NCERT Class 9 Science Exploration Chapter 4 MCQ – Describing Motion Around Us – practice helps students master the key ideas of Describing Motion in a quick and effective way. This chapter explains how motion is described using reference points, distance, displacement, average speed, average velocity and average acceleration. It also covers position-time and velocity-time graphs, the kinematic equations for constant acceleration and uniform circular motion. These multiple choice questions with answers are based on the latest NCERT Exploration textbook and test both concepts and numerical skills. Solving them regularly builds accuracy, speed and confidence for class tests, periodic assessments and annual exams.
Class 9 Science Exploration Chapter 4 MCQs with Answer
Class 9 Science Chapter 4 MCQs Set 1
Q1. What is needed to describe an object’s position relative to a reference point?
[A]. Its distance and direction
[B]. Only its mass
[C]. Only its speed
[D]. Its acceleration and mass
Q2. An object is at rest relative to a reference point when its position does what?
[A]. Changes at a constant rate
[B]. Changes every second
[C]. Changes only in direction
[D]. Remains unchanged with time
Q3. A runner moves 100 m east, then 60 m west along the same straight track. What distance has she travelled?
[A]. 60 m
[B]. 100 m
[C]. 40 m
[D]. 160 m
Q4. A runner moves 100 m east, then 60 m west. What is her displacement?
[A]. 160 m east
[B]. 160 m west
[C]. 40 m east
[D]. 40 m west
Q5. A ball rises vertically and returns to its starting point. What is its displacement for the whole journey?
[A]. Its greatest height
[B]. Zero
[C]. Half its greatest height
[D]. Twice its greatest height
Class 9 Science Chapter 4 MCQs Set 2
Q6. Which statement about distance travelled and displacement is always correct?
[A]. Displacement magnitude always equals distance
[B]. Displacement magnitude exceeds distance
[C]. Displacement magnitude is always zero
[D]. Displacement magnitude is at most equal to distance
Q7. When are distance travelled and displacement magnitude equal?
[A]. Whenever motion takes one minute
[B]. During straight-line motion without reversal
[C]. During every round trip
[D]. Whenever speed changes
Q8. A student travels 120 m in 30 s. What is the average speed?
[A]. 4 m/s
[B]. 0.25 m/s
[C]. 150 m/s
[D]. 90 m/s
Q9. A swimmer covers a 25 m pool and returns to the starting end in 50 s. What are the average speed and average velocity?
[A]. Both are 1 m/s
[B]. Both are zero
[C]. 1 m/s and zero, respectively
[D]. Zero and 1 m/s, respectively
Q10. Which quantity must include direction in its complete description?
[A]. Distance travelled
[B]. Time interval
[C]. Average velocity
[D]. Average speed
Class 9 Science Chapter 4 MCQs Set 3
Q12. A car moving in one direction along a straight road increases its velocity from 10 m/s to 15 m/s in 10 s. What is its average acceleration?
[A]. 5 m/s²
[B]. 0.5 m/s²
[C]. 25 m/s²
[D]. 2.5 m/s²
Q13. Taking the direction of motion as positive, a bus slows from 15 m/s to rest in 5 s. What is its average acceleration?
[A]. −3 m/s²
[B]. +3 m/s²
[C]. +75 m/s²
[D]. −75 m/s²
Q14. A train moves very fast with constant velocity on a straight track. What is its acceleration?
[A]. Equal to its velocity
[B]. Increasing continuously
[C]. Zero
[D]. Very large
Q15. An object has non-zero constant acceleration along a straight line. Which observation must hold?
[A]. Equal distances in every equal time interval
[B]. Equal non-zero changes in velocity in every equal time interval
[C]. No change in position
[D]. A changing direction at constant speed
Class 9 Science Chapter 4 MCQs Set 4
Q16. What does a horizontal line on a position–time graph represent?
[A]. An object at rest
[B]. An object with decreasing speed
[C]. An object moving in a circle
[D]. An object with increasing speed
Q17. What does the slope of a straight line on a position–time graph give?
[A]. Acceleration
[B]. Velocity
[C]. Mass
[D]. Displacement alone
Q18. On the same position–time axes, line B has a greater positive slope than line A. What follows?
[A]. B has a greater velocity
[B]. Both objects are at rest
[C]. Both velocities must be equal
[D]. B has a smaller velocity
Q19. What does the slope of a straight line on a velocity–time graph represent?
[A]. Distance
[B]. Acceleration
[C]. Speed alone
[D]. Position
Q20. An object moves at +20 m/s for 6 s. What displacement is represented by the area under its velocity–time graph?
[A]. +14 m
[B]. +3.33 m
[C]. +120 m
[D]. +26 m
Class 9 Science Chapter 4 MCQs Set 5
Q21. A straight velocity–time line slopes down from +15 m/s to zero. What does it show?
