MCQs

Ozone Questions with solutions MCQs

1. The Ozone gas found in which of the following layers of the atmosphere absorbs harmful UV radiations and prevents them from reaching the earth`s surface?

A

Troposphere

B

Stratosphere

C

Mesosphere

D

Thermosphere

Ozone General Science
Correct Answer : B
Explanation :

Most ozone (about 90%) is found in the stratosphere, which begins at about 10–16 kilometres above Earth`s surface and extends to an altitude of about 50 kilometres. Ozone in the stratosphere protects life on Earth from harmful ultraviolet (UV) radiation and is therefore often called good ozone.

Correct Answered :

Wrong Answered :

2. What is the unit of measurement for the total amount of ozone in the atmosphere above a point on the earth`surface

A

Dobson Unit

B

Darson Unit

C

Datsun Unit

D

Dalton Unit

Ozone General Science
Correct Answer : A
Explanation :

The Dobson Unit is the most common unit for measuring ozone concentration.

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Wrong Answered :

3. Ozone acts as an air pollutant and becomes harmful to the living organisms when present in which of the following layers of the atmosphere?

A

Ionosphere

B

Troposphere

C

Stratosphere

D

Mesosphere

Ozone General Science VERIFIED
Correct Answer : B
Explanation :

Ozone in the stratosphere protects life on Earth from harmful ultraviolet (UV) radiation and is therefore often called good ozone. This is in contrast to ozone in the troposphere, the lowest layer of the atmosphere, where it is an air pollutant and can be harmful to humans, animals and vegetation.

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4. Which of the following is the primary Ozone depleting chemical?

A

Methane

B

Chorofluorocarbon

C

Carbon dioxide

D

Carbon monoixe

Ozone JKPSI 2022 CBT
Correct Answer : B
Explanation :

Ozone depleting substances include:

  1. chlorofluorocarbons (CFCs)
  2. hydrochlorofluorocarbons (HCFCs)
  3. hydrobromoflurocarbons (HBFCs)
  4. halons
  5. methyl bromide
  6. carbon tetrachloride
  7. methyl chloroform.

They have been used as:

  1. refrigerants in commercial, home and vehicle air conditioners and refrigerators
  2. foam blowing agents
  3. components in electrical equipment
  4. industrial solvents
  5. solvents for cleaning (including dry cleaning)
  6. aerosol spray propellants
  7. fumigants.

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5. Bad ozone or ground level ozone is which of the following?

A

Stratospheric

B

Tropospheric

C

Naturally formed

D

None of these

Ozone JKPSI 2022 CBT
Correct Answer : B
Explanation :

Ground-level ozone (O3), also known as surface-level ozone and tropospheric ozone, is a trace gas in the troposphere (the lowest level of the Earth`s atmosphere), with an average concentration of 20–30 parts per billion by volume (ppbv), with close to 100 ppbv in polluted areas.

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