Physics Chapter 4 Work and Energy Mcqs Test Online Class 11th Punjab

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Question 1 of 12

Physics

1. An example of non-conservative force is:

Gravitational force

Frictional force

Electric force

Magnetic force

Question 1 of 12

Question 2 of 12

2. A body of mass 5kg is moving with a momentum of 10kg ms⁻¹. A force of 0.2 N acts on it in the direction of motion of the body for 10 seconds. The increase in its kinetic energy is

3.8 Joule

2.8 Joule

4.4 Joule

3.2 Joule

Question 2 of 12

Question 3 of 12

3. If the K.E of a body become four time of the initial value, then new momentum will

Become three times, its initial value

Become four times, its initial value

Remain constant

Become twice its initial value

Question 3 of 12

Question 4 of 12

4. One horse power is given by:

746 KW

746 watts

746 Joules

746 Foot Pounds

Question 4 of 12

Question 5 of 12

5. Work is said to be negative when F and d are:

Parallel

Perpendicular

None of these

Anti Parallel

Question 5 of 12

Question 6 of 12

6. The energy stored in the spring of watch is:

K.E

Elastic P.E

Solar Energy

Electrical Energy

Question 6 of 12

Question 7 of 12

7. Two bodies with kinetic energies in the ration of 4:1 are moving with equal linear momentum. The ratio of their masses is

1:4

4:1

1:1

1:2

Question 7 of 12

Question 8 of 12

8. The atmosphere is held to the earth by

Clouds

The rotation of earth

Wings

Gravity

Question 8 of 12

Question 9 of 12

9. Two bodies of masses m₁ and mn have equal momentum their kinetic energies E₁ and En are in the ratio:

mnm₁

m₁mn

None of these

√m₁ √m₂

Question 9 of 12

Question 10 of 12

10. If force and displacement of particle in the direction of force are doubled. Work would be

Double

Half

4 times

¼ times

Question 10 of 12

Question 11 of 12

11. The expression for escape velocity is given by:

ngR²

ngR

√2gR

gR²/2

Question 11 of 12

Question 12 of 12

12. If momentum is increased by 20% then K.E. increases by

44%

5%

77%

66%

Question 12 of 12

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