The main culprit of greenhouse effect is Carbon dioxide. But which is the second element contributing most to greenhouse effect

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Laughing gas has chemical composition of following two elements ?

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A. Exosphere B. Ionosphere C. Troposphere D. Stratosphere E. Ozone layer...

A body can escape the gravitational pull of the earth if it is thrown up with a velocity of?

A. 25 miles per sec b ) 60 miles per sec C. 7 miles per sec D. 10 miles per sec E. None of these...

Short-sightedness can be corrected by using ___________?

A. Convex lens B. Concave lens C. Convex-concave lens D. Concave-convex lens...

Materials for rain-proof coats and tents owe their water proof properties to________?

A. Surface tension B. Viscosity C. Specific gravity D. Elasticity...