The Ozone Layer

Q.

What is meant by ozone hole?

Q. The zone of atmosphere in which the ozone layer is present is called

1. Ionosphere
   
2. Mesosphere
3. Stratosphere
4. Troposphere

Q. Assertion : UV radiation causes photodissociation of ozone into $O_2$ and O. Thus causing damage to the stratospheric ozone layer.

Reason : Ozone hole is resulting in global warming and climate change.

1. If both assertion and reason are true and reason is correct explanation of assertion.
2. If both assertion and reason are true but reason is not the correct explanation of assertion.
3. If assertion is true but reason is false.
4. If both assertion and reason are false.

Q. Which one of the following is a wrong statement?

1. Most of the forest have been lost in tropical areas.
2. Greenhouse effect is a natural phenomenon.
3. Eutrophication is natural phenomenon in fresh water bodies.
4. Ozone is upper layer of atmosphere is harmful to animals.

Q. Assertion (A) : Ozone depletion leads to global warming.
Reason (R) : UV rays cause destruction of the ozone layer.

1. A & R are correct and R explains A
2. A & R are correct but R doesnt explain A
3. A & R are incorrect
4. A is correct but R is incorrect

Q. DU is unit for the measurement of

1. volume of ozone
2. thickness of ozone
3. thickness of any gas
4. volume of ozone hole

Q. The thickness of the ozone in a column of air from the ground to the top of the atmosphere is measured in terms of ___ units.

Q.

Ozone-hole means

1. A large sized hole in the ozone layer

2. Thinning of the ozone layer

3. Small holes scattered in the ozone layer

4. Thickening of ozone in the ozone layer

Q.

What is Ozone depletion? Give two reasons for it.

Q. The thickness of the ozone layer is measured in terms of

1. Brazil
2. Sweden
3. South Africa
4. Argentina

Q.

What consequences will follow the destruction of the ozone layer?

Q. The ozone layer is ___ km thick.

1. 0.5
2. 5
3. 15
4. 20

Q.

Whatever CFCs are added to the stratosphere, they have permanent and continuing effects on ozone levels. Comment upon the statement.

Q.

Ozone is separated from oxygen by = _______.

Q. The zone of atmosphere in which the ozone layer is present is called

1. Ionosphere
   
2. Mesosphere
3. Stratosphere
4. Troposphere

Q. Ozone layer thickness is measured in units.

1. Doppler
2. Dalton
3. Dobson
4. Decibel

Q. Ozone layer thickness is measured in units.

1. Doppler
2. Dalton
3. Dobson
4. Decibel

Q.

____________ cause depletion in ozone layer.

Q. The zone of atmosphere in which the ozone layer is present is called

1. Ionosphere
   
2. Mesosphere
3. Stratosphere
4. Troposphere

Q. Ozone is considered as secondary pollutant because

1. It is formed by the oxidation of $O_2$ of the atmosphere
2. It is formed by the transformation of $N{O}_x$ in sunlight
3. It is not primarily important
4. It develops secondary effects on living organisms

Q. Assertion (A) : Ozone depletion leads to global warming.
Reason (R) : UV rays cause destruction of the ozone layer.

1. A & R are correct and R explains A
2. A & R are correct but R doesnt explain A
3. A & R are incorrect
4. A is correct but R is incorrect

Q. How does the atmosphere act as a protective blanket? Mention the harmful affects of ultraviolet rays?

Q. Excessive exposure of humans to UV-rays results in
(i) Damage to immune system
(ii) Damage to lungs
(iii) Skin cancer
(iv) Peptic ulcers

1. (i) and (ii)
2. (ii) and (iv)
3. (i) and (iii)
4. (iii) and (iv)

Q.

UV radiation from sunlight causes the reaction that produces ___.

1. N₂O

2. O₃

3. SO₂

4. CFCs

Q.

What is ‘ozone hole’?

Q.

The ozone layer absorbs[Kerala PET 2002]

Q.

If you were in charge of the United Nations Environment Program, what measures would you take to reduce ozone layer depletion? [2 marks]

Q. The ozone layer lies in the

1. Thermosphere
2. Troposphere
3. Mesosphere
4. Stratosphere

Q.

Earth is protected from ultraviolet radiations by means of

1. Ozone layer

2. Nitrogen

3. Oxygen

4. Carbon dioxide

Q.

What would happen if the ozone layer in the atmosphere disappears?