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. Bounces back such that the direction of its displacement remains same
- B. Bounces back such that the direction of its displacement is reversed
- C. Travels into second medium and the direction of its displacement is reversed
- D. Travels into second medium and the direction of its displacement remains same
Explanation: When a transverse wave, traveling in a rarer medium, encounters a denser medium, it undergoes reflection.
Correct answer: Bounces back such that the direction of its displacement is reversed- A. Towards the mean position
- B. Away from the mean position
- C. Perpendicular to the mean position upward
- D. Perpendicular to the mean position downward
Explanation: b) Away from the mean position:This option suggests that the instantaneous acceleration of a system executing SHM is directed away from…
Correct answer: Away from the mean position- A. One half
- B. Doubled
- C. Remains constant
- D. One fourth
Explanation: c) Remains constant:This option suggests that if the mass of the bob of a simple pendulum is doubled, its time period will remain…
Correct answer: Remains constant- A. Right hand
- B. Upwards
- C. Rest or mean position
- D. Extreme position
Explanation: Restoring force is always directed opposite to the object's displacement or towards the mean/equilibrium position.
Correct answer: Rest or mean position- A. Reduce mass to one fourth
- B. Quadruple the mass
- C. Reduce mass to one sixteenth
- D. Double the mass
Explanation: Frequency of the spring oscillator is directly protion to √(1/m). Thus to quadraple the frequency, we will have to reduce the mass by 1/16
Correct answer: Reduce mass to one sixteenth- A. 1s
- B. 2s
- C. 3s
- D. 4s
Explanation: T=2π(m/K)1/2 ⇒2=2π (m/K)1/2 T =2π (4m/K)1/2 ⇒T =2×2π (m/K)1/2 T =2×2=4 Sec
Correct answer: 4s- A. 3.16 ms-1
- B. 10 ms-1
- C. 100 ms-1
- D. 50 ms -1
Explanation: At the extreme displacement, the potential energy, (PE= mgh = 2x10x0.5= 10J) is equal to the total energy of the system.At the mean…
Correct answer: 3.16 ms-1- A. Inversely proportional
- B. Directly proportional
- C. Acting negative
- D. Both Options B and C are correct
Explanation: In case of simple pendulum a= -(g/l) xAccording to this equation,acceleration of a simple pendulum is directly proportional and acting…
Correct answer: Both Options B and C are correct- A. Variable
- B. Infinity
- C. Constant
- D. Zero
Explanation: Option C is correct since in an oscillation system, the energy can take various forms like potential, and kinetic but the total energy…
Correct answer: Constant- A. 2πxo/ao
- B. 2πao/xo
- C. 2πaoxo
- D. 2π/aoxo
Explanation: In simple harmonic motion, the velocity is given byV max = wxoWhere,w= 2π/TVmax = aO Therefore the equation becomesaO = {2π/T} x (xo)The…
Correct answer: 2πxo/ao- A. Variable
- B. Infinity
- C. Constant
- D. Zero
Explanation: The total energy of the system remains constant throughout the motion, and mechanical energy is conserved in simple harmonic motion.
Correct answer: Constant- A. v/3
- B. 2v
- C. 3/2 V
- D. 0
Explanation: 0 is the speed at which the object undergoes simple harmonic motion.Amplitude is xoThe speed of the object is, vThe first displacement of…
Correct answer: 0- A. Doppler effect
- B. Sonar
- C. Radar
- D. Red shift
Explanation: Option A: The Doppler effect is the change in frequency of a wave due to the motion of the source or the observer.
Correct answer: Sonar- A. 0.40 m/s
- B. 0.51 m/s
- C. 0.81 m/s
- D. 0.61 m/s
Explanation: The speed of sound is about 331.5 m/s at 0 degree-Celsius. The speed of sound increases by 0.6 meters per second (m/s) for every…
Correct answer: 0.61 m/s- A. Density of medium
- B. Pressure
- C. Temperature
- D. Moisture
Explanation: Speed of sound increases with increase in temperature. But it does not depend upon pressure.
Correct answer: Pressure- A. Increase
- B. Decrease
- C. First increase then decrease
- D. Remain the same
Explanation: In general, an increase or decrease in pressure has no effect on the speed of sound.
Correct answer: Remain the same- A. Speed does not depend on pressure
- B. Speed does not depend on density
- C. Density is proportional to pressure
- D. None of the above
Explanation: The speed of sound in a gas is determined by the properties of the medium through which it propagates.
Correct answer: Density is proportional to pressure- A. When sound reflects back
- B. When sound gets absorbed
- C. When sound penetrates into objects
- D. All of these options are correct
Explanation: Echo is the sound heard after 'reflection from a distant obstacle after the original sound has ceased".
Correct answer: When sound reflects back- A. 5Hz
- B. 5000Hz
- C. 2500kHz
- D. 50kHz
Explanation: The audible frequency for humans is 20hz-20,000Hz. Since option B is the only one that falls in this range, it is the only correct answer.
Correct answer: 5000Hz- A. (1800 * 290)/ 330
- B. (1800 * 330) / 370
- C. (1800 * 330) / 280
- D. (1800 * 330) / 380
Explanation: Doppler's formula fo=v+vo/v+vs x fs fo= 330x1800/330-50 fo=330x1800/280
Correct answer: (1800 * 330) / 280