Problem 11
The permissible level of a pollutant by a healthy person exposed for eight hours is called (a) pollutant limit value (b) toxie limit value (c) threshold limit value (d) contaminant limit value
Problem 12
The permissible level of a pollutant by a healthy person exposed for eight hours is called (a) pollutant limit value (b) toxie limit value (c) threshold limit value (d) contaminant limit value
Problem 13
The green house gas is (a) \(\mathrm{CO}_{2}\) (b) Chlorofluorocarbons (c) \(\mathrm{O}_{3}\) (d) All
Problem 14
The wrong statcment among the following is (a) Ozone layer protects the life on earth from \(U \mathrm{~V}\) radiations. (b) CO combines with haemoglobin forming carboxyhaemoglobin and interferes with functioning of haemoglobin leading to death. (c) \(\mathrm{SO}_{2}\) pollution causes decrease in photosynthesis rate. (d) The holes in ozone layer are formed by hydrocarbons.
Problem 15
The grecn housc effect is (a) rise in pressure on carth (b) decrease in oxygen content on the earth's atmosphcre (c) rise in tempcrature of carth (d) decrease in \(\mathrm{CO}_{2}\) content of earth atmosphere
Problem 16
Acid rain (a) causes loss of flora and fauna (b) retards the growth of trees (c) effects big marble constructions (id) a] the above
Problem 17
The correct statement among the following is (a) Ozone layer is harmful when present in troposphere and protects life when present in stratosphere. (b) The industrial usage of fluorocarbons is very high because they can be manufactured cheaply. (c) Acid rains contain the oxoacids of sulphur and nitrogen. (d) All are correct.
Problem 18
Lung diseases are four times more in urban areas than in rural areas. This is due to the presence of (a) \(\mathrm{SO}_{2}\) (b) \(\mathrm{CO}_{2}\) (c) \(\mathrm{N}_{2}\) (d) Water vapour
Problem 21
Which of the following is false statement about grecn house cffect? (a) It is due to high concentration of \(\mathrm{CO}_{2}\) in atmosphere. (b) It is influenced by gases such as \(\mathrm{CH}_{4}, \mathrm{O}_{3}\) and chloroflouro carbons. (c) It results in the warming up of the earth. (d) It would result in lowering the level of oceans due to high evaporation.
Problem 23
CO seems to be removed from the atmosphere mostly by (a) dissolving in the oceans (b) reacting with \(\mathrm{O}_{2}\) to from \(\mathrm{CO}_{2}\) (c) thermal decomposition to carbon and oxygen (d) consumption by soil microorganisms
