set 1 MCQ Questions & Answers Detailed Explanation

Question : 1

Which one of the following polymeric materials is used for making bullet proof jacket?

a) Kevlar

b) Rayon

c) Nylon-6, 6

d) Dacron

Question : 2

What is the role of ultraviolet (UV) radiation in the water purification system?

1. It inactivates / kills the harmful micro-organisms in water.
2. It removes all the undesirable odours from the water.
3. It quickens the sedimentation of solid particles and improves the clarity of water.

a) 2 and 3 only

b) 1 only

c) 1 and 3 only

d) 1, 2 and 3

Question : 3

Presence of which of the following fuel gas in the exhaust fumes shows incomplete combustion of fuel?

a) Carbon monoxide and water vapour

b) Sulphur dioxide

c) Carbon monoxide

d) Nitrogen dioxide

Question : 4

What is the composition of nitrolim – a chemical fertilizer?

a) Calcium carbide and carbon

b) Calcium carbide and nitrogen

c) Nitrogen and limestone

d) None of the above

Question : 5

The layer which reflects radio signals back to earth is –

a) Ionosphere

b) Troposphere

c) Ozone layer

d) Stratosphere

Question : 6

CO₂ absorbs some of the ............. that radiates from the surface of Earth to space –

a) ultraviolet light

b) heat

c) ozone

d) smog