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. Concave lens
- B. Convex lens
- C. Convex mirror
- D. Plane mirror
Explanation: The trough of a wave is the lowest point on the wave.A concave lens is a lens having one of both surfaces curved inwards.
Correct answer: Concave lens742. When a source is moving towards a stationary observer, the apparent change in frequency will be:
- A. Greater than the original frequency
- B. Remains the same as that of original frequency
- C. Smaller than the original frequency
- D. None of the above
Explanation: Option A: The apparent change in frequency will be greater than the original frequency when a source is moving towards a stationary…
Correct answer: Greater than the original frequency- A. 50 Hz
- B. 100 Hz
- C. 150 Hz
- D. 200 Hz
Explanation: The following is the solution:since v = f × λ330 = f × 3.3f = 100 HzSo the answer is B.
Correct answer: 100 Hz- A. Varying the diameter or by changing the length
- B. Varying the tension or by changing the thickness
- C. Varying the tension or by changing the length
- D. Varying the thickness or by changing the length
Explanation: Varying the tension leads to increase or decrease in frequency, while changing the length of the string also changes the frequency.
Correct answer: Varying the tension or by changing the length- A. an odd multiple of quarter wavelength
- B. an integral multiple of quarter wavelength
- C. an integral multiple of wavelength
- D. an integral multiple of half wavelength
Explanation: A standing wave pattern is formed when the length of the string is an integral multiple of half wavelength.
Correct answer: an integral multiple of half wavelength- A. 4.5 cm
- B. 5 cm
- C. 2.5 cm
- D. 1.25 cm
Explanation: Loops of stationary waves consists of nodes and antinodes . The distance between two consective antinodes (crest) or nodes (trough) is…
Correct answer: 2.5 cm- A. Antinode
- B. Node
- C. Rarefaction
- D. Crest
Explanation: A node is a point of zero amplitude in a standing wave. In a closed-open pipe, the closed end acts as a node because the air particles at…
Correct answer: Node- A. Speed
- B. Frequency
- C. Amplitude
- D. Wavelength
Explanation: Applying the phenomenon of beat unknown frequency, 'n' of a tuning fork can be measured.
Correct answer: Frequency- A. Sum of the number of antinodes and the number of nodes is always even
- 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: A string plucked from 1/2 of the length or any of the further harmonics shows symmetry about it's midpoint, if the wave pattern is divided…
Correct answer: The shape of the string at any instant shows a symmetry about the midpoint of the string- A. A quarter of wavelength
- B. 3/4 of wavelength
- C. One wavelength
- D. Half of wavelength
Explanation: The approximate distance between a node and the immediate next antinode is actually 'one-fourth of a given wavelength'.In other words, the…
Correct answer: A quarter of wavelength- A. 1 m/s
- B. 10 m/s
- C. 2 m/s
- D. 40 m/s
Explanation: Frequency=10/2=5HzWavelength=0.20mVelocity= frequency x wavelength=1m/s
Correct answer: 1 m/s- A. Displacement of medium = parallel to the energy transfer Direction of the propagation of wave = parallel to the energy transfer
- B. Displacement of medium = parallel to the energy transfer Direction of the propagation of wave = perpendicular to the energy transfer
- C. Displacement of medium = perpendicular to the energy transfer Direction of the propagation of wave = parallel to the energy transfer
- D. Displacement of medium= perpendicular to the energy transfer Direction of the propagation of wave = perpendicular to the energy transfer
Explanation: Option A) Longitudinal waves are the waves in which the displacement of the particles/medium is parallel to the direction of propagation…
Correct answer: Displacement of medium = parallel to the energy transfer Direction of the propagation of wave = parallel to the energy transfer- A. 10 cm
- B. 20 cm
- C. 30 cm
- D. 40 cm
Explanation: Phase difference= (2π)/(wavelength) x (distance between the two points) Phase difference = 2π/λ x distance between two points π/3 = 2π/λ x…
Correct answer: 30 cm- A. 5 Hz
- B. 5000 Hz
- C. 2500 kHz
- D. 50 kHz
Explanation: Humans can detect sounds in a frequency range from about 20 Hz to 20 kHz.
Correct answer: 5000 Hz- A. 0°
- B. 90°
- C. 180°
- D. 270°
Explanation: In a pipe that is open at one end and closed at the other, the stationary wave pattern for the second harmonic consists of a node at the…
Correct answer: 180°- A. Speed = frequency x wavelength
- B. Speed x frequency = wavelength
- C. Speed = frequency / wavelength
- D. Speed = frequency + wavelength
Explanation: This is the standard formula for the speed of an electromagnetic wave, c = fλWhere c is the speed of the wave, f is the frequency of the…
Correct answer: Speed = frequency x wavelength- A. 1500 m/s
- B. 5000 m/s
- C. 330 m/s
- D. 50 m/s
Explanation: Correct option is B.The speed of sound in metal is approximately 5000 meters per second.The speed of sound in solid is 6000 meters per…
Correct answer: 5000 m/s- A. It undergoes a phase change of 90 degrees
- B. It undergoes a phase change of 180 deg
- C. It undergoes a phase change of 270 degrees
- D. It undergoes a phase change of 0 degrees
Explanation: Phase change of 180 degrees: This means that the crest of the reflected wave is 180 degrees out of phase with the crest of the incident…
Correct answer: It undergoes a phase change of 180 deg- A. 2
- B. 3
- C. 4
- D. 6
Explanation: When organ pipe is closed at one end Number of nodes = number of antinodes Refer to the diagram antinodes and nodes.
Correct answer: 3- A. π
- B. 2π
- C. 3π
- D. 3π/4
Explanation: Correct option is B. The distance between the two points in the wavelength of the wave is 0.1 m is equal to 10 cm Thus it is obvious that…
Correct answer: 2π