Physics
Which of the following represents a relation for ''heat lost = heat gained'?

Principle of colors
Principle of thermal equilibrium
Principle of vaporization
Principle of calorimetry

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Physics
A tank filled partially with a liquid is subjected to a uniform horizontal acceleration. Which of the following is true for the surface of liquid in the tank?

The liquid surface falls down on the direction of motion and rises up on the back side of the tank
The liquid surface falls down only at the center of the tank
None
The surface of the liquid remains horizontal

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Physics
A dynamo is used to convert

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

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