Problem 45
Ozone layer of stratosphere requires protection from indiscriminate use of (a) aerosols and high flying jets (b) balloons (c) pesticides (d) atomic explosions
Problem 46
Sound pollution does not cause (a) mental disorder (b) hearing problems (c) headache (d) skin diseases
Problem 47
Proper management for disposal of household and industrial wastes can be done by (a) sewage treatment (b) recycling the waste material to give useful products again (c) burning and incineration of combustible waste (d) all of these
Problem 48
Contaminant is (a) a pollutant released from the industries (b) a pollutant (c) a component originally not present in environment but released into environment by human activity (d) a pollutant released into the environment in natural calamites
Problem 51
There is a possibility of melting of polar ice caps and increase in the level of sea water due to (a) greenhouse effect (b) acid rain (c) depletion of ozone layer (d) any one of these
Problem 52
Which of the following gases cause pollution when present in the exhaust fumes of vehicles? (a) water vapours (b) \(\mathrm{CO}_{2}\) (c) \(\mathrm{CO}\) (d) \(\mathrm{C}_{2} \mathrm{H}_{6}\)
Problem 53
The poisonous gas present in the exhaust fumes of car is (a) \(\mathrm{CO}_{2}\) (b) \(\mathrm{CO}\) (c) \(\mathrm{CH}_{4}\) (d) \(\mathrm{C}_{2} \mathrm{H}_{2}\)
Problem 54
Incomplete combustion of petrol or diesel in automobile engines can be best detected by testing the fuel gases for the presence of (a) sulphur dioxide (b) nitrogen dioxide (c) carbon monoxide (d) carbon monoxide and water vapour
Problem 55
Which one of the following regions of atmosphere contains ozone? (a) troposphere (b) stratosphere (c) mesosphere (d) thermosphere
Problem 56
The greenhouse effect is caused by (a) \(\mathrm{CO}\) (b) \(\mathrm{NO}\) (c) \(\mathrm{NO}_{2}\) (d) \(\mathrm{CO}_{2}\)
