# Class 9 Science MCQ Chapter 8 Motion

Class 9 Science MCQ Chapter 8 Motion, Class 9 Science MCQ Question Answer, Class 9 Science Multiple Choice Question Answer to each chapter is provided in the list of SCERT Science Class 9 Objective Types Question Answer so that you can easily browse through different chapters and select needs one. Class 9 Science MCQ Chapter 8 Motion Question Answer can be of great value to excel in the examination.

## SCERT Class 9 Science MCQ Chapter 8 Motion

SCERT Class 9 Science MCQ Chapter 8 Motion Notes covers all the exercise questions in SCERT Science Textbooks. The NCERT Class 9 Science MCQ Chapter 8 Motion provided here ensures a smooth and easy understanding of all the concepts. Understand the concepts behind every chapter and score well in the board exams.

Motion

Chapter – 8

### Multiple Choice Questions & Answers

An object goes on a straight line path from point o to point A and take time two hours.

Answer the following questions through the diagram

1. What is the displacement in the point B? –

(a) 35 km

(b) 25 km

(c) 50 km

(d) 60 km

Ans: (b) 25 km.

2. What is average speed at the point A?

(a) 60 km/h

(b) 50km/h

(c) 30km/h

(d) 25km/h

Ans: (c) 30km/h.

3. Object runs from point O to point A. and returns from to point A to point B. The displacement is

(a) 35 km

(b) 95 km

(c) 60km

(d) 25 km

Ans: (d) 25 km.

4. An object runs from point O to point A and returns from Point A to pont D. What is the distance running by the object?

(a) 60 km

(b) 70km

(c) 65km

(d) 50km

Ans: (b) 70km.

5. S. I. Unit of displacement is –

(a) ms-¹

(b) m/s

(c) m

(d) ms-²

Ans: (c) m.

6. ms¹ is the S.I. unit of –

(a) velocity

(b) acceleration

(c) speed

(d) 60 km

(d) speed and velocity

Ans: (d) speed and velocity.

7. Automobiles are fitted with a device that shows the distance travelled. Such a device is known as –

(a) lactometer

(b) barometer

(c) odometer

(d) speed meter

Ans: (d) speed meter.

8. The speed of light is

(a) 3×10⁻¹⁰ms-¹

(b) 3×10¹ms⁻¹

(c) 3×10⁸ms⁻¹

(d) 3×1⁻⁸ms⁻¹

Ans: (c) 3×10³ms¯¹

9. ms⁻² is the S. I. unit of-

(a) speed

(b) acceleration

(c) velocity

(d) power

Ans: (b) acceleration.

10. Distance-time graph of an object moving with –

(a) uniform speed

(b) non-uniform speed

(c) uniform acceleration

(d) non uniform acceleration

Ans: (a) uniform speed.

11. Distance-time graph of a car moving

(a) uniform speed

(b) non-uniform speed

(c) uniform acceleration

(d) non-uniform acceleration

Ans: (b) non-uniform speed.

12. The velocity-time graph for uniform motion of a car shows a –

(a) straight line

(b) area of a square

(c) area of rectangle

(d) non uniform velocity

Ans: (c) area of rectangle.

13. Velocity-time graph for a car moving with-

(a) uniform speed

(b) non-uniform speed

(c) uniform acceleration

(d) non uniform speed acceleration

Ans: (c) uniform acceleration.

14. Velocity-time graph of an object is –

(a) non uniform accelerated motion

(b) uniformly accelerated motion

(c) uniform speed motion

(d) non uniform speed motion

Ans: (a) non uniform accelerated motion.

15. An object is moving along the circular path, then the direction of its changes at

(a) square point

(b) rectangular point

(c) hexagonal point

(d) every point

Ans: (d) every point.

16. The circumference of a circle of radius r is

(a) πr

(b) 2πr

(c) πr/2

(d) 3Пr

Ans: (b) 2πr.

