Physics
Sound travels with a different speed in media. In what order does the velocity of sound increase in these media?

Water, iron and air
Air, water and iron
Iron, water and air
Iron, air and water

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Physics
Radiocarbon is produced in the atmosphere as a result of

Collision between fast neutrons and nitrogen nuclei present in the atmosphere.
Lightning discharge in atmosphere.
Action of solar radiations particularly cosmic rays on carbon dioxide present in the atmosphere.
Action of ultraviolet light from the sun on atmospheric oxygen.

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Physics
A capillary tube is partially dipped vertically in a vessel containing water. Due to capillarity water rises in the tube. The height of water rise in the tube can be increased by

Decreasing the radius of the capillary tube
Increasing the height of water in the vessel
None of these
Increasing the radius of the capillary tube

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