General Science Questions and Answers for TNPSC - 3

Question: 11

Photon is a

(A) particle

(B) wave

(C) neither a particle nor a wave

(D) either a particle or a wave

Question: 12

Electron beam operates in _____ medium.

(A) air

(B) inert gas

(C) vacuum

(D) all of the above

Question: 13

At the threshold frequency, the velocity of the electrons is

(A) maximum

(B) minimum

(C) infinite

(D) zero

Question: 14

The stopping potential of a metal surface is independent of

(A) frequency of incident radiation

(B) velocity of the electrons emitted

(C) the nature of the metal surface

(D) intensity of incident radiation

Question: 15

Work function of a photo metal is defined as the minimum amount of _____ required to liberate an electron from the metal surface.

(A) intensity

(B) potential

(C) frequency

(D) energy