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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
Answer : (a)
Explanation
No answer description available for this question. Let us discuss.

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
Answer : (c)
Explanation
No answer description available for this question. Let us discuss.

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
Answer : (c)
Explanation
No answer description available for this question. Let us discuss.

4. Dislocations are :

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

Answer
Answer : (a)
Explanation
No answer description available for this question. Let us discuss.

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

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

Answer
Answer : (a)
Explanation
No answer description available for this question. Let us discuss.

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