Problem 23
Which of the following is not regarded as a pollutant? (a) \(\mathrm{CO}_{2}\) (b) \(\mathrm{O}_{3}\) (c) \(\mathrm{NO}_{2}\) (d) hydrocarbons
Problem 24
Which of the following is not a greenhouse gas? (a) water vapour (b) \(\mathrm{CO}_{2}\) (c) \(\mathrm{O}_{2}\) (d) \(\mathrm{CH}_{4}\)
Problem 25
The greenhouse effect is (a) rise in temperature of the earth (b) rise in pressure on the earth (c) decrease in oxygen content of the earth's atmo-sphere (d) decrease in CO \(_{2}\) content of earth's atmosphere
Problem 26
Which of the following is responsible for depletion of the ozone layer in the upper strata of the atmosphere? (a) freons (b) ferrocene (c) fullerenes (d) polyhalogens
Problem 27
Ozone in stratosphere is depleted by (a) \(\mathrm{C}_{7} \mathrm{~F}_{16}\) (b) \(\mathrm{C}_{6} \mathrm{~F}_{6}\) (c) \(\mathrm{CF}_{2} \mathrm{Cl}_{2}\) (d) \(\mathrm{C}_{6} \mathrm{H}_{6} \mathrm{Cl}_{6}\)
Problem 28
Which of the following is not an air pollutant? (a) \(\mathrm{N}_{2} \mathrm{O}\) (b) \(\mathrm{N}_{2}\) (c) \(\mathrm{CO}\) (d) \(\mathrm{NO}\)
Problem 29
Control of pollution is possible by (a) developing bio remedies (b) planting trees (c) controlling the population growth (d) all of these
Problem 31
Acid rain (a) retards the growth of trees (b) effects big marble constructions (c) results in loss of flora and fauna (d) all of these
Problem 32
The industrial usage of fluorocarbons is very high because (a) they are unstable (b) they are gases (c) they can be manufactured cheaply (d) their reactivity is high
Problem 33
Hydrosphere includes various forms of water as (a) polar ice caps and ground water (b) oceans and lakes (c) sea and rivers (d) all of these
