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 55 of 65
- A. Frequency
- B. Speed
- C. Phase
- D. Wavelength
Explanation: Please note that the correct option for the property of sound that changes when there is wind blowing from the listener towards the source…
Correct answer: Speed- A. Same as that of the individual waves
- B. Twice that of the individual waves
- C. Half that of the individual waves
- D. Triple that of the individual waves
Explanation: When a stationary wave is formed, its frequency remains the same as that of the individual waves. So the correct option is (a).
Correct answer: Same as that of the individual waves- A. Doubled
- B. Halved
- C. Quadrupled
- D. One fourth
Explanation: (a) If the amplitude of a wave is doubled, its intensity is not doubled. The correct answer is not (a).
Correct answer: Quadrupled- A. 11/10
- B. [11/10]-2
- C. [9/10]-2
- D. 10/9
Explanation: When a sound source is moving towards a stationary listener, the frequency of the sound appears higher to the listener compared to the…
Correct answer: 10/9- A. Mechanical resonance
- B. Electrical resonance
- C. Musical resonance
- D. Free vibration
Explanation: (a) Mechanical resonance: Mechanical resonance refers to the natural frequency at which an object vibrates with maximum amplitude.
Correct answer: Electrical resonance- A. S. H. M
- B. Damped Oscillation
- C. Resonance
- D. Free oscillation
Explanation: (a) SHM (Simple Harmonic Motion): Simple Harmonic Motion refers to the back-and-forth motion of an object around a stable equilibrium…
Correct answer: Resonance- A. Tk = TM
- B. Tk > TM
- C. Tk < TM
- D. 2Tk = 3TM
Explanation: Height of Karachi is about 500 m whereas height of Murree is 2291 m. Therefore, g has smaller value in Murree than Karachi.
Correct answer: Tk < TM- A. Variable
- B. Low
- C. High
- D. Constant
Explanation: (a) Variable: If the total energy of a vibrating mass and spring in an isolated system is variable, it means that the energy can change…
Correct answer: Constant1089. While deriving the equation of time period for simple pendulum which quantity should be kept small:
- A. Length of simple pendulum
- B. Amplitude
- C. Mass of simple pendulum
- D. Gravitational acceleration
Explanation: (a) Length of a simple pendulum: The length of a simple pendulum does affect the time period, but it doesn't need to be kept small.
Correct answer: Amplitude- A. 1s
- B. 2s
- C. 3s
- D. 4s
Explanation: The formula for the period of a mass-spring system is: T = 2π √(m/k) Where: T is the period of oscillation, m is the mass of the object…
Correct answer: 4s- A. (k1+k2)/2
- B. k1 +k2
- C. k1k2/(k1 +k2)
- D. √k1k2
Explanation: When two springs are joined in series, they are connected end to end. In this configuration, the total displacement of the combined system…
Correct answer: k1k2/(k1 +k2)- A. 170hz, 340hz, 510hz
- B. 120hz, 220hz, 390hz
- C. 90hz, 230hz, 440hz
- D. 210hz, 410hz, 510hz
Explanation: The frequencies of the fundamental and the first two harmonics for a pipe open at both ends are 170 Hz, 340 Hz, and 510 Hz, respectively…
Correct answer: 170hz, 340hz, 510hz- A. 20 cm
- B. 5 cm
- C. 10 cm
- D. 30 cm
Explanation: A pipe whose end opposite to the blowing end is open is called an open organ pipe.
Correct answer: 20 cm- 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: Since the cylinder is half filled with water, we can treat this as a pipe where it is closed on one end and open on the other.
Correct answer: Nature of displacement = node change in frequency = increase- A. L
- B. 2L
- C. 3L
- D. 4L
Explanation: In a tube with two open ends f1 = v/2L, λ = v/f = 2L.In a tube with one open end and one closed end f1 = v/4L, λ = v/f = 4L.
Correct answer: 4L- A. L2
- B. 2 L
- C. 3 L
- D. 4 L
Explanation: In a tube with one open end and one closed end f1 = v/4L, λ = v/f = 4L
Correct answer: 4 L- A. 4
- B. 6
- C. 1/5
- D. 5
Explanation: The frequency of the nth harmonic of a stationary wave in a pipe of length L open at one end and closed at the other is given by: fn =…
Correct answer: 5- A. Intensity of sound
- B. Frequency of sound
- C. Wavelength of sound
- D. Pitch of sound
Explanation: The loudness of a sound relates the intensity of any given sound to the intensity at the threshold of hearing.
Correct answer: Intensity of sound- A. Wavelength
- B. Amplitude
- C. Frequency
- D. Crest
Explanation: The amplitude of a wave is the maximum displacement of particles on either side of the equilibrium or mean position of the wave.
Correct answer: Amplitude- A. 2m
- B. 1.5 m
- C. 1m
- D. 0.5 m
Explanation: Two waveforms are shown, the total wavelengths being 2 which leads to the individual wavelength being 1 m
Correct answer: 1m