WBBSE For Class 9 Physical Science And Environment Chapter 2 Forces And Motion MCQS

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Chapter 2 Forces And Motion MCQs

Question 1. Definition of force is obtained from Newton’s

  1. First law of motion
  2. Second law of motion
  3. Law of Gravitation
  4.  Third law of motion

Answer: (1) First law of motion

Question 2. Measurment of force is obtained from Newton’s

  1. Law of gravitation
  2. 1st law of motion
  3. Third law of motion
  4. 2nd law of motion

Answer: (4) 2nd law of motion

Read And Learn More WBBSE Solutions For Class 9 Physical Science And Environment MCQS

Question 3. Momentum is the product of mass and

  1. Force
  2. Time
  3. Velocity
  4. Speed

Answer: (3) Velocity

WBBSE For Class 9 Physical Science And Environment Chapter 2 Forces And Motion MCQS

WBBSE Class 9 forces and motion MCQs with answers

Question 4. A ball rolling on floor stops because

  1. Floor exerts a frictional force
  2. Gravity
  3. Absence of unbalanced force
  4. None of these

Answer: (1) Floor exerts a frictional force

Question 5. A force 2F acts on a body creating acceleration a; the mass of the body is

  1. F/a
  2. 2F/a
  3. 2Fxa
  4. F/2a

Answer: (2) 2F/a

Question 6. A force acts on body at rest, distance moved by the body in time t is proportional to

  1. \(t^2\)
  2. t
  3.  \(t^{-1}\)
  4.  \(t^3\)

Answer: (1) \(t^2\)

Question 7. If a body is in acceleration then

  1. Its speed always increases
  2. Its velocity always increases
  3. Its velocity always decreases
  4.  A force acts on it

Answer: (2) Its velocity always increases

Forces and motion multiple choice questions for WBBSE Class 9

Question 8. Due to action of an unbalanced force on a body, the acceleration of the body is proportional to

  1. The force acting on the body
  2. Velocity of the body
  3. Mass of the body
  4. Speed of the body

Answer: (1) The force acting on the body

Question 9. Newton’s third law of motion may be applied to a body

  1. Only at rest
  2. Only in motion
  3.  Both at rest and in motion
  4.  None of these

Answer: (3) Both at rest and in motion

Question 10. Two bodies X and Y have masses of 20 kg and 90 kg respectively. Which of the two have more inertia?

  1. Body x
  2. Body Y
  3. Both have equal inertia
  4. None of these

Answer: (1) Body x

Question 11. Velocity of a particle moving with uniform acceleration

  1. Decreases
  2. Increases
  3. Remains unaltered
  4. None of these

Answer: (2) Increases

Important forces and motion questions for Class 9 Physical Science

Question 12. A man moving around a square field, each side of which is 50 m in length, returns to the starting point. His displacement is

  1. 200 m
  2. 50 m
  3.  0m
  4. 100 m

Answer: (3) 0m

Question 13. A particle moving in a circular path with uniform speed has an acceleration

  1. Away from the center
  2. Towards the center
  3. Along the tangent at any point on a surface
  4. None of these

Answer: (2) Towards the center

Question 14. If a body covers equal distances in equal time intervals, then it is

  1. At rest
  2. Moving with uniform speed
  3. Moving with uniform velocity
  4. Moving with uniform acceleration

Answer: (2) Moving with uniform speed

Question 15. If a body moves with a constant speed, the distance-time graph is

  1. A straight line
  2. A circle
  3. A line like a staircase
  4. A polygon

Answer: (1) A straight line

Question 16. The area under the speed-time graph is

  1. Circle
  2. Parabola
  3. Distance
  4. None of these

Answer: (3) Distance

WBBSE Class 9 Physical Science MCQs on Newton’s laws of motion

Question 17. The slope of a distance-time graph is

  1. Velocity
  2. Acceleration
  3. Displacement
  4. Speed

Answer: (4) Speed

Question 18. When a bus suddenly starts, the standing passengers lean backward in the. Bus, it is due to

  1. Newton’s first law
  2. Newton’s second law
  3. Newton’s third law
  4. None of these

Answer: (1) Newton’s first law

Question 19. The momentum of a body of given mass is proportional to its

  1. Volume
  2. Shape
  3. Speed
  4. Density

Answer: (3) Speed

Question 20. Which of the following has the largest inertia?

  1. A pin
  2. Your body
  3. An orange
  4. A brick

Answer: (2) Your body

Question 21. In absence of a force a body

  1. Can be at rest
  2. Moves with uniform speed
  3. Continues in its state of rest of motion
  4. (1) (2), (3), (4) all are correct

Answer:(4) (1) (2), (3), (4) all are correct

Solved MCQs on forces and motion for WBBSE Class 9

Question 22. Velocity is a

  1. Vector
  2. Scalar
  3. Both
  4. None

Answer: (1) Vector

Question 23. A body acted upon by a force must have

  1. Velocity
  2. Displacement
  3. Acceleration
  4. None of these

Answer: (3) Acceleration

Question 24. A body whose momentum is constant must have constant 

  1. Force
  2. Velocity
  3.  Acceleration
  4. All of these

Answer: (2) Velocity

Question 25. The motion of a rocket is based on the principle of conservation of

  1. Mass
  2. Kinetic energy
  3. Linear momentum
  4. Angular momentum

Answer: (3) Linear momentum

Question 26. A force of 250 N acts on a body and the momentum acquired by it is 125 kg m/s. What is the time for which the force acts on the body?

  1. 0.2’s
  2. 0.5s
  3. 0.4s
  4. 0.25 s

Answer: (2) 0.5 s

Laws of motion and inertia MCQs Class 9 WBBSE

Question 27. A scooter of mass 200 kg is moving with a uniform velocity of 18 km/h. The force required to stop the vehicle in 10 s is

  1.  720 N
  2.  360 N
  3. 180 N
  4. 216 N

Answer: (2) 360 N

Question 28. A body is moving with a constant speed in a straight line path. A force is not required to

  1. Increase its speed
  2. Change the direction
  3. Decrease the momentum
  4. Keep it moving with uniform velocity

Answer: (4) Keep it moving with uniform velocity

Question 29. A cricket player catches a ball of mass 0.1 kg moving with a speed of 10 m/s in 0.1 s. Force exerted by him is

  1. 10 N
  2. 5N
  3. 2N
  4. 1N

Answer: (1) 10 N

Best multiple choice questions on forces and motion for WBBSE Class 9

Question 30. What force will change the velocity of a body of mass 1 kg from 20 m/s to 30 m/ sin 2s?

  1. 25 N
  2. 5N
  3. 10 N
  4. 2N

Answer: (2) 5N

Question 31. The rocket engine lifts a rocket from the earth because hot gases with high

  1. Push it against the earth
  2. Push is against the air
  3. React against the rocket and push it up
  4. Heat the air which lifts the rocket

Answer: (3) React against the rocket and push it up

WBBSE Class 9 Physical Science friction and motion MCQs

Question 32. A man is at rest in the middle of a pond on perfectly smooth ice. He can get himself to the shore by making use of Newton’s

  1.  First law
  2. Second law
  3. Third law
  4. All the laws

Answer: (3) Third law

Question 33. A body of mass 2 kg is moving with a velocity of 8 m/s on.A smooth surface. If it is to be brought to rest in 4 s, then force to be applied is

  1.  8N
  2. 4N
  3. 2N
  4. 1N

Answer: (2) 4N

 

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