Which one of the following is a simple harmonic motion ?

The potential energy of a long spring when stretched by 2 cm is U.  If the spring is stretched by 8 cm the potential energy stored in it is:

A horizontal surface moves up and down in S.H.M with an amplitude of 1 cm.  If mass of 10 kg (which is placed on the surface) is to remain continuously in contact with it, the maximum frequency of S.H.M. will be:

A particle of mass 10 g is executing S.H.M, with an amplitude of 0.5 m and periodic time of second.  The maximum value of force acting on the particle is:

A body is executing SHM.  When the displacements from the mean position is 4 cm and 5 cm, the corresponding velocities are 10 cm/s and 8cm/s.  Then the time period of the body is:

The displacement a of particle between maximum potential energy position and maximum kinetic energy position in simple harmonic motion is:

Two simple harmonic motions given by,
act on a particle simultaneously, then the motion of particle will be

A simple pendulum with a bob of mass m oscillates from A to C and back to A [See Fig.] such that PB is H.  If the acceleration due to gravity is g then the velocity of the bob as it passes through B is:

The acceleration of a particle performing S.H.M. is 12 cm/sec² at a distance of 4 cm from the mean position. The time period will be :

A particle is performing simple harmonic motion along the x axis with amplitude 4 cm and time period 1.2 sec.  The minimum time taken by the particle to move from x = + 2 cm to x = + 4 cm and back again is: