environmental chemistry - Category wise Question and Answer Practice Test with Solutions

Question : 16 [NDA]

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 : 17

Which of the following statements about polar stratosphere clouds (PSCs) is not correct?

a) Type I clouds are formed at about –77ºC and contain solid HNO₃ . 3H₂O

b) Type II clouds are formed at about –85ºC and contain some ice

c) PSCs do not react with chlorine nitrate and HCl

d) A tight whirlpool of wind called Polar Vortex is formed which surrounds Antarctica

Question : 18 [CDS]

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 : 19

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 : 20

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