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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- A. Period
- B. Frequency
- C. Amplitude
- D. Wavelength
Explanation: Frequency is the number of vibrations or cycles completed by a vibrating object in one second.
Correct answer: Frequency- A. 0.20 m
- B. 0.40 m
- C. 0.80 m
- D. 1.60 m
Explanation: Option C is correct since according to the formula for standing waves in an open pipe, the fundamental frequency is : v/2L.
Correct answer: 0.80 m- A. Destructive interference
- B. Constructive interference
- C. Beats
- D. Diffraction
Explanation: Destructive interference occurs when two waves with opposite phases (180 degrees out of phase) combine.
Correct answer: Destructive interference- A. The direction of its displacement remains the same
- B. The direction of its displacement is reversed
- C. The displacement disappears
- D. The displacement becomes double
Explanation: When a transverse wave traveling in a denser medium is reflected from the boundary of a rarer medium, the direction of its displacement…
Correct answer: The direction of its displacement remains the same- A. There is always a central antinod
- B. There is always a central node
- C. The sum of number of nodes and the number of antinodes is always an even number
- D. The sum of number of nodes and the number of antinodes is always an odd number
Explanation: Option A: This statement is false. In a pipe open at both ends, there is no central antinode.
Correct answer: The sum of number of nodes and the number of antinodes is always an odd number- A. 5cm
- B. 10cm
- C. 15cm
- D. 20cm
Explanation: In a pipe that is open at one end, a stationary wave can be formed when the length of the pipe is an integer multiple of one-quarter of…
Correct answer: 20cm- A. 0°
- B. 90°
- C. 180°
- D. 76°
Explanation: Explanation: When a wave traveling in a soft string reflects from a hard steel rod (fixed end), there is a phase change of 180 degrees…
Correct answer: 180°- A. Constructive
- B. Destructive
- C. Beats
- D. Resonance
Explanation: Explanation: A silence zone, or a node, is formed in a wave pattern due to destructive interference.
Correct answer: Destructive- A. 67 Hz
- B. 100 Hz
- C. 150 Hz
- D. 75 Hz
Explanation: In this scenario, the observer is stationary (v₀ = 0), and the source is moving toward the observer with a speed of one-third the speed of…
Correct answer: 150 Hz- A. n⋅λ
- B. n+1/2 ⋅λ
- C. ( 2n+1) ⋅λ2
- D. None of these
Explanation: The path difference for destructive interference is odd multiple of λ2 or (2n+1)λ2.
Correct answer: ( 2n+1) ⋅λ2- A. jm-2 s-2
- B. jm-1 s-1
- C. wm-2
- D. jm-2
Explanation: The intensity of a wave is a measure of the energy transported by the wave per unit of time and per unit of area.
Correct answer: wm-2- A. doubles
- B. is quadrupled
- C. is halved
- D. remains the same
Explanation: The frequency of a tuning circuit is given by the formula f=1/2π(LC)1/2 , where L is the inductance and C is the capacitance.If the…
Correct answer: remains the same- A. Increases
- B. Decreases
- C. Remains the same
- D. May increase or decrease
Explanation: Due to moisture in the air, the speed of sound decreases. This is because sound travels faster in dry air compared to moist air.
Correct answer: Decreases- A. four times
- B. half
- C. double
- D. zero
Explanation: In the photoelectric effect, the emission of electrons depends on the energy of the incident photons, not just their intensity.
Correct answer: zero595. Matter waves are
- A. electromagnetic waves
- B. transverse waves
- C. longitudinal mechanical waves
- D. neither electromagnetic nor mechanical waves
Explanation: Matter waves, as described by the wave-particle duality of quantum mechanics, are a unique type of wave associated with particles, such as…
Correct answer: neither electromagnetic nor mechanical waves- A. 1 m
- B. 1/2 m
- C. 1/4 m
- D. zero
Explanation: According to the theory of special relativity, objects in motion appear contracted in the direction of motion to an observer at rest.
Correct answer: zero- A. v is directly proportional to p^-1
- B. ν is directly proportional to p^1/2
- C. ν is directly proportional to p^-1/2
- D. v is directly proportional to p^0
Explanation: The speed of sound in air is directly proportional to the square root of atmospheric pressure.
Correct answer: ν is directly proportional to p^1/2- A. Time period:
- B. Frequency
- C. Velocity:
- D. Distance:
Explanation: Explanation: The number of vibrations or oscillations per second is called frequency. It is measured in hertz (Hz).
Correct answer: Frequency599. When sound waves move from one medium to another medium the quantity which remains unchanged is:
- A. Wavelength
- B. Frequency
- C. Speed
- D. Intensity
Explanation: The frequency of a sound wave is the number of oscillations or cycles per unit of time.
Correct answer: Frequency- A. (V-Vl)/ (V-Vs)
- B. V+Vl)/ (V+Vs)
- C. (V-Vs)/(V-Vl)
- D. (V+Vs)/( V+Vl)
Explanation: The Doppler effect formula for frequency is f′=v±v/s v±vr ×f, where f′ is the apparent frequency, f is the actual frequency, vr is the…
Correct answer: (V-Vs)/(V-Vl)