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8/11/2019 Sa i Class x Science 3
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Paper: Science X Summative Assessment Term I Sample Paper - 3
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]
Balance the chemical equation:-ar#s/1
]
What are the gustatory receptors?-ar#s/1
3]
What is solar panel?-ar#s/1
!]
What are the two vital functions of the human kidneys?-ar#s/2
"]
What happens when a strip of zinc is dipped into copper sulphate solution? Writethe balanced chemical equation of the reaction.
-ar#s/2
#]
Fresh milk has a p of !. ow do you think the p will change as it turns intocurd? "#plain
-ar#s/2
8/11/2019 Sa i Class x Science 3
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$]
$n what factors does the resistance and resistivity of a conductor depend? Write %&unit of resistance.
-ar#s/3
%]
Why do we use parallel circuit arrangement for domestic wiring? 'ive threereasons.
-ar#s/3
&]
( coil of insulated wire is connected to a galvanometer. What would be seen if abar magnet with its south pole is brought towards one Face of the coil is:
)a* +oved quickly towards it?
)b* +oved quickly away from it?
)c* ,laced near its one face?
)d* -ame the phenomena involved?
)e* -orth pole of bar magnet is brought towards the same face of the coil.
)f* -orth pole of bar magnet is kept stationary near the same face of the coil.
-ar#s/3
1']
What do the following transport:
)i* ylem
)ii* ,ulmonary artery
)i* pulmonary /ein
)ii* ,hloem
-ar#s/2
11]
What are the constituents of biogas? Write any two uses of this gas.-ar#s/3
1]
'ive reason:
)i* &onic compounds have high melting point
)ii* &onic compounds are hard crystalline solids.
)iii* Which gas is produced when dilute hydrochloric acid is added to a reactivemetal?
-ar#s/3
8/11/2019 Sa i Class x Science 3
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13]
)a* What is redo# reaction? When magnesium ribbon burns in the air and forms awhite residue0 is magnesium o#idized or reduced?
)b* Why should chemical equations be balanced?
-ar#s/3
1!]
-ame the type of chemical reaction represented by the following equation and alsomention the type endothermic1e#othermic:
-ar#s/3
1"]
)i*Write the chemical name and formula of 2,laster of ,aris2.
)ii* ow is it prepared?
)iii*Write chemical equations of the reaction.
-ar#s/3
1#]
)i* ( 344W refrigerator operates for 5! hrs1day0 calculate the cost to operate it for64 days at 7s 6.34 per kWh.
)ii* 8alculate the effective resistance between , and 9
-ar#s/3
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1$]
"#plain the digestion in stomach.-ar#s/3
1%]
+ention any three important functions of fore brain.-ar#s/3
1&]
raw a labeled diagram of a -euron. "#plain its Functions-ar#s/3
']
What is an endocrine gland? -ame any two endocrine glands present in a humanbody and write hormones secreted by them.
-ar#s/5
1]
)a* ;ou are provided with three test tubes (0 B0 8 which contain< distilled water0(cidic and basic solutions respectively. &f you are given blue litmus paper only0 howwill you identify the nature of the solutions in three test tubes.
)b* ,laster of ,aris should be stored in a moisture<proof container. "#plain why?
$7
)a* 'ive two important uses of washing soda and baking soda.
)b* Why do acids not show acidic behaviour in the absence of water?
-ar#s/5
]
( metal " is stored under kerosene. When a small piece of it is left open in the air0it catches fire. When the product formed is dissolved in water it turns red litmus toblue:
)i* -ame the metal ".
)ii* Write the chemical equation for the reaction when it is e#posed toair and when the product is dissolved in water.
)iii* "#plain the process by which the metal is obtained from its moltenchloride.
$7
What are alloys? ow are they made? -ame the constituents and uses of brass0bronze and solder.
-ar#s/5
3]
What is a solenoid? raw the patterns of magnetic field lines of a solenoid throughwhich a steady current flows? What does the pattern of field lines inside thesolenoid indicate? Write a use of it.
-ar#s/5
8/11/2019 Sa i Class x Science 3
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$7
)a* %tate the rule to determine the direction of a
)i* +agnetic field produced around a straight conductor carrying current
)ii* Force e#perienced by current = carrying straight conductor placed in amagnetic field which in perpendicular to it.
)iii* 8urrent induced in a coil due to its rotation in a magnetic field.
