A small amount of air is introduced into the vacuum above the mercury in a mercury barometer tube. The mercury level goes down because the air molecules

Which of the following quantities is a vector?

In an elastic collision, momentum is conserved as well as well as?

Which of the following instruments can be used to compare the magnitudes of charges on two given bodies?

The time rate of increase in velocity is called

Which of the following waves is not mechanical?

A loaded spring is set in simple harmonic motion. The force that tends to restore the load to its equilibrium position is

A body of mass 2 kg is released from a point 100 m above the ground. Calculate its kinetic energy 80m from the point of release.

The induced current in a coil always flows in a direction so as to oppose the change that causes it. This statement is known as