Free Waves MCQs with Answers

• A. Decreases
• B. Increases
• C. Remains the same
• D. May increase or decrease:

Explanation: When two identical waves overlap, they interfere constructively or destructively, depending on their phase relationship.

• A. 3×10^8 m/s
• B. 350 m/s
• C. 500 m/s
• D. 0 m/s

Explanation: Sound requires a medium to travel. In a vacuum, there is no medium, so sound cannot propagate.

• A. Energy, momentum, and mass
• B. Energy
• C. Energy and mass
• D. Energy and momentum

Explanation: When a longitudinal wave propagates through a material medium, the quantities transmitted in the direction of propagation are energy and…

• A. 2L
• B. 4L
• C. L
• D. L/2

Explanation: In a closed organ pipe, the fundamental frequency corresponds to the length of the pipe, which is equal to half the wavelength of the…

• A. 61 m/s
• B. 0.61 m/s
• C. 61 cm/s
• D. Both (b) and (c)

Explanation: Correct Option: (d) Both (b) and (c),The increase in velocity of sound in air for a 1°C rise in temperature is approximately 0.61 m/s or…

• A. Monoatomic gas
• B. Diatomic gas
• C. Triatomic gas
• D. Polyatomic gas

Explanation: Monoatomic gases have the highest speed of sound under identical conditions of pressure and density.

• A. Isothermal proces
• B. Adiabatic process
• C. Isobaric process
• D. Isochoric process

Explanation: The propagation of sound through air is an adiabatic process because sound waves travel through air with minimal exchange of heat with the…

• A. Elasticity
• B. Density
• C. Temperature
• D. All

Explanation: The speed of sound is greater in solid materials compared to gases due to their high elasticity.

• A. Mgr + mgr
• B. Mgr - mgr
• C. 2gr(M+m)
• D. 2gr(M-m)

Explanation: Mg is applied in downwards direction and mg is applied upward, but the torque they create is in the same direction, so total torque is sum…

• A. 2n/l
• B. 2l/n
• C. l/n
• D. n/2

Explanation: The wavelength (λ) of the stationary waves on a string fixed at both ends is given by λ(n)=2l/n , where n is the mode of vibration…

• A. Pressure
• B. Temperature
• C. Density
• D. Humidity

Explanation: The speed of sound is primarily dependent on the properties of the medium through which it travels, such as temperature and density.

• A. Gas
• B. Liquid
• C. Solid
• D. All

Explanation: Solids are the only medium among the options that can propagate both transverse and longitudinal waves.

• A. 50Hz
• B. 350 Hz50Hz
• C. 175Hz
• D. 500Hz

Explanation: The fundamental frequency (f) of a closed-end organ pipe is given by the formula f=v2l , where v is the speed of sound and L is the length…

• A. f,3f,5f,...
• B. 2f,3f,4f,
• C. 3f,5f,7f,...
• D. f,2f,3f,...

Explanation: A closed-end organ pipe produces overtones that are integer multiples of the fundamental frequency (f).

• A. Increases
• B. Decreases
• C. Remains the same
• D. A may increase or decrease

Explanation: In a stationary wave, the number of loops is directly related to the harmonic or mode of vibration.

• A. Resonance
• B. Polarization
• C. Destructive interference
• D. Constructive interference

Explanation: A silence zone occurs due to destructive interference, where waves of equal amplitude and frequency meet out of phase, canceling each…

• A. Jm-2 s-2
• B. Jm-1 s-1
• C. Wm-2
• D. Jm-2

Explanation: The intensity of a wave is a measure of the energy transported by the wave per unit of time and per unit of area.

• A. Velocity
• B. Wavelength
• C. Frequency
• D. All of these

Explanation: When waves travel from one medium to another, their frequency remains constant, regardless of the change in the velocity and wavelength…

• A. Same
• B. Less
• C. Greater
• D. Either (b) or (c)

Explanation: When the source of sound is moving towards the observer, the perceived frequency is higher (greater).

• A. v is directly proportional to P^−1
• B. v is directly proportional to P^1/2
• C. v is directly proportional to P^−1/2
• D. v is directly proportional to P0

Explanation: The speed of sound in air is directly proportional to the square root of atmospheric pressure.