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Atoms and Electrons – 2 – 6

76. The electrons in the conduction band are known as ……..

(a) bound electrons
(b) valence electrons
(c) free electrons
(d) none of the above

ANSWER

EXPLANATION

77. In insulators, the energy gap between valence and conduction bands is ……..

(a) very large
(b) zero
(c) very small
(d) none of the above

ANSWER

EXPLANATION

78. In a conductor, the energy gap between valence and conduction bands is ……..

(a) large
(b) very large
(c) very small
(d) none of the above

ANSWER

EXPLANATION

79. According to Bohr’s theory of atom, an electron can move in an orbit of ……..

(a) any radius
(b) certain radius
(c) some range of radii
(d) none of the above

ANSWER

EXPLANATION

80. The energy gap between valence and conduction bands in insulators is about ……..

(a) 15 eV
(b) 1.5 eV
(c) zero
(d) 0.5 eV

ANSWER

EXPLANATION

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