Physics
Which one among the following doesn't have any effect on velocity of sound ?

Humidity
Temperature
Density
Pressure

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Physics
Dynamo is a device for converting

Chemical energy into electrical energy
Mechanical energy into electrical energy
Magnetic energy into electrical energy
Heat energy into electrical energy

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Physics
Water pipes in hilly areas often burst on a cold frosty night, because

The material of which pipes are made contracts due to cold and so breaks
None of these
Water in the pipes freezes and on freezing water expands, so pipes break
Frost makes the pipes rusty, so they break

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