Last seen: May 1, 2022
Correct answer: (c) because of SO2 pollution Explanation: Because lichens are very sensitive to sulphur dioxide and in cities the amount of SO2 is...
Correct answer: (a) Oil slick in sea water increases D.O. value Explanation: Oil slick in sea water decreases D.O value.
Correct answer: (c) SPM Explanation: SPM → Suspended particulates matter.
Correct answer: (d) Tetrachloroethylene Explanation: Tetrachloroethylene is widely used for dry cleaning fabrics and metal degreasing operations.
Correct answer: (c) (ii) only Explanation: The irritant red haze in the traffic and congested places is due to presence of oxides of nitrogen.
Correct answer: (a) PSCs do not react with chlorine nitrate and HCl. Explanation: PSCs react with chlorine nitrate and HCl to give HOCl and Cl2.
Correct answer: (c) Carbon monoxide Explanation: Presence of CO in the exhaust fumes shows incomplete combustion.
Correct answer: (a) oxides of sulphur and nitrogen Explanation: Smog is caused by oxides of sulphur and nitrogen.
Correct answer: (d) When the pH of rain water is higher than 6.5, it is called acid rain. Explanation: Acid rain is the rain water containing sulp...
Correct answer: (d) reduction in thickness of ozone layer in stratsophere. Explanation: Ozone hole is reduction in ozone layer in stratosphere.
Correct answer: (d) Ozone layer does not permit infrared radiation from the sun to reach the earth. Explanation: Ozone layer acts as a shield and ...
Correct answer: (b) SO2 Explanation: High concentration of SO2 leads to stiffness of flower buds.
Correct answer: (c) A and B Explanation: Usually catalytic converters are used in the automobiles, which prevent the release of nitrogen oxide and...
Correct answer: (d) it competes with O2 for haemoglobin. Explanation: CO is highly toxic and impairs respiration. CO combines with haemoglobin of ...
Correct answer: (a) presence of gases, which in general are strong infrared absorbers, in the atmosphere Explanation: Green house gases such as CO...
Correct answer: (a) allow shorter wavelength to enter earth's atmosphere while doesn't allow longer wavelength to leave the earth's atmosphere. Expl...
Correct answer: (a) In electrostatic precipitator, the particulates are made to acquire positive charge which are then attracted by the negative elect...
Correct answer: (d) absorbs ultraviolet radiation which is harmful to human life. Explanation: Ozone absorbs U.V. radiations harmful to human life...
Correct answer: (a) acrolein Explanation: In antarctica, ozone depletion is due to formation of acrolein.
Correct answer: (c) Chlorine Explanation: