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Physics : Class 9 Science MCQ Practice Questions & Answers (Sanskrit) - Page 4 - ObjectiveMcq

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PracticeClass 9 ScienceSciencePhysics

Physics in Class 9 Science : Practice MCQ Questions & Answers with Explanations

69 practice sets · Page 4 of 4

Class 9 ScienceMediumSciencePhysicsMotion

61.

What is the term for motion along a straight line?

A

Circular motion

B

Rectilinear motion

C

Vibrational motion

D

Rotational motion

Correct Answer:

B — Rectilinear motion

Explanation:

Motion along a straight path is called rectilinear motion.

Class 9 ScienceMediumSciencePhysicsMotion

62.

An object travels 10 m east and then 10 m west. What is its displacement?

A

20 m

B

10 m

C

0 m

D

5 m

Correct Answer:

C — 0 m

Explanation:

The object returns to its starting point, so displacement is zero.

Class 9 ScienceMediumSciencePhysicsMotion

63.

What is the SI unit of acceleration?

A

m/s²

B

m/s

C

km/h

D

s/m

Correct Answer:

A — m/s²

Explanation:

The SI unit of acceleration is meter per second squared (m/s²).

Class 9 ScienceMediumSciencePhysicsTemperature

64.

Which of the following is the SI unit of temperature?

A

Joule

B

Kelvin

C

Celsius

D

Fahrenheit

Correct Answer:

B — Kelvin

Explanation:

Kelvin (K) is the SI unit of temperature.

Class 9 ScienceMediumPhysicsSound

65.

What is the approximate speed of sound in air at room temperature?

A

400 m/s

B

343 m/s

C

330 m/s

D

220 m/s

Correct Answer:

B — 343 m/s

Explanation:

The speed of sound in air at room temperature is approximately 343 m/s.

Class 9 ScienceMediumPhysicsWork And Energy Kinetic Energy

66.

A car of mass 1000 kg is moving at a speed of 20 m/s. What is its kinetic energy?

A

200 kJ

B

400 kJ

C

100 kJ

D

300 kJ

Correct Answer:

A — 200 kJ

Explanation:

Kinetic energy = 1/2 mv² = 1/2 × 1000 × 20² = 200000 J = 200 kJ.

Class 9 ScienceMediumPhysicsGravitation

67.

Who formulated the law of universal gravitation?

A

Albert Einstein

B

Galileo Galilei

C

Isaac Newton

D

Johannes Kepler

Correct Answer:

C — Isaac Newton

Explanation:

Isaac Newton formulated the law of universal gravitation.

Class 9 ScienceMediumPhysicsMotion Equations Of Motion

68.

Which of the following is the correct formula for velocity?

A

v = u + at

B

v = u - at

C

v = u × at

D

v = u + a/t

Correct Answer:

A — v = u + at

Explanation:

The equation v = u + at gives the final velocity for uniformly accelerated motion.

Class 9 ScienceMediumPhysicsMotion Speed

69.

What is the SI unit of speed?

A

Kilometer

B

Meter per second

C

Second

D

Meter

Correct Answer:

B — Meter per second

Explanation:

The SI unit of speed is meter per second (m/s).

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