Atoms and Electrons – 2 – 7

81. Which of the following is quantized according to Bohr’s theory of atom ?

(a) linear momentum of electron
(b) linear velocity of electron
(c) angular momentum of electron
(d) angular velocity of electron

ANSWER

EXPLANATION

82. An electron in the conduction band –

(a) Has a lower energy than an electron in the valence band
(b) Has a higher energy than an electron in the valence band
(c) Is located near the surface of the solid
(d) Is bound to its parent atom

ANSWER

EXPLANATION

83. Covalent band exists in –

(a) Copper
(b) NaCl crystal
(c) Silicon
(d) Arsenic

ANSWER

EXPLANATION

84. In a good conductor, the energy gap between the conduction band and the valence band is –

(a) Infinity
(b) Wide
(c) Narrow
(d) Zero

ANSWER

EXPLANATION

85. The forbidden energy band gap in conductors, semiconductor and insulators are EG1, EG2 and EG3 respectively then –

(a) EG1> EG2>EG3
(b) EG1< EG2< EG3
(c) EG1> EG2 = EG3
(d) EG1 = EG2 = EG3

ANSWER

EXPLANATION

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