1. Which of the following is not essential for S.H.M.?

2. The restoring force acting on the particle executing S.H.M. is

3. In S.H.M, the vibration of which of the following is not a sine curve?

4. The equation of motion of a particle is x = a cos (αt)². The motion is

5. If the length of seconds pendulum is increased by 2%, how may seconds it will lose per day?

6. In SHM, graph of which of the following is a straight line?

7. If a hole is bored along the diameter of the earth and a stone is dropped into the hole

8. The displacement of a particle is represented by the equation y = sin³ ωt. The motion is

9. The bob of a simple pendulum is a spherical hollow ball filled with water. A plugged hall near the bottom of the oscillating bob gets suddenly unplugged. During observation, till water is coming out, the time -period of the oscillation would

10. The maximum velocity for particle in SHM is 0.16 m/s and maximum acceleration is 0.64 m/s². The amplitude is

11.  A particle executing SHM has a maximum speed of 30 cm/s and a maximum acceleration of 60 cm/s². The period of oscillation is

12. Damping in oscillatory motion is caused by

13. If a simple harmonic oscillator has got a displacement of 0.02 m and acceleration equal to 2.0 ms^-2 at any time, the angular frequency of the oscillator is equal to

14. A particle is acted simultaneously by mutually perpendicular simple harmonic motions x = a cos ωt and y = a sin ωt. The trajectory of motion of the particle will be

15. The period of thin magnet is 4 sec. if it is divided into two equal halves then the time period of each part will be

16. Length of a simple pendulum executing simple harmonic motion is increased by 21%. The percentage increase in the time – period of the pendulum of increased length is

17. The displacement of a particle varies with time according to the relation y = a sin ωt + b cos ωt

18.  The displacement of a particle is represented by the equation y = 3 cos(π/4 – 2ωt). The motion of the particle is

19. The amplitudes of two similar pendulums are 2 cm and 5 cm. The ratio of their energies is

20. The period of a simple harmonic oscillator is 2 sec. The ratio of its maximum velocity and maximum acceleration is