State three properties of lasers that make them preferable to ordinary light beam.

How would the capacitance of a parallel plate capacitor be affected if the distance of separation of its plates is decreased? It will

Which of the following machines does not apply the lever principle?

The average distance moved by a molecule between collisions is called

Which of the following waves requires a material medium for its propagation?

An image formed on a screen is always?

The volume of a fixed mass of a gas varies inversely as the pressure on it provided the temperature is constant. This statement is

In collision between two objects, kinetic energy is conserved only if

The quantity of motion of a body is its