y electostatic induction(

/

7. ;am and Shyam went to the tade fai. #hey wee &usy in acowded cone whee &alloons wee sold. A child was seen tou&ling hispaent and cying fo something. Bn seeing this ;am went to the child andsaid that he would pefom a tic, with &alloons. ;am too, two &alloons andShyam helped him to inCate and tie. 'hen the &alloons wee u&&ed with thesweate he was weaing they wee attacted. 'hen ta,en neae to wallthe &alloons got stuc,. #he child en8oyed and stopped cying.

!a" 6ive two values of ;am and Shyam.!&" ow did the &alloons get attacted( 'ill they epel also(

+.M. Dishan is a fame who was staying happily in a hut made of hey andleafy oof. It is easy fo him to enovate his home with new leaves evey yeaas the good quality palm leaves he get fee of cost and it isenvionment fiendly. Most ofthe village peopleae satis%ed with the same

type of huts thee. Eut one day duing heavy lightning many of the hutswee &unt to ashes and people wee sad and disappointed. M. Se,ha wo,sin electicity depatment and has good ,nowledge of cuent aFais. e sooneached the spot along with his fiends and paci%ed them and madeaangements fo thei comfota&le stay. #he vey net day the team couldeect many lightning conductos and few cavities of metal conductos andmade


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awaeness to the villages a&out lightning and the use of things installedthee.

!a" 'hat accoding to you ae the values displayed &y M. Se,ha andhis fiends to help M. Dishan andthe village people(!&" 'hat is the pinciple &ehind wo,ing of a lightning conducto(

!c" Also &y applying 6auss theoem show that net electic %eld insidethe metallic cavity is Geo.

H. Aun had to epaint his ca when he was eminded &y the ca company fohis egula ca sevice. e told them to do spay painting of mountain dewcolou. #he company also eplied that they usually pefom spay paintingonly as wastage is minimiGed and even painting achieved.

!a" 'hat values did the ca sevice company have(!&" If spay painting is done &y electostatic induction how is even

painting achieved(

10. In A,ash?s classoom the fan a&ove the teache was unning vey slowly.:ue to which his teache was sweating and was estless and tied. All hisclassmates wanted to ectify this. #hey called fo an electician who cameand changed the capacito only afte which the fan stated unning fast.

!a" 'hat values did A,ash and his classmates have(!&" 'hat enegy is stoed in the capacito and whee(

11. Ashwin as,ed his =hysics teache why voltmete galvanomete andammete ae ,ept in a cavity inspite of its oute coveing &eing made of aninsulato.

!a" 'hat values did Ashwin have(!&" >plain 4aaday?s cage o electostatic shielding.

Current Electricity.

J 1.Ms #ha,u left he ca headlights on while pa,ing. #he ca would not

stat when she etuned.

Seeing he stuggle Mohit went to he help.


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teminals of the ca &attey to get the engine stated. Bnce the engine was

unning he disconnected

this second &attey. #his is ,nown as KLM= S#A;#I


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J ). ;ahul and ;ohit &ought an electic ion. #hey had a / pin plug. ;ahul

was ,een to stat using the

new ion with the / pin plug. oweve ;ohit insisted that they &uy a ) pin

plug &efoe using it. ;ahul

got angy. ;ohit patiently eplained the impotance of using a ) pin plug and

the eathing wie. e said

that if the metallic &ody of the ion came in contact with the live wie at //0

volts they would get an

electic shoc,. If eathed the cuent would go to the eath and the potential

of the metallic &ody

would not ise. #he ion would then &e safe to use. eaing ;ohit ;ahul

calmed down and ageed.

