Physics
In very cold countries alcohol is used as a thermometric liquid because

Alcohol is a poor conductor of heat
It will not stick to the glass tube
Alcohol can be coloured for its level to be seen easily
Its freezing point is very low

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Physics
Negative feedback in amplifiers

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

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