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 26 of 65
- A. Increase
- B. Decrease
- C. Become zero
- D. Remain constant
Explanation: The correct answer is Option B:decrease. The frequency of a simple pendulum is inversely related to the square root of its length.
Correct answer: Decrease- A. The kinetic energy is maximum at both positions.
- B. The kinetic energy is zero at both positions.
- C. The kinetic energy is zero at the extreme position and maximum at the mean position.
- D. The kinetic energy is maximum at the extreme position and zero at the mean position.
Explanation: When the bob of a simple pendulum is at its extreme position, it momentarily stops before changing direction, causing its kinetic energy…
Correct answer: The kinetic energy is zero at the extreme position and maximum at the mean position.- A. T/2
- B. T
- C. 2T
- D. infinite
Explanation: When the elevator falls freely, it is in a state of free fall, meaning both the elevator and the pendulum are accelerating downwards at…
Correct answer: infinite- A. 0.405 s
- B. 1.269 s
- C. 2.007 s
- D. 12.44 s
Explanation: The time period of a simple pendulum is determined by the formula \( T = 2\pi\sqrt{\frac{L}{g}} \), where \( L \) is the length of the…
Correct answer: 1.269 s- A. Become zero.
- B. Remain the same.
- C. Decrease four times.
- D. Increase.
Explanation: The time period of a simple pendulum is given by the formula T = 2π√(L/g), where L is the length of the pendulum and g is the acceleration…
Correct answer: Increase.- A. Option A: A sinusoidal graph showing periodic variation.
- B. Option B: A parabolic graph showing a squared relation.
- C. Option C: A linear graph showing a direct proportion.
- D. Option D: A constant graph showing no variation.
Explanation: The correct answer is Option B. In simple harmonic motion, the kinetic energy (KE) of a particle is given by the equation KE = (1/2)mv²…
Correct answer: Option B: A parabolic graph showing a squared relation.- A. Beats.
- B. Resonance.
- C. Free oscillations.
- D. Forced oscillations.
Explanation: The correct answer is forced oscillations. When a force is repeatedly applied to an oscillator, it causes the system to oscillate at the…
Correct answer: Forced oscillations.- A. 0.25 m.
- B. 0.50 m.
- C. 1.00 m.
- D. 2.00 m.
Explanation: T = 2π√(L/g)Where: * T = Time period = 1 s * L = Length of the pendulum (what we need to find) * g = Acceleration due to gravity = 10 m/s²…
Correct answer: 0.25 m.- A. 0 s
- B. 1 s
- C. 2 s
- D. ∞
Explanation: When an elevator falls freely towards the Earth, the effective acceleration due to gravity (g_effective) inside the elevator becomes zero.
Correct answer: ∞- A. 0.996 m.
- B. 1.282 m.
- C. 1.992 m.
- D. 3.120 m.
Explanation: T = 2π√(L/g)Where: * T = Time period = 2 s * L = Length of the pendulum (what we need to find) * g = Acceleration due to gravity = 9.8…
Correct answer: 0.996 m.- A. A
- B. B
- C. C
- D. D
Explanation: The time period of a simple pendulum is directly proportional to the square root of its length and inversely proportional to the square…
Correct answer: D- A. Displacement is maximum
- B. Half way between them
- C. Crossing mean position
- D. At rest
Explanation: The restoring force of Simple Harmonic Motion (SHM) is maximum when the displacement of the particle is maximum.
Correct answer: Displacement is maximum- A. Reduce the mass to one fourth
- B. Quadruple the mass
- C. Double the mass
- D. Half the mass
Explanation: The frequency of a spring oscillation is given by the formula:f = 1 / (2π) √(k/m)Where f is the frequency, k is the spring constant, and m…
Correct answer: Reduce the mass to one fourth- A. 0.51 xo
- B. 0.61 xo
- C. 0.71 xo
- D. 0.81 xo
Explanation: In Simple Harmonic Motion (S.H.M.), the kinetic energy (K.E.) and potential energy (P.E.) of a particle oscillating about its mean…
Correct answer: 0.71 xo- A. Displacement is zero
- B. Amplitude is zero
- C. Velocity is a zero
- D. P.E is zero
Explanation: Correct option c) Velocity is zero: At the extreme positions (the points where the body momentarily stops before changing direction) in…
Correct answer: Velocity is a zero- A. Density of solids is high and elasticity is low
- B. Both density and elasticity are low
- C. Density is low and elasticity is high
- D. Elasticity of solids is very high
Explanation: Here is the explanation of the correct optionThe velocity of sound is greater than in gases primarily because solids have much higher…
Correct answer: Elasticity of solids is very high- A. I only.
- B. III only.
- C. I and II.
- D. II and III.
Explanation: The speed of sound in a medium is influenced by both the density and elasticity of the medium.
Correct answer: II and III.- A. I only.
- B. III only.
- C. I and II.
- D. II and III.
Explanation: The velocity of sound is affected by temperature because sound travels faster in warmer air, due to the increased speed of air molecules.
Correct answer: I only.- A. Varies unpredictably.
- B. Remains the same as the original sound.
- C. Becomes less than the frequency of the original sound.
- D. Becomes greater than the frequency of the original sound.
Explanation: When a fire brigade approaches a stationary listener, the sound waves from the siren are compressed, causing the listener to perceive a…
Correct answer: Becomes greater than the frequency of the original sound.- A. Increases.
- B. Decreases.
- C. Becomes zero.
- D. Remains unchanged.
Explanation: The Doppler effect describes the change in frequency of a wave in relation to an observer who is moving relative to the wave source.
Correct answer: Decreases.