Introduction to Material Science – Exercise – 1

Introduction to Material Science » Exercise – 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
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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
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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
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4. Dislocations are :

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

Answer
Answer : (a)
Explanation
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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
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