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Class 11 Physics MCQ Questions of Waves with Answers?

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 The Class 11 Physics MCQ Questions of Wave with detailed solutions had been installation in keeping with the maximum current Syllabus, NCERT Books, and exam pattern advocated in Class 11 via way of means of CBSE. Students can start practice with MCQ Questions for class 11 Physics Wave with Answers for Board Exams.

We have lists here top multiple-choice questions and detailed solutions on waves in physics. These MCQ Questions overall help in numerous examinations like physics and Competitive exams for engineering. Professionals, Teachers, Students check your knowledge with the assist of  MCQ Questions for class 11.

Practice MCQ Questions for class 11 Physics Chapter-Wise

1. A resonance air column of length 40 cm resonates with a tuning fork of frequency 450 Hz. Ignoring end correction, the velocity of sound in air will be

(a) 720 m/s
(b) 820 m/s
(c) 920 m/s
(d) 1020 m/s

2. With the increase in temperature, the frequency of the sound from an organ pipe

(a) Decreases
(b) Increases
(c) Remain unchanged
(d) Changes erratically

3. Loudness of a note of sound is

(a) Directly proportional to amplitude of the wave
(b) Directly proportional to square of amplitude of wave
(c) Directly proportional to velocity of the wave
(d) Directly proportional to square of velocity of the wave

4. To demonstrate the phenomenon of beats we need

(a)Two sources which emit radiation of nearly the same frequency
(b) Two sources which emit radiation of exactly the same frequency
(c) Two sources which emit radiation of exactly the same frequency and have a definite phase relationship
(d) Two sources which emit radiation of exactly the same wavelength

5. Energy is not carried by

(a) Longitudinal progressive waves
(b) Electromagnetic waves
(c) Transverse progressive waves
(d) Stationary wave

6.  A resonating column of air contains

(a) Stationary longitudinal waves
(b) Stationary transverse waves
(c) Transverse progressive waves
(d) Longitudinal progressive waves

7. When a compression is incident on rigid wall it is reflected as

(a) Compression with a phase change of p
(b) Compression with no phase change
(c) Rarefaction with a phase change of p
(d) Rarefaction with no phase change

8. When a sound wave goes from one medium to another, the quantity that remains unchanged is

(a) frequency
(b) wavelength
(c) amplitude
(d) speed

9. Sound travels in rocks in the form of

(a) both longitudinal and transverse elastic waves
(b) non-elastic waves
(c) transverse elastic waves only
(d) longitudinal elastic waves only

10. The property of a medium necessary for wave propagation is

(a) All of the above
(b) Elasticity
(c) Inertia
(d) Low resistance

11. The ratio of the speed of a body to the speed of sound is called

(a) Mach number
(b) Sonic index
(c) Doppler ratio
(d) Refractive index.

12. Sound waves transfer

(a) both energy and momentum
(b) only energy not momentum
(c) momentum
(d) energy

13. Statement 1: The base of Laplace correction was that exchange of heat between the region of compression and rarefraction  in air is negligible

Statement 2: Air is bad conductor of heat and velocity of sound in air is quite large

(a) Statement-1 is false, Statement -2 is true
(b) Statement-1 is true, Statement-2 is true; Statement-2 is a correct explanation for Statement-1
(c) Statement-1 is true, Statement-2 is true; Statement-2 is not a correct explanation for statement-1
(d) Statement-1 is true, Statement-2 is false

14. Which of the following changes at an antinode in a stationary wave?

(a) Neither pressure nor density
(b) Both pressure and density
(c) Pressure only
(d) Density only

15. What is the effect of humidity on sound waves when humidity increases?

(a) Speed of sound waves is more
(b) Speed of sound waves is less
(c) Speed of sound waves remains same
(d) Speed of sound waves becomes zero

16. Closed organ pipe (closed at one end) is excited to support the third overtone. It is found that air in the pipe has

(a) four nodes and four antinodes
(b) four nodes and three antinodes
(c) three nodes and four antinodes
(d) three nodes and three antinodes

17. If there are six loops for 1 m length in transverse mode of Melde’s experiment., the no. of loops in longitudinal mode under otherwise identical conditions would be

(a) 3
(b) 6
(c) 12
(d) 8

18. The Doppler effect is applicable for

(a) Light waves only
(b) Sound waves only
(c) Both light and sound waves
(d) None of the above

19.  A man sitting in a moving train hears the whistle of the engine. The frequency of the whistle is 600 Hz:

(a) the apparent frequency as heard by him is smaller than 600 Hz
(b) the apparent frequency if larger than 600 Hz
(c) the frequency as heard by him is 600 Hz
(d) None of the above

20. If source and observer both are relatively at rest and if speed of sound is increased then frequency heard by observer will :

(a) Increases
(b) Decreases
(c) Can not be predicted
(d) Will not change

21. A source emits a sound of frequency of 400 Hz, but the listener hears it to be 390 Hz. Then 

(a) The listener is moving towards the source
(b) The source is moving towards the listener
(c) Can not be predicted
(d) Will not change

22. Quality of a musical note depends on :

(a) Harmonics present
(b) The amplitude of the wave
(c) Fundamental frequency
(d) The velocity of sound in the medium

23. Of the following the one which emits the sound of a higher pitch is :

(a) Mosquito
(b) Lion
(c) Man
(d) Woman

24. Two waves having sinusoidal waveforms have different wavelengths and different amplitudes. They will be having :

(a) Same pitch and different intensity
(b) Same quality and different intensity
(c) Different quality and different intensity
(d)  Same quality and different pitch

25. In a stationary wave along a string, the strain is :

(a) zero at the antinodes
(b) maximum at the antinodes
(c) zero at the nodes
(d) maximum at the nodes

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Answer:

1. Answer: (a) 720 m/s

Explanation: Here : Length of column = 40cm =0.4m

Frequency of tuning fork = 450Hz

Using the formula n= v/4l

or v =450 × 4 × 0.4v

= 720m/s

2. Answer: (b) Increases

Explanation: Frequency ∝ v/L. Now v and L both increase with temperature but increase of v is much more than the increase of L which  is negligible . Thus frequency increases with temperature.

