Conservation of Linear Momentum, Class 9 Science

1. There will be total 10 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 10

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 10

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 10

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 10

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 10

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

 Its colour

 Its velocity

 Its volume

  Its shape

Question 6 of 10

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 10

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 10

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 10

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 10

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