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1st PUC MOCK PAPER – Jan
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Marks:

70

Duration:

3 hours

General Instructions:
(i) All parts A to D are compulsory
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(iii) Answers without relevant diagram/figure/circuit wherever necessary will not carry any marks
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I
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2
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4
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6
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8
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10
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PART – A
Pick the correct option among the four given options for ALL of the following questions:
15 x 1 = 15
The number of significant figures in 30600 is
A) 2
B) 3
C) 5
D) 4
An object moving along a straight line covers equal distances in equal intervals of time
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B) Newton’s second law
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2 kms1
B) 112 kms 1
C) 1
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2 ms 1
The maximum load a wire can withstand without breaking, when its length is reduced to half of its
original length, will
A) be doubled
B) be halved
C) be quadrupled
D) remain same
The resistance to the relative motion between layers of a liquid is called
A) friction
B) viscosity
C) surface tension
D) cohesion
Water has maximum density at
A) 00 C
B) 320 C
C) 40 C
D) 90 C
The internal energy of an ideal gas depends on
A) temperature
B) pressure
C) density
D) specific volume

1st PUC Physics Mock paper Jan
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Efficiency of Carnot engine is 100 % if (with standard symbols)
A) T2  273 K
B) T2  0 K
C) T1  273 K

D) T1  0 K

13
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The circular motion of a particle with a constant speed is
A) periodic and oscillatory
B) neither periodic nor oscillatory
C) periodic but not oscillatory
D) oscillatory but not periodic
15
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Fill in the blanks by choosing appropriate answer given in the brackets for ALL the following
questions:
5x1=5
(equal, energy, compressibility, unequal, 1metre, sublimation)
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17
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18
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19
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20
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PART – B
III
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Write any two limitations of dimensional analysis
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Explain triangle law of vector addition
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Two forces of 4N and 3N act at a point making an angle of 600 with one another
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24
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25
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26
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27
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28
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IV
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30
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32
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Mention any three methods of reducing friction
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v , where the symbols have their usual meanings
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What is

33
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35
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its angular acceleration, assuming the acceleration to be uniform?
Draw typical stress - strain graph
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Arrive at an expression for gauge pressure inside a static fluid
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State any three postulates of kinetic theory of ideal gases
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2025

PART – D
V
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What is velocity - time graph? Derive x  v0 t  at 2 using v - t graph
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Show that the total mechanical energy of a freely falling body under gravity is conserved
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a) What are the factors on which the moment of inertia of a body depends?
b) Prove that the torque τ  Iα , where the symbols have their usual meanings
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a) What is isothermal process?

2
3
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b) Derive an expression for work done by a gas in an isothermal process
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Show that the overtones in a closed pipe are odd harmonics of the fundamental
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Answer any TWO of the following questions:
2 x 5 = 10
1
42
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If the mass of the car with the driver is 1000 kg , calculate the force exerted
by the brakes on the car and the time taken to stop the car
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The size of a planet is same as that of the earth
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Find the potential
energy of a mass of 2 kg at a height of 2 m on the planet
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A liquid takes 10 minutes to cool from 700 C to 500 C
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45
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The length of the scale is 20 cm
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6 s

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