11. One electron volt equals to :
(a) 01.60 × 10^–19
(b) 09.11 × 10^–31
(c) 19.40 × 10^-10
(d) 01.16 × 10^–19
12. In germanium the majority of electrons are :
(a) 1.22 m^2/Vs
(b) 1.44 m^2/Vs
(c) 1.66 m^2/Vs
(d) 1.88 m^2/Vs
13. Which one of the following pair is correctly matched ?
(a) Mass spectroscopy – Chadwick
(b) Atomic number – Moseley
(c) Neutron – Millikan
(d) Measurement of charge of an electron – Aston
14. Impact ionization is a process of liberation of free electrons by breaking :
(a) Metallic bond
(b) Ionic bond
(c) Covalent bond
(d) van der Waals bond
15. The atomic number of silicon is :
(a) 14
(b) 16
(c) 18
(d) 12
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