Sa i Class x Science 4

8/11/2019 Sa i Class x Science 4

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Paper: Science X Summative Assessment Term I Sample Paper - 4

Total marks of the paper: 90

Total time of the paper: 3.5 hrs

General Instructions:

1. The question paper comprises of two sections, A and B you are to attempt both the sections.

2. A questions are compusory.

3. There is no o!era choice. "owe!er, interna choice has been pro!ided in a the three questions of fi!e mar#s cate$ory. %ny one option insuch question is to be attempted.

&. A questions to section A and a questions of section B are to be attempted separatey.

5. 'uestion numbers 1 to 3 in section A are mar# questions. These are to be answered in one word or one sentence.

(. 'uestion numbers & to ) are two mar#s questions, to be answered in about 30 words.

). 'uestion number * to 19 is three mar# questions, to be answered in about 50 words.

*. 'uestion number 20 to 2& are fi!e mar# questions, to be answered in about )0 words.

9. 'uestion numbers 25 to &2 in section B are mutipe choice questions based on practica s#is. +ach question is a one mar# question. ou

are choosin$ one most appropriate response out of the four pro!ided to you.

10. An addition 15 minutes time has been aotted to read this question paper ony.

Questions:

1]

Name one Metal and one Non-Metal which exists in liquid state at roomtemperature?

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]

How is brain protected from shocks and injuries?

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!]

Name the instrument used for measuring:

(i !otential difference (ii "urrent

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4]

#efine double displacement reaction with the help of an example$-ar#s/2

"]

H"l and HN%&show acidic characters in aqueous solution while alcohol and glucosesolutions do not$ 'ie reasons$

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#]

)hat happens to glucose that enters the nephron along with the filtrate?-ar#s/2


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$]

How man* electrons will flow through a wire when the charge of +" flows for ,sec? lso find the current$

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%]

wire is cut into three equal parts and then connected in parallel with the samesource$ How will its: (a .esistance (b resistiit* gets affected?

(c How would the total current and the current through the parts change?

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&]

How does the strength of the Magnetic field at the centre of a circular coil of a wiredepend on

(a .adius of the coil (b number of turns of wire in the coil?

(c #raw the magnetic lines of force in case of a circular coil of a wire$

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1']

How are water and minerals absorbed b* the plant?-ar#s/3

11]

)hat are the disadantages of using fossil fuels? 'ie two instances where solarcells are exclusiel* used as source of energ*$

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1]

(a )ith the help of a suitable example/ explain %xidation and .eduction in termsof gain or loss of ox*gen$

(b 0dentif* the substances that are oxidised and the substances that are reducedin the following reaction:

+Na(s 1 %,(g ,Na,%(s

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1!]

(a )hat are ionic compounds? 0onic compounds conduct electricit* onl* in molten

state not in solid state$ )h*?

(b$ )h* do ionic compounds hae high melting points?

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14]

)hat are exothermic and endothermic reaction$ 2xplain with the help of oneexample each$

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1"]

3he pH of the mouth of a person is lower than 4$4$ )hat changes will occur in hismouth? How these changes can be controlled? )rite an* two measures$

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1#]

Mention an* three important functions of fore brain$-ar#s/3

1$]

'ie the eents that occur during photos*nthesis$-ar#s/3

1%]

Name the hormones secreted b* 3h*roid/ !ancreas and drenal glands$ )rite afunction of each hormone

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1&]

3endril encircles or coils around the object in contact with it$ 2laborate$-ar#s/3

']

sanitar* worker uses a white chemical haing strong smell of chlorine gas todisinfect the water tank$

(a 0dentif* the chemical compound$

(b )rite the chemical formula$

(c )rite chemical equation for preparing it$

(d )rite its an* two uses$

%.

(a )rite an equation to show the reaction between !laster of !aris and water$

(b Name the substance which on treatment with chlorine *ields bleaching powder$

(c Name the sodium compound which is used for softening hard water$

(d )hat will happen if a solution of sodium h*drocarbonate is heated? 'ie the

equation of the reaction inoled$

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1]

#efine corrosion$ Name a metal which corrodes and one metal which does not$

)rite an* three methods of preention of corrosion$

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%.

