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. 25 cm
- B. 50 cm
- C. 100 cm
- D. 75 cm
Explanation: The fundamental wavelength for an organ pipe closed at one end is given by the formula λ = 4L/n, where L is the length of the pipe and n…
Correct answer: 100 cm- A. Metals
- B. Solids
- C. Fluids
- D. Soil
Explanation: For transverse waves the displacement of the medium is perpendicular to the direction of propagation of the wave.Transverse waves cannot…
Correct answer: Fluids- A. Doppler Effect
- B. Beats
- C. Interference
- D. All of the above
Explanation: Explanation:The Doppler effect is the phenomenon where the frequency of a wave (such as light or sound) appears to change when the source…
Correct answer: Doppler Effect1184. The information received at the other end of a fibre can be inaccurate due to of the light signal.
- A. Longer wavelengths
- B. Frequency
- C. Intensity
- D. Dispersion or Spreading
Explanation: Explanation:Dispersion is a phenomenon in which the different wavelengths of light travel at different speeds through a fibre, causing the…
Correct answer: Dispersion or Spreading- A. Option A
- B. Option B
- C. Option C
- D. Option D
Explanation: The formula to calculate the apparent frequency (f°) of a sound wave due to the Doppler effect is given by:f°= (V± Uo/ V± Ui) × fwhere V…
Correct answer: Option B- A. 2-2000 kHz
- B. 15-50000 kHz
- C. 20-20000 Hz
- D. 20-20000 kHz
Explanation: Hearing range describes the range of frequencies that can be heard by humans or other animals, though it can also refer to the range of…
Correct answer: 20-20000 Hz- A. Halved.
- B. Doubled.
- C. Unchanged.
- D. Increase four times.
Explanation: The time period of a pendulum does not depend on the mass of the bob. So if the mass of bob is doubled, the time period will remain…
Correct answer: Unchanged.- A. l
- B. 1/l
- C. √l
- D. 1/ √l
Explanation: f=1/2π √(g/l)2πf=√(g/l)Given that ω=2πf where ω is angular frequency,ω=√(g/l)ω∝1/√l
Correct answer: 1/ √l- A. Gravity
- B. Simple harmonic
- C. Uniform
- D. Projectile
Explanation: One of the conditions for the back and forth motion to be classified as Simple Harmonic Motion is the acceleration being directly…
Correct answer: Simple harmonic- A. One fourth
- B. 3/4
- C. Half
- D. Double
Explanation: Explanation: T = 2π√m/kKeeping in mind the above relation, time period is directly proportional to the square root of mass.
Correct answer: Double- A. Extreme position
- B. Mean position
- C. Between extreme and mean position
- D. Beyond extreme position
Explanation: The correct answer is that the body is at the extreme position at t = T/4.
Correct answer: Extreme position- A. T = g cos θ
- B. T = mg sin θ
- C. T = mg cos θ
- D. T = mg
Explanation: The correct answer is C: T = mg cos θ. In a simple pendulum, the tension in the string must balance the component of the gravitational…
Correct answer: T = mg cos θ- A. 1/4
- B. 1/2
- C. √2
- D. 1/√2
Explanation: f = 1/2π × √(g/L)where 'g' is the acceleration due to gravity and 'L' is the length of the pendulum.When the length of the pendulum is…
Correct answer: 1/√2- A. Greater than natural frequency
- B. Unequal the natural frequency
- C. Less than natural frequency
- D. Equal to the natural frequency
Explanation: Resonance occurs when the driving frequency equals the natural frequency.
Correct answer: Equal to the natural frequency- A. T2=T1
- B. T2=2T1
- C. T2=√2T1
- D. T2=T1/(√2)
Explanation: Time period T for a mass attached to a spring can be calculated by using the following formula: T=2𝝅√m/k T1=2𝝅√m/k…
Correct answer: T2=√2T1- A. π
- B. π/2
- C. π/4
- D. -π
Explanation: Inside the sin bracket we need π/2 to get us a 1 in order to satisfy the condition which is x=x0.
Correct answer: π/2- A. Square root
- B. Square
- C. Third power
- D. Third root
Explanation: Speed of sound (v) in gas is directly proportional to square root of isothermal elasticity (K) i.e.
Correct answer: Square root1198. A standing wave pattern is formed when the length of string is an integral multiple of wavelength.
- A. Triple.
- B. Full.
- C. Half.
- D. Double.
Explanation: Standing or stationary waves are formed when the vibrating medium is made to vibrate giving rise to a waveform without displacing the…
Correct answer: Half.- A. Polarization
- B. Destructive interference.
- C. Constructive interference.
- D. Reflection.
Explanation: During constructive interference the path difference between the concave lens and the reflective surface i.e.
Correct answer: Destructive interference.- A. Interference.
- B. Polarization.
- C. Stationary waves.
- D. Beats.
Explanation: Two waves of slightly different frequencies travelling in the same direction produce beats.
Correct answer: Beats.