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JEE • PHYSICS • WAVES

Waves practice · Easy

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Practice format and chapter quiz

These sets use single-correct-answer MCQs. They do not cover every JEE Main or JEE Advanced question format and are not full-length mock papers.

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1 Easy

1 of 13

Understanding +4 | -1

A plane progressive wave is given by

y=2 \cos 2 \pi(330 t-x)m.

The frequency of the wave is:

View answer and explanation

Correct option: B

330 \mathrm{~Hz}

Option B (

330 \mathrm{~Hz}

) is correct because by comparing the given equation with the standard wave equation, the frequency can be directly determined.

2 Easy

2 of 13

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 a string cannot be compressed or rarefied.

3 Easy

3 of 13

Remembering +4 | -1

‘SONAR’ emits which of the following waves

View answer and explanation

Correct option: B

Ultrasonic waves

Option D (Ultrasonic waves) is correct because SONAR emits ultrasonic waves.

4 Easy

4 of 13

Understanding +4 | -1

The engineer of a train blows the train whistle as he approaches a crossing. A few moments later he hears a echo from the whistle. The engineer hears the echo of the whistle because of:

View answer and explanation

Correct option: A

Reflection

Option A (Reflection) is correct because an echo is formed due to the reflection of sound waves.

5 Easy

5 of 13

Analyzing +4 | -1

If fundamental frequency is 50 and next successive frequencies are 150 and 250 then it is

View answer and explanation

Correct option: B

A pipe closed at one end

Option B (A pipe closed at one end) is correct because the given frequencies (50, 150, 250) are odd multiples of the fundamental frequency, which is characteristic of a pipe closed at one end.

6 Easy

6 of 13

Analyzing +4 | -1

A closed organ pipe and an open organ pipe of the same length produce four beats, when sounded together. If the length of the closed organ pipe is increased then the number of beats will

View answer and explanation

Correct option: B

Increase

Option B (Increase) is correct because increasing the length of the closed pipe decreases its frequency, thus increasing the beat frequency with the open pipe.

7 Easy

7 of 13

Application +4 | -1

Pulse rate of a normal person is 75 per minute. The time period of heart is [in seconds]

View answer and explanation

Correct option: A

0.8

Option A (0.8) is correct because the time period is the inverse of the frequency, which is calculated from the pulse rate.

8 Easy

8 of 13

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 C (02:01) is correct because the fundamental frequency of an open tube is twice that of a closed tube of the same length.

9 Easy

9 of 13

Understanding +4 | -1

To decrease the fundamental frequency of a stretched string fixed at both ends. Which of the following option is correct?

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Correct option: C

Increase its length

Option C (Increase its length) is correct because the fundamental frequency is inversely proportional to the length of the string.

10 Easy

10 of 13

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 the superposition of two waves of the same frequency moving in the same direction results in interference.

11 Easy

11 of 13

Application +4 | -1

A resonance air column of length

20 \mathrm{~cm}

resonates with a tuning fork of frequency

450 \mathrm{~Hz}

. Ignoring the correction, the velocity of sound in air will be

View answer and explanation

Correct option: D

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

Option D (360 m/s) is correct because the velocity of sound is calculated using the formula v = fλ, where λ = 4l for a closed pipe.

12 Easy

12 of 13

Understanding +4 | -1

What is your observation when two sources are emitting sound with frequency

499 \mathrm{~Hz}

and

501 \mathrm{~Hz}

View answer and explanation

Correct option: A

Frequency of

500 \mathrm{~Hz}

is heard with change in intensity take place twice

Option A is correct because the frequency heard is the average of the two frequencies, and the change in intensity (beats) occurs twice per second due to the 2 Hz difference.

13 Easy

13 of 13

Understanding +4 | -1

The sound carried by air from a sitar to a listener is a wave of the following type

View answer and explanation

Correct option: D

Longitudinal progressive

Option D (Longitudinal progressive) is correct because sound waves are longitudinal, and they propagate outwards from the source.

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 13 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.

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