FSc Part 1 Physics chapter 3: Motion and force MCQs with answers

By Team Megalecture · Updated 4 Nov 2026

30 exam-style questions on Motion and force, each with the answer and a short explanation. Ten of them are below to try. The chapter test draws ten fresh questions each time and is marked the moment you finish, with your score by topic.

30 questions · 3 topics · 10 per test

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What chapter 3 covers

Ten Motion and force questions with answers

Try each one, then open the answer. These ten stay the same; the test draws new ones every time.

1. The momentum of a body increases steadily from 20 kg m s−1 to 50 kg m s−1 in 5 s. The net force on it is

  1. A
    6 N
  2. B
    10 N
  3. C
    14 N
  4. D
    30 N
Show answer

Answer: A. F = Δp/Δt = (50 − 20)/5 = 6 N. 30 N is the change in momentum, not its rate of change.

2. During the flight of a projectile (no air resistance), the horizontal component of its velocity

  1. A
    remains constant
  2. B
    decreases to zero at the top
  3. C
    increases uniformly
  4. D
    first decreases then increases
Show answer

Answer: A. No horizontal force acts, so there is no horizontal acceleration. Only the vertical component changes, at 9.8 m s−2.

3. A rocket of mass 2000 kg in outer space ejects gas at 20 kg s−1 with a speed of 2000 m s−1 relative to the rocket. Its acceleration at that instant is

  1. A
    20 m s−2
  2. B
    10 m s−2
  3. C
    200 m s−2
  4. D
    40 m s−2
Show answer

Answer: A. Thrust = (mass per second) × v = 20 × 2000 = 40 000 N, so a = 40 000/2000 = 20 m s−2. 40 000 N is the force, not the acceleration.

4. A projectile is launched at 20 m s−1 at 30° above the horizontal. Its maximum height is

  1. A
    5.1 m
  2. B
    10.2 m
  3. C
    15.3 m
  4. D
    20.4 m
Show answer

Answer: A. H = u2sin2θ/2g = 400 × 0.25/19.6 = 5.1 m. Using cos2θ gives 15.3 m; forgetting the square on sin gives 10.2 m.

5. A car moving at 20 m s−1 slows uniformly to rest in 5 s. How far does it travel while stopping?

  1. A
    4 m
  2. B
    25 m
  3. C
    100 m
  4. D
    50 m
Show answer

Answer: D. Distance = area of the triangle under the v-t graph = ½ × 20 × 5 = 50 m. 100 m forgets the ½; 4 m is the deceleration in m s−2.

6. An athlete completes exactly one lap of a 400 m circular track in 50 s. What is the average velocity for the lap?

  1. A
    8 m s−1
  2. B
    zero
  3. C
    4 m s−1
  4. D
    16 m s−1
Show answer

Answer: B. She ends where she started, so displacement is zero and average velocity is zero. 8 m s−1 is the average speed (distance ÷ time).

7. A ball is thrown vertically upwards at 19.6 m s−1. How long is it before it returns to the thrower's hand?

  1. A
    1 s
  2. B
    2 s
  3. C
    8 s
  4. D
    4 s
Show answer

Answer: D. Time to the top = u/g = 19.6/9.8 = 2 s, and the fall back takes another 2 s, so 4 s in total. 2 s is only the time to the highest point.

8. On a displacement-time graph, a straight line sloping upwards shows a body moving with

  1. A
    constant velocity
  2. B
    uniform acceleration
  3. C
    increasing velocity
  4. D
    zero velocity
Show answer

Answer: A. The gradient of a displacement-time graph is velocity; a straight line has constant gradient, so the velocity is constant.

9. A ball is projected at 49 m s−1 at 30° above the horizontal. Its time of flight on level ground is

  1. A
    2.5 s
  2. B
    8.7 s
  3. C
    5.0 s
  4. D
    10 s
Show answer

Answer: C. T = 2u sin θ/g = 2 × 49 × 0.5/9.8 = 5.0 s. Using cos 30° gives 8.7 s; 2.5 s is only the time to the top.

10. A stone is dropped from rest from a high bridge. How far does it fall in the first 3.0 s? (Ignore air resistance.)

  1. A
    29.4 m
  2. B
    44.1 m
  3. C
    88.2 m
  4. D
    14.7 m
Show answer

Answer: B. s = ½gt2 = ½ × 9.8 × 9 = 44.1 m. 29.4 m is the speed after 3 s in m s−1, not a distance.

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Ways to practise this chapter

Motion and force: questions students ask

How many Motion and force MCQs are there?

30, each with the answer and a short explanation, across 3 topics: Displacement, velocity, acceleration and motion graphs, Newton's laws, momentum and collisions, Projectile motion. Every chapter test draws ten of them, so you can take it many times.

Is the FSc Part 1 Physics chapter 3 test free?

Yes. The test, the answers and the explanations are free and need no sign-up. Sign in only if you want your scores kept across devices.

How is the chapter test marked?

The moment you press Finish: your score, the right answer and an explanation for every question, and the ones you got wrong saved in My mistakes to retry.

Can I read the explanations in Urdu?

Yes. In practice mode and on your results you can switch the explanations to Urdu.

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