Physics
Siphon will fail to work if:

Both its limbs are of unequal length.
The temperature of the liquids in the two vessels are the same.
The level of the liquid in the two vessels are at the same height.
The densities of the liquid in the two vessels are equal.

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Physics
X-rays region lies between

Visible and infra-red region
Ultraviolet and visible region
Short radio waves and long radio waves
Gamma-rays and ultraviolet region

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Physics
When a pail of water is swung in a vertical circle, the water does not fall out at the top of the loop when the speed is

Above a certain minimum value irrespective of amount of water in the pail
Above a certain minimum value depending on amount of water in the pail
Below a certain minimum value depending on amount of water in the pail
Below a certain minimum value irrespective of amount of water in the pail

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Physics
In a railway track, two rails are joined end to end with a gap in between them because

Accidents due to contraction in winter can be avoided
Accidents due to expansion in summer can be avoided
Air-gaps are necessary for bearing the weight of running train
Steel can be saved

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