Free Speed of Sound MCQs with Answers
49 Speed of Sound MCQs from Physics, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
The speed of sound depends on the properties of the medium, including its elasticity and density, and in gases it varies mainly with temperature. Questions connect speed with frequency and wavelength, compare sound in solids, liquids and gases, and distinguish the speed of propagation from the oscillating particles' motion.
Last updated
49 questions · page 2 of 3
- A. Increase.
- B. Decrease.
- C. Become zero.
- D. Remain the same.
Explanation: The correct answer is that the speed of sound will decrease as a swimmer goes deeper, where the water temperature is lower.
Correct answer: Decrease.- A. Radar.
- B. Sonar.
- C. Red shift.
- D. Blue shift.
Explanation: The correct answer is 'sonar.' Sonar is a technique that uses sound waves to detect and measure objects underwater, including ocean depth.
Correct answer: Sonar.- A. Increase in the pitch of sound.
- B. Increase in the amplitude of sound.
- C. Decrease in the frequency of sound.
- D. Decrease in the wavelength of sound.
Explanation: The correct answer is that there is a decrease in the frequency of sound when the source moves away from a stationary listener.
Correct answer: Decrease in the frequency of sound.- A. A
- B. B
- C. C
- D. D
Explanation: C) Medium Used: Gas, Thermodynamics Process: Adiabatic This is the correct option.
Correct answer: C- A. A
- B. B
- C. C
- D. D
Explanation: Doppler Effect: The Doppler effect describes the change in frequency or pitch of a sound, light, or other wave as the source and observer…
Correct answer: A- A. increases
- B. decreases
- C. becomes zero
- D. remains constant
Explanation: A) increases * Sound travels by vibrating molecules. When the temperature of a medium (like air) increases, the molecules gain more…
Correct answer: increases- A. 345 m/s
- B. 340 m/s
- C. 350 m/s
- D. 330 m/s
Explanation: Use the shortcut formula: Vx = Vs + 0.61( T)Vx= 332+ 0.61 (22)Vx= 345
Correct answer: 345 m/s- A. 931.5 Hz
- B. 105.7 Hz
- C. 135.9 Hz
- D. 153.1 Hz
- E. 164.9 Hz
Explanation: To determine the apparent frequency heard by the listener, we use the Doppler effect formula:f' = f * (v + v_o) / (v + v_s)Here, f is the…
Correct answer: 931.5 Hz- A. Adiabatic process
- B. Isothermal process
- C. Isochoric process
- D. Isobaric process
Explanation: Laplace's correction to Newton's formula recognizes that sound waves involve rapid compressions and rarefactions where there is…
Correct answer: Adiabatic process- A. (1800 x 290) / 330
- B. (1800 x 330) / 370
- C. (1800 x 330) / 280
- D. (1800 x 330) / 380
Explanation: Formula for this case, when source is moving and observer is stationary, is: f' = f (v) / (v - vs) where: f = frequency of the sound…
Correct answer: (1800 x 330) / 280- A. Humidity
- B. Pressure
- C. Temperature
- D. Density
Explanation: (A) Humidity: Humidity refers to the amount of moisture or water vapor present in the air. It does have an effect on the speed of sound.
Correct answer: Pressure- A. Doppler effect
- B. Sonar
- C. Radar
- D. Red shift
Explanation: Option A: The Doppler effect is the change in frequency of a wave due to the motion of the source or the observer.
Correct answer: Sonar- A. 0.40 m/s
- B. 0.51 m/s
- C. 0.81 m/s
- D. 0.61 m/s
Explanation: The speed of sound is about 331.5 m/s at 0 degree-Celsius. The speed of sound increases by 0.6 meters per second (m/s) for every…
Correct answer: 0.61 m/s- A. Density of medium
- B. Pressure
- C. Temperature
- D. Moisture
Explanation: Speed of sound increases with increase in temperature. But it does not depend upon pressure.
Correct answer: Pressure- A. Increase
- B. Decrease
- C. First increase then decrease
- D. Remain the same
Explanation: In general, an increase or decrease in pressure has no effect on the speed of sound.
Correct answer: Remain the same- A. Speed does not depend on pressure
- B. Speed does not depend on density
- C. Density is proportional to pressure
- D. None of the above
Explanation: The speed of sound in a gas is determined by the properties of the medium through which it propagates.
Correct answer: Density is proportional to pressure- A. When sound reflects back
- B. When sound gets absorbed
- C. When sound penetrates into objects
- D. All of these options are correct
Explanation: Echo is the sound heard after 'reflection from a distant obstacle after the original sound has ceased".
Correct answer: When sound reflects back- A. 5Hz
- B. 5000Hz
- C. 2500kHz
- D. 50kHz
Explanation: The audible frequency for humans is 20hz-20,000Hz. Since option B is the only one that falls in this range, it is the only correct answer.
Correct answer: 5000Hz- A. (1800 * 290)/ 330
- B. (1800 * 330) / 370
- C. (1800 * 330) / 280
- D. (1800 * 330) / 380
Explanation: Doppler's formula fo=v+vo/v+vs x fs fo= 330x1800/330-50 fo=330x1800/280
Correct answer: (1800 * 330) / 280- A. Square root
- B. Square
- C. Third power
- D. Third root
Explanation: Speed of sound (v) in gas is directly proportional to square root of isothermal elasticity (K) i.e.
Correct answer: Square root