Work, Energy and Power Test

Result

Work, Energy and Power Test - 1

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Weekly Quiz Competition

Question 1
1 / -0

A body of a mass 10 kg falls from a building 400 m height. What is the difference between the energy possessed by the body at any instance and initial energy?

A
4 × 10³ J

B
0 J

C
4 J

D
None of these

Solution

Using conservation of energy , total mechanical energy of the system will remain conserved
So ,energy at any instant is always equal to the initial energy
Question 2
1 / -0

Power cannot be measure in

A
kilowatt hour

B
Joule/sec

C
horse power

D
Watt

Solution

kilowatt hour is not the unit of power all others are unit of power.
Question 3
1 / -0

At which point(s) potential energy of the simple pendulum is maximum?

A
at the equilibrium

B
at turning points of oscillation

C
at remain same always

D
cannot be determined

Solution

Potential energy of the simple pendulum is maximum at turning points of oscillation - as height is maximum at these points. Since potential energy = mgh, therefore potential energy of simple pendulum is maximum at turning points.
Question 4
1 / -0

What type of energy conversion takes place in electric cell?

A
Chemical to Mechanical

B
Electric to Chemical

C
Chemical to Electrical

D
Electrical to Mechanical

Solution

From an electric cell, when current is drawn. The chemical energy stored in it changes to electrical energy.
Question 5
1 / -0

What kind of energy conversion takes place in photoelectric cell?

A
Electrical to light energy

B
Light to electrical energy

C
Electrical to Mechanical energy

D
Light to Mechanical energy

Solution

In photoelectric cell, light energy gets converted into electrical energy.