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Atoms and Electrons – 2 – 5

71. 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

72. 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

73. 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

74. The electrons in the third orbit of an atom have …….. energy than the electrons in the second orbit.

(a) more
(b) less
(c) the same
(d) none of the above

ANSWER

EXPLANATION

75. When an electron jumps from higher orbit to a lower orbit, it …….. energy.

(a) absorbs
(b) emits
(c) sometimes emits, sometimes absorbs
(d) none of the above

ANSWER

EXPLANATION

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