)rite balanced chemical equation for the reactions taking place when

(i5inc carbonate is calcinated$

(ii5inc sulphide is roasted$

(iii5inc oxide is reduced to 5inc$

(i"innabar is heated in the air$

(Magnese dioxide is heated with luminium !owder$

]

#raw a neat diagram of .espirator* 6*stem in Humans and label the following:

(i 3rachea (ii 7ronchi (iii 8ungs (i 8ar*nx

)here does exchange of gases take place?

%.

#raw neat diagram of digestie s*stem$ 8abel its all parts$ How the maincomponents of the food digested in the small intestine? 2xplain$

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!]

(a #raw a schematic diagram of the common domestic circuit$

(b )rite difference between oerloading and short circuiting$

%.

nswer the following questions:

(i)hat is the direction of magnetic field lines outside a bar-magnet?

(ii)hat is 60 unit of magnetic field?

(iii)hat does crowding of magnetic field lines indicate?

(i)hat is the frequenc* of $"$ in 0ndia?

(Name two organs in human bod* where magnetic field is quite significant$

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4]

(in electric heater connected to a ,,9 lines has two resistance coil of ,, %hmseach$ "alculate the current if these coils are used

(a 6eparatel* (b 0n series (c 0n !arallel

(ii )rite two adantages and two limitations of using 6olar "ooker$

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%.

)hat happens to the deflection of the compass needle at a point near currentcarr*ing straight conductor

(a 0f the current is increased$

(b 0f the direction of current in the conductor is changed$

(c 0f compass is moed awa* from the conductor$

(d #raw the diagram showing the magnetic field lines around the straight currentcarr*ing wire$

"]

;our students (a/ (b/ (c and (d measured the pH alues of water/ lemon juiceand sodium bicarbonate solution$ )hat is the correct decreasing order of pHalues?

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A.water < lemon juice < sodium bicarbonate

B.lemon juice < water < sodium bicarbonate

. water < sodium bicarbonate < lemon juice

.sodium bicarbonate < water < lemon juice

#]

drop of solution =>= is placed on a strip of pH paper$ deep red colour inproduced$ 3he solution =>= is:

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A.

Na%HB.

)ater. Na,"%&

.H"l

$]

5inc granules were added to inc sulphate/ copper sulphate/ aluminium sulphateand iron sulphate solutions as shown below$ @ou would obsere the deposition ofmetal on inc in beakers:

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A.0 and 000

B.0 and 00


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. 00 and 0

.00 and 0

%]

;our students performed the reactions of a dil H*drochloric acid and a solution of

sodium h*droxide with inc metal and solid sodium carbonate separatel*$ 3he*reported the possible reaction b* (A and no reaction b* (>$ 0n which of thefollowing sets all obserations are correct?

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A.6et H"l15n H"l1Na,"%& Na%H15n Na%H1Na,"%&

(a A A A A

B.6et H"l15n H"l1Na,"%& Na%H15n Na%H1Na,"%&

(b x x A A

.6et H"l15n H"l1Na,"%& Na%H15n Na%H1Na,"%&

(c A A > x

.6et H"l15n H"l1Na,"%& Na%H15n Na%H1Na,"%&

(d A A A >

&]

%n adding a few drops of uniersal indicator to three colourless solutions takenseparatel* in three test tubes labeled !/ B/ . respectiel* the colours deeloped inthe solutions are marked in the following figures:

)hat is the correct decreasing order of pH$ alues of the solutions$

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A.

! < B < .B.

B < ! < .

.. < B < !

. . < ! < B

!']

;e,%&1 ,l l,%&1 ,;e-ar#s/1


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3he aboe reaction is an example of a

A."ombination reaction

B.#ouble displacement

. #ecomposition reaction. #isplacement reaction

!1]

3o determine the equialent resistance of three resistors/ when connected in aparallel arrangement/ ;our students connected the resistors as follows$

3he correct set up is that of student$

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A.

B."

. #

.7

!]

student has to connect + cells of C$4 each/ to form a batter* of oltage D

3he correct wa* of connecting these cells is shown in figure$

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A.7

B."


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. #

.

!!]

3he correct set up for stud*ing the dependence of the current on the potential

difference across a resistor is:

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A.

B.7

. #

."