O 'hat values did ;ahul and ;ohit have(

O 'hich has geate esistance P 1 D watt electic heate o 100 watt electic

&ul& &oth

ma,ed //0 volts(

J *.Sachin had gone to meet his gandfathe who was staying in a village. Inthe evening they wee

&oth watching # when suddenly the lights went oF. 6andfathe told Sachin

that the fuse must have

&lown up as all thei neigh&os had electicity. Quc,ily Sachin ,new how to

change a fuse. is

gandfathe was happy and told him that if he had &een alone he would

have had to spend the night in

the da, without a fan. Sachin felt and made up his mind to eplace the fuse

with a cicuit &ea,e which

uses a solenoid with a coe so that his gandfathe would not have any

po&lems in futue.

O 'hat values did Sachin have(


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stop him &ut he did not listen. #he moment he touched the inteio pat of

the fun he fell down &ecause of an electic shoc,. All fiends wee scaed as

to what has happened as the powe supply was aleady switched oF.

!i" 'hat negative tait do you thin, has &een displayed &y mang(!ii"'hat

could &e the possi&le cause nof electic shoc,(!iii" 'ite epession ofcuent and emf of the component used in fan with phase diFeence.

".In


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epeatedly fo -ay eamination.;ahim was hestitant fo the same.e told

the docto that they had &een taught that the epeated eposue to -ays

would &e hamful.#he docto told him not to woy as he ,new things

&ette.;ead the a&ove passage and answe the following questionJ!i"4o what

pupose -ay eamination of a patient is equied &y a docto(!ii"Is the

docto ight to as, ;ahim fo epeated -ay eamination(!iii"'hat do you

lean fom this study(!#he docto is not epected to misguide a patient fo

etaneous consideations.4o a patient the docto is net only to 6od.e

should always povide a fai teatement"

) posue of young ,ids to

hashe teatement is dangeous and it must &e avoided.

* :uing :iwali festival;a8ende &ought a new micowave oven in his

house and told his wife Sai,a to use the same caefully .e also told he that

micowave oven is to &e used fo slow heating of the vegeta&les and foodaticles upto modeate tempeatue as that will peseve the food values

.#he fast coo,ing of food items at high tempeatues will ta,e away the food

values fom the food.4uthethe vegeta&les o food items to &e heated in

oven ae to &e ,ept in a pocelain vessel and not in a metallic vessel.;ead

the a&ove paagaph and answe the following questionJ!i"'hat is the &asic

pinciple of wo,ing of micowave oven(!ii"'hy is it advised to use pocelain

vessel fo heating the food items in micowave oven(!iii"'hat &asic values

do you lean fom this stuny(!8ust li,e slow and low heating of food peseve

the food values &ut fast and intense heating destoy itsudden ises in day to

day life is also hamfull.Insteadsteady ises ae appecia&le.

5 4ou pesons went on an ecusion on a hill top whee tempeatue was

quite low.Bne of them fell sic,.#he othe pesons put a &lan,et on

himcollected the pieces of dy wood and ignited %e in his vicinity.Afte

sometime the sic, peson felt &ette.;ead the a&ove passage and answe the

following questionJ!i"'hat ae the type of ays coming fom %e(!ii"'hy did


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the sic, peson feel &ette while seating nea the %e(!iii"'hat &asic values

do you lean fom this study(! 'e lean that pesence of mind and pope

use of the things availa&le help to save a di@cult situation."

3 >lectomagnetic wave have wide ange of wavelengths stating fom 10-

1*m to 10)m.#he em wave of diFeent wavelength ae used fo diFeentpuposes.#he y-ays which have lowest wavelength ae most enegetic

electomagnetic waves and adiowaves which have lagest wavelength ae

least enegetic.;ead the a&ove passage and answe the following questionJ

!i"'hat ae the most enegetic waves -ays o ulta violet ays(!ii"'hy ae

the adio waves not used to detect factue in the &ones of a human &ody

when they can delive a message at lage distance (!iii"'hat ae the &asic

values displayed &y a&ove study(!8ust as diFeent e.m wave have diFeent

applications depending on thei wavelength in the same way evey peson

have diFeent qualities which ma,e him suita&le fo diFeent

puposes%elds.#he aim of a teache o manage is to identify the quality in

diFeent childenpesons and put them to thei &est use accodingly."

