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Learn UPSC MCQs with answers [Page 3 of Department 79]

Babita • 7.55K Points
Tutor III

21) Which of the following is usually not an air-pollutant?

(A) Hydrocarbons

(B) Sulphur dioxide

(D) Nitrous oxide

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Correct Answer - Option (D)

Explanation :
The six air pollutants are carbon monoxide, lead, ground-level ozone, nitrogen dioxide, particulate matter, and sulfur dioxide.The combustion of gasoline and other hydrocarbon fuels in automobiles, trucks, and jet airplanes produces several primary air pollutants. Nitrous oxide (N2O), commonly known as laughing gas, is used in surgery and dentistry for its anaesthetic and analgesic effects.

Babita • 7.55K Points
Tutor III

22) Which of the following pollutants is main product of automobile exhaust ?

(A) CO

(B) CO2

(D) Hydrocarbons

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Correct Answer - Option (C)

No Explanation found. Add Explanation and get +2 points.

Babita • 7.55K Points
Tutor III

23) The smog is essentially caused by the presence of

(A) O3 and N2

(B) O2 and N2

(D) O2 and O3

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Correct Answer - Option (C)

No Explanation found. Add Explanation and get +2 points.

Babita • 7.55K Points
Tutor III

24) The depletion in Ozone layer is caused by ________ .

(A) Nitrous oxide

(B) Carbon dioxide

(D) Methane

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Correct Answer - Option (C)

No Explanation found. Add Explanation and get +2 points.

Babita • 7.55K Points
Tutor III

25) Which of the following is the maximum number of electrons that can be present in M-shell?

(A) 2

(B) 8

(D) 32

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Correct Answer - Option (C)

No Explanation found. Add Explanation and get +2 points.

Babita • 7.55K Points
Tutor III

26) Atoms of different elements have

(A) Same atomic number and same electronic configuration

(B) Different atomic number and same eletronic configu-ration

(D) Same number of electrons and neutrons

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Correct Answer - Option (C)

No Explanation found. Add Explanation and get +2 points.

Shivam • 8.86K Points
Tutor III

27) Smog is likely to occur ________

(A) Around valleys

(B) Near lakes

(D) Near the industrial areas

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Correct Answer - Option (D)

Explanation :
Smog was common in industrial areas, and remains a familiar sight in cities today. Industrial smog typically exists in urban areas where factories burn fossil fuels such as coal, which creates smoke and sulfur dioxide that mix with fog droplets to create a thick blanket of haze close to the ground.

Shivam • 8.86K Points
Tutor III

28) The cauliflower shape is associated with which of the following cloud formations?

(A) Stratus

(B) Cumulus

(D) Cirrus

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Correct Answer - Option (B)

Explanation :
When the top of the cloud begins to look like a head of cauliflower, it's called a cumulus congestus or a towering cumulus. The fluffy, cauliflower-shaped cumulus are one of the most common and distinctive types of cloud. All cumulus clouds develop as a result of convection.

Shivam • 8.86K Points
Tutor III

29) Heat gain through insolation and heat loss through terrestrial radiation are equal approximately at which latitude?

(A) 22° W North and South

(B) 40° North and South

(D) 66° W North and South

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Correct Answer - Option (B)

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Shivam • 8.86K Points
Tutor III

30) Increase in carbon dioxide in atmosphere causes ________

(A) Rise in earth temperature

(B) Fall in earth temperature

(D) Increase in Ultraviolet rays

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Correct Answer - Option (A)

No Explanation found. Add Explanation and get +2 points.

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