Free Stationary Waves MCQs with Answers
45 Stationary 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.
Stationary waves form when two waves of the same frequency and amplitude travel in opposite directions and interfere. The topic covers nodes, antinodes, wavelength, phase, resonance, and the allowed frequencies on strings and in air columns. Unlike progressive waves, stationary waves do not transfer energy from one point to another.
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45 questions · page 2 of 3
- 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: 0.60m35. A standing wave pattern is formed when the length of string is an integral multiple of wavelength.
- A. Triple.
- B. Full.
- C. Half.
- D. Double.
Explanation: Standing or stationary waves are formed when the vibrating medium is made to vibrate giving rise to a waveform without displacing the…
Correct answer: Half.- A. f = ½ √T/ml
- B. f = 1/2l √T/m
- C. f = 1/2l√T/m
- D. f = 1/2√T/m
Explanation: The fundamental frequency of a string stretched by tension T, with mass m and length l, is given by the formula f = 1/2l √T/m.
Correct answer: f = 1/2l √T/m- A. Electromagnetic waves
- B. Microwaves
- C. Stationary waves
- D. Sound waves
Explanation: When two waves of the same frequency and amplitude moving with the same speed in the opposite direction along the same path, these types…
Correct answer: Stationary waves- A. f = 1⁄2 √T/ml
- B. f = 1/2l√lT/m = 1/2l √lT/m
- C. f = 1/2l√T/m
- D. f = 1/2√T/m
Explanation: Frequency is directly proportional to tension and inversely with mass . Formula from SHM.
Correct answer: f = 1/2l√lT/m = 1/2l √lT/m- A. velocity of waves
- B. wavelength of waves
- C. nature of the medium
- D. frequency of waves
Explanation: No. of loops in stationary waves depend on frequency of waves.
Correct answer: frequency of waves- A. Crest
- B. Anti-node
- C. Node
- D. Trough
Explanation: A node is a point along a standing wave where the wave has minimum amplitude. All the particles of the string execute SHM except nodes.
Correct answer: Node