MCQ Conservation of Linear Momentum Chapter 9 Class 9 Science

MCQ’s For All Chapters – Science Class 9th

1. There will be total 14 MCQ in this test.
2. Please keep a pen and paper ready for rough work but keep your books away.
3. The test will consist of only objective type multiple choice questions requiring students to mouse-click their correct choice of the options against the related question number.
4. No negative marking for incorrect choice.
5. Please click on “Finish the Test” when you want to exit.
6. All the best – Happy Studying

1. Rockets work on the principle of conservation of:

Mass

Momentum

Energy

Impulse

Question 1 of 14

2. The law of conservation of momentum holds for:

Individual particles

Only for two particles

A system of particles

Only for three particles

Question 2 of 14

3. A gun of mass 5 kg fires a 50g bullet with a velocity of 200m/s. the recoil velocity of the gun is:

2 m/s

20 m/s

Zero

0.2m/s

Question 3 of 14

4. When a force is applied to a body of mass 2 kg, its velocity changes from 20 ms-1 to 30 ms-1 in 2 s. The rate of change of momentum of the body is:

10 Kg ms^-1

10 N

0.1 N

10 Kg m

Question 4 of 14

5. The law of conservation of momentum states that the sum of momenta of two objects before collision is equal to the sum of momenta after the collision provided that ______

No internal unbalanced force acts on them.

No external unbalanced force acts on them.

No external balanced force acts on them.

No internal balanced force acts on them.

Question 5 of 14

6. The momentum of a body of given mass is proportional to:

Its colour

Its velocity

Its volume

Its shape

Question 6 of 14

7. A ball of mass 5 kg moving at 3 m/s collides with another ball of mass 3 kg moving at 5 m/s in the same direction. If the balls move together after the collision in the same direction, find their common velocity.

5 m/s

3.75 m/s

6.25 m/s

7.5 m/s

Question 7 of 14

8. Two objects each of mass 1.5 Kg are moving in the same straight line but in opposite directions. The velocity of each object is 2.5m/s before the collision during which they stick together. What will be the velocity of the combined object after the collision?

2.5m/s

2.5m/s

5m/s²

Zero

Question 8 of 14

9. A machine gun of mass 24 kg fires 20g bullets at the rate of 8 bullets per second, with a speed of 250 m/s. The force required to hold the gun in position is:

10 N

30 N

40 N

20 N

Question 9 of 14

10. The momentum of an isolated system remains conserved provided:

Net final momentum of the system is zero.

Net external force of the system is non zero.

Net initial momentum of the system is zero.

Net external force on the system is zero.

Question 10 of 14

11. Assertion-Zero unbalanced force is only achieved in vacuum chamber.

Reason-Practically there is difficulty seen for achieving zero balanced force.

a) Both Assertion and Reason are correct, and reason is the correct explanation for assertion.

b) Both Assertion and Reason are correct, and Reason is not the correct explanation for Assertion.

c) Assertion is true but Reason is false.

d) Reason is true but Assertion is false.

Question 11 of 14

12. Assertion-Zero balanced force is only achieved in vacuum chamber.

Reason-Practically there is difficulty seen for achieving zero balanced force.

a) Both Assertion and Reason are correct, and reason is the correct explanation for assertion.

b) Both Assertion and Reason are correct, and Reason is not the correct explanation for Assertion.

c) Assertion is true but Reason is false.

d) Reason is true but Assertion is false.

Question 12 of 14

13. Assertion- Safety belts are protecting us from accidents.

Reason- safety belts should wear on head.

a) Both Assertion and Reason are correct, and reason is the correct explanation for assertion.

b) Both Assertion and Reason are correct, and Reason is not the correct explanation for Assertion.

c) Assertion is true but Reason is false.

d) Both Assertion and Reason are false.

Question 13 of 14

14. Assertion- Safety belts are protecting us from accidents.

Reason- safety belts should wear around our waist.

a) Both Assertion and Reason are correct, and reason is the correct explanation for assertion.

b) Both Assertion and Reason are correct, and Reason is not the correct explanation for Assertion.

c) Assertion is true but Reason is false.

d) Both Assertion and Reason are false.

Question 14 of 14

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