Applied Mechanics and Graphic Statics
Pick up the correct statement from the following. A rubber ball when strikes a wall rebounds but a lead ball of same mass and velocity when strikes the same wall, falls down

Rubber and lead balls undergo equal changes in momentum
None of these
Change in momentum suffered by lead ball is less that of rubber ball
Momentum of rubber ball is less than that of lead ball

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Applied Mechanics and Graphic Statics
The force acting on a point on the surface of a rigid body may be considered to act

At the centre of gravity of the body
At any point on the surface normal to the line of action of the force
On any point on the line of action of the force
On the periphery of the body

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Applied Mechanics and Graphic Statics
One end of an elastic string of natural length ‘l’ and modulus ‘X’ is kept fixed while to the other end is attached a particle of mass m which is hanging freely under gravity. The particle is pulled down vertically through a distance ‘x’, held at rest and then released.The motion is

A damped oscillatory motion
A rectilinear motion with constant speed
None of these
A simple harmonic motion

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