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.
Last updated
1,281 questions · page 54 of 65
- A. 3 m/s
- B. 4 m/s
- C. 9 m/s
- D. 5 m/s
Explanation: Frequency = No. of waves/time Frequency = 54/60 = 0.9 Hz V = Fλ V = 0.9 x 10 V = 9 m/s
Correct answer: 9 m/s- A. 22 m/s
- B. 32 m/s
- C. 27 m/s
- D. 36 m/s
Explanation: The apparent frequency of the whistle of an engine changes in the ratio 6:5.The Doppler effect is given by the following formula: f' = f *…
Correct answer: 32 m/s- A. Smaller than the transmitting wave
- B. Larger than the transmitting wave
- C. Same as that of the transmitting wave
- D. Either smaller or larger than the transmitting wave
Explanation: Source is moving away from observer so apparent frequency decreases and wavelength increases.
Correct answer: Larger than the transmitting wave- A. Blue shift
- B. Red shift
- C. No shift
- D. Green shift
Explanation: When star is moving towards earth, according to Doppler's shift wavelength decreases, as blue light has smaller wavelength so blue shift…
Correct answer: Blue shift- A. 409
- B. 429
- C. 517
- D. 500
Explanation: v' = v/(v - vs) x v v' = 330/(330-33) x 450 =500 Hz
Correct answer: 500- A. 1 kHz
- B. 3 kHz
- C. 4 kHz
- D. 6 kHz
Explanation: f' = v/(v- vs) x f = v/(v- 0.5 v) x 3 kHz = 6kHz
Correct answer: 6 kHz- A. 90 Hz
- B. 180 Hz
- C. 360 Hz
- D. 720 Hz
Explanation: Distance between a compression and the nearest rarefaction is λ/2 = 1m. Hence f = v/λ = 260/2 = 180 Hz
Correct answer: 180 Hz- A. Mechanical waves
- B. Electromagnetic waves
- C. Radio waves
- D. Light waves
Explanation: The wave which requires a medium for its propagation is known as a mechanical wave.
Correct answer: Mechanical waves- A. Interference
- B. Standing waves
- C. Beats
- D. All of these
Explanation: (a) Interference: When two or more waves meet, they interact with each other and create a combined wave.
Correct answer: All of these- A. Amplitude
- B. Velocity
- C. Frequency
- D. Wavelength
Explanation: (a) Amplitude: The amplitude of a wave represents the maximum displacement or intensity of the wave.
Correct answer: Frequency- A. Zero at each point
- B. Remain same at each point
- C. Maximum at mean position
- D. Maximum at extreme position
Explanation: The acceleration of body executing simple harmonic motion is maximum at extreme position and minimum at mean position.
Correct answer: Maximum at extreme position- A. 0.1 Nm-1
- B. 0.5 Nm-1
- C. 1 Nm-1
- D. 5 Nm-1
Explanation: To find the value of the spring constant (k), we can use Hooke's Law, which states that the force exerted by a spring is directly…
Correct answer: 1 Nm-1- A. Amplitude
- B. Mass
- C. Length
- D. Displacement
Explanation: In summary, the correct option is: b) Mass Time period of body attached to a spring is directly proportional to square root of mass.
Correct answer: Mass- A. One time
- B. Two time
- C. Three time
- D. Four time
Explanation: Correct answer : b) Two times (Option b): If the length of the pendulum is increased four times, the time period (T) of the pendulum will…
Correct answer: Two time- A. 1 Hz
- B. 2 Hz
- C. 0.2 Hz
- D. 0.5 Hz
Explanation: The frequency of a body in Simple Harmonic Motion (S.H.M) is the number of complete oscillations it makes per second.
Correct answer: 0.5 Hz- A. 1s
- B. 2s
- C. 1/2 s
- D. 0.2 s
Explanation: A. 1s: If a pendulum has a time period of 1 second, it would be referred to as a "one-second pendulum." This means that the pendulum…
Correct answer: 2s- A. 1/2 k (xo2 - x2)
- B. 1/2 k (xo2 + x2)
- C. 1/2 k (x2 - xo2)
- D. 1/2 k (x - xo)
Explanation: In summary, the correct option representing the instantaneous kinetic energy of a mass attached to the end of an elastic spring is a) 1/2…
Correct answer: 1/2 k (xo2 - x2)- A. Kinetic energy
- B. Potential energy
- C. Total energy
- D. Mechanical energy
Explanation: Total energy in S.H.M. is the sum of kinetic energy and potential energy of the oscillating object.
Correct answer: Total energy- A. Energy
- B. Amplitude
- C. Frequency
- D. All of these
Explanation: Please note that the correct option is d) All of these. In a free oscillation, the energy, amplitude, and frequency all remain constant as…
Correct answer: All of these- A. Less than the natural frequency
- B. Greater than natural frequency
- C. Equal to the natural frequency
- D. Equal to zero
Explanation: Please note that the correct option for resonance is c) Equal to the natural frequency.
Correct answer: Equal to the natural frequency