Physics
Which of the following celestial bodies contains abundant quantities of helium-3, a potential source of energy ?

Venus
Saturn
Moon
Earth

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Physics
Purpose of an optical filter is to

Dispense light into component colours
Transmit or absorb light of different colours
Refract light of different colours
Reflect lights of different colours

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Physics
Siphon will fail to work if:

Both its limbs are of unequal length.
The densities of the liquid in the two vessels are equal.
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.

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