7 A man is unning with a magnet in his hand .!i"'ill the em wave &e

geneated in the a&ove activity(!ii"'ill he see the wave if geneated(

!iii"'hat do you lean fom this activity.!the fequency of the wave geneated

depend on speed of the man.'e lean that in eveyday life also in what way

o whateve we doits eFect may not &e in visi&le egion &ut it aFects in the

same way.#hee is a de%nite cause of evey eFect.'e should thin, twice

&efoe ta,ing any step."&y a docto(!ii"Is the docto ight to as, ;ahim foepeated -ay eamination(!iii"'hat do you lean fom this study(!#he

docto is not epected to misguide a patient fo etaneous onsideations.4o

a patient the docto is net only to 6od.e should always povide a fai

teatement"

+.Sa&ella used an induction stove and eplains to he neigh&o that due to

shotage of Q=6 one must utiliGe othe souces that ae availa&le to poduce

heat enegy$ &eing a =hysics teache Isa&ella eplains that the Bil

companies ae tying thei &est to meet the demands fo Q=6 and that as a

good citiGen one must use othe souces wheeve feasi&le. Isa&ella uses aninduction stove having a value of 7 inducto and the Cow of cuent is fom

10Ato 7A in H 10-/seconds. In the a&ove what is the quality you %nd in the

=hysics teache(alculate the emf geneated in the a&ove( !ANS concen

fo the nation cost economic attitude shaing ,nowledge R &" e -Q

dI dt /)).)"


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H.A woman and he daughte of class II in D wee in the ,itchen

pepaing a feast fo visitos using the new micowave oven puchased

last evening. Suddenly the daughte noticed spa,s inside the oven

and unplugs the connection afte switching it oF. She found that inside

the micowave oven a metallic containe had &een ,ept to coo,

vegeta&le. She infoms he mothe that no metallic o&8ect must &e used

while coo,ing in micowave oven and eplains the easons fo the

same.a" 'hat attitude of the daughte inspies you(&" 6ive anothe use of a micowave ovenc" #he fequency of micowave is ) 1011 G. alculate its

wavelength.!ANS =esence of mind Dnowledge of su&8ect$ &" used in

telecommunication$ R c" U c !) 1011"" !) 10+". 10-).10.6opal visits his fiend


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5" ai ead in news that optical %&e has evolutioniGed the telephone

industy. e as,ed the teache on the net day how the statement is coect.

#he teache has given a satis%ed answe.

a" 'hat values the &oy and physics teache has shown(

&" Bn what pinciple the optical %&e wo,s(

%AVE O(TICS

J 1. A child is o&seving a thin %lm such as a laye of oil on wate show

&eautiful colous when illuminated &y while light. e feels happy and

supised to see this. is teache eplains him the eason &ehind it .#he childthen gives an eample of speading of ,eosene oil on wate to pevent

malaia and dengue.

O 'hat value was displayed &y his teache (

O


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the the intensity of emegent light when the aes of &oth wee

pependicula one of the =olaoids fell down and &o,e .Bne student

immediately went to infom it to the =hysics teache the othe stopped him.

O 'hich value is displayed &y the %st student (

O 'hat would &e the epected esult when the aes of &oth wee

pependicula (

!i" alue P;esponsi&le Sincee honest.

!ii" the intensity of emegent light is minimum.

*. ;ohan o&seved that thin %lms such as soap &u&&le a thin laye of oil on

wate show &eautiful colous when illuminated &y white light. e felt happy

and supised to see that. e went to his physics teache to undestand the

eason &ehind it. #he teache eplained him that a thin %lm of oil spead ovewate shows intefeence of light due to the intefeence &etween the light

waves eCected &y the lowe and uppe sufaces of the %lm on

undestanding this phenomena well ;ohan then gave an eample of thin

%lm of ,eosene oil which is spead ove wate to pevent malaia and

dengue.

