Back to WAVES

Your Progress

0 / 215 Answered

Correct

Incorrect

Accuracy

NEET • PHYSICS • WAVES

Waves practice · Mixed difficulty

Try a question, then open “View answer” to check it. Sign in to submit answers and save progress.

Practice format and chapter quiz

The practice player uses single-correct-answer MCQs. Chapter quizzes help you review a topic; they are not full-length NEET mock papers.

Take a chapter quiz →

Showing 1-30 of 215 questions

1 Medium

1 of 215

Application +4 | -1

1000\,\,Hz

sound wave in air strikes the surface of a lake and penetrates into water. If speed of sound in water is

1500\,\,\mathrm{m}{\mathrm{s}^{ - 1}}

, the frequency and wavelength of waves in water are

View answer and explanation

Correct option: B

1000\,\,\mathrm{ }Hz,\mathrm{ }1.5\,\,m

Option B (1000 Hz, 1.5 m) is correct because the frequency remains the same when a wave travels from one medium to another, and the wavelength changes according to the change in speed.

2 Medium

2 of 215

Understanding +4 | -1

The equation for spherical progressive wave is (where

r

is the distance from the source)

View answer and explanation

Correct option: D

y = \frac{a}{r}\,\,\sin \left( {\omega t - kx} \right)

Option D (

y = \frac{a}{r}\,\,\sin \left( {\omega t - kx} \right)

) is correct because the amplitude of a spherical wave decreases inversely with the distance from the source.

3 Medium

3 of 215

Application +4 | -1

One metre long tube, closed at both ends, is lying horizontally. A mercury column of length 0.1m is filled in its middle and in rest two parts air is filled at atmospheric pressure. When tube is turned to vertical position, then displacement of mercury will be (standard pressure = 0.76 m of Hg)

View answer and explanation

Correct option: C

0.029 m

Option C (0.029 m) is correct because it is calculated by applying Boyle's law to the air columns and considering the pressure difference due to the mercury column.

4 Medium

4 of 215

Understanding +4 | -1

A tuning fork produces waves in a medium. If the temperature of the medium changes, then which of the following will change

View answer and explanation

Correct option: C

Wavelength

Option C (Wavelength) is correct because the speed of sound changes with temperature, and since frequency remains constant, the wavelength must change.

5 Medium

5 of 215

Understanding +4 | -1

In a stationary wave all the particles

View answer and explanation

Correct option: B

In the region between two nodes vibrate in same phase

Option B (In the region between two nodes vibrate in same phase) is correct because in a stationary wave, particles between two consecutive nodes vibrate in the same phase, while particles in adjacent segments vibrate in opposite phases.

6 Easy

6 of 215

Application +4 | -1

A SONAR system fixed in a submarine operates at a frequency

40.0 \mathrm{kHz}

. An enemy submarine moves towards the SONAR with a speed of

360 \mathrm{~km} / \mathrm{h}

. What is the frequency of sound reflected by a submarine? Take the speed of sound in water to be

1450 \mathrm{~m} / \mathrm{s}

View answer and explanation

Correct option: A

45.93 \times {10^3}\,\,

Option A (

45.93 \times {10^3}\,\,

) is correct because it is the frequency calculated using the Doppler effect formula for both the submarine approaching and reflecting the sound.

7 Hard

7 of 215

Application +4 | -1

A train moving at a speed of

220\,\,m{s^{ - 1}}

towards a stationary object, emits a sound of frequency 1000 Hz. Some of the sound reaching the object gets reflected back to the train as echo. The frequency of the echo as detected by the driver of the train is {speed of sound in air is

330\,\,m{s^{ - 1}}

]

View answer and explanation

Correct option: C

5000 Hz

Option C (5000 Hz) is correct because it is the frequency of the echo detected by the train driver, calculated using the Doppler effect twice.

8 Medium

8 of 215

Analyzing +4 | -1

Two tuning forks

A

and

B

vibrating simultaneously produce

5

beats. Frequency of

B

512

. It is seen that if one arm of

A

is filled, then the number of beats increases. Frequency of

A

will be

View answer and explanation

Correct option: C

517

Option C (

517

) is correct because filing arm A increases its frequency, and since the beat frequency increases, the original frequency of A must have been higher than B.

9 Medium

9 of 215

Understanding +4 | -1

A uniform heavy string of mass M hangs vertically from a rigid ceiling. A transverse wave is sent from its free end towards fixed end. As the wave moves upward

View answer and explanation

Correct option: B

Its speed and wavelength increases

Option B (Its speed and wavelength increases) is correct because as the wave moves upward, the tension in the string increases, leading to an increase in both speed and wavelength.

