Prelims

Cryogenic engines find applications in

Which one of the following pairs of materials serves as electrodes in chargeable batteries commonly used in devices such as torchlights, electric shavers, etc?

Optical fibre works on the principle of

Who among the following anticipated Newton by declaring that all things gravitate to the earth ?

Suppose a rocketship is receding from the earth at a speed of 2/10th the velocity of light. A light in the rocketship appears blue to the passengers on the ship. What colour would it appear to an observer on the earth?

When the same note is played on a sitar and a flute, the sound produced can be distinguished from each other because of the difference in

Assertion (A): A diamond sparkles more than a glass imitation cut to the same shape. Reason (R): The refractive index of diamond is less than that of glass. In the context of the above two statements, which one of the following is correct ?

The normal temperature of human body on the Kelvin scale is

A parachutist jumps from a height of 5000 metres. The relationship between his falling speed ‘v’ and the distance fallen through ‘d’ is best represented as

Which one of the following can be used to confirm whether drinking water contains a gamma emitting isotope or not?