** Class 9 Science MCQ Chapter 8 Motion**,

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**8 Motion**Question Answer## 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

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**8 Motion****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.