A considerable part of the harmful ultraviolet radiation of the sum does not reach the earth surface, because of the fact that, there is a layer of _____________ high above earth’s atmosphere, which absorbs it?

Related Mcqs:

CFC (chloro fluoro carbon) is very highly reactive in causing depletion of ozone layer in the atmosphere. Each atom of chlorine liberated from CFC is capable of decomposing ________________ molecules of ozone?

A. 102 B. 105 C. 109 D. 1015...

Lung cancer & DNA breakage are the major ill effects of excessive ozone exposure to human beings. Ozone layer depletion in the atmosphere is mainly caused by the presence of________________?

A. CO2 B. SO2 C. Hydrocarbons D. CFC (chloro fluoro carbon)...

White smoke coming out of the chimney of a furnace indicates the use of_________________?

A. Low excess air B. Very high excess air C. Gaseous fuel in the furnace D. Liquid fuel in the furnace...

Presence of iron and manganese in water causes___________________?

A. Reduction in its dissolved oxygen content B. Discoloration of bathroom fixtures C. Temporary hardness D. None of these...

TLV of ozone (O3) and phosgene (COCl2) in air is _______________ ppm?

A. 0.1 B. 25 C. 100 D. 1000...