)b* What is the function of an earth wire? Why is it necessary to earth metallicappliances.
!]
raw a labeled diagram of uman eart. raw a table to show the functions ofany two chambers of uman eart.
$7
)a* raw a labeled diagram of %tomata.
Write two Functions of %tomata.
)b* What are the raw materials used during photosynthesis. Write chemicalequation for photosynthesis.
-ar#s/5
"]
>he p value of a solution is in the range of ! to . What is the colour developedwhen a student adds 6 drops of universal indicator in the solution
-ar#s/1
A.7ed
B.Blue
. $range
.'reen
#]
>he p values of distilled water0 fruit @uice and sodium bicarbonate were measuredusing p papers. What is the correct decreasing order of p values
-ar#s/1
A. Water A Fruit @uice A %odiumbicarbonate
B. Fruit @uice A Water A %odiumbicarbonate
. Water A %odium bicarbonate A Fruit
8/11/2019 Sa i Class x Science 3
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@uice
. %odium bicarbonate A Water A Fruit @uice
$]
Four students studied reactions of zinc and sodium 8arbonate with dilutehydrochloric acid and dilute sodium hydro#ide %olutions and presented their resultsas follows. >he C represents evolution of gas whereas represents absence ofany reaction0
)(* )B* )8* )*
-ar#s/1
A.
BB.
8.
.(
%]
When dilute 8l reacts with Dinc metal0 the gas liberated is?-ar#s/1
A.$#ygen
B.-itrogen
.8hlorine
. ydrogen
&]
&f &ron -ails are kept in 8u%$3 solution for two hours0 the colour of the solution willchange in to
-ar#s/1
A.,ink
B.Eight green
. ;ellow
. 7ed
3']
(n element reacts with o#ygen to give a compound with a high melting point. >hiscompound is also soluble in water. >he element is likely to be:
-ar#s/1
A.8arbon
B.%ilicon
8/11/2019 Sa i Class x Science 3
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. &ron
.8alcium
31]
&f four resistors each of 5 are connected in parallel. >he effective resistance will
be:
-ar#s/1
A.4.
B.3
. G
.4.G
3]
For the circuits shown in figures & and &&0 the ammeter readings would be
-ar#s/1
A.4( in 8ircuit & and 5( in 8ircuit &&
B.4( in both 8ircuits
. 5( in both 8ircuits
.5( in 8ircuit & and 4( in 8ircuit &&
33]
>hree resistors each having same resistance are connected in parallel. >heirequivalent resistance is 5 . &f they are connected in series0 their equivalentresistance will be:
-ar#s/1
A.6
B.5
.!
. H
3!]
"ach of the resistances in the above question will be :-ar#s/1
A.G
8/11/2019 Sa i Class x Science 3
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B.H
. 5
.6
3"]
>he resistors 75 and 7G are connected in
-ar#s/1
A.,arallel in both circuits
B.%eries in both circuits
.%eries in circuit & and in parallel incircuit &&
. ,arallel in circuit & and in series incircuit &&
3#]>he graph between current )&* and potential difference )/* in the e#perimentalverification of $hms Eaw drawn by four students. Which one is correct?
-ar#s/1
A.
B.
8/11/2019 Sa i Class x Science 3
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.
.
3$]
>emporary mount of a peel is made in:-ar#s/1
A.(lcohol
B.Water
. (cetone
.'lycerine
3%]
>o remove chlorophyll0 the leaf is boiled in to:-ar#s/1
A.Water
B.&odine solution
. -one of these
.(lcohol
3&]
&n the following sketch of the stomatal apparatus the parts &0 &&0 &&& and &/ werelabeled differently by four students.
-ar#s/1
8/11/2019 Sa i Class x Science 3
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>he correct labeling out of the following is:
A.
)&* 'uard cell
)&&* %toma
)&&&* %tarchgranule
)&/* nucleus
B.
)&* 8ytoplasm
)&&* 8hloroplast
)&&&* %toma
)&/* nucleus.
.
)&* 'uard cell
)&&* -ucleus
)&&&* %toma
)&/* 8hloroplast
!']
