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. Aquestions are compusory. 3. There is no o!erachoice. "owe!er, internachoice has been pro!ided in athe three questions of fi!e mar#s cate$ory. %ny one option in such question is to be attempted. &. Aquestions to section A and aquestions of section B are to be attempted separatey. 5. 'uestion numbers 1 to 3 i n section A are mar# questions. These are to be answered in one word or one sentence. (. 'uestion numbers & to ) ar e two mar#s questions, to be answered in about 30 words. ). 'uestion number * to 19 is three mar# questions, to be answered i n about 50 words. *. 'uestion number 20 to 2& are fi!e mar# questions, to be answered in about )0 words. 9. 'uestion numbers 25 to &2 in section B are mutipe choice questions based on practicas#is. +ach question is a one mar# question. ou are choosin$ 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/13] 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? Write the balanced chemical equation of the reaction. -ar#s/2#] Fresh milk has a pof !. ow do you think the pwill change as it turns into curd? "#plain -ar#s/2
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
$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?
+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.
$7
What are alloys? ow are they made? -ame the constituents and uses of brass0bronze and solder.
-ar#s/5
3]
What is a solenoid? raw the patterns of magnetic field lines of a solenoid throughwhich a steady current flows? What does the pattern of field lines inside thesolenoid indicate? Write a use of it.
Four students studied reactions of zinc and sodium 8arbonate with dilutehydrochloric acid and dilute sodium hydro#ide %olutions and presented their resultsas follows. >he C represents evolution of gas whereas represents absence ofany reaction0
)(* )B* )8* )*
-ar#s/1
A.
BB.
8.
.(
%]
When dilute 8l reacts with Dinc metal0 the gas liberated is?-ar#s/1
A.$#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:
&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
. ,arallel in circuit & and in series incircuit &&
3#]>he graph between current )&* and potential difference )/* in the e#perimentalverification of $hms Eaw drawn by four students. Which one is correct?
&n an e#periment on photosynthesis we cover a portion of leaf (0 of a de<starchedpotted plant with a red coloured strip0 a portion of another leaf B with black and aportion of leaf 8 with a green strip and then keep the plant in sunlight so thatphotosynthesis may place.
(fter four hours on performing starch test the result showed no starch formation inthe
-ar#s/1
A.8overed portion of leaf (
B.8overed portion of leaf B
.8overed portion of leaf 8
. 8overed portion of any of the above
Paper: Science X Summative Assessment Term I Sample Paper - 3
1. The question paper comprises of two sections, A and B you are to attempt both the sections.
2. A questions are compusory.
3. There is no o!era choice. "owe!er, interna choice has been pro!ided in a the three questions of fi!e mar#s cate$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%$3 solution becomes8olourless.
)blue* )colourless*
#]
>he p of milk decreases from ! as it turns into curd. >hat is curd is more acidic thanmilk.
generation is an effective method of the disposal of bio wastes like0 animal wastes andsewage.
1]
)i* &onic 8ompounds which are held together by strong ionic bonds so high amount ofenergy is required to break these bonds.
)ii*&onic compounds are very hard solids due to strong force of attraction betweenpositive and negative ions.
)iii*ydrogen gas is evolved when dilute hydrochloric acid is added to a reactive metal.
13]
)a* 8hemical reaction in which one reactant gets o#idized while the other get reduced isknown as a redo# reaction.
When +agnesium ribbon burns in air0 magnesium is o#idized and the white residueformed is of magnesium o#ide.
)b* 8hemical equations must always be balanced to follow the law of conservation ofmass0 according to which 2+ass can neither be created nor destroyed in a chemicalreaction.2
1!]
)i* >his is an e#ample of decomposition reaction and it is endothermic in nature.
)ii* >his is an e#ample of combination reaction and it is also a type of endothermicreaction.
)iii* >his is an e#ample of displacement reaction and it is e#othermic reaction.
1"]
)i* >he chemical name of ,laster of ,aris is 8alcium sulphate emi hydrate
)a* >wo important used of washing soda and baking soda are as follows: Washing soda:
)i* &t is used in glass0 soap0 and paper industries. )ii* &t is used to remove permanenthardness of water.
Baking soda:< )i* &t is used as baking powder. Baking powder is a mi#ture of baking sodaand a mild acid known as tartaric acid. When it is heated or mi#ed in water0 it releases8$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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