Free Waves MCQs with Answers

• A. 16 sec
• B. 12 sec
• C. 8 sec
• D. 4 sec

Explanation: The formula for the period of a simple pendulum is T = 2π √(l/g). The period is directly proportional to the square root of the length.

• A. Zero
• B. ±A/2
• C. ±A/√2
• D. 2A

Explanation: When the potential energy is equal to the kinetic energy, we have:(1/2)kx^2 = (1/2)mv^2x^2 = (mv^2)/kv^2 = kx^2/mSubstituting v^2 into the…

• A. 1/8
• B. 1/2
• C. 1/4
• D. 3/4

Explanation: Correct option is D)In case of SHMKE= 1/2 mω^2 (a ^2 −x ^2 ) and at x=a/2KE= 1/2 mω ^2 [a^2 −(a/2)^2 ]= 3/4 [ 1/2 mω^2 ^ 2 ]Total energy =…

• A. 1 Hz
• B. 2 Hz
• C. 5Hz
• D. None of the above.

Explanation: A seconds pendulum has time period of 2 seconds and frequency of 0.5 Hz

• A. Velocity is zero
• B. Displacement is zero
• C. Both velocity and displacement are zero
• D. Both velocity and displacement are maximum

Explanation: As we know; a ∝-x Where a=acceleration x=displacement As long as the pendulum in harmonic motion is moving, it covers a displacement and…

• A. Mean position
• B. Extreme position
• C. Midpoint of mean and extreme position
• D. None of the above

Explanation: In simple harmonic motion, the restoring force is the force that brings an oscillating object back towards its equilibrium position.

• A. 3.40m
• B. 2.94m
• C. 0.340m
• D. 0.294m

Explanation: According to the v=fλ v= 340m/s f= 1 x 103 Hz Hence λ= v/f = 340 / 1x103= 0.34 m (option C is the correct option)

• A. 330m
• B. 100m
• C. 10m
• D. 1m

Explanation: Therefore, the correct option is "1m" as it represents a reasonable wavelength for audible sound produced by a tuning fork of frequency…

• A. decreases
• B. increases
• C. does not change
• D. sometime decreases, some time increases

Explanation: Speed of sound does not depend on pressure of gas.

• A. 1 : 1
• B. 4 : 1
• C. 1 : 4
• D. 3 : 1

Explanation: Air pressure has almost no effect on sound speed. It has no effect at all in an ideal gas approximation, because pressure and density both…

• A. Increasing
• B. Decreasing
• C. Same
• D. Different

Explanation: The radius(distance between observer and source) of the circle is the same at every point of the circumference.

• A. 150 s-1
• B. 300 s-1
• C. 600s-1
• D. None

Explanation: The speed of sound in air at NTP is a constant value i.e 300 ms-1 (it does not change) The speed of sound in a gas is independent of its…

• A. As longitudinal
• B. Adiabatically
• C. Isothermally
• D. Under isobaric conditions

Explanation: The transfer of energy is in the form of work done, during sound propagation so it is an adiabatic process

• A. 10 sec
• B. 1000 sec
• C. 1 day
• D. None of the above

Explanation: When a bomb explodes on the moon- due to the vacuum there is no medium for the propagation of sound and hence it cannot reach the earth

• A. 332 m/s
• B. 315 m/s
• C. 340 m/s
• D. 300 m/s

Explanation: When the wind is blowing in the opposite direction to the sound, it can affect the speed at which the sound waves reach the listener.

• A. f = ½ √T/ml
• B. f = 1/2l √T/m
• C. f = 1/2l√T/m
• D. f = 1/2√T/m

Explanation: The fundamental frequency of a string stretched by tension T, with mass m and length l, is given by the formula f = 1/2l √T/m.

• A. Electromagnetic waves
• B. Microwaves
• C. Stationary waves
• D. Sound waves

Explanation: When two waves of the same frequency and amplitude moving with the same speed in the opposite direction along the same path, these types…

• A. f = 1⁄2 √T/ml
• B. f = 1/2l√lT/m = 1/2l √lT/m
• C. f = 1/2l√T/m
• D. f = 1/2√T/m

Explanation: Frequency is directly proportional to tension and inversely with mass . Formula from SHM.

• A. velocity of waves
• B. wavelength of waves
• C. nature of the medium
• D. frequency of waves

Explanation: No. of loops in stationary waves depend on frequency of waves.

• A. Crest
• B. Anti-node
• C. Node
• D. Trough

Explanation: A node is a point along a standing wave where the wave has minimum amplitude. All the particles of the string execute SHM except nodes.