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

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Question 1 of 12

Physics

1. 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

4:1

1:4

1:2

Question 1 of 12

Question 2 of 12

2. The expression for escape velocity is given by:

gR²/2

√2gR

ngR²

ngR

Question 2 of 12

Question 3 of 12

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

√m₁ √m₂

None of these

m₁mn

mnm₁

Question 3 of 12

Question 4 of 12

4. 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

3.2 Joule

2.8 Joule

3.8 Joule

4.4 Joule

Question 4 of 12

Question 5 of 12

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

Electrical Energy

Elastic P.E

K.E

Solar Energy

Question 5 of 12

Question 6 of 12

6. One horse power is given by:

746 Joules

746 KW

746 Foot Pounds

746 watts

Question 6 of 12

Question 7 of 12

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

Perpendicular

Anti Parallel

None of these

Parallel

Question 7 of 12

Question 8 of 12

8. An example of non-conservative force is:

Magnetic force

Electric force

Gravitational force

Frictional force

Question 8 of 12

Question 9 of 12

9. The atmosphere is held to the earth by

The rotation of earth

Gravity

Clouds

Wings

Question 9 of 12

Question 10 of 12

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

44%

66%

77%

5%

Question 10 of 12

Question 11 of 12

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

¼ times

Double

Half

4 times

Question 11 of 12

Question 12 of 12

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

Become four times, its initial value

Become three times, its initial value

Remain constant

Become twice its initial value

Question 12 of 12

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