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. A
- B. B
- C. C
- D. D
Explanation: 1 full wavelength is 2π or 360°, so half wavelength will have a 180° difference or π.
Correct answer: D- A. 0.20 m
- B. 0.40 m
- C. 0.80m
- D. 1.60m
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: 0.80m- A. 0 DEG
- B. 90 DEG
- C. 180 DEG
- D. 270 DEG
Explanation: Option C is correct since the formula becomes L=lambda, where L is the length of the tube.
Correct answer: 180 DEG- A. The open end of the pipe is a displacement antinode.
- B. Wavelength = length string / number of nodes
- C. The shape of the string at any instant shows a symmetry about the midpoint of the string
- D. Frequency = number of nodes x fundamental frequency
Explanation: For a standing wave set up in a pipe that is open at one end, the correct statement is:A.
Correct answer: The open end of the pipe is a displacement antinode.- A. 10 cm
- B. 15 cm
- C. 12.5 cm
- D. 7.5 cm
Explanation: Since, two complete loops are formed and since it is opened at one end , the length of stationary wave will be;λ/4 +λ/2+λ/2 =5λ/4This…
Correct answer: 12.5 cm- A. It undergoes a phase change of 90˚
- B. It undergoes a phase change of 180˚
- C. It undergoes a phase change of 270˚
- D. It undergoes a phase change of 0˚
Explanation: When a wave undergoes reflection at a denser medium, then its crest is reflected as troughs and vice versa.
Correct answer: It undergoes a phase change of 180˚- A. 15 cm
- B. 10 cm
- C. 5 cm
- D. 20 cm
Explanation: A pipe whose end opposite to the blowing end is open is called an open organ pipe.
Correct answer: 10 cm- A. λ
- B. 2λ
- C. λ/2
- D. λ/4
Explanation: Option A : In a stationary wave, the distance between an adjacent node and antinode is not ƛ.
Correct answer: λ/4- A. Interference
- B. Diffraction
- C. Beats
- D. Stationary waves
Explanation: Option A : The net effect of the combination of two or more wave trains moving on intersecting or coincident paths.
Correct answer: Stationary waves- A. 2
- B. 3
- C. 4
- D. 6
Explanation: Nodes and antinodes are the same in close pipe.
Correct answer: 3- A. λ
- B. 2λ
- C. λ/2
- D. λ/4
Explanation: The distance between successive nodes is half wavelength whereas the distance between a node and an antinode is quarter of a wavelength.
Correct answer: λ/4- A. Nature of displacement= antinode; Change in frequency= decrease
- B. Nature of displacement = Antinode; Change in frequency = Increase
- C. Nature of displacement= node ;Change in frequency= increase
- D. Nature of displacement= node; Change in frequency = decrease
Explanation: Option C correctly suggests that the nature of displacement in the air at the water surface remains a node, and the frequency of the first…
Correct answer: Nature of displacement= node ;Change in frequency= increase- A. 2
- B. 3
- C. 4
- D. 6
Explanation: Correct Option: CIn a stationary wave in a pipe open from both ends, the number of antinodes is always one more than the number of nodes.
Correct answer: 4- A. 4.5 cm
- B. 5 cm
- C. 2.5 cm
- D. 1.25 cm
Explanation: On a stationary wave, the distance between two successive antinodes is equal to half a wavelength.
Correct answer: 2.5 cm- A. 4.5 cm
- B. 5 cm
- C. 2.5 cm
- D. 1.25 cm
Explanation: In a stationary wave, the distance between two consecutive crests (or troughs) is known as the wavelength (λ).
Correct answer: 5 cm- A. Equal to one wavelength
- B. Equal to two wavelengths
- C. Equal to half of wavelength
- D. Equal to quarter of wavelength
Explanation: The distance between a node and its consecutive antinode is a quarter of the wavelength.
Correct answer: Equal to quarter of wavelength- A. 1.2 m
- B. 0.84 m
- C. 0.60m
- D. 0.42 m
Explanation: v= f x λλ = v/f = 480/400= 1.2 mFor the first harmonic, 2L= λ,L= λ/2= 1.2/2= 0.6 m
Correct answer: 0.60m- A. Remains same.
- B. Reduce to one half.
- C. Reduce to one quarter.
- D. Increase to twice.
Explanation: n=λD/dIf the slit spacing (d) is doubled and the distance between the slit and screen(D) is halved.
Correct answer: Reduce to one quarter.- A. (n-1)λ
- B. (n+1)λ
- C. n λ / 2
- D. 2n λ
- E. n λ
Explanation: Option A: (n-1)λ: This is the path difference for destructive interference.
Correct answer: n λ- A. y = yl * y2
- B. y = yl / y2
- C. y = yl - y2
- D. y = yl + y2
Explanation: When two waves superpose in a medium, the resulting displacement of the particle in the medium is given by the sum of the individual…
Correct answer: y = yl + y2