!4]

;our resistors are connected in !arallel$ 2ach has a resistance , $ 3he effectieresistance is:

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A.E


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B.+

. 9$,4

.9$4

!"]

3he following circuit diagram shows the experimental set up for the stud* ofdependence of current on potential difference$ )hich two circuit components areconnected in series$

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A.7atter* and oltmeter

B.mmeter and oltmeter

. .esistor and oltmeter

.mmeter and rheostat

!#]

"alculate the 2quialent .esistance from the following combination of resistors$

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A.,

B.&

. C$4

.C

!$]

0n an experiment on photos*nthesis we coer a portion of leaf ==/ of a de-starchedpotted plant with a red coloured strip/ a portion of another leaf 7 with black and aportion of leaf " with a green strip and then keep the plant in sunlight so that

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photos*nthesis ma* place$

fter four hours on performing starch test the result showed no starch formation inthe

A."oered portion of leaf

B."oered portion of leaf 7

."oered portion of leaf "

. "oered portion of an* of the aboe

!%]

"oerslip is put on the slide er* gentl* to aoid:-ar#s/1

A."rushing of the material

B.%oing of gl*cerine

. None of these

.2ntr* of air bubbles

!&]

3he figure that correctl* depicts the remoal of chloroph*ll is:

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A.0

B.00

.000

. 0

4']

8eaes are destarched b* keeping the plant in:-ar#s/1

A.#ark room for & hours

B.8ight for 9& hours

. 8ight for 9& da*s


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.#ark room for 9& da*s

41]

0n the following sketch of the stomatal apparatus/ the parts 0/ 00/ 000 and 0 werelabeled differentl* b* four students$

3he correct labeling out of the following is:

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A. 0 guard cell 00 stoma 000 starch

granule 0 nucleus

B. 0 guard cell 00 starch 000 nucleus 0stoma

.0 c*toplasm 00 chloroplast 000 stoma0 nucleus

. 0 c*toplasm 00 nucleus 000 stoma 0chloroplast

4]

fter performing the experiment to show that germinating seeds gie out carbondioxide during respiration/ students drew the following diagrams

3he correct labeled diagram is

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A.

B.

7

."

. #


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$]

%]

(a

8et .esistance of a wire F .

)hen cut into & equal parts

.esistance of each part F

)hen connected in !arallel/ net resistance .p:

(b .esistiit* will remain same$(c "urrent through each part will be triple thepreious and total current in the circuit will be G times$

&]

(a 6trength of magnetic field (7 is inersel* proportional to radius of the coil (r

(b #irectl* proportional to the Number of turns in the coil (N

( c 3he magnetic field lines will be like:


14/22

1']

t the roots/ cells in contact with the soil actiel* take up ions$ 0t creates a difference inthe concentration of these ions between roots of soil$ 3o eliminate this difference/ watermoes in to the roots from the soil$ 3hus water of minerals are absorbed b* the plants$

11]

(i 7uring of coal or !etroleum !roducts lead to air pollution

(ii 3he oxides of "/ N and 6 are released on buring fossil fuels as acidic oxides itleads to acidic rain and affect water soil$

(iii "%,/ a green house gas causes global warming (or an* other releant point

i$ 6ource of electricit* in artificial satellites ii$ sed as source of electricit* in radio andwireless transmissions/ at 3 rela* stations/ traffic lights and research centers$

1]

(a %xidation: gain of ox*gen b* a substance

or an* other example

.eduction: loss ox*gen b* a substance or an*example

(b 6odium (Na is oxidised to sodium oxide as it gains ox*gen and ox*gen gets reduced$

1!]

(a 3he compounds formed b* transfer of electrons from metal to non metal are calledionic compounds

0n ionic compounds/ there are strong electrostatic forces of attraction between theoppositel* charged ions$ #ue to this/ moement of ions is not possible due to their rigidstructure$

0n molten state/ the electrostatic forces of attraction between the oppositiel* chargedions are oercome due to heat$


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(b 0onic compounds hae strong electrostatic forces of attraction between the ions$3herefore/ it requires a lot of energ* to oercome these forces$ 3hat is wh* ioniccompounds hae high melting points$

14]

2xothermic: .eactions in which heat is released$

2ndothermic: .eactions in which heat is absorbed$

or an* other

1"]

