Physics
Intensity of sound has

an object existence
both subjective and objective existence
a subject existence
no existence

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Physics
A dynamo is used to convert

Electrical energy into magnetic energy
Electrical energy into mechanical energy
Magnetic energy into mechanical energy
Mechanical energy into electrical energy

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Physics
A man standing at the top of a tower has two spheres A and B. He drops sphere A downwards and throws sphere B horizontally at the same time. Which of the following is correct ?

A will reach the ground first.
B will reach the ground first.
Both the spheres will reach the ground simultaneously.
The question is incomplete because the masses of the spheres are not given.

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Physics
A transformer

Converts electrical energy into mechanical energy
Converts DC to AC
Converts AC voltage to D.C. voltage
Is used to decrease or increase AC voltage

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