2. Express unified atomic mass unit in kg.

3. How is average velocity different from instantaneous velocity?

4. What is the acceleration of projectile at the top of its trajectory?

5. A horse has to pull harder during the start of the motion than

later. Explain.

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

effect of length of the day be?

7. Give two examples of periodic motion which are not oscillatory?

8. If an iron wire is stretched by 1%, what is the strain on the wire?

9. What is green house effect? Explain global warming?

10. Explain the concept of degrees of freedom for molecules of a gas.

11. A car travels first one 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. Explain reversible and irreversible processes. Describe the

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

13. Mention the methods used to decrease the friction.

14. Define vector product. Explain properties of vector product with

two examples.

15. Obtain an equation for the frequency of oscillation of force

constant 'k' to which a mass 'm' is attached.

16. Explain the concept of Elastic Potential energy in a stretched

wire and hence obtain the expression for it.

17. Explain Surfacetension and Surface energy.

18. In what way anomalous behaviour of water advantageous to aquatic animals?

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

freely falling body.

(b) A machine gun fires 360 bullets per minute. Each bullet travels

with a velocity of 600 m/ s. If the mass of each bullet is 5 gm. Find

the power of machine gun.

20. (a) State and prove parallel axes theorem. (b) Find the vector

product of two vectors

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