Sounds Waves And Motion - Study Mode

Show All Answers

[#251] Which of the following statements are true/false about the speed of sound in different mediums on 25°C A. In water (marine), the speed of sound is 1531 m/s. B. In ethanol, the speed of sound is 1200 km/s.

(A) Only A is correct

(B) Neither A nor B is correct

(C) Only B is correct

(D) Both A and B are correct

Correct Answer

(A) Only A is correct

[#252] Longitudinal waves cannot travel through

(A) vacuum

(B) solid

(C) liquid

(D) gas

Correct Answer

(A) vacuum

[#253] To hear different echoes, the minimum distance of obstruction from the source of sound should be . . . . . . . .

(A) 172 m

(B) 17.2 m

(C) 344 m

(D) 34.4 m

Correct Answer

(B) 17.2 m

[#254] The velocity of a particle performing simple harmonic motion when it passes through its mean position is

(A) infinity

(B) zero

(C) minimum

(D) maximum

Correct Answer

(D) maximum

[#255] The sounds having a frequency of 20 Hz to 20000 Hz are known as

(A) audible sounds

(B) ultrasonics

(C) infrasonics

(D) megasonics

Correct Answer

(A) audible sounds