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Introduction to Material Science – 1 – 1

1. Which type of the following structures contains two atoms per cell ?

(a) body centered cubic
(b) face centered cubic
(c) single cubic cell
(d) none of the above

ANSWER

EXPLANATION

2. The covalent crystals are characterized by :

(a) good electrical conductivity and low hardness
(b) good electrical conductivity and high hardness
(c) poor electrical conductivity and high hardness
(d) poor electrical conductivity and low hardness

ANSWER

EXPLANATION

3. 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

ANSWER

EXPLANATION

4. Dislocations are :

(a) line defects
(b) planar defects
(c) point defects
(d) chemical defects

ANSWER

EXPLANATION

5. In the case of insulators, as the temperature decreases, its resistivity :

(a) increases
(b) decreases
(c) becomes zero
(d) remains unaltered

ANSWER

EXPLANATION

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