>o show that 8$G is released during respiration we take-ar#s/1
A.ry seeds
B.Boiled seeds
. Wet seeds
.'erminating seeds
!1]
>he function of I$ in the e#perimental set up to show that 8$G is released duringrespiration is:
-ar#s/1
8/11/2019 Sa i Class x Science 3
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A.>o enhance respiration
B.>o release o#ygen for respiration
. >o remove water vapour from theflask
.>o absorb 8$G released by
germinating seeds!]
&n an e#periment on photosynthesis we cover a portion of leaf (0 of a de<starchedpotted plant with a red coloured strip0 a portion of another leaf B with black and aportion of leaf 8 with a green strip and then keep the plant in sunlight so thatphotosynthesis may place.
(fter four hours on performing starch test the result showed no starch formation inthe
-ar#s/1
A.8overed portion of leaf (
B.8overed portion of leaf B
.8overed portion of leaf 8
. 8overed portion of any of the above
Paper: Science X Summative Assessment Term I Sample Paper - 3
Total marks of the paper: 90
Total time of the paper: 3.5 hrs
General Instructions:
8/11/2019 Sa i Class x Science 3
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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$ory. %ny one option insuch question is to be attempted.
&. A questions to section A and a questions of section B are to be attempted separatey.
5. 'uestion numbers 1 to 3 in section A are mar# questions. These are to be answered in one word or one sentence.
(. 'uestion numbers & to ) are two mar#s questions, to be answered in about 30 words.
). 'uestion number * to 19 is three mar# questions, to be answered in about 50 words.
*. 'uestion number 20 to 2& are fi!e mar# questions, to be answered in about )0 words.
9. 'uestion numbers 25 to &2 in section B are mutipe choice questions based on practica s#is. +ach question is a one mar# question. ouare choosin$ 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.
Solutions:
1]
]
>he receptors present in the specific regions of the tongue are called gustatoryreceptors.
3]
( large number solar cell combined in an arrangement.
!]
)i* uman kidney performs the e#cretion by cleaning the blood of metabolic wastes.
)ii* &t performs the function of osmoregulation by maintaining normal levels of water andmineral ions in the body fluids.
"]
Dn being more reactive displaces 8u from 8u%$3 solution 8u%$3 solution becomes8olourless.
)blue* )colourless*
#]
>he p of milk decreases from ! as it turns into curd. >hat is curd is more acidic thanmilk.
$]
7esistance depends upon:
)i* Eength of the conductor
8/11/2019 Sa i Class x Science 3
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)ii* (rea of cross section
)iii* +aterial of conductor
7esistivity depends on:
)i* +aterial
)ii* >emperature
%& Jnit of resistance is $hm or
%]
)i* "ach appliance have equal potential differenc
)ii* "ach appliance have a separate switch to on1off
)iii* "ach appliances can be operated on different current
&]
)a* +omentary deflection in the galvanometer to one side.
)b*+omentary deflection in the galvanometer now in opposite direction.
)c*-o deflection in the galvanometer.
)d*,henomenon involved is electromagnetic induction.
)e* +omentary deflection in the galvanometer now in opposite to the direction of thefirst case.
)f* -o deflection in the galvanometer.
1']
)i* ylem = water and minerals in plants
)ii* ,ulmonary (rtery = eo#ygenated blood from heart to lungs.
)iii* ,ulmonary /ein = $#ygenated blood from lungs to heart.
,hloem = %ynthesised food in plants
11]
5*+ethane or 83
G* ydrogen
6* ydrogen sulphide
3* 8$G
Jses (ny two:
. For the production of electricity ii. (s a fuel to produce heat and light. iii. Biogas
8/11/2019 Sa i Class x Science 3
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generation is an effective method of the disposal of bio wastes like0 animal wastes andsewage.
1]
)i* &onic 8ompounds which are held together by strong ionic bonds so high amount ofenergy is required to break these bonds.
)ii*&onic compounds are very hard solids due to strong force of attraction betweenpositive and negative ions.
)iii*ydrogen gas is evolved when dilute hydrochloric acid is added to a reactive metal.
13]
)a* 8hemical reaction in which one reactant gets o#idized while the other get reduced isknown as a redo# reaction.
When +agnesium ribbon burns in air0 magnesium is o#idized and the white residueformed is of magnesium o#ide.
)b* 8hemical equations must always be balanced to follow the law of conservation ofmass0 according to which 2+ass can neither be created nor destroyed in a chemicalreaction.2
1!]
)i* >his is an e#ample of decomposition reaction and it is endothermic in nature.
