46. Mobility of electron is highest in :
(a) Silicon
(b) Germanium
(c) Gallium arsenide
(d) Carbon
47. The nature of atomic bond found in diamond is :
(a) Tetravalent
(b) Covalent
(c) Metallic
(d) Ionic
48. Facing fraction of simple cube is :
(a) 6.48
(b) 0.52
(c) 0.65
(d) 0.89
49. According to Coulomb’s first law :
(a) Like charges attract each other
(b) Like charges repel each other
(c) There is no force between the charges
(d) None of these
50. When an electron moves from lower orbit to a higher orbit :
(a) Emission of energy takes place
(b) Absorption of energy takes place
(c) Size of atom increases
(d) Either absorption or emission of energy takes place
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