Wave Mechanics MCQ. We covered all the Wave Mechanics MCQ in this post for free so that you can practice well for the exam.
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MCQ on Wave Mechanics for NEET Students
A wire having a tension of 256 N produces six beats per second when it is tuned with a fork. When tension changes to 225 N, it is tuned with the same fork, and the number of beats remains unchanged. The frequency of the fork will be
(A) 186 Hz
(B) 225 Hz
(C) 256 Hz
(D) 280 Hz
Option a – 186 Hz
At which temperature will the speed of sound in hydrogen be the same as that of the speed of sound in oxygen at 90 °C?
(A) -148 °C
(B) -212.5 °C
(C) -271.5 °C
(D) -250.3 °C
Option d – -250.3 °C
The amplitude of the sound is doubled and the frequency is reduced to one-fourth. The intensity of sound at the same point will be
(A) increased to double.
(B) increased to four times.
(C) decreased to half.
(D) decreased to one-fourth.
Option d – decreased to one-fourth.
When an engine passes near a stationary observer, then its apparent frequencies occur in the ratio of 5/3. The speed of the engine is
(A) 540 m/s
(B) 270 m/s
(C) 85 m/s
(D) 52.5 m/s
Option c – 85 m/s
If a longitudinal wave is reflected from a rarer medium, then
(A) compression is reflected as a compression.
(B) wave velocity does not reverse.
(C) particle velocity undergoes a phase reversal.
(D) compression is reflected as a rarefaction.
Option d – compression is reflected as a rarefaction.
When a wave undergoes a reflection, phase reversal of it means there is
(A) reversal of particle as well as wave velocity.
(B) reversal of particle velocity.
(C) reversal of wave velocity.
(D) no change in particle velocity.
Option b – reversal of particle velocity.
If you set up the fifth harmonic on a string fixed at both ends, how many nodes and antinodes are set up in it respectively?
(A) 6,5
(B) 6,6
(C) 6,7
(D) 5,5
Option a – 6,5
In transverse waves, particles of the medium vibrate
(A) perpendicular to the direction of propagation of the wave.
(B) at 30° with the direction of propagation of waves.
(C) parallel to the direction of propagation of waves.
(D) at 45° with the direction of propagation of waves.
Option a – perpendicular to the direction of propagation of the wave.
In a sinusoidal wave, the time required by a particular particle to move from maximum displacement to zero displacements is 0.03 sec. The frequency of the wave is
(A) 2.5 Hz
(B) 4.16 Hz
(C) 7.5 Hz
(D) 8.33 Hz
Option d – 8.33 Hz
If a, b, and c are constant, then which of the following functions represents a traveling wave?
(A) y = a cos bx sin ct
(B) y = a sin bx cos ct
(C) y = a sin (bx + ct) – a sin (bx – ct)
(D) y = a sin (bx + ct)
Option d – y = a sin (bx + ct)
A traveling wave propagating along the +ve x-direction is represented by the equation y = 0.5 sin (10t – 2x) m. What is the velocity of the wave?
(A) 10 m/s
(B) 5 m/s
(C) 20 m/s
(D) 15 m/s
Option b – 5 m/s
Which of the following statements is CORRECT? The frequency of a vibrating string is
(A) directly proportional to the length of the string.
(B) inversely proportional to its diameter.
(C) inversely proportional to the tension.
(D) directly proportional to the density.
Option b – inversely proportional to its diameter.
Vibrating strings of sitar will produce beats if
(A) there is a slight difference in their lengths.
(B) they produce vibrations of slightly different wavelengths.
(C) their amplitudes are slightly different.
(D) their frequencies are the same.
Option b – they produce vibrations of slightly different wavelengths.
When a wave travels in a medium the particle displacements are given by. y (x, t) = 0.05 sin π (2t – 0.01 x), where y and x are in metre and t is in seconds. The wavelength of the wave is
(A) 10 m
(B) 20 m
(C) 100 m
(D) 200 m
Option d – 200 m
A pipe open at both ends gives frequencies, which are
(A) only odd multiples of the fundamental frequency.
(B) only even multiples of the fundamental frequency.
(C) all integral multiples of the fundamental frequency.
(D) all fractional multiples of the fundamental frequency.
Option c – all integral multiples of the fundamental frequency.
Two closed organ pipes when sounded simultaneous gave 6 beats per second. If the longer pipe has a length of 1 m, then the length of the shorter pipe will be (v = 300 m/s)
(A) 185.2 cm
(B) 92.6 cm
(C) 90 cm
(D) 80 cm
Option b – 92.6 cm
If helium has a density of 0.179 kg/m³ at S.T.P.. then considering helium gas as an ideal gas, the speed of sound waves in helium is nearly
(A) 752 m/s
(B) 1030 m/s
(C) 972 m/s
(D) 810 m/s
Option a – 752 m/s
Two open organ pipes of length 25 cm and 25.5 cm produce 15 beats/s. The velocity of sound will be
(A) 382.5 m/s
(B) 350 m/s
(C) 205 m/s
(D) 300 m/s
Option a – 382.5 m/s
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