Physics
The ''Greenhouse effect' is mainly due to increase in atmospheric

Nitrogen
Carbon dioxide
Sulphur dioxide
Ozone

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Physics
Negative feedback in amplifiers

Increases bandwidth and decreases noise
Decreases bandwidth and increases noise
Increases bandwidth and increases noise
Decreases bandwidth and decreases noise

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Physics
Siphon will fail to work if:

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

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