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Prisha Laxmi
@prisha-laxmi
Estimable Member
Joined: Mar 13, 2022
Last seen: May 1, 2022
Topics: 0 / Replies: 163
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Answer to: Lichens do not like to grow in cities

Correct answer: (c) because of SO2 pollution Explanation: Because lichens are very sensitive to sulphur dioxide and in cities the amount of SO2 is...

2 years ago
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Answer to: Which among the following statements is false? (a) Oil slick in sea water increases D.O. value

Correct answer: (a) Oil slick in sea water increases D.O. value Explanation: Oil slick in sea water decreases D.O value.

2 years ago
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Answer to: In a coal fired power plant, electrostatic precipitators are installed to control emission of

Correct answer: (c) SPM Explanation: SPM → Suspended particulates matter.

2 years ago
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Answer to: Which one of the following substances used in dry cleaning is a better strategy to control environmental pollution?

Correct answer: (d) Tetrachloroethylene Explanation: Tetrachloroethylene is widely used for dry cleaning fabrics and metal degreasing operations.

2 years ago
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Answer to: The irritant red haze in the traffic and congested places is due to presence of which of the following?

Correct answer: (c) (ii) only Explanation: The irritant red haze in the traffic and congested places is due to presence of oxides of nitrogen.

2 years ago
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Answer to: Which of the following statements about polar stratosphere clouds (PSCs) is not correct?

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.

2 years ago
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Answer to: Presence of which of the following fuel gas in the exhaust fumes shows incomplete combustion of fuel?

Correct answer: (c) Carbon monoxide Explanation: Presence of CO in the exhaust fumes shows incomplete combustion.

2 years ago
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Answer to: The smog is essentially caused by the presence of

Correct answer: (a) oxides of sulphur and nitrogen Explanation: Smog is caused by oxides of sulphur and nitrogen.

2 years ago
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Answer to: Which one of the following statements is not true? (a) Dissolved oxygen (DO) in cold water can reach a concentration upto 10 ppm.

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...

2 years ago
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Answer to: Ozone hole refers to (a) increase in concentration of ozone. (b) hole in ozone layer.

Correct answer: (d) reduction in thickness of ozone layer in stratsophere. Explanation: Ozone hole is reduction in ozone layer in stratosphere.

2 years ago
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Answer to: Identify the wrong statement in the following: (a) Chlorofluorocarbons are responsible for ozone layer depletion.

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 ...

2 years ago
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Answer to: High concentration of which of the following in atmosphere leads to stiffness of flower buds which eventually fall off from plants?

Correct answer: (b) SO2 Explanation: High concentration of SO2 leads to stiffness of flower buds.

2 years ago
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Answer to: Which of the following can control the photochemical smog?

Correct answer: (c) A and B Explanation: Usually catalytic converters are used in the automobiles, which prevent the release of nitrogen oxide and...

2 years ago
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Answer to: Carbon monoxide (CO) is harmful to man because

Correct answer: (d) it competes with O2 for haemoglobin. Explanation: CO is highly toxic and impairs respiration. CO combines with haemoglobin of ...

2 years ago
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Answer to: The greenhouse effect is because of the

Correct answer: (a) presence of gases, which in general are strong infrared absorbers, in the atmosphere Explanation: Green house gases such as CO...

2 years ago
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Answer to: Green house gases (a) allow shorter wavelength to enter earth's atmosphere while doesn't allow longer

Correct answer: (a) allow shorter wavelength to enter earth's atmosphere while doesn't allow longer wavelength to leave the earth's atmosphere. Expl...

2 years ago
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Answer to: The statement which is not correct about control of particulate pollution:

Correct answer: (a) In electrostatic precipitator, the particulates are made to acquire positive charge which are then attracted by the negative elect...

2 years ago
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Answer to: Ozone is an important constituent of stratosphere because it

Correct answer: (d) absorbs ultraviolet radiation which is harmful to human life. Explanation: Ozone absorbs U.V. radiations harmful to human life...

2 years ago
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Answer to: In Antarctica ozone depletion is due to the formation of following compound

Correct answer: (a) acrolein Explanation: In antarctica, ozone depletion is due to formation of acrolein.

2 years ago
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