set 3 MCQ Questions & Answers Detailed Explanation

Question : 1

Which one of the following substances is used in the manufacture of safety matches?

a) Phosphorus trioxide (P203)

b) White phosphorus

c) Red phosphorus

d) Black phosphorus

Question : 2

Which of the following is/are the hazardous pollutant(s) present in automobile exhaust gases?

1. N₂
2. CO
3. CH₄
4. Oxides of nitrogen

a) (i) and (ii)

b) (ii) and (iv)

c) (ii) and (iii)

d) (i) and (iii)

Question : 3

What is a mixture of potassium nitrate, powdered charcoal and sulphur called ?

a) Paint

b) Cement

c) Glass

d) Gun power

Question : 4

Which of the following substances is/are ozone depleting?

1. Chlorofluorocarbons
2. Halons
3. Carbon tetrachloride

a) 1 and 2

b) 1 only

c) 2 and 3

d) 1, 2 and 3

Question : 5

The polymeric fibre used as a substitute for wool in making synthetic blankets, sweaters, etc., is

a) orlon

b) teflon

c) nylon

d) Bakelite

Question : 6

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) PSCs do not react with chlorine nitrate and HCl

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

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