Sa i Class x Science 2

8/11/2019 Sa i Class x Science 2

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Paper: Science X Summative Assessment Term I Sample Paper - 2

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 which has low melting point:-ar#s/1

2]

Which part of brain is responsible for precision of voluntary actions?-ar#s/1

]

Why ventricles have thicker walls than auricles?-ar#s/1

!]

What is commercial unit of energy?-ar#s/2

"]

What is redox reaction? When magnesium ribbon burns in the air and forms awhite ash, is magnesium oxidized or reduced?

-ar#s/2

#]

A milkman added a small amount of baking soda to fresh milk

!a" Why does he shift the p# of fresh milk to slightly alkaline?

!b" Why does this milk take a longer time to set as a curd?

-ar#s/2


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$]

Name the two glands associated with the digestive system in humans Name theirsecretion also

-ar#s/2

%]

!a" What happens when $ron nails are kept into a %opper sulphate solution? Writethe balanced chemical e&uation for the reaction

!b" 'ive one example of precipitation reaction

-ar#s/3

&]

!a" What are ionic compounds?

!b" 'ive the formation of (g%l)from (g and %l)

-ar#s/3

1']

*xplain why:

!a" +espiration is an exothermic reaction?

!b" All decomposition reactions are endothermic reaction?

!c" When blue salt of copper sulphate is heated, it becomes colourless?

-ar#s/3

11]

ou are provided with three test tubes A, -, % which contain distilled water, Acidic

and basic solutions $f you are given blue litmus paper only, how will you identifythe nature of the solutions in three test tubes

-ar#s/3

12]

A .//W electric iron used in a house for ) hours per day %alculate the cost to useit for 0/ days at +s 1)/ per kWh

-ar#s/3

1]

%alculate the effective resistance between 2 and 3

-ar#s/3

1!]

'ive reasons for the following:-ar#s/3


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!i" 4he glottis is guarded by epiglottis

!ii" 4he lungs alveoli are covered with blood capillaries

!iii" 4he wall of the trachea is supported by cartilage rings

1"]

Write the functions of parts of hind brain-ar#s/3

1#]

5raw a labeled diagram of a Neuron *xplain its 6unctions-ar#s/3

1$]

Name the hormone synthesized at the shoot tips #ow does it help the plant toresponse to light?

-ar#s/3

1%]

#ow will the magnetic field 2roduced in a current carrying a circular coil change ifwe

!i" $ncrease the value of current

!ii" $ncrease the distance from the coil

!iii" $ncrease the no turns of the coil

-ar#s/3

1&]

Write three limitations of harnessing three types of energy from 7ceans-ar#s/3

2']

5raw a labelled diagram of #uman #eart 5raw a table to show the functions ofany two chambers of #uman #eart

7+

!a" 5raw a labelled diagram of 8tomata

Write two 6unctions of 8tomata

!b" What are the raw materials used during photosynthesis Write chemicale&uation for photosynthesis

-ar#s/5

21]

!a" Write the chemical name and formula of washing soda #ow is it prepared?Write the chemical e&uation of the reaction

-ar#s/5


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!b" Why does distilled water not conduct electricity, whereas rain water does?

7+

!a" 6ive solutions A, -, %, 5 and * when tested with universal indicator showed p#as

9, ,,; and


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!ii" 6orce experienced by current > carrying straight conductor placed in amagnetic field which in perpendicular to it

!iii" %urrent 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?

2!]

!a"A coil of insulated wire is connected to a galvanometer What would be seen if abar magnet with its south pole towards one 6ace of the coil is:

!a" (oved &uickly towards it?

!b" (oved &uickly away from it?

!c" 2laced near its one face?

!d" Name the phenomena involved?

!b" What are renewable sources of energy? 'ive two examples and one use ofeach

7+

!a"Which gas is filled in the electric bulb and why?

!b"7n what factors do the resistance of a conductor depend and how? Write 8$ unitof resistance

-ar#s/5

2"]

4he graph between current !$" and potential difference !" in the experimentalverification of 7hm@s aw drawn by four students Which one is correct?

-ar#s/1

A.

B.


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.

.

2#]

While performing the experiment on studying the dependence of current !$" on the

potential difference !v" across a resistor four students $, $$, $$$, and $ set up thecircuit as shown:

4he correct result will be obtained by the student:

-ar#s/1

A.$

B.$$$

. $

.

$$

2$]

6or the circuits shown in figures $ and $$, the ammeter readings would be-ar#s/1


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A./A in %ircuit $ and A in %ircuit $$

B./A in both %ircuits

. A in both %ircuits

.A in %ircuit $ and /A in %ircuit $$

2%]

4hree resistors each having same resistance are connected in parallel 4heire&uivalent resistance is $f they are connected in series, their e&uivalentresistance will be:

-ar#s/1

A.1

B.

.0

. +eceive oxygenated blood from pulmonary vein

+ight Atrium > +eceive deoxygenated blood from vena cava

eft entricle > 2umps oxygenated blood to all parts of body

+ight entricle > 2umps deoxygenated blood to lungs !Any two"

7+

!a"5iagram of stomata:


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!b" 6unctions of stomata:

!a"*xchange of gases

!b"4ranspiration

+aw materials for photosynthesis %7), #)7

21]

!a" 4he chemical name of washing soda is 8odium carbonate 5ecahydrate

4he formula is Na)%71/#)7

$t is obtained by heating baking 8oda and then recrystallization

!b" 5istilled water is a pure form of water and is devoid of any ionic species 4herefore, itdoes not conduct electricity +ain water, being an impure form of water, contains manyionic species such as acids and therefore it conducts electricity

7+

!a"

!i" Neutral= 8olution 5 with p# ; !ii" 8trongly alkaline= 8olution % with p# !iii"8trongly acidic= 8olution - with p# !iv" Weakly acidic= 8olution A with p# 9 !v" Weaklyalkaline= 8olution * with p#

Sa i Class x Science 2

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