subject. The model paper is useful for the students of Telangana and

Andhra Pradesh Inter Boards. Duration of the exam will be 3 hours and

maximum marks are 60 only.

SECTION - A

I. i) Answer ALL questions.

ii) Each carries 2 marks.

iii) All are very short answer type questions. 10 × 2 = 20

1. What is the contribution of S. Chandra Sekhar to physics?

2. Distinguish between accuracy and precision.

3. If A = i + j, then find the angle made by the vector A with X - axis.

4. Why does the car with a flattened tyres stop sooner than the one

with inflated tyres?

5. If the polar ice caps of the earth were to melt, what would the

effect of the length of the day be?

6. Why should a helicopter necessarily have two propellers?

7. What is magnus effect?

8. Give the expression for the excess pressure in an air bubble inside

the liquid.

9. Why gaps are left between adjacent rails on a railway track?

10. What is specific gas constant? Is it same for all gases?

SECTION - B

II. i) Answer any SIX questions.

ii) Each carries 4 marks.

iii) All are short answer type questions. 6 × 4 = 24

11. A car travels the first third of a distance with a speed of

10 kmph, the second third at 20 kmph and the last third at 60 kmph.

What is its mean speed over the entire distance?

12. Show that the trajectory of an object thrown at certain angle with

the horizontal is a parabola.

13. Why is pulling the lawn roller preferred to pushing it?

14. Define angular velocity. Derive V = r..

15. What is escape velocity? Obtain an expression for it.

16. Define strain energy and derive the evaluation for the same.

17. A body cools from 60°C to 40°C in 7 minutes. What will be its

temperature after next 7 minutes if the temperature of its surrounding

is 10°C?

18. Prove that the average kinetic energy of a molecule of an ideal

gas is directly proportional to the absolute temperature of the gas.

SECTION - C

III. i) Answer any TWO of the following.

ii) Each carries 8 marks.

iii) All are long answer type questions. 2 × 8 = 16

19. (a) State and prove law of conservation of mechanical energy in

the case of a freely falling body.

(b) A machine gun fires 360 bullets per minute and each bullet travels

with a velocity of 600 ms-1. If the mass of each bullet is 5 gm, find

the power of the machine gun.

20. Derive the equation for the kinetic energy and potential energy of

a simple harmonic oscillator and show that the total kinetic energy of

a particle in simple harmonic motion is constant at any point on its

path.

21. Explain the reversible and irreversible processes. Describe the

working of Carnot engine. Obtain an expression for the efficiency.

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