Physics
A nuclear reactor is said to have become 'critical' when

It is ready to produce controlled energy
It starts emitting dangerous radioactive radiations
It stops due to malfunctioning
It is shut down to avoid explosion

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

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