1. . The mode of transfer of heat from layer to layer without any visible motion of particles is called:
(A) Conduction
(B) Convection
(C) Radiation
(D) None of these
2. . Heat from the Sun travels through space and reaches the Earth by:
(A) Conduction
(B) Convection
(C) Radiation
(D) All of these
3. . On which part of the photoelectric cell does the light strike?
(A) Cathode
(B) Anode
(C) Ammeter
(D) None of these
4. . X–rays are similar in nature to:
(A) Cathode rays
(B) Positive rays
(C) Gamma rays
(D) Alpha rays
5. . Modes of transfer of heat are:
(A) Conduction
(B) Convection
(C) Radiation
(D) All of these
6. . Transfer of heat from one part to another part by actual movement of particles is known as:
(A) Radiation
(B) Conduction
(C) Convection
(D) None of these
7. . According to Stefan-Boltzmann law:
(A) E = σ T⁴
(B) E = σ T³
(C) E = σ T²
(D) E = σ T
8. . Velocity of X–rays is equal to that of:
(A) α–rays
(B) Light–rays
(C) Sound
(D) None of these