3. Answer: (a) Directly proportional to amplitude of the wave

Explanation: The loudness of a sound wave is determined from its amplitude. While loudness is only associated with sound waves, all types of waves have an amplitude. Waves on a calm ocean may be less than 1 foot high.

4. Answer: (a)Two sources which emit radiation of nearly the same frequency 

Explanation: To demonstrate the phenomena of interference, we require two sources which emit radiation of the same frequency and have a definite phase relationship.  

5. Answer: (d) Stationary wave

Explanation: The stationary or standing wave is a superposition of two waves of equal amplitude and frequency moving in opposite direction to each other and so there is no movement of the particles of the medium. That’s why there is no transfer of energy in the case of standing waves.

6. Answer: (a) Stationary longitudinal waves

Explanation: In a resonating air column, longitudinal standing waves are formed. A standing wave is formed when two waves of same amplitude and same frequency, moving with same speed but opposite in direction interfere. A standing wave does not propagate in any direction and it oscillates at one place.

7. Answer: (a) Compression with a phase change of p

Explanation: Therefore, a compression which is travelling towards the wall is reflected as a compression in the direction opposite to the wall and a rarefaction incident on the wall is reflected as a rarefaction.

8. Answer: (a) frequency

Explanation: The physical quantity that remain unchanged when a sound wave goes from one medium to another is frequency.

9. Answer: (a) both longitudinal and transverse elastic waves

Explanation: Sound travels in rocks in the form of both longitudinal and transverse waves, but in air, sound travels only in the form of longitudinal waves'.

10. Answer: (a) All of the above

Explanation: The properties of a medium necessary for wave propagation are its elasticity, low resistance and inertia. 

11. Answer: (a) Mach number

Explanation: Mach number is defined as the ratio of speed of a body to the speed of sound in air.

12. Answer: (a) both energy and momentum

Explanation: Sound waves transfer both energy and momentum.

13. Answer: (c) Statement-1 is true, Statement-2 is true; Statement-2 is not a correct explanation for statement-1

Explanation: Laplace corrected Sir Newton's formula for velocity of sound in a gas , by saying that ,when sound wave propagates  in a gas , change in pressure and volume in compressions and rarefactions is not an isothermal change but an adiabatic change , and we know that in an adiabatic change there is no exchange of heat between gas and surrounding ( air) , therefore statement -1 is true . On the other hand velocity of sound in a gas (or air) is not related with the conductivity of gas as by the relation given by Laplace .

14. Answer: (a) Neither pressure nor density

Explanation: Pressure and density do not change at an anti-node in a stationary wave.
Only amplitude changes.

15. Answer: (a) Speed of sound waves is more

Explanation: Humidity affects the sound waves. Since Humidity contains more water vapour the medium becomes denser. Consequently the sound would travel faster, means frequency increases.

16. Answer: (b) four nodes and three antinodes

Explanation: It is known that when closed pipe vibrates in fundamental mode, there are one node and one antinode. When it vibrates in first overtone, there are two nodes and two antinodes. When it vibrates in second overtone, there are three nodes and three antinodes. When it vibrates in third overtone, there are four nodes and four antinodes.

17. Answer: (a) 3

Explanation: One cycle of up and down vibration for transverse waves on the string is two cycles of string tension increase and decrease. The tension is maximum both at the loops’ maximum up position and again at maximum down position. Therefore, in longitudinal drive mode, since the string tension increases and decreases once per tuning fork vibration, it takes one tuning fork vibration to move the string loop to maximum up position and one to move it to maximum down position. This is two tuning fork vibrations for one up and down string vibration, so the tuning fork frequency is half the string frequency. Hence, the number of loops in longitudinal mode(tuning fork) is half of that of transverse mode(string).

18. Answer: (c) Both light and sound waves  

Explanation: The Doppler effect occurs when the motion of wave source and observer is relative. As we know light and sound, both are waves. Thus Dopler effect is applicable to both sound and light waves.

19. Answer: (c) the frequency as heard by him is 600 Hz

Explanation: Since there is no no relative motion between the listener and source, hence actual frequency will be heard by listener.

20. Answer: (d) Will not change

Explanation: The apparent change in the frequency of the source due to a relative motion between the source and observer is known as Doppler's effect. In the given case there is no relative motion between source and observer, since both are at rest, hence frequency of sound heard by the observer will remain unchanged.

21. Answer: (a) The listener is moving towards the source

Explanation: Since apparent frequency is lesser than the actual frequency, hence the relative separation between source and listener should be increasing.

22. Answer: (a) Harmonics present

Explanation: The quality of sound depends upon the number of harmonics present. Due to different number of harmonics present in two sounds, the shape of the resultant wave is also different.

23. Answer: (a) Mosquito

Explanation: Pitch of mosquito is higher among all given options.

24. Answer: (c) Different quality and different intensity

Explanation: The pitch depends upon the frequency of the source. As the two waves have different amplitude, therefore, they having different intensity. while quality depends on a number of harmonics/overtone produced and their relative intensity. Assuming that their frequencies are the same.

25. Answer: (d) maximum at the nodes

Explanation: In a stationary wave strain is maximum at the node because two opposite forces act at the node. 

Click here to practice MCQ Questions for Waves class 11

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