Global Warming and Change in Atmospheric Chemistry

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1. No impact on the equilibrium level of ozone in the stratosphere
2. Equilibrium level of ozone in the stratosphere is disturbed
3. Increase in the level of ozone in the stratosphere
4. Decrease in the level of oxygen in the stratosphere

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1. It had no impact on the ozone layer
2. It could destroy the ozone layer to a considerable extent
3. It could cause the level of ozone to increase
4. It could lead to an increase in the level of nitrogen oxides in the atmosphere

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1. Chlorine has no impact on ozone depletion
2. Ozone concentration in the stratosphere might be rising
3. Chlorine causes a depletion of oxygen in the stratosphere
4. Chlorine causes an increase in the level of ozone in the stratosphere

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1. They are all toxic at ground level
2. They all contribute to the greenhouse effect
3. They are all sources of the depletion of stratospheric ozone
4. They all cause acid rain

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1. To transport water to the site of fire
2. To put out fire using chemicals
3. To provide oxygen to fire fighters
4. To create a barrier between fire and surroundings

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1. 5% per year
2. 10% per year
3. 15% per year
4. 20% per year

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1. 1973 and 1974
2. 1974 and 1975
3. 1975 and 1976
4. 1976 and 1977

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1. More than 500,000 tonnes
2. Less than 500,000 tonnes
3. Exactly 500,000 tonnes
4. None of the above

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1. 1974
2. 1985
3. 1987
4. None of the above

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1. 10
2. 20
3. 24
4. 30

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1. 100,000 tonnes
2. 500,000 tonnes
3. 1,000,000 tonnes
4. 10,000,000 tonnes

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1. 5 to 10 percent
2. 10 to 15 percent
3. 13 to 28 percent
4. 28 to 35 percent

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1. (i) Anthropogenic process (ii) Chlorine process
2. (i) Natural process (ii) Chlorine process
3. (i) Natural process (ii) Oxygen process
4. (i) Oxygen process (ii) Anthropogenic process

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1. It is converted to oxygen
2. It is converted to single oxygen molecules
3. It is converted to nitrous oxides
4. None of the above

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1. It is split into nitrogen and single oxygen molecules
2. It is split into oxygen and single nitrogen molecules
3. It is split into oxygen and single oxygen molecules
4. It remains unchanged

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1. Redistribution of ozone by atmospheric circulation
2. Conversion of atmospheric nitrogen into nitrous oxides
3. Release of chlorine and halon gases
4. None of the above

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1. Ozone depletion is caused by the release of nitrogen oxides from supersonic jets.
2. Ozone depletion is a localized phenomenon.
3. Chlorine hypothesis suggests that the depletion of ozone is due to the release of chlorine molecules from the breakdown of chlorofluorocarbon.
4. The concentration of sulphate aerosols is highest over the southern hemisphere.

Correct Answer

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1. It is the theory that the release of nitrogen oxides from supersonic jets causes ozone depletion.
2. It is the belief that the chemistry of cloud surface is of paramount significance in the destruction of ozone.
3. It is the idea that polar stratospheric clouds are responsible for the depletion of ozone.
4. It is the theory that sulphate aerosols emitted through volcanic eruptions and industrial activities catalyse the transformation of ozone to ordinary oxygen.

Correct Answer

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1. Nitrogen oxides are emitted from the exhausts of large fleet of commercial airplanes.
2. The first commercial flights of supersonic transport aircrafts started in 1986.
3. The impact of nitrogen oxides on stratospheric ozone was first studied by Harold H. Johnston.
4. The Climatic Impact Assessment Programme was launched by the US Department of Transportation to study the impact of sulphate aerosols on ozone depletion.

Correct Answer

Options:

1. It is the theory that the release of nitrogen oxides from supersonic jets causes ozone depletion.
2. It is the belief that the chemistry of cloud surface is of paramount significance in the destruction of ozone.
3. It is the idea that sulphate aerosols catalyse the transformation of ozone to ordinary oxygen.
4. It is the theory that depletion of ozone over the Arctic region is caused by the formation of polar stratospheric clouds.

Correct Answer