10 Medium

10 of 215

Understanding +4 | -1

Doppler effect of sound depends on

View answer and explanation

Correct option: C

Relative velocity between source and listener

Option C (Relative velocity between source and listener) is correct because the Doppler effect is directly dependent on the relative velocity between the source and the observer.

11 Medium

11 of 215

Application +4 | -1

A cylindrical tube containing air is open at both ends. If the shortest length of the tube for resonance with a given fork is

20\,\,cm

, the next shortest length for resonance with the same fork will be

View answer and explanation

Correct option: B

40\mathrm{ }cm

Option B (

40\mathrm{ }cm

) is correct because the next shortest length for resonance in an open tube is twice the shortest length.

12 Medium

12 of 215

Application +4 | -1

The frequency of the sinusoidal wave

y = 0.40\,\,\,\cos \left[ {2000t + 0.80x} \right]

would be

View answer and explanation

Correct option: D

\frac{{1000}}{\pi }Hz

Option D (

\frac{{1000}}{\pi }Hz

) is correct because the frequency is calculated from the coefficient of time in the given sinusoidal wave equation.

13 Medium

13 of 215

Application +4 | -1

Three sources of equal intensities with frequencies

400,\,\,401\,\,\,and\,\,\,402\,\,vib/s

are sounded together. The number of beats/s is

View answer and explanation

Correct option: C

2

Option C (2) is correct because the number of beats is determined by the maximum difference between the frequencies.

14 Medium

14 of 215

Analyzing +4 | -1

Three successive resonance frequencies in an organ pipe are 1310,1834 and

2358 \mathrm{Hz}

. The frequency of

1^{\text {st }}

overtone (in

\mathrm{Hz}

) is (velocity of sound in air is

340 \mathrm{m} / \mathrm{s}

)

View answer and explanation

Correct option: B

786

Option B (786) is correct because the difference between successive resonance frequencies is constant in an organ pipe, allowing us to determine the fundamental frequency and then the first overtone.

15 Medium

15 of 215

Understanding +4 | -1

A sonometer wire is vibrating in the second overtone. In the wire there are

View answer and explanation

Correct option: C

Four nodes and three antinodes

Option D (Three nodes and three antinodes) is correct because the second overtone corresponds to the third harmonic, which has three antinodes and four nodes.

Explore Other Chapters in PHYSICS

View All →

UNITS & MEASUREMENTS 392 MCQs WORK-ENERGY-POWER 355 MCQs MECHANICAL PROPERTIES OF FLUIDS 317 MCQs MOTION IN PLANE 307 MCQs MAGNETIC EFFECT OF CURRENT 282 MCQs THERMAL PROPERTIES OF MATTER 269 MCQs

16 Easy

16 of 215

Application +4 | -1

If speed of sound in air is

330 \mathrm{~m} / \mathrm{s}

then find the number of tones present in an open organ pipe of length

1 \mathrm{~m}

whose frequency if

\leq 1000

View answer and explanation

Correct option: A

Option A (6) is correct because the number of tones can be found by calculating the harmonics that fall below 1000 Hz.

17 Hard

17 of 215

Analyzing +4 | -1

Equation of progressive wave is:

y=a \sin ^2 \frac{\pi}{4} \cos ^2 \frac{\pi}{4} \sin (\omega t-k x \pm \phi)

where symbols having their usual meanings then for given wave equation:

(a) Amplitude

=a \sin ^2 \frac{\pi}{4} \cos ^2 \frac{\pi}{4}

(b) Wavelength

=\frac{2 \pi}{{K}}

y=

unit of amplitude, unit of wavelength

=

unit of

x

(d) Frequency

=\frac{\omega}{2 \pi}

View answer and explanation

Correct option: C

a, b, c, d are correct

Option C (a, b, c, d are correct) is correct because all the statements about the amplitude, wavelength, units, and frequency are accurate based on the given wave equation.

18 Easy

18 of 215

Understanding +4 | -1

Statement I Waves on a string can be longitudinal in nature.

Statement II The string cannot be compressed or rarified.

View answer and explanation

Correct option: D

Statement I is false, Statement II is true

Option D is correct because waves on a string are transverse, and the string cannot be compressed or rarefied.

19 Medium

19 of 215

Remembering +4 | -1

The pitch of a sound wave is related to its

View answer and explanation

Correct option: A

Frequency

Option A (Frequency) is correct because the pitch of a sound wave is directly determined by its frequency.