)hen the pH of mouth of a person is lower than 4$4 tooth deca* starts

3ooth enamel made up of calcium phosphate is corroded$

Measures:

(i "lean the mouth after eating food

(ii se of toothpaste (generall* basic in nature

1#]

3he functions of fore brain are:

(i 0t has sensor* area where information is receied from sense organs$

(ii 0t has motor area where impulses are sent to muscles or effector organs$

(iii 0t has centres for isual reception/ touch/ smell/ temperature and muscular actiities$

1$]

3he following eents occur during photos*nthesis:

(i bsorption of light energ* b* chloroph*ll$

(ii "onersion of light energ* to chemical energ* and splitting of water molecules intoh*drogen and ox*gen$

(iii .eduction of carbon dioxide to carboh*drates$

1%]

'land Harmone ;unction

3h*roid 3h*roxin .egulates fat protein and carboh*dratemetabolisms

!ancrease 0nsulin .egular blood sugar leel


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drenal gland drenaline !repage the bod* to face the emergenc*situation and blood pressure

1&]

uxin diffuses to the other part which is awa* from the support$!art of the tendril in

contact from the support does not grow rapidl*!art of the tendril awa* from the support grow rapidl* and cause the tendril to growaround a support$

']

(a 7leaching !owder

(b "a%"l,

(c

(d 7leaching powder is used:

(i as an oxidising agent in man* chemical industriesI and

(ii for disinfecting drinking water to make it free of germs$

%.

(a 3he chemical equation for the reaction of !laster of !aris and water can be

represented as:

(b "alcium h*droxide J"a(%H,K/ on treatment with chlorine/ *ields bleaching

powder$

(c )ashing soda (Na,"%&$C9 H,% is used for softening hard water$

(d )hen a solution of sodium h*drogencarbonate is heated/ sodium carbonate and waterare formed with the eolution of carbon dioxide gas$

1]

"orrosion: !rocess of slowl* eating up of metals due to action of atmospheric gases

Metal does not corrode ?'old

)hich corrode ?0ron or an* other


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!reention:

(i7* painting

(ii7* greasing or oiling

(iii'aliniation

(i3in platingL "hromium plating etc$ (an* three

%.

(i

(ii JCK

(iii

(i

(

]

(b 2xchange of gases take place in the aleoli

%.

(a


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0t receie secretion from lier and pancreas in the form of juice and tr*psin

3r*sin digest proteins$

8ipase digest fats

7ile juice makes basic medium and emulsifies fats

0ntestinal uice conerts proteins to amino acids "arboh*drates to glucose and fats tofatt* acids and gl*cerol$

!]


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(b

(i %er loading is caused when too man* short circuit appliances are connected to asingl socket

(ii )hen lie wire and neutral wire come into direct contact

%.

(i North !ole to 6outh !ole

(ii 3esla

(iii 6trong magnetic field

(i 49 H

( Heart and brain

4]

(i 6eparatel*: "urrent

(ii 6eries .F.C1.,F++

(iii 0n !arallel

dantages of solar cooker:(an* two JCL,x+F,K

(C ;ree of cost

(, #oes not cause an* pollution

(& Nutritie alue of food is retained

#isadantages:

(i"an not used in night

(ii"an not be used in cloud* da*

(iii#irection of sunlight is need and to be adjusted frequentl* or an* other


20/22

%.

(a #eflection increases

(b #irection of deflection changes

(c #eflection decreases$ JCK

(d

8ooking at a crossection l*ing in the plane of the paper$

t a distance d from the wire/ the magnetic field direction is asshown and the magnitude is constant for all points shown$

"]

sodium bicarbonate < water < lemon juice#]

H"l

$]

00 and 0

%]

6et H"l15n H"l1Na,"%& Na%H15n Na%H1Na,"%&

(d ? ? ? >

&]

. < ! < B

!']

#isplacement reaction

!1]

7


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!]

!!]

!4]

9$4

!"]

mmeter and rheostat

!#]

C

!$]

"oered portion of an* of the aboe

!%]

2ntr* of air bubbles

!&]

4']

#ark room for 9& da*s

41]

0 c*toplasm 00 nucleus 000 stoma 0 chloroplast

4]


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Documents

Sa i Class x Science 4