!a" 'hy ae the values &eing displayed &y ;ohan?s teache(

!&" 'hy does a soap &u&&le show &eautiful colous(

Ans.

!a"Appeciation of natue and motivation.!&"Qight waves eCected fom the uppe and lowe sufaces of thin %lm

intefee. Since the condition of &ight and da, finges ae satis%ed at

diFeent positions of diFeent wavelengths so coloued finges ae

seen.

5. Livin o&seved that when a sheet of tanspaent plastic is placed &etween

two cossed polaiGes no light is tansmitted. 'hen the sheet is stetched in

one diection some light passes though the cossed pola ises. e wassupised to see that and out of shea enthusiasm he went to his physics

teache fo ,nowing the eason &ehind it. #he teache eplained him that the

stetched plastic sheet tuns into a =olaoid and allows faction of light pass

though it.

!a" 'hat ae the values &eing displayed &y Livin hee(


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!&" 'hen the plastic sheet is stetched in one diection some light passes

though the cossed polaiGes. 'hat is happening(

Ans.

!a"=owe of o&sevation and cuiosity!&"'hen the sheet is stetched the polyme molecules in it ma,e it

=olaoid with its own polaoid ais.


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An-er-

!i" 'o, function of a metal depends upon the amount of estaining

foces acting on the electons to &e e8ected. In diFeent metals the

amount of estaining foces on the electons to &e e8ected is

diFeent. ence. 'o, function fo diFeent metals is diFeent.!ii" U0 hc V0

!3.3)10-)*" !)10+" !1./1.310-1H" 10)710-Hm

!iii" 'hat we undestand fom this study is that su@cient

enegypotential!&asic ,nowledge and undestanding"is equied to

succeed and ecel in all ou endeavous.

/. KDnow you face &eauty though compleion meteN was one of the

stall on a science ehi&ition. A student inteested to ,now hishe face

&eauty was made to stand on a platfom and light fom a lamp wasmade to fall on hishe face. #he eading of compleion mete

indicated the face &eauty of the student which might &e vey fai fai

semifai semida, and da,etc.;ead the a&ove passage and answe the following questionsJ!i" 'hat is the &asic concept used in the wo,ing of compleion

mete(!ii" ow is the face &eauty ecoded &y face compleion mete(!iii" 'hat &asic values do you lean fom the a&ove study(

An-er-

!i" =hotoelectic eFect!ii" #he eading of compleion mete depends on the cuent geneated

fom the light eCected fom the face. 4aie the colou moe is the

light eCected and vice vesa.!iii" It is undestood that faie the s,in &ette the appeaance. #his is

only physical oute pesonality. #he inne &eauty is valued &y the

vitue heshe possesses which gives a &ette pesonality to a

peson. So moe the inne light &ette the adiation.

). Accoding to =lan,?s quantum theoy of light evey souce of adiation

emits photons !i.e. pac,ets of enegy" which tavels in all diections

with the same speed !i.e. speed of light". >ach photon is of enegy >

hW hcU whee h is =lanc,?s constant W is the fequency and U is the

wavelength of adiation emitted. #he photons emitted fom diFeent

souces of adiation ae diFeent.;ead the a&ove passage and answe the following questionsJ


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!i" Bn what factos does the num&e of photons emitted pe second

fom a souce of adiation depend(!ii" 'hy ae the high enegy photons not visi&le to eyes(!iii" 'hich &asic values do you lean fom this study(

An-er-

!i" #he num&e of photons emitted pe second fom a souce of

adiation depends on its tempeatue natue and aea of adiating

suface.!ii" #he etina of ou eye is sensitive to visi&le light whose fequency

ange is * 101*G. to + 101* G. igh enegy photons ae of

fequency much highe than + 101* G. #hey do not poduce any

sensation on ou etina. ence they cannot &e seen &y ou eyes.!iii" Qi,e photons the goodness of a peson would &e emitted &y

cultivating good qualities ethics and moals. So one should liveamidst good people and follow them.

