Physics
Refrigeration is a process which

Plasmolyses the bacteria
Inactivates the bacteria
Slows down the bacterial growth
Kills bacteria

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Physics
RADAR is used for:

locating geostationary satellites.
detecting and locating the position of objects such as Aeroplanes.
locating submerged submarines.
receiving a signals in a radio receiver.

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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

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

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Physics
Planets do not twinkle because

They are very far away from the earth resulting in decrease in intensity of light
They emit light of a constant intensity
Their distance from the earth does not change with time
They are nearer to earth and hence we receive a greater amount of light.

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