# Physics Chapter - 3 Test Class-11

## Physics Chapter - 3 Test Class-11 ## Physics Chapter - 3 Test Class-11

MULTIPLE CHOICE QUESTIONS: (10)

1. The magnitude of velocity is called.
1. average velocity
2. acceleration
3. speed
4. displacement
2. The force which produces an acceleration of 1ms-2 in a body of mass 1kg is equals to:
1. One Slug
2. One Pound
3. One Dyne
4. One Newton
3. A 5kg mass is falling freely, force acting on it:
1. 5N
2. 9.8N
3. 19.6N
4. Zero
4. Acceleration of 1.5ms-2 expressed in km hr-2 is:
1. 324
2. 5.4
3. 5400
4. 19440
5. One dyne is equals to:
1. 103N
2. 105N
3. 10-5N
4. 10-3N
6. The ballistic missiles are used only for:
1. Long ranges
2. short ranges
3. medium ranges
4. none of these
7. Kgms-1 can also be written as:
1. Nm
2. Ns
3. Js
4. Ns-1
8. As a rocket moves upward doing its job, its acceleration goes on:
1. Increasing
2. decreasing
3. remains constant
4. becoming zero
9. If the initial velocity of a projectile becomes doubled, the time of flight will.
1. Double
2. same
3. 3 times
4. 4 times
10. A force of 10N is applied on a body of mass 1kg for 5 seconds, to a distance of 10m. The rate of change of momentum is:
1. 50N
2. 25N
3. 20N
4. 10N

ATTEMPT ALL OF THE FOLLOWING SHORT QUESTIONS: (24)

1. Define Variable and Uniform Velocity.
2. Define Impulse and show that how it is related to Linear Momentum?
3. At what point or points does a projectile have its minimum speed, its maximum speed?
4. Motion with constant velocity is a special case of motion with constant acceleration. Discuss this statement.
5. Why it is useful to use a safety helmet?
6. Does a moving body have impulse?
7. Show that Force is equals to Rate of change of Linear momentum.
8. Under what conditions does average and instantaneous velocities of an object become equal?
9. How does a rocket move?
10. Calculate the distance covered by a free falling body during 1st second of its motion.
11. Write any two properties of Inertial frame of reference.
12. An athlete wants to generate a long jump, at what angle he should jump?