)ii* >his is an e#ample of combination reaction and it is also a type of endothermicreaction.
)iii* >his is an e#ample of displacement reaction and it is e#othermic reaction.
1"]
)i* >he chemical name of ,laster of ,aris is 8alcium sulphate emi hydrate
)ii* &t is prepared on heating gypsum at 6K6 I
)iii*
1#]
)i*
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)ii* &n series 7G LK M 6 L54
76 L! M 3 L 54
&n ,arallal
$7
1$]
>he gastric glands in the stomach secrete:
)i* 8l = &t kills the bacteria ingested with food and makes the medium of food acidic soas to facilitate the action of the enzyme pepsin.
)ii* ,epsin = &t helps to digest proteins.
)iii* +ucus = &t protects the inner lining of the stomach from the action of 8l
1%]
>he functions of fore brain are:
)i* &t has sensory area where information is received from sense organs.
)ii* &t has motor area where impulses are sent to muscles or effector organs.
8/11/2019 Sa i Class x Science 3
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)iii* &t has centres for visual reception0 touch0 smell0 temperature and muscular activities.
1&]
)a* iagram of -euron:
Functions:
)i* >o carry information from receptors to brain and spinal cord.
)ii* >o transfer respose from brain and spinal cord to effectors.
']
)a* >he glands which does not have duct and secretes its product directly into bloodstream is called an endocrine gland.
>wo glands are: >hyroid and pancreas.
>hyroid secretes thyro#in and pancreas secretes insulin.
1]
)a*
)i* >est the three solutions with blue litmus paper0 the solution that changes l bluelitmus into red is (cidic solution.
)ii* >est the remaining two solution with the red litmus one solution will change itagain to blue =then that solution is basic solution.
)iii* 7emaining third solutions is distilled water which being neutral does not cause anycolour change of either the blue or red litmus paper.
)b* ,laster of ,aris should be stored in a moisture<proof container because ,laster
of ,aris0 a powdery mass absorbs water )moisture* to form a hard solid known asgypsum.
8/11/2019 Sa i Class x Science 3
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$7
)a* >wo important used of washing soda and baking soda are as follows: Washing soda:
)i* &t is used in glass0 soap0 and paper industries. )ii* &t is used to remove permanenthardness of water.
Baking soda:< )i* &t is used as baking powder. Baking powder is a mi#ture of baking sodaand a mild acid known as tartaric acid. When it is heated or mi#ed in water0 it releases8$G gas that makes bread or cake fluffy. )ii* &t is used in soda<acid fire e#tinguishers.
)b* (cids dissociate in the presence of water to give free hydrogen ions. &t is thehydrogen ions that are responsible for the acidic behaviour.
]
)i* +etal = sodium
)ii*
)ii* "lectrolysis of molten chloride )-a8l*
$7
efinition: omogeneous mi#ture of two or more metals or a metal and a non metal
,repared:
)i* +elting the primary metal.
)ii* issolving the other elements in a definite proportion and then cooling them toroom temperature .
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3]
( coil of many circular turns of insulated copper wire wrapped closely in the shape of acylinder.
>he magnetic field is uniform inside the solenoid
Jsed to magnetise a piece of magnetic material.
$7
)a* )i* 7ight hand >humb rule
)ii* Flemings Eeft hand rule
)iii* Flemings 7ight hand rule
)b* )a* >o avoid the risk of electric shocks )b* >o save the electricalappliances from damage.
!]
)a*
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)b* Functions of chambers of human heart:
Eeft (trium = 7eceive o#ygenated blood from pulmonary vein
7ight (trium = 7eceive deo#ygenated blood from vena cava
Eeft /entricle = ,umps o#ygenated blood to all parts of body
7ight /entricle = ,umps deo#ygenated blood to lungs. )(ny two*
$7
)a* iagram of %tomata:
Functions
)a* "#change of gases
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)b* >ranspiration
7aw materials for photosynthesis are 8$G0 G$
"]
'reen
#]
%odium bicarbonate A Water A Fruit @uice
$]
(
%]
ydrogen
&]
7ed
3']
8alcium
31]
4.G
3]
4( in 8ircuit & and 5( in 8ircuit &&
33]
H
3!]
6
3"]
,arallel in circuit & and in series in circuit &&
3#]
3$]
'lycerine