Physics
The potential difference between the terminals of an electric heater is 60 V when it draws a current of 4 A from the source. What current will the heater draw if the potential difference is increased to 127.5 V ?

24 A
8.5 A
0.41666666666667

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Physics
The velocity of sound in air

Decreases with decrease of temperature
Increases with decrease of temperature
Decreases with increase of temperature
Does not depend on temperature

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Physics
Why are we able to hear short wave broadcasts better than long wave broadcasts ?

By convention, short waves are meant for long distances, whereas long waves are reserved for short distances.
Short wave broadcasts are made by nearby radio stations.
Short waves are more energetic than long waves.
Short waves are unaffected by atmospheric disturbances.

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