11. One end of a helical spring is fixed while the other end carries the load *W* which moves with simple harmonic motion. The frequency of motion is given by(where δ = Deflection of the spring.)

12. The angle of inclination with the vertical is __________ if the cyclist is running at a faster speed than that when he is running at a slower speed.

A. more

B. less

13. The range of projectile(*R*) on an upward inclined plane is

14. The center of gravity of a right circular solid cone is at a distance of __________ from its base, measured along the vertical axis. (where *h* = Height of a right circular solid cone.)

A. *h*/2

B. *h*/3

C. *h*/4

D. *h*/6

15. In actual machines, mechanical advantage is __________ velocity ratio.

A. equal to

B. less than

C. greater than

16. The radius of gyration is the distance where the whole mass (or area) of a body is assumed to be concentrated.

A. Correct

B. Incorrect

17. If three coplanar forces acting on a point are in equilibrium, then each force is proportional to the sine, of the angle between the other two.

A. Correct

B. Incorrect

18. A rubber ball is dropped from a height of 2 m. If there is no loss of velocity after rebounding, the ball will rise to a height of

A. 1m

B. 2m

C. 3m

D. 4m

19. In the shown figure, the tension (*T*) in the string will be

20. When the spring of a watch is wound, it will possess

A. strain energy

B. kinetic energy

C. heat energy

D. electrical energy