Q. How many treaties were signed to ban CFCs?

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Q. A single molecule of 'feron' gas can destroy a thousands of

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Q. When was 'Montreal protocol' signed by 24 nations?

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Q. Antarctic ozone layer is known as

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Q. Which chemical is used in air conditions and refrigerators ?

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Q. What does ultraviolet radiation cause ?

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Q. Over heavily polluted areas of America and Europe, ozone level has fallen about

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Q. What gases are involved in ozone depletion ?

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Q. Nonisothermal vortex shedding based on:

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Q. Nitric oxide gas reacts with ozone molecule to form

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Q. Earth is encircled in a layer of air, known as

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Q. Without ozone layer all terrestrial animals will be

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Q. Freon 12 belongs to group known as

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Q. Exposure to ultraviolet rays can cause:

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Q. 'ozone' layer from high flying jet is much lower than

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Q. Which chemical was used for cleaming equipements?

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Q. What does a single chlorine free radical destroy ?

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Q. Land and water dwelling plants, may suffer from

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Q. What is involved in ozone depletion ?

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Q. Greatest decline, being observed over America and Argentina, ranges from 5% to

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