11.A seconds pendulum is mounted in a rocket. Its period of oscillation will decrease when the rocket is:

12.A particle executes SHM, its time period is 16 s. If it passes through the centre of oscillation, then its velocity is 2 m/s at time 2 s. The amplitude will be:

13.If the mass of bob of simple pendulum is increased by 50%, the time period of the pendulum:

14.A particle moves along y-axis according to equation y = 3 + 4 cos wt. The motion of particle is:

15.If a particle is acted by two simple harmonic motions simultaneously, the path of particle is: