Now we are in 4th chapter of NCERT book for CBSE. The Physics chapter Describing Motion Around Us is one of the most important chapter of class 9. Lets have a look at some of the important points of this chapter which will help you to revise the chapter quickly.
- Motion is change in position over time.
- Linear motion occurs along a straight line.
- Position requires distance and direction.
- Reference point helps describe object position.
- Distance travelled differs from displacement.
- Displacement is net change in position.
- Average speed equals distance divided by time.
- Uniform motion has constant speed.
- Average velocity equals displacement divided by time.
- Velocity includes both magnitude and direction.
- Average acceleration is velocity change per time.
- Acceleration can result from direction changes.
- Position-time graphs represent motion visually.
- Slope of position-time graph gives velocity.
- Uniform circular motion has constant speed.
35 MCQ Questions for Class 9 Science: Chapter 4 Describing Motion Around Us
Question 1. Motion is defined as:
a) Change in shape
b) Change in position
c) Change in mass
d) Change in volume
Answer:
b) Change in position — Relative to reference point.
Question 2. Motion along a straight path is:
a) Circular motion
b) Linear motion
c) Rotational motion
d) Oscillatory motion
Answer:
b) Linear motion — Simplest type of motion.
Question 3. To describe position, we need:
a) Colour
b) Shape
c) Reference point
d) Mass
Answer:
c) Reference point — Position is relative.
Question 4. SI unit of distance is:
a) km
b) cm
c) m
d) mm
Answer:
c) m — Standard SI unit.
Question 5. Distance is a:
a) Vector quantity
b) Scalar quantity
c) Derived quantity
d) Dimensionless quantity
Answer:
b) Scalar quantity — Magnitude only.
Question 6. Displacement is a:
a) Scalar quantity
b) Vector quantity
c) Dimensionless quantity
d) Constant quantity
Answer:
b) Vector quantity — Includes direction.
Question 7. Displacement can be:
a) Greater than distance
b) Equal or less than distance
c) Always zero
d) Always greater
Answer:
b) Equal or less than distance — Shortest path.
Question 8. If start and end positions coincide:
a) Distance is zero
b) Velocity is maximum
c) Displacement is zero
d) Speed is zero
Answer:
c) Displacement is zero — No net change.
Question 9. Speed is defined as:
a) Distance × Time
b) Distance ÷ Time
c) Time ÷ Distance
d) Displacement ÷ Time
Answer:
b) Distance ÷ Time — Rate of motion.
Question 10. SI unit of speed is:
a) km/h
b) m/s
c) cm/s
d) m/min
Answer:
b) m/s — Standard SI unit.
Question 11. Uniform motion means:
a) Variable speed
b) Constant speed
c) Zero speed
d) Increasing speed
Answer:
b) Constant speed — Equal distances, equal times.
Question 12. Non-uniform motion means:
a) Constant velocity
b) Constant speed
c) Changing speed
d) Zero displacement
Answer:
c) Changing speed — Unequal distances covered.
Question 13. Velocity is:
a) Distance per time
b) Displacement per time
c) Speed only
d) Time per displacement
Answer:
b) Displacement per time — Includes direction.
Question 14. Velocity is a:
a) Scalar quantity
b) Vector quantity
c) Dimensionless quantity
d) Constant quantity
Answer:
b) Vector quantity — Magnitude and direction.
Question 15. Average speed uses:
a) Displacement
b) Distance travelled
c) Acceleration
d) Force
Answer:
b) Distance travelled — Total path considered.
Question 16. Average velocity uses:
a) Distance
b) Speed
c) Displacement
d) Mass
Answer:
c) Displacement — Net position change.
Question 17. Acceleration measures change in:
a) Distance
b) Speed
c) Velocity
d) Position
Answer:
c) Velocity — Rate of change.
Question 18. SI unit of acceleration is:
a) m/s
b) m/s²
c) km/h²
d) cm/s
Answer:
b) m/s² — Velocity change per second.
Question 19. Negative acceleration is called:
a) Rotation
b) Deceleration
c) Translation
d) Oscillation
Answer:
b) Deceleration — Speed decreases.
Question 20. An object moving at constant velocity has:
a) Positive acceleration
b) Negative acceleration
c) Zero acceleration
d) Infinite acceleration
Answer:
c) Zero acceleration — Velocity unchanged.
Question 21. Direction change causes:
a) No acceleration
b) Acceleration
c) Zero velocity
d) Constant displacement
Answer:
b) Acceleration — Velocity changes.
Question 22. Position-time graph slope gives:
a) Speed
b) Acceleration
c) Velocity
d) Force
Answer:
c) Velocity — Slope represents rate.
Question 23. Horizontal position-time graph indicates:
a) Fast motion
b) Uniform acceleration
c) Object at rest
d) Circular motion
Answer:
c) Object at rest — Position unchanged.
Question 24. Steeper position-time graph means:
a) Lower velocity
b) Higher velocity
c) Zero acceleration
d) Zero speed
Answer:
b) Higher velocity — Greater slope.
