| Subject | Science |
| Chapter 7 | Motion |
| Type | Multiple choice questions (MCQ’s) |
Class 9 Science MCQ Motion
1. The ratio of displacement to distance is
(A) Always < 1
(B) Always = 1
(C) Always 1
(D) Maybe 1
Correct Answer: D
2. Consider the motion of the tip of the minute hand of a clock. In one hour
(A) The average velocity is zero
(D) The displacement is non-zero
(B) The distance covered is zero
(C) The average speed is zero
Correct Answer: A
3. Which of the following statements is not true?
(A) If displacement covered by a particle is zero, then distance covered may or may not be zero
(B) If the distance covered is zero then the displacement must be zero
(C) The numerical value of the ratio of velocity to speed is always less than one
(D) The numerical value of ratio of displacement to distance is equal to or less than one
Correct Answer: C
4. A boy completes one round of a circular track of radius 20 m in 50 seconds. The displacement at the end of 4 minute 10 second will be
(A) 40 m
(B) 20 m
(C) 80 m
(D) Zero
Correct Answer: D
5. A car moves from O to D along the path OABCD shown in figure. What is distance travelled and net displacement?
(A) 16, 5
(B) 17, 5
(C) 20, 4
(D) 15, 3
Correct Answer: B
6. A person moves on a semicircular track of radius 40 m. If he starts at one end of the track and reaches the other end, find the distance covered and magnitude of displacement of the person.
(A) 40 m
(B) 50 m
(C) 80 m
(D) 60 m
Correct Answer: C
7. A person travels towards north by 4 m and then turns to west and travels by 3 m. The distance and displacement are:
(A) 7 m and 5 m
(B) 7 m and 7 m
(C) 7 m and 1 m
(D) 7 m and 3.5 m
Correct Answer: A
8. A car moves half of time at 80 km/h and for rest half of time at 40 km/h. Total distance covered is 60 km. What is the average speed of the car:
(A) 60 km/h
(B) 80 km/h
(C) 120 km/h
(D) 180 km/h
Correct Answer: A
9. The ratio of the numerical values of the average velocity and average speed of a body is always:
(A) Unity
(B) Unity or less
(C) Unity or more
(D) Less than unity
Correct Answer: B
10. If a car covers 2/5th of the total distance with v1 speed and 3/5th distance with v2 then average speed is:
Correct Answer: D
11. A particle moves along the sides AB, BC, and CD of a square of side 25 m with a velocity of 15 ms–1. Its average velocity is:
(A) 15 ms–1
(B) 10 ms–1
(C) 7.5 ms–1
(D) 5 ms–1
Correct Answer: D
12. A particle moves along a semicircle of radius 10 m in 5 seconds. The average velocity of the particle is:
(A) 2 ms–1
(B) 4 ms–1
(C) 2 ms–1
(D) 4 ms–1
Correct Answer: D
13. A car travels from place A to place B at 20 km/hour and returns at 30 km/hour. The average speed of the car for the whole journey is-
(A) 25 km/hour
(B) 24 km/hour
(C) 50 km/hour
(D) 5 km/hour
Correct Answer: B
14. A particle is executing a circular motion of radius R with a uniform speed v. After completing half the circle, the change in velocity and speed will be respectively –
(A) zero, zero
(B) 2v, zero
(C) 2v, 2v
(D) zero, 2v.
Correct Answer: B
15. Average velocity in a time interval zero then in same time interval average speed is:
(A) must be zero
(B) may be zero
(C) must be non-zero
(D) maybe –ve
Correct Answer: B
16. If a car is travelling north on a straight road and its brakes are applied, it will
(A) have no acceleration
(B) accelerate to the south
(C) accelerate to the north
(D) accelerate either east or west
Correct Answer: B
17. A body moving along a straight line at 20 m/s undergoes an acceleration of – 4 m/s2. After two seconds its speed will be
(A) 8 m/s
(B) 12 m/s
(C) 16 m/s
(D) 28 m/s
Correct Answer: B
18. In which of the following cases, the object does not possess an acceleration or retardation when it moves in
(A) upward direction with decreasing speed
(B) downward direction with increasing speed
(C) with constant speed along circular path
(D) with constant speed along horizontal direction
Correct Answer: D
19. A hockey player pushes the ball on the ground. It comes to rest after travelling certain distance because
(A) the player stops pushing the ball
(B) no unbalanced force action on the wall
(C) the ball moves only when pushes
(D) the opposing force acts on the body.
