Free Waves MCQs with Answers
1,281 Waves MCQs from Physics, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
Progressive waves transfer energy through oscillations, with wavelength, frequency, amplitude and wave speed related by v = fλ; sound speed depends on the medium. Superposition produces interference and stationary waves in strings and organ pipes, while simple harmonic motion describes the oscillation itself and must be distinguished from wave propagation.
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1,281 questions · page 27 of 65
- A. Intensity
- B. Loudness
- C. Amplitude
- D. Velocity
Explanation: The correct answer is Velocity. The velocity of sound in air is affected by changes in air temperature because sound travels through the…
Correct answer: Velocity- 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. The velocity of particles becomes zero at the nodes.
- B. The velocity of particles becomes maximum at the nodes.
- C. The velocity of particles varies unpredictably at the nodes.
- D. The velocity of particles remains constant but non-zero at the nodes.
Explanation: The correct answer is that the velocity of particles at the nodes remains constant but non-zero.
Correct answer: The velocity of particles remains constant but non-zero at the nodes.- A. Outside the pipe.
- B. At the closed end of the pipe
- C. At the opened end of the pipe
- D. Near the middle point of the pipe
Explanation: In a closed air column, stationary waves form with nodes at the closed end and antinodes at the open end.
Correct answer: At the closed end of the pipe- A. 25 m/s
- B. 50 m/s
- C. 100 m/s
- D. 200 m/s
Explanation: * Understanding the relationship between nodes and wavelength: The distance between two consecutive nodes of a wave is equal to half a…
Correct answer: 200 m/s- A. λ/2
- B. λ/4
- C. λ
- D. 2λ
Explanation: * Since antinodes are located exactly halfway between nodes, the distance from a node to the very next antinode is half the distance…
Correct answer: λ/4- A. I only
- B. II only
- C. I and II.
- D. between I and II.
Explanation: C) I and II.Here's why: * Nodes: Nodes are points on a stationary wave where there is no displacement, meaning the string remains…
Correct answer: I and II.- A. length of the prong.
- B. force on the tuning fork.
- C. mass attached to the prong.
- D. nature of the material of the tuning fork.
Explanation: Length of the prong: Shorter prongs generally result in higher frequencies, while longer prongs produce lower frequencies.
Correct answer: force on the tuning fork.- A. Potential only
- B. Kinetic only
- C. A combination of both forms of energy
- D. There is no energy in stationary waves
Explanation: There is no energy transfer in stationary waves, but the energy of the antinodes keeps on changing from potential to kinetic energy.
Correct answer: Kinetic only- A. The tension, length and mass per unit length of the string
- B. The tension and mass per unit length of the string only
- C. The length and mass per unit length of the string only
- D. The tension and length of the string only
Explanation: The following is the solution: The frequencies of the harmonic series on a string are determined by the length of the string (L), the…
Correct answer: The tension, length and mass per unit length of the string