Class 9 Physics Chapter 03 Dynamics MCQs from Sindh Board Textbook

Class 9 Physics Chapter 03 Dynamics Solved Exercise MCQs with Answers 

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Here you will get 9th Class Physics solved mcqs of the 3rd Chapter "Dynamics" MCQs and Exercise with Answers from the Textbook. 

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Chapter-03 Dynamics: 9th Class Physics MCQs with Answers

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Here are the 9th class Physics 3rd chapter Dynamics solved MCQs with Answers. 

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9th Class Physics 3rd Chapter “Dynamics” Solved MCQs with Answers

01. What is the unit of momentum? 

(a) Nm

(b) Kgms-²

(c) Ns-¹

(d) Ns

Ans. D

02. Two equal and opposing forces of 10N each stretch a string. The string's tension is ___________.

(a) 10N

(b) 5N

(c) Zero

(d) 20N

Ans: (a) 10N

03. Rolling Friction is _______ than sliding Friction. 

(a) Less

(b) More

(c) Half

(d) Double

Ans: (a) Less

04. Coefficient of friction between tyre and dry road is.

A. 0.6

B. 1

C. 0.05

D. 0.2

Ans: B

05. Newton’s first law of motion is valid only in the absence of ___________.

(a) Force

(b) Net Force

(c) Friction

(d) Momentum

Ans: C

06. What is mass of body if W = 580 N ?

A. 5.8 Kg

B. 0.58 kg

C. 0.058 kg

D. 58 kg

Ans: D

07. When pushed between metal plates, which of the following materials reduces friction:

(a) Water

(b) Fine marble powder

(c) Air

(d) Oil

Ans: (d) Oil

08. Inertia depends upon:

A. Weight

B. Mass

C. Density

D. Force

Ans: B

09. In the isolated system the momentum after the collision of two bodies is ___________.

(a) Increases

(b) Constant

(c) Decreases

(d) Zero

Ans: (b) Constant

10. A moving body's acceleration is always in the direction of applied _____. 

A. Velocity

B. Force

C. Speed

D. Momentum

Ans: B

11. The coefficient of friction µs between the tyre and wet roads is ___________.

(a) 0.2

(b) 0.6

(c) 0.8

(d) 1

Ans: (a)

12. The maximum value of friction is:

A. Kinetic friction

B. Static friction

C. Limiting friction

D. Dynamic friction

Ans: C

13. Coefficient of friction between the tyre and the dry road is ____________.

(a) 0.6

(b) 1

(c) 0.05

(d) 0.2

Ans: (b) 1 

14. Which of these Scientists presented the Law of Motion?

A. Einstein

B. Newton

C. Galileo

D. Archimedes

Ans: B

15. Centripetal force always acts ________ to the motion of the body.

(a) Opposite

(b) Parallel

(c) Perpendicular

(d) Upwards

Ans: (c) Perpendicular 

16. __________ is called Gravitational pull of Earth. 

A. Weight

B. Mass

C. ^Force

D. Tension

Ans: A

17. The Rate of change of momentum is called _________.

(a) Torque

(b) Distance

(c) Force

(d) Mass

Ans: (c) Force 

18. A body jumps off a moving bus. There is a chance he will fall:

A. Towards the moving bus

B. Away form the bus

C. In the direction of motion

D. opposite to the direction of motion

Ans: C

19. Rocket Works on the Principle of:

(a) Action Reaction

(b) Mass Energy

(c) Law of Inertia

(d) Non

Ans: (a) Action Reaction

20. What is the weight of a body on earth with mass 8 kg?

A. 10 N

B. 100 N

C. 80 N

D. 8 N

Ans: C