Physics Test - ...

A body of mass 10kg at rest is acted upon simultaneously by two forces 4N and 3N at right angles to each other. The kinetic energy of the body at the end of 10 s is:

Which of the following are quick electron emissions?

A ray is incident at an angle of incidence \(i\) on one surface of a small angle prism (with the angle of prism \({A}\)) and emerges normally from the opposite surface. If the refractive index of the material of the prism is \(\mu\). Then the angle of incidence is nearly equal to:

A body is thrown vertically upwards. If air resistance is to be taken into account, then the time during which the body rises is:

Two waves represented by \(\mathrm{y}_{1}=10 \sin (2000 \pi \mathrm{t})\) and \(\mathrm{y}_{2}=10 \sin (2000 \pi \mathrm{t}+\frac{\pi}{2})\) are superimposed at any point at a particular instant. The resultant amplitude is:

Calculate the M.l. of a thin uniform ring about an axis tangent to the ring and in a plane of the ring, if its M.I. about an axis passing through the centre and perpendicular to plane is \(4 \mathrm{~kgm}^{2}\).

A smooth sphere of mass \(m\) strikes a second sphere of mass \(2m\) which is at rest. After the collision their directions of motion are at right angles. Then the coefficient of restitution is:

In case of steady electric field in between region of the parallel plate capacitor. The magnitude of displacement current is:

A body of M.I. of \(3 \mathrm{~kg}\mathrm{m}^{2}\), rotating with an angular velocity of \(2 \mathrm{rad} / \mathrm{s}\), has the same K.E. as a mass of \(12 \mathrm{~kg}\) moving with a velocity of:

There is a simple pendulum hanging from the ceiling of a lift. When the lift is standstill, the time period of the pendulum is \(T\). If the resultant acceleration becomes \(\frac{g }{ 4}\), then the new time period of the pendulum is: