An echo is heard from a cliff after 3 s. If speed of sound is 340 m/s, distance of cliff is MCQ with Answer and Explanation

Question Report Error

An echo is heard from a cliff after 3 s. If speed of sound is 340 m/s, distance of cliff is

A. 1020 m

B. 170 m

C. 510 m

D. 340 m

Answer: Option C

Solution (By JKExamLibrary)

d = v × t / 2 = 340 × 3 / 2 = 510 m.

This question belongs to: Science Physics

Discuss this Question (0)

No comments yet. Be the first to start the discussion!

Practice More Physics Questions

Question #1 Report Error

A car decelerates uniformly from 20 m/s to rest in 4 s. Distance covered is

A. 40 m

B. 60 m

C. 20 m

D. 80 m

View Answer & Solution Discuss

Correct Answer: Option A

Explanation:
a = (0-20)/4 = -5 m/s². s = 20×4 + ½(-5)×16 = 80 - 40 = 40 m. Or average velocity 10 m/s × 4 = 40 m.

This question belongs to: Science Physics

Question #2 Report Error

Which of the following colours has the longest wavelength?

A. Red

B. Green

C. Violet

D. Blue

View Answer & Solution Discuss

Correct Answer: Option A

Explanation:
Visible spectrum: red ~700 nm, orange, yellow, green, blue, indigo, violet ~400 nm. Red has longest wavelength, lowest frequency. Violet shortest wavelength, highest frequency. Remember VIBGYOR.

This question belongs to: Science Physics

Question #3 Report Error

An object is moving in a circular path with constant speed. Which of the following remains constant?

A. Velocity

B. Kinetic energy

C. Linear momentum

D. Acceleration

View Answer & Solution Discuss

Correct Answer: Option B

Explanation:
Speed constant implies magnitude of velocity constant, so kinetic energy (½mv²) is constant. Velocity changes due to direction change. Acceleration (centripetal) is directed towards centre, changes direction. Linear momentum vector changes. So only kinetic energy remains constant.

This question belongs to: Science Physics

Explore All Physics MCQs