Environmental Issues Test

Result

Environmental Issues Test - 3

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Weekly Quiz Competition

Question 1
4 / -1

Which of the following statements regarding ozone is incorrect?

A
'Good ozone' is formed in the lower atmosphere (troposphere) that absorbs harmful UV rays coming from Sun, 'bad ozone' is present in the upper part of atmosphere (stratosphere) that harms plants and animals.

B
The thickness of the ozone in a column of air from the ground to the top of the atmosphere is measured in terms of Dobson units (DU).

C
Recognising the deleterious effects of ozone depletion, an international treaty, known as the Montreal Protocol, was signed at Montreal (canada) in 1987 (became effective in 1989) to control the emission of ozone depleting substances.

D
None of these.

Solution

'Good ozone' is found in the upper part of the atmosphere called the stratosphere and it act as a shield absorbing ultraviolet radiations from the sun. UV rays are, highly injurious to living organisms. 'Bad ozone' is formed in the lower part of atmosphere called troposphere and it harms plants and animals.
Question 2
4 / -1

The major ozone depleting substance out of the following is _____________.

A
CFCs

B
O₂

C
Nitrogen

D
All of these

Solution

Ozone-depleting substances (ODS) are substances that react with ozone present in the stratosphere and destroy the same. The major Ozone-depleting substances are chlorofluorocarbons (14% of total depletion), nitrogen oxides (3.5% depletion), sulphur dioxide, halon, carbon tetrachloride, methyl chloroform, chlorine, etc.
Question 3
4 / -1

Montreal protocol is associated with ______________________.

A
Control of emission of ozone depleting substances

B
Control of radioactive wastes

C
Control of desertification

D
Protection and management of forests

Solution

Recognising the deleterious affects of ozone depletion, an international treaty, known as the Montreal Protocol, was signed at Montreal (canada) in 1987 (effective in 1989) to control the emission of ozone depleting substances.
Question 4
4 / -1

Ozone depletion is occurring widely in

A
troposphere

B
stratosphere

C
ionosphere

D
all of these

Solution

Ozone gas is continuously formed by the action of UV rays on molecular oxygen, and also degraded into molecular oxygen in the stratosphere. There should be a balance between production and degradation of ozone in the stratosphere.
Question 5
4 / -1

Which of the following can cause DNA damage and mutations in humans?

A
Absorption of UV-A and UV-B

B
Absorption of UV-B

C
Absorption of UV-A

D
Absorption of UV-A and UV-C

Solution

Ultraviolet radiations are of three types - UV-C (100 - 280 nm). UV-B (280 - 320nm) and UV-A (320 - 390nm). UV radiation of wavelengths shorter than UV-B, are almost completely absorbed by Earth's atmosphere, given that the ozone layer is intact. But, UV-B damages DNA and mutation may occur. It causes aging of skin, damage to skin cells and various types of skin cancers.