20 Medium

20 of 215

Remembering +4 | -1

Which of the following is the longitudinal wave

View answer and explanation

Correct option: A

Sound waves

Option A (Sound waves) is correct because sound waves are characterized by the compression and rarefaction of the medium, making them longitudinal.

21 Medium

21 of 215

Analyzing +4 | -1

The wavelength of two notes in air are

\frac{{36}}{{195}}m

and

\frac{{36}}{{193}}m

each note produces

10

beats per second separately with a third note of fixed frequency. The velocity of sound in air in

m/s

View answer and explanation

Correct option: D

360

Option D (

360

) is correct because it is calculated by finding the frequencies from the wavelengths and then using the beat frequency to determine the velocity of sound.

22 Medium

22 of 215

Remembering +4 | -1

Of the following, the equation of plane progressive wave is

View answer and explanation

Correct option: B

y = r\,\,\sin \left( {\omega t - kx} \right)

Option B (

y = r\,\sin (\omega t - kx)

) is correct because it represents the general equation of a plane progressive wave.

23 Medium

23 of 215

Remembering +4 | -1

A device used for investigating the vibration of a fixed string of wire is

View answer and explanation

Correct option: A

Sonometer

Option A (Sonometer) is correct because a sonometer is specifically designed to investigate the vibration of a fixed string or wire.

24 Medium

24 of 215

Analyzing +4 | -1

Equations of a stationary wave and a travelling wave are

{y_1} = a\,\,\sin \,\,kx\,\,\cos \,\,\omega t

and

{y_2} = a\,\,\sin \left( {\omega t - kx} \right)

. The phase difference between two points

{x_1} = \frac{\pi }{{3k}}

and

{x_2} = \frac{{3\pi }}{{2k}}

are

{\phi _1}

and

{\phi _2}

respectively for the two waves. The ratio

{\phi _1}/{\phi _2}

View answer and explanation

Correct option: D

6/7

Option D (

6/7

) is correct because it represents the ratio of the phase differences calculated for the stationary and traveling waves at the given points.

25 Medium

25 of 215

Understanding +4 | -1

When we hear a sound, we can identify its source from

View answer and explanation

Correct option: D

Overtones present in the sound

Option D (Overtones present in the sound) is correct because the unique combination of overtones (harmonics) gives each sound source its characteristic timbre.

26 Easy

26 of 215

Understanding +4 | -1

Tube A has both ends open while tube B has one end closed, otherwise. They are identical the ratio of fundamental frequency of tube A and B is

View answer and explanation

Correct option: C

0.084027778

Option A (0.043055556) is incorrect. The correct ratio of fundamental frequencies is 2:1, so the ratio of A to B should be 2. The provided answer is not correct.

27 Easy

27 of 215

Application +4 | -1

What is the phase difference between two simple harmonic motions represented by

x_1=A \sin \left(\omega t+\frac{\pi}{6}\right) \text { and } x_2=A \cos \omega t \text { ? }

View answer and explanation

Correct option: B

\frac{\pi}{3}

Option B is correct because converting cosine to sine and finding the difference in phase angles gives pi/3.

28 Medium

28 of 215

Remembering +4 | -1

Maximum number of beats frequency heard by a human being is

View answer and explanation

Correct option: A

10

Option A (

10

) is correct because the maximum beat frequency a human can typically distinguish is around 10 Hz.

29 Easy

29 of 215

Understanding +4 | -1

The two waves of the same frequency moving in the same direction give rise to

View answer and explanation

Correct option: B

Interference

Option B (Interference) is correct because when two waves of the same frequency meet, they superpose to create interference.

30 Medium

30 of 215

Analyzing +4 | -1

Total number of independent harmonic waves in the resultant displacement equation given by

y=3 \sin ^2 \frac{t}{2} \sin 800 t

View answer and explanation

Correct option: A

Option A (3) is correct because the trigonometric identity transforms the equation into a sum of three harmonic waves with different frequencies.

Revision notes and key takeaways

Review WAVES in your textbook or class notes, then use this set to check your understanding.

Key Takeaways

✓ This set contains 215 single-correct-answer MCQs on WAVES.
✓ Try each question before opening its answer. Read the explanation where one is available.
✓ Sign in to save submitted answers. Revisit incorrect answers alongside your textbook or class notes.

Showing 1-30 of 215 questions

Continue Your Practice

📚 Switch Set (ALL)

Chapter Sets

ALL 215 MCQs EASY 36 MCQs HARD 15 MCQs MEDIUM 164 MCQs

0 /215

0✓ 0✗

0% Accuracy