*. Ms. :hivya lives alone with he gandpaents and when she goes to

school$ he gandpaents ae left alone at home. She was woied

a&out thei safety due to inceased &uglay cases in the city. Bne day

she was watching a pogamme on # in which they told a&out

&uglas? alam. #he vey net day she went to ma,et and got the

&ugla alam installed in he house.;ead the a&ove passage and answe the following questionsJ

!i" ow can a &ugla alam povide safety against &uglay(!ii" 'hat values ae ehi&ited &y Ms. :hivya(!iii" 'hat othe application one can %nd using the same pinciple(

An-er-

!i" ltaviolet light is continuously made to fall on a photocell installed

at the doowayswindows. 'hen a peson entes though the doo

o window he inteupts the &eam falling on the photocell. #his

a&upt change in photocuent stats the inging of an electic &ul&.!ii" 6eneal awaeness caing natue concen fo old people

esponsi&ility pesence of mind etc.!iii" #o poduce sound in movies #o count vehicles passing at a point

Automatic contol of steet light system Automatic opening of

dooswindows

5. ;adiation has dual natue i.e. it possesses the popeties of &oth wave

and paticle. #his pompted de-Eoglie to pedict dual natue of moving


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mateial paticles. #hus waves ae associated with moving mateial

paticles which ae called matte waves. #he wavelength of matte

waves is given &y U hmW whee m is the mass W is the speed of the

paticle and h is =lanc,?s constant.;ead the a&ove passage and answe the following questionsJ

!i" ow was the wave natue of electon esta&lished(!ii" 'hat ae the de-Eoglie wavelengths associated with a paticle !i" at

est !ii" moving with in%nite speed(!iii" 'hat ae the &asic values displayed &y this study(

An-er-

!i" :avission and 6ane o&seved diFaction pattens of slow moving

electons. As diFaction is essentially a wave phenomenon it was

concluded that wave must &e associated with moving electons.

!ii" At est W 0 U hmW hm0 X=aticle moving at infinite speed W XU hmW hm X 0!iii" Qi,e the wave natue of electons the almighty is also omnipotent

and it depends on how we ealiGe im

3. itesh has a camea %lled with photoelectic cell fo automatic

ad8ustment so that he can clic, pictues of gils without &eing noticed

&y them o othes. #hough photogaphy is a nice ho&&y he cannot

indulge in such unlawful act.'hat do you thin, a&out this and how do you eact(

An-er

#his act amounts to misuse of camea and intefeing into othes?

pivacy which is not pemitted &y law. #his would lead to con%scation

of camea and legal action against him which would &e detimental to

his caee pogess. I will advise him of the consequences and pevent

him into such an act.

7. Qittle Simi used to see white light adiating fom mecuy lampinstalled in he steet. Initially it was so soothing that she ,ept on

loo,ing at it fo hous. Afte some time he eyes wee paining has&ecome ed and constantly wateing.

'hat happened to he eyes( 'hy is itiitating(

An-er


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6lae of poweful lights due to adiation eFect aFect the eyes and

so one should not see it fo so long. She should ta,e est and splash

plain wate on he eyes to get id of iitation.

+. Sona,shi wo,s in a diagnostic la& on an -ay machine. 'hile teating

patients she used to neglect safety measues thin,ing that thee aeno ill-eFects of -ays. Su&sequently she suFeed fom po&lems li,e

chaed s,in &ad eye sight etc.'hat do you thin, is the po&lem and what she should have done while

opeating this machine(

An-er

-ays have high penetating powe and so should not &e eposed to

the path of -;ays. 'hile attending to patients &eing -ayed she

should have used gloves and mas,s fo potection.

ATOMS AND NUCLEI

1.'hile studying the natue of nuclea foces inod found that the

oveall attaction &etween nucleus was a&out 100 times geate than

epulsion &etween two potons situated at a distance of a&out 1 fm !10-15".

e was amaGed &y this fact.