[A]. Constant positive velocity
[B]. Zero acceleration throughout
[C]. Increasing positive acceleration
[D]. Constant acceleration opposite to the motion
Q22. Under what condition may v = u + at be used with a single constant value of a?
[A]. When acceleration is constant
[B]. Only when u = 0
[C]. When acceleration changes unpredictably
[D]. Only when v = 0
Q23. A car starts from rest and accelerates uniformly along a straight road at 4 m/s² for 6 s. What is its final velocity?
[A]. 10 m/s
[B]. 48 m/s
[C]. 1.5 m/s
[D]. 24 m/s
Q24. A car starts from rest and accelerates uniformly along a straight road at 4 m/s² for 6 s. How far does it travel?
[A]. 12 m
[B]. 72 m
[C]. 24 m
[D]. 144 m
Q25. Which equation directly connects u, v, a and s without using time?
[A]. s = ut
[B]. a = (v − u)/t
[C]. v² = u² + 2as
[D]. v = u + at
Class 9 Science Chapter 4 MCQs Set 6
Q26. A car moving at 20 m/s brakes with constant acceleration −4 m/s². What is its braking distance? A
[A]. 50 m
[B]. 80 m
[C]. 100 m
[D]. 5 m
Q27. If a car’s initial speed doubles while its constant braking deceleration remains unchanged, its braking distance becomes how many times as large?
[A]. Four
[B]. Eight
[C]. One-half
[D]. Two
Q28. A particle completes one full revolution along a circle of radius R. What are its distance and displacement magnitude?
[A]. Zero and 2πR
[B]. 2πR and zero
[C]. 2R and πR
[D]. πR and 2R
Q29. Why is uniform circular motion accelerated motion?
[A]. Its distance travelled is zero
[B]. Its mass changes
[C]. The direction of velocity keeps changing
[D]. Its speed must increase
Q30. An object completes one revolution at constant speed around a circle of radius 7 m in 22 s. Using π = 22/7, what is its speed?
[A]. 1 m/s
[B]. 14 m/s
[C]. 7 m/s
[D]. 2 m/s
NCERT Class 9 Science Exploration Chapter 4 MCQ with Answers
Important Concepts to Remember from Class 9 Science Chapter 4 Describing Motion Around Us
- The position of an object is described by its distance and direction from a fixed reference point (origin).
- An object is in motion if its position changes with time with respect to the reference point; otherwise, it is at rest.
- Distance travelled is the total path length, while displacement is the net change in position and has both magnitude and direction.
- The magnitude of displacement is always less than or equal to the total distance travelled. The two are equal only when the object moves in one direction without turning back.
- Average speed = total distance travelled ÷ time interval and average velocity = displacement ÷ time interval. The SI unit of both is m s⁻¹.
- Average acceleration = (v − u) ÷ (t₂ − t₁). Its SI unit is m s⁻², and a negative sign shows acceleration opposite to the direction of velocity.
- The slope of a position-time graph gives velocity. A straight line shows constant velocity, a curved line shows accelerated motion, and a line parallel to the time axis shows an object at rest.
- The slope of a velocity-time graph gives acceleration, and the area under it gives displacement.
- The kinematic equations v = u + at, s = ut + ½at² and v² = u² + 2as apply only when acceleration is constant.
- In uniform circular motion, speed stays constant, but the direction of velocity changes continuously, so the motion is accelerated.
Tips to Score Better in Chapter 4 Motion MCQs
- Convert units first, for example km h⁻¹ to m s⁻¹ by multiplying by 5/18.
- Read questions carefully to see whether they ask for distance or displacement, speed or velocity.
- Fix the origin and positive direction before solving numerical questions, and keep them the same throughout.
- Pay attention to signs (+ or −) for velocity and acceleration.
- Practise reading slopes and areas from position-time and velocity-time graphs.
- Choose the kinematic equation that contains the three known quantities and the one unknown.
Complete Your Chapter 4 Revision with MCQs and NCERT Solutions
Regular practice of these Class 9 Science Exploration Chapter 4 MCQs builds a strong foundation in motion, one of the most important topics in physics. The questions cover theory, graph interpretation and numericals, so students learn to apply concepts rather than memorise them. Real-life examples such as braking distance, safe gaps between vehicles and circular tracks make the chapter practical and interesting. Revise your mistakes after every attempt and go through the related textbook section again, which helps lock in the concepts for exams.
Once you are confident with these multiple choice questions, move on to the detailed exercise answers to strengthen your preparation further. Our NCERT Solutions for Class 9 Science Chapter 4 provide step-by-step explanations for all textbook questions, including numericals on kinematic equations, graph-based problems and uniform circular motion. Using MCQs and solutions together helps you understand every part of “Describing Motion Around Us” and prepares you well for school tests and annual examinations.
