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

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Question 1 of 12

Physics

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

Anti Parallel

Parallel

None of these

Perpendicular

Question 1 of 12

Question 2 of 12

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

1:1

1:4

4:1

1:2

Question 2 of 12

Question 3 of 12

3. An example of non-conservative force is:

Electric force

Magnetic force

Gravitational force

Frictional force

Question 3 of 12

Question 4 of 12

4. 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 twice its initial value

Become four times, its initial value

Remain constant

Question 4 of 12

Question 5 of 12

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

m₁mn

None of these

√m₁ √m₂

mnm₁

Question 5 of 12

Question 6 of 12

6. One horse power is given by:

746 Joules

746 Foot Pounds

746 KW

746 watts

Question 6 of 12

Question 7 of 12

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

Double

¼ times

4 times

Half

Question 7 of 12

Question 8 of 12

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

K.E

Electrical Energy

Solar Energy

Elastic P.E

Question 8 of 12

Question 9 of 12

9. The atmosphere is held to the earth by

Gravity

Clouds

Wings

The rotation of earth

Question 9 of 12

Question 10 of 12

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

5%

77%

44%

66%

Question 10 of 12

Question 11 of 12

11. 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

3.2 Joule

2.8 Joule

4.4 Joule

Question 11 of 12

Question 12 of 12

12. The expression for escape velocity is given by:

√2gR

ngR²

gR²/2

ngR

Question 12 of 12

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