!a"'hat values ae possessed &y vinod(

!&"alculate the epulsive foce &etween two potons ,ept 1 fm awayinside a nucleus. 'hy does such &ig foce &ecome ineFective to pull

apat the nucleus(

A


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&y it. 'heeas Anand was against ;am?s views. e mentioned that geat

scientists including ou fome =esident :. A&dul,alam and ou

6ovenment had ta,en evey cae to povide safety measues with the

&est and latest technology.

)$ 'hat do you thin, of the new Dunagulam powe plant P a &oon o asin(

/$ :e%ne nuclea %ssion .c$ 'hat is the ole of contol ods in nuclea eacto(

!ANSa" &oon P powe plant would eadicate powe shotage and

the #amilnadu govt. can also sell ecess powe to othe states$ &" R

c" P ;efe ;# #et Eoo,"). A8ay of class II had a passion to &ecome an Astonaut. e always

spo,e a&out the astonauts and thei life in the space with othes. e

was encouaged &y his teaches paents and his fiends. e completed

II with meit and &ecame a scientist in IS;B. e got an oppotunity towo, in


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Q>: IS #> E>S# souce fo the a&ove said easons. #hey collected

the infomation fom vaious souces and su&mitted the po8ec

a&out its wo,ing advantages and its applications &y pesenting with a good

wo,ing model a" Ey seeing these two students what ,ind of qualities you

want adopt fom them. &" >plain Q>: with neat diagam and daw its sym&ol. !ANS

a" Initiative cuiosity punctuality o&edience R &" ;efe ;# tet &oo,"/. ;ahim a class I student of D visited his uncle and heas the &ugla

alam on opening the entance doo$ his aunt welcomes him. e goes

upstais and as,s his uncle who is a =hysics Qectue a&out the pinciple

wo,ing of a &ugla alam. e discusses this with his class mates and

decides to pesent a pogam on ]Eugla Alam? in the moning assem&ly.a" ow will you de%ne the inquisitiveness of ;ahim(&" State the laws of photoelectic emission!ANScuiosity to lean inteest in the su&8ect shaing ,nowledge$ &"

;efe ;# &oo,"). I went out fo shopping with my mothe$ duing puchase of vegeta&les I

noticed that the endo used a digital weighing machine. Bn

anothe shop I noticed the vendo was using an odinay weighing

machine. I emem&eed having studied a&out Qogic 6ates whee digital

codes ae used.a" 'hat do you mean &y Qogic 6ate( Mention the &asic univesal

gates.&" :aw sym&ols fo B; A


22/22

/. :eepa?s uncle wants to tal, to his son in SA. e does not have much

money to spend on telephone calls. e has a compute at his home. :eepa

told he uncle that he can tal, to his son with the help of compute and told

him a&out intenet. e uncle now tal,s to his son evey day. e than,ed

:eepa fo giving useful advice. O 'hat accoding to you ae the values

displayed &y :eepa. O ow does intenetwo,(

). Su8atha was watching he favoite # seial. Suddenly the pictue stated

sha,ing on # sceen. She as,ed he &othe to chec, the dish antenna. e

&othe found no po&lemin the antenna. Su8atha noticed the same po&lem

in # pictue again afte some time. At the same time she head the sound of

a low Cying atcaft passing ove thei house. She complained to he &othe

again. e eplained the cause of sha,ing pictue on # sceen when ai caft

passes ove head. i" 'hich values ae pomoted &y Su8atha?s &othe(

ii" 'hy was the pictue on the sceen sha,ing when the aicaft was passingove head(

*. Advancements in communication pinciples and technology has helped

man,ind to communicate almost instantly in any pat of the glo&e. #hese

advancements howeve have also shown advese eFects. Many school

authoities and paents ae not in favou of fee and unlimited access of

these electonic devices to students feaing advese eFects on thei

emotional and psychological health.

Answe the following questions elated to the infomation in the a&ovepassage.

i"

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XII Phy Value BasedQuestion 2014 - 15