17. An object moves in circular path, radius r and velocity v, and time t, then –

(a) v =πr/t

(b) v = πrt

(c) v =2πr/t

(d) v = 2πrt

Ans: (c) v=2π/t.

18. Which of the following is the example of circular motion?

(a) motion of a bicycle

(b) motion of a cricket ball

(c) motion of the moon around the earth

(d) motion of a snake

Ans: (c) motion of the moon around the earth.

19. A straight line graph helps in solving a linear equation having –

(a) three variables

(b) two variables

(c) one variable

(d) none of the above

Ans: (b) two variables.

20. which of the following is correct?

(a) planet is moving

(b) star is moving

(c) galaxy is moving

(d) all of the above

Ans: (d) all of the above.

#### Very Short Answer Type Questions

1. What is called origin?

Ans: To describe the position of an object it need to specify a reference point called the origin.

2. What is the simplest motion?

Ans: The simplest type of motion is the motion along a straight time.

3. What is called displacement?

Ans: The shortest distance measured from the initial to the final position of an object is known as the displacement.

4. What do you mean by odometer?

Ans: Automobiles are fitted with a device that shows the distance travelled. Such a device is known as an odometer.

5. What is called uniform motion?

Ans: The object covers equal distance in equal intervals of time. It is said to be in uniform motion.

6. What is called non-uniform motion?

Ans: A object covers unequal distance is equal intervals of time is called non uniform motion.

7. Give an example of non-uniform motion.

Ans: a car is moving or an crowded street.

8. What do you mean by speed?

Ans: Measuring the rate of motion of an object is to find out the distance travelled by the object in unit time. This quan

9. What is S. I. unit of speed?

Ans: metre per second.

10. What is the symbol of metre per second?

Ans: ms-¹ or m/s

11. What do you mean by average speed?

Ans: Average speed

total distance travelled

= ——————————————

Total time taken

12. A car travels a distance of 100 km in 2 h. What is the speed of the car?

100km

Ans: ————= 50kmh⁻¹

2h

13. What do you mean by velocity?

Ans: a definite direction, the speed is called velocity.

14. What is the S.I. unit of velocity?

Ans: metre per second.

15. What do you mean by average velocity?

Ans: Average velocity

initial velocity + final velocity

=  ——————————————

2

16. What is the speed of sound in air?

Ans: 346 ms⁻¹.

17. What do you mean by acceleration?

Ans: A measure of the change is the velocity of an object per unit time is called acceleration.

18. What is S.I. unit of acceleration?

Ans: ms⁻².

19. When does show the acceleration positive or negative.

Ans: The acceleration is positive if its direction of the velocity and negative when it is opposite to the direction of velocity.

20. What is the expression of acceleration in mathematically?

Ans: initial value u, final value v, time t, the

V – U

acceleration a is a = ————

t

21. Starting from a stationary position, Rahul paddless his bicycle to attain a velocity of 6ms-¹ is 30 seconds. Calculated the acceleration.

v – u

Ans: a = ———

t

6ms¹-0ms⁻¹

= ——————

30s

6ms⁻¹

= ————

30s

= 0.2ms⁻²

22. Write the relation among the initial velocity (u), final velocity (v) acceleration (a) and time (t)

Ans: v = u + at.

23. Write the relation among the initial velocity (u), distance (s) and time (t)

Ans: s = ut+½ at².

24. Write the relation among the initial velocity (u), final velocity (v), acceleration (a) and distance (s)

Ans: 2as v² – u²

25. A radius of a circle is r. What is the circumference of the circle?

Ans: 2as = V² – U².

26. What is called circular motion?

Ans: An object moves is a circular path with uniform speed, its motion is called uniform circular motion.

27. If the athlete takes t seconds to go once around the circular path of radius r. What is the velocity v?

2πr

Ans: v = ————

t

28. Write an example of an acceleration motion?

Ans: The motion of the athlete moving along a circular path is therefore, an example of an accelerated motion.

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