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
Answer : (c)

EXPLANATION
No answer description available for this question. Let us discuss.

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
Answer : (b)

EXPLANATION
No answer description available for this question. Let us discuss.

83. Covalent band exists in –

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

ANSWER
Answer : (c)

EXPLANATION
No answer description available for this question. Let us discuss.

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
Answer : (d)

EXPLANATION
No answer description available for this question. Let us discuss.

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
Answer : (b)

EXPLANATION
No answer description available for this question. Let us discuss.

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