Physics Force Chapter Important MCQ'S for 11 Science Entrance Exam | Science Entrance Exam Questions 

1. If 2N force is applied on 2 kg mass due east and same magnitude of force due west, the change in velocity of the body in 2 sec is

a. 0 m/sec2 b. 2m/sec2 c. 4m/sec2 d. 8m/sec2

2. Which type of inertia we do not have in straight-line motion?

a. inertia of rest b. inertia of direction c. inertia of color d. inertia of motion

3. If a body completes its motion in a circular track of radius 2m in 5 second, then the average velocity of the body is

a. 4π/5 m/sec b. 2π/5 m/sec c. 5π/4m/sec d. 0m/sec

4. A body exerts a force of magnitude 5N and gets 5N as reaction. Then the total force the body experiences

a. 10N b. 5N c.0N d. 25N

5. If a ball of mass m is dropped which hits the ground with the velocity v and it renounces vertically upward with the velocity v, then the change in momentum is

a. 0kgm/sec b. 2vkgm/sec c. 2mv kgm/sec d. 1kgm/sec

6. If the displacement of two points is x which is 2m, what is the possible longest distance between the points?

a. 2m b. infinity c. 2x d. none of above

7. Which one of the following is not a vector quantity?

a. momentum b. acceleration c. current d. force

8. A body is moving with a velocity 4m/sec and a force applied on it in opposite direction to the velocity which produces an acceleration of 1m/sec2 . The time taken by the body to make its velocity of same velocity as initial but in opposite direction is

a. 4 sec b. 8 sec c. 0 sec d. 1 sec

9. The value of 3N force in cgs system is

a. 3 dyne b. 300dyne c. 30000dyne d. 300000dyne

10. Inertia of rest depends on

a. mass of the body b. force applied on the body

c. velocity of the body d. direction of the motion

Answer :

1. a two equal and opposite forces are applied on the same mass, so net force is zero which produces no change in velocity.

2. c we have only three types of inertia in straight line motion. They are inertia of rest, motion and direction.

3. d when the body completes its motion in circular track, the total displacement is zero. So velocity is zero.

4. b the action and reaction are experienced by different objects. A body experiences the reaction force in return of the force applied by it to other object which is 5N here.

5. c the initial and final momentum of the body has magnitude mv but they have opposite direction. Since the momentum is a vector quantity, to find the difference between two oppositely directed vectors they should be added in magnitude. So it is 2mv.

6. b there are infinite possible lines which joins any two points of any length. So it is infinity.

7. c current has direction but it does not obey the law of vector addition. So it is a scalar quantity.

8. b same magnitude but opposite direction in velocity means the change in velocity is 8 m/sec and we have the acceleration = change in velocity / time Or, time = 8/1 =8 sec

9. d we have 1N=105 dyne. So, 3N = 3X105=300000dyne

10. a inertia of rest means to ability of the body to remain in rest. To bring it into motion, force has to be applied which depends on mass of the body. So inertia of rest depends on mass. 

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