NCERT Class 9 Science MCQ Chapter 4 Describing Motion Around Us English Medium As Per New Syllabus. NCERT Class 9 Science MCQ Chapter 4 Describing Motion Around Us Notes to each chapter is provided in the list so that you can easily browse throughout different chapter NCERT Class 9 Science MCQ Chapter 4 Describing Motion Around Us Question Answer Download PDF and select needs one. CBSE Class 9 Science Multiple Choice Solutions.
NCERT Class 9 Science MCQ Chapter 4 Describing Motion Around Us
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Describing Motion Around Us
Chapter – 4
| MCQ |
Tick the Correct Options:
1. What is motion in a straight line called?
(a) Circular motion.
(b) Oscillatory motion.
(c) Linear motion.
(d) Random motion.
Ans: (c) Linear motion.
2. To describe the position of an object, what do we first need to specify?
(a) Its speed.
(b) Its acceleration.
(c) A fixed reference point.
(d) Its final destination.
Ans: (c) A fixed reference point.
3. When is an object said to be at rest?
(a) If its position changes with time.
(b) If its position with respect to a reference point does not change with time.
(c) If it moves in a straight line.
(d) If its velocity is constant.
Ans: (b) If its position with respect to a reference point does not change with time.
4. What do we call the net change in the position of an object between two given instants of time?
(a) Distance.
(b) Speed.
(c) Acceleration.
(d) Displacement.
Ans: (d) Displacement.
5. Physical quantities which can be specified by just their numerical value are called:
(a) Vectors.
(b) Scalars.
(c) Displacements.
(d) Velocities.
Ans: (b) Scalars.
6. What is the SI unit for both distance travelled and displacement?
(a) Kilometre (km).
(b) Centimetre (cm).
(c) Metre (m).
(d) Millimetre (mm).
Ans: (c) Metre (m).
7. For motion in a straight line, when are the total distance travelled and the magnitude of displacement equal?
(a) When the object moves in a circle.
(b) When the object turns back.
(c) When the object moves without turning back.
(d) They are never equal.
Ans: (c) When the object moves without turning back.
8. The average speed of an object is defined as:
(a) Total distance travelled divided by time interval.
(b) Displacement divided by time interval.
(c) Change in velocity divided by time.
(d) Change in acceleration divided by time.
Ans: (a) Total distance travelled divided by time interval.
9. If an object travels equal distances in equal intervals of time, it is said to be in:
(a) Non-uniform motion.
(b) Accelerated motion.
(c) Uniform motion.
(d) Circular motion.
Ans: (c) Uniform motion.
10. In the ancient Indian text Aryabhatiya, what unit of distance was used?
(a) Metre.
(b) Mile.
(c) Yojana.
(d) Kilometre.
Ans: (c) Yojana.
11. Average velocity is calculated as:
(a) Total distance divided by time interval.
(b) Change in position (displacement) divided by time interval.
(c) Total speed divided by time.
(d) Initial velocity plus final velocity.
Ans: (b) Change in position (displacement) divided by time interval.
12. What is the SI unit of average velocity?
(a) m s⁻².
(b) km h⁻¹.
(c) m s⁻¹.
(d) cm s⁻².
Ans: (c) m s⁻¹.
13. The physical quantity that measures the change in velocity divided by the time interval is:
(a) Average speed.
(b) Average velocity.
(c) Average acceleration.
(d) Displacement.
Ans: (c) Average acceleration.
14. What is the SI unit of average acceleration?
(a) m s⁻¹.
(b) m s⁻².
(c) km h⁻¹.
(d) m.
Ans: (b) m s⁻².
15. If the magnitude of velocity of an object moving in a straight line is decreasing, its acceleration is:
(a) Zero.
(b) In the direction of velocity.
(c) Opposite to the direction of velocity.
(d) Infinite.
Ans: (c) Opposite to the direction of velocity.
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