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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?
-ar#s/1
]
How is brain protected from shocks and injuries?
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!]
Name the instrument used for measuring:
(i !otential difference (ii "urrent
-ar#s/1
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$
-ar#s/2
#]
)hat happens to glucose that enters the nephron along with the filtrate?-ar#s/2
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$]
How man* electrons will flow through a wire when the charge of +" flows for ,sec? lso find the current$
-ar#s/2
%]
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?
-ar#s/3
&]
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$
-ar#s/3
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*$
-ar#s/3
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
-ar#s/3
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?
-ar#s/3
14]
)hat are exothermic and endothermic reaction$ 2xplain with the help of oneexample each$
-ar#s/3
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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$
-ar#s/3
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
-ar#s/3
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$
-ar#s/5
1]
#efine corrosion$ Name a metal which corrodes and one metal which does not$
)rite an* three methods of preention of corrosion$
-ar#s/5
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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$
-ar#s/5
!]
(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$
-ar#s/5
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$
-ar#s/5
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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?
-ar#s/1
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:
-ar#s/1
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:
-ar#s/1
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?
-ar#s/1
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$
-ar#s/1
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$
-ar#s/1
A.
B."
. #
.7
!]
student has to connect + cells of C$4 each/ to form a batter* of oltage D
3he correct wa* of connecting these cells is shown in figure$
-ar#s/1
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:
-ar#s/1
A.
B.7
. #
."
!4]
;our resistors are connected in !arallel$ 2ach has a resistance , $ 3he effectieresistance is:
-ar#s/1
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$
-ar#s/1
A.7atter* and oltmeter
B.mmeter and oltmeter
. .esistor and oltmeter
.mmeter and rheostat
!#]
"alculate the 2quialent .esistance from the following combination of resistors$
-ar#s/1
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
-ar#s/1
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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:
-ar#s/1
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:
-ar#s/1
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
-ar#s/1
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:
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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
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%.
(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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