Physics - Study Mode

[#556] A dynamo is a device which
Correct Answer

(C) Converts mechanical energy into electrical energy

Explanation

Solution: Dynamo is a device that converts mechanical energy into electrical energy. Its other name is electric generator. A device which has a reversed effect to this is the electric motor. An electric motor is a device which converts electric energy to mechanical energy.

[#557] A dynamo is used to convert
Correct Answer

(A) Mechanical energy into electrical energy

Explanation

Solution: A dynamo is used to convert mechanical energy into electrical energy.

[#558] A photo-electric cell converts
Correct Answer

(D) Light energy to electrical energy

Explanation

Solution: A photo-electric cell converts light energy to electrical energy.

[#559] Dynamo is a device for converting
Correct Answer

(B) Mechanical energy into electrical energy

Explanation

Solution: Dynamo is a device for converting mechanical energy into electrical energy.

[#560] For a freely falling body, the sum of kinetic energy and potential energy is always
Correct Answer

(C) Same

Explanation

Solution: The sum total of the potential energy and the kinetic energy of the object during its free fall remains the same, i.e., the total mechanical energy (potential energy + kinetic energy) remains constant. Thus, the law of conservation of energy is not violated.