Physics Questions

Which of the following pairing is incorrect

If the velocity of a body is halved its kinetic energy ________________.

Optical fiber works on the principle of -

_________ is a natural electrical phenomenon characterized by the appearance of streamers of reddish or greenish light in the sky, especially near the northern or southern magnetic pole.

The tendency of undisturbed objects to stay at rest or to keep moving with the same velocity is called ___

A car accelerates uniformly from 18 kmph to 72 kmph in 5 s. The acceleration of the car (in m/sq.s) is:

If the acceleration due to gravity on the surface of earth is g, then the acceleration due to gravity on the surface of a planet whose mass is same as that of earth and radius is half as that of earth is _________________.

As a sailor jumps in the forward direction, the boat moves backwards. This example illustrates Newton's :