Physics Test - ...

A copper sphere of mass \(2 {~g}\) contains nearly \(2 \times 10^{22}\) atoms. The charge on the nucleus of each atom is 29 e. What fraction of the electrons must be removed from the sphere to give it a charge of \(+2 \mu C\) ?

The mean distance of mars from the sun is 1.5 times that of earth from the sun. What is approximately the number of years required by mars to make one revolution about the sun?

A Nicol prism is based on the principle of:

A particle of mass m is moving along the x-axis such that its velocity is given by \(v=k \sqrt{x}\). The work done by the force during the first t seconds is:

Two resistances of 10 Ω and 30 Ω are parallel connected in a circuit. The equivalent resistance of the circuit will be:

An equilateral triangle is made of three wires of equal resistances 4 Ω. Find the equivalent resistance across any one side.

Current sensitivity of a moving coil galvanometer is 5 div/mA and its voltage sensitivity (angular deflection per unit voltage applied) is 20 div/V. The resistance of the galvanometer is:

A circular coil A of radius ‘a’ carries current ‘I’. Another circular coil B of radius ‘2a’ also carries the same current of ‘I’. The magnetic fields at the centers of the circular coils are in the ratio of:

The Electromagnetic Waves are:

In a common base mode if the collector and base current are 1.95 mA and 0.5 mA, then the emitter current will be: