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. frequency
- B. period
- C. Wave length
- D. phase difference
Explanation: The distance between two successive crests or two successive troughs is one wavelength, λ.
Correct answer: Wave length- A. energy
- B. mass
- C. both
- D. none
Explanation: A wave transfers energy from one location to another while the particles of the medium mainly oscillate about their mean positions.
Correct answer: energy- A. Time period
- B. Frequency
- C. Unity
- D. Velocity
Explanation: Frequency is the reciprocal of time period, so f = 1/T. Therefore, T(s) × f(s^-1) = 1, which is unity and has no unit; the likely mistake…
Correct answer: Unity- A. Maximum as well minimum
- B. Minimum only
- C. Maximum only
- D. 0
Explanation: At resonance, the driving frequency equals the system's natural frequency, allowing energy transfer to build up most effectively and…
Correct answer: Maximum only- A. Drag force of air
- B. Gravity
- C. Tension in the string
- D. None of these
Explanation: Damping removes mechanical energy from the pendulum, mainly through air resistance or drag, so the amplitude gradually decreases.
Correct answer: Drag force of air- A. 10 cm
- B. 5 cm
- C. 15 cm
- D. 7.5 cm
Explanation: During one complete vibration, the body travels from one extreme to the other and back, giving a total distance of 4A.
Correct answer: 5 cm- A. Gravity
- B. Spring
- C. Hand
- D. All of these
Explanation: For a simple pendulum, the component of the bob's weight tangential to the path pulls it back toward the mean position and acts as the…
Correct answer: Gravity- A. Mean position
- B. Elsewhere
- C. Extreme position
- D. None
Explanation: In SHM, displacement is measured from the mean position and has its greatest magnitude at either extreme position, where it equals the…
Correct answer: Extreme position- A. Mean position
- B. Extreme position
- C. Both A and B
- D. None
Explanation: For a mass-spring oscillator, speed is maximum at the mean position because the displacement and spring potential energy are zero there…
Correct answer: Mean position- A. Increase
- B. Decrease
- C. Remains the same
- D. Is zero
Explanation: The pendulum period is T = 2π√(L/g). At Murree, g is smaller than at the reference location, so T increases for the same length L.
Correct answer: Increase- A. Vibratory motion
- B. Rotatory motion
- C. S.H.M
- D. Both A and C
Explanation: A mass attached to an ideal spring moves repeatedly to and fro, which is vibratory motion, and its restoring force is proportional to…
Correct answer: Both A and C- A. Simple harmonic vibration
- B. Natural vibration
- C. Driven harmonic vibration
- D. Free vibration
Explanation: Forced vibration occurs when an external periodic force drives an oscillator, so it is also called driven harmonic vibration.
Correct answer: Driven harmonic vibration- A. Amplitude of vibration
- B. Energy of vibration
- C. Both amplitude and energy
- D. Neither amplitude nor energyCalibrating Electrical Test And Measurement Equipment
Explanation: Damping removes energy from an oscillator, causing its amplitude to decrease with time.
Correct answer: Both amplitude and energy- A. P.E is zero
- B. Acceleration is zero
- C. Restoring force is zero
- D. All P.E acceleration and restoring force are zero
Explanation: Kinetic energy in SHM is maximum at the mean position, where displacement is zero.
Correct answer: All P.E acceleration and restoring force are zero- A. Amplitude
- B. Square of the amplitude
- C. 2 x amplitude
- D. 4 x amplitude
Explanation: In one complete vibration, the bob travels from one extreme to the other, a distance 2A, and then returns, another 2A.
Correct answer: 4 x amplitude- A. Directly proportional to the damping force
- B. Inversely proportional to the damping force
- C. Equal to the square of damping force
- D. Equal to the square of damping force
Explanation: Resonance becomes sharper when damping is smaller because less energy is lost per cycle, so the oscillator responds strongly over a…
Correct answer: Inversely proportional to the damping force- A. Displacement only
- B. The direction of motion only
- C. Both displacement and direction of motion
- D. Neither displacement nor direction of motion
Explanation: The phase of SHM specifies the particle's state at a particular instant, including its displacement and the direction of its motion…
Correct answer: Both displacement and direction of motion- A. T.V
- B. Radio
- C. Microwave oven
- D. Bulb
Explanation: Television and radio tuning use resonance to select a desired frequency, and microwave ovens use resonant production and absorption of…
Correct answer: Bulb- A. 100 cm
- B. 99 cm
- C. 99.2 cm
- D. 98 cm
Explanation: A second pendulum has time period T = 2 s. Using T = 2π√(L/g), L = g(T/2π)² = 9.81 m/s² x (2 s/2π)² ≈ 0.993 m = 99.3 cm, which rounds to…
Correct answer: 99.2 cm- A. 1
- B. 2
- C. 3
- D. 4
Explanation: Frequency and time period are reciprocals: f = 1/T. Therefore fT = (1/T)T = 1, a dimensionless quantity.
Correct answer: 1