Physics
Total internal reflection can not take place when light goes from :

Water to glass
Glass to water
Glass to air
Water to air

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Physics
Which of the following is not a property of heavy water ?

Boiling point of heavy water is lower than that or ordinary water
Density of heavy water is higher than that of ordinary water
It produces corrosion
Freezing point of heavy water is higher than that of ordinary water

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Physics
Negative feedback in amplifiers

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

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