Question 25. Velocity-time graph slope gives:
a) Speed
b) Displacement
c) Acceleration
d) Distance
Answer:
c) Acceleration — Change in velocity.
Question 26. Area under velocity-time graph gives:
a) Speed
b) Force
c) Displacement
d) Acceleration
Answer:
c) Displacement — Graphical interpretation.
Question 27. Uniform velocity appears as:
a) Curved line
b) Horizontal line
c) Vertical line
d) Zig-zag line
Answer:
b) Horizontal line — Constant velocity.
Question 28. Circular motion involves:
a) Straight path
b) Rectangular path
c) Circular path
d) Random path
Answer:
c) Circular path — Around a center.
Question 29. Uniform circular motion has:
a) Constant speed
b) Constant velocity
c) Zero acceleration
d) Zero displacement
Answer:
a) Constant speed — Direction still changes.
Question 30. Earth revolves around:
a) Moon
b) Mars
c) Sun
d) Jupiter
Answer:
c) Sun — Example of circular motion.
Question 31. Speedometer measures:
a) Distance
b) Velocity
c) Speed
d) Acceleration
Answer:
c) Speed — Instantaneous value.
Question 32. Odometer measures:
a) Speed
b) Acceleration
c) Distance travelled
d) Displacement
Answer:
c) Distance travelled — Total journey length.
Question 33. If velocity increases uniformly:
a) Acceleration is uniform
b) Velocity is zero
c) Motion stops
d) Distance decreases
Answer:
a) Acceleration is uniform — Equal velocity changes.
Question 34. Distance travelled can never be:
a) Positive
b) Zero
c) Negative
d) Large
Answer:
c) Negative — Path length only.
Question 35. Displacement depends on:
a) Entire path
b) Initial and final positions
c) Speed only
d) Time only
Answer:
b) Initial and final positions — Shortest separation.
10 True and False Questions for Chapter 4 Describing Motion Around Us
Question 1. Distance is a scalar quantity. (True/False)
Answer:
True
Question 2. Displacement can never be zero. (True/False)
Answer:
False
Question 3. Velocity includes both magnitude and direction. (True/False)
Answer:
True
Question 4. An object at rest has zero velocity. (True/False)
Answer:
True
Question 5. Distance travelled can be less than displacement. (True/False)
Answer:
False
Question 6. Uniform motion means constant speed. (True/False)
Answer:
True
Question 7. Acceleration is the rate of change of velocity. (True/False)
Answer:
True
Question 8. Changing direction causes acceleration. (True/False)
Answer:
True
Question 9. The slope of a position-time graph gives velocity. (True/False)
Answer:
True
Question 10. Uniform circular motion has constant velocity. (True/False)
Answer:
False
10 Fill in the Blanks Questions for Chapter 4 Describing Motion Around Us
Question 1. Motion is a change in an object’s __________ over time.
Answer:
Position
Question 2. The SI unit of distance is the __________.
Answer:
Metre
Question 3. __________ is the shortest distance between two positions.
Answer:
Displacement
Question 4. Speed is calculated by distance divided by __________.
Answer:
Time
Question 5. Velocity is displacement divided by __________.
Answer:
Time
Question 6. The SI unit of acceleration is __________.
Answer:
m/s²
Question 7. A body moving with constant speed has __________ motion.
Answer:
Uniform
Question 8. The slope of a position-time graph gives __________.
Answer:
Velocity
Question 9. The slope of a velocity-time graph gives __________.
Answer:
Acceleration
Question 10. A car’s __________ measures the total distance travelled.
Answer:
Odometer
Question on Match the Columns
Unmatched Columns – Questions
| Column A | Column B |
|---|---|
| (i) Distance | (a) Measures total distance travelled |
| (ii) Displacement | (b) Rate of change of velocity |
| (iii) Velocity | (c) Shortest path between positions |
| (iv) Acceleration | (d) Distance covered per unit time |
| (v) Speed | (e) Distance travelled irrespective of direction |
| (vi) Odometer | (f) Displacement per unit time |
Matched Columns – Answer
| Column A | Column B |
|---|---|
| (i) Distance | (e) Distance travelled irrespective of direction |
| (ii) Displacement | (c) Shortest path between positions |
| (iii) Velocity | (f) Displacement per unit time |
| (iv) Acceleration | (b) Rate of change of velocity |
| (v) Speed | (d) Distance covered per unit time |
| (vi) Odometer | (a) Measures total distance travelled |
Related Class 9 Physics Chapters
Motion is the first physics chapter. Everything below is built on it:
- How Forces Affect Motion MCQs – what makes motion change.
- Work, Energy and Simple Machines MCQs – moving objects carry energy.
- Sound Waves MCQs – speed, wave motion and time.
Practise the numericals
Next chapter: Chapter 5 – Exploring Mixtures and their Separation
See all chapters: MCQ Questions for Class 9 Science – All 13 Chapters