Correct Answer: D
20. When a body is stationary-
(A) When position x = 0
(B) When velocity v = 0
(C) When acceleration a = 0
(D) Cannot say
Correct Answer: B
21. Average velocity is
(A) Total displacement / Total time taken
(B) Total displacement × Total time taken
(C)Total time taken / Total displacement
(D)Total distance / Total time taken
Correct Answer: A
22. A particle experiences constant acceleration for 20 seconds after starting from rest. If it travels a distance s1 in the first 10 seconds and distance s2 in the next 10 seconds, then
(A) s2 = s1
(B) s2 = 2s1
(C) s2 = 3s1
(D) s2 = 4s1
Correct Answer: C
23. If the speed is constant then the velocity must be constant.
(A) True
(B) False
Correct Answer: B
24. In the adjoining velocity-time graph
(A) Velocity is decreasing with time
(B) Deceleration is uniform
(C) The object has a negative velocity beyond the point B
(D) All are correct
Correct Answer: D
25. In the given velocity-time graph AB shows that the body has
(A) Uniform acceleration
(B) Uniform deceleration
(C) Uniform velocity throughout the motion
(D) None of these
Correct Answer: C
26. In the following velocity-time graph of a moving object
(A) Acceleration in the first 2 seconds is 2.3 ms–2
(B) Acceleration in the last 2 seconds is –2.3 ms–2
(C) Motion is uniform between second and tenth second
(D) All are correct
Correct Answer: D
27. This time-displacement graph shows
(A) An object moving with a uniform velocity
(B) An object moving with a non-uniform speed
(C) A uniformly accelerated motion
(D) No information
Correct Answer: B
28. Two balls A and B of the same mass are thrown from the top of the building. A, thrown upward with velocity V and B, thrown downward with velocity V, then –
(A) Velocity of A is more than B at the ground
(B) Velocity of B is more than A at the ground
(C) Both A and B strike the ground with same velocity
(D) None of these
Correct Answer: C
29. A ball is released from the top of a tower of height h meters. It takes T seconds to reach the ground. What is the position of the ball in T/3 seconds –
(A) h/9 meters from the ground
(B) 7h/9 meters from the ground
(C) 8h/9 meters from the ground
(D) 17h/18 meters from the ground
Correct Answer: C
30. From the given v – t graph, it can be inferred that the object is
(A) in uniform motion
(B) at rest
(C) in non-uniform motion
(D) moving with uniform acceleration
Correct Answer: A
31. A bus decreases its speed from 80 kmh–1 to 60 kmh–1 in 5s. Find the acceleration of the bus.
(A) 1.1 m/s2
(B) –1.1 m/s2
(C) 1.1 m/s
(D) –1.1 m/s
Correct Answer: B
32. A car accelerates uniformly from 18 kmh–1 to 36 kmh–1 in 5s. Calculate (i) the acceleration and (ii) the distance covered by the car in that time.
(A) 1 m/s2 , 36.5 m
(B) 1 m/s, 37.5 m2
(C) 1 m/s2 , 37.5 m
(D) 2 m/s2 , 34. m
Correct Answer: C
33. The brakes applied to a car produce an acceleration of 6 ms–2 in the opposite direction to the motion. If the car takes 2s to stop after the application of brakes, calculate the distance it travels during this time.
(A) 10 m
(B) 12 m
(C) 9 m
(D) 18 m
Correct Answer: B
34. The magnitude of the displacement of an object is always
(A) greater than the distance travelled.
(B) equal to the distance travelled.
(C) less than the distance travelled.
(D) less than or equal to the distance travelled.
Correct Answer: ( D )
35. If the distance covered is zero, the displacement
(A) cannot be zero
(B) may or may not be zero
(C) may or may not be zero
(D) depends on the particlesCorrect Answer: ( B )
36. If displacement of a particle is zero, the distance covered
(A) cannot be zero
(B) must be zero
(C) may or may not be zero
(D) depends on the particles
Correct Answer: ( C )
37. The speedometer of a car measures
(A) average speed
(B) instantaneous speed
(C) distance travelled
(D) acceleration
Correct Answer: ( B )
38. An athlete completes half a round of a circular track of radius r, then the distance covered by athlete is
(A) r
(B) 2r
(C) πr
(D) 2πr
Correct Answer: ( C )
| Chapter -1 Matter in Our Surroundings |
| Chapter – 2 Is Matter Around Us Pure? |
| Chapter -3 Atoms and Molecules |
| Chapter -4 Structure of the Atom |
| Chapter -5 The Fundamental Unit of Life |
| Chapter -6 Tissues |
| Chapter -7 Motion |
| Chapter -8 Force and Laws of Motion |
| Chapter -9 Gravitation |
| Chapter -10 Work and Energy |
| Chapter -11 Sound |
| Chapter -12 Improvement of Food Resources |