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. Option A
- B. Option B
- C. Option C
- D. Option D
Explanation: The K.E of an oscillating body is maximum at the equilibirum position because speed is maximum at that point, and is 0 at the extreme…
Correct answer: Option A- A. Energy ; dissipated
- B. Energy ; generated
- C. Energy ; conserved
- D. Energy ; stored
Explanation: In undamped motion, energy remains constant since there is no work done against the damping force.
Correct answer: Energy ; dissipated- A. Variable
- B. Infinity
- C. Constant
- D. Zero
Explanation: During the oscillations, the total energy is constant and equal to the sum of the potential energy and the kinetic energy of the system…
Correct answer: Constant- A. A restoring force
- B. Its weight
- C. Centripetal force
- D. Force of friction
Explanation: An object in such motion oscillates about an equilibrium position due to a restoring force or torque.
Correct answer: A restoring force- A. 76 Hz
- B. 176 Hz
- C. 50 Hz
- D. 150 Hz
Explanation: Tension acting on the wire is T = 80 N, length of wire from the fixed point to the weight is L = 1.5 m.
Correct answer: 76 Hz- A. 16 J
- B. 4J
- C. 32 J
- D. 24 J
Explanation: Work done is found using the formula = ½ x k x [(x2)^2 - (x1)^2]= ½ x 400 x [(0.15)^2 - (0.05)^2]= 4 J
Correct answer: 4J- A. 3√2
- B. 1√2
- C. 2√2
- D. √2
Explanation: The formula for time period is: T = 2π x √L/gUsing this formula, we see that doubling length results in multiplying time period with √2.
Correct answer: √2- A. Inversely proportional
- B. Directly proportional
- C. Acting positive
- D. Independent
Explanation: Option B is correct because in a simple pendulum, the acceleration is directly proportional to the displacement from the equilibrium…
Correct answer: Directly proportional- A. Maximum kinetic energy of the mass
- B. Average speed of the mass
- C. Total energy of the mass
- D. Angular frequency of the oscillation
Explanation: The angular frequency refers to the angular displacement per unit time and is calculated from the frequency with the equation ω=2πf.The…
Correct answer: Angular frequency of the oscillation- A. 1/2π rad/s
- B. 120π rad/s
- C. 30/π rad/s
- D. 2π rad/s
Explanation: Angular velocity is denoted by ω.As given,ω = 60 rev/min1 rev = 2π rad, and 1 min = 60 s.
Correct answer: 2π rad/s- A. Time period = T/2 total energy = E/4
- B. Time period = no change total energy = E/4
- C. Time period= T/2 total energy = E/2
- D. Time period= T total energy= E/2
Explanation: The time period does not depend on the amplitude but only on frequency.
Correct answer: Time period = no change total energy = E/4- A. The speed of the body always increases
- B. The body moves at constant speed
- C. The body always slows down
- D. The body accelerates
Explanation: Correct option is D.Under action of restoring force the body start accelerating.The restoring force is directly proportional to the…
Correct answer: The body accelerates293. Calculate the frequency if the number of revolutions is 300 per second and the paired poles are 50.
- A. 15 kHz
- B. 150 kHz
- C. 1500 kHz
- D. 150 Hz
Explanation: Correct option is A.We know thatF = p × nF = 50 × 300F = 1500 Hz = 15 kHzAs this is a numerical thus only one option is correct.
Correct answer: 15 kHz- A. Half
- B. Maximum
- C. Minimum
- D. 75%
Explanation: The potential energy at the mean position of a simple pendulum is minimum i.e. zero.
Correct answer: Minimum- A. The string vibrates with more energy
- B. The sound is concentrated over smaller area
- C. The speed of sound is greater in board
- D. The energy leaves the board at a greater rate
Explanation: The correct answer is (b) The sound is concentrated over a smaller area.
Correct answer: The sound is concentrated over smaller area- A. Nature of displacement = antinode change in frequency = decrease
- B. Nature of displacement = antinode change in frequency = increase
- C. Nature of displacement = node change in frequency = increase
- D. Nature of displacement = node change in frequency = decrease
Explanation: Since the cylinder is half-filled with water, we can treat this as a pipe where it is closed on one end and open on the other.
Correct answer: Nature of displacement = node change in frequency = increase- A. When acceleration is directly proportional to -x
- B. When acceleration is directly proportional to x
- C. When acceleration is directly proportional to v
- D. When acceleration is inversely proportional to -x
Explanation: Simple harmonic motion (SHM) is a type of oscillatory motion in which the acceleration of the system is directly proportional to the…
Correct answer: When acceleration is directly proportional to -x- A. v2 = F/m
- B. v = F/m
- C. v x m = F
- D. v = F x m
Explanation: Option A) This is a standard formula. The speed v of the waves in the string depends upon the tension, F, of the string and m, the mass…
Correct answer: v2 = F/m- A. 0
- B. π/2
- C. π
- D. 3π/2
Explanation: In a pendulum undergoing simple harmonic motion (SHM), the displacement and the acceleration of the particle are 90 degrees out of phase.
Correct answer: π- A. 2π xo/ao
- B. 2π ao/xo
- C. 2π xoao
- D. 2π / xoao
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: 2π xo/ao