# Waves MCQ Questions for Class 11 Physics Chapter 15 with Answers

NCERTCOURSE.COM given here the NCERT chapter-wise Multiple Choice Questions from Class 11 Physics book Chapter 15 Waves with Answers Pdf free download. This may assist you to understand and check your knowledge about the chapters. Students also can take a free test of the Multiple Choice Questions of Waves. Each question has four options followed by the right answer. These MCQ Questions are selected supported by the newest exam pattern as announced by CBSE.

(i) amplitude
(ii) frequency
(iii) intensity
(iv) wavelength

(iv) wavelength

## Q2. In the longitudinal waves the direction of vibration in medium of particle is

(i) Perpendicular to propagation of wave
(ii) Parallel to propagation
(iii) Different from each other
(iv) Variable for time to time

(ii) Parallel to propagation

## Q3. Energy is not carried by

(i) Longitudinal progressive waves
(ii) Electromagnetic waves
(iii) Transverse progressive waves
(iv) Stationary wave

(iv) Stationary wave

(i) frequency
(ii) wavelength
(iii) amplitude
(iv) speed

(i) frequency

## Q5. With the propagation of longitudinal wave through a material medium, the quantities transmitted in the propagation direction are :

(i) energy.
(ii) energy and linear momentum.
(iii) energy and mass.
(iv) energy, mass and momentum.

(i) energy.

## Q6. The wavelength of sound in air is 10 cm. its frequency is, (Given velocity of sound = 330 m/s)

(i) 330 cycles per second
(ii) 3.3 kilo cycles per second
(iii) 30 mega-cycles per second
(iv) 305 cycles per second

(ii) 3.3 kilo cycles per second

## Q7. The frequency of the note produced by plucking a given string increases as

(i) The length of the string increases
(ii) The tension in the string increases
(iii) The tension in the string decreases
(iv) The mass per unit length of the string increases

(ii) The tension in the string increases

## Q8. Sound travels in rocks in the form of

(i) both longitudinal and transverse elastic waves
(ii) non-elastic waves
(iii) transverse elastic waves only
(iv) longitudinal elastic waves only

(i) both longitudinal and transverse elastic waves

## Q9. The velocity of sound in any gas depends upon

(i) wavelength of sound only.
(ii) amplitude and frequency of sound.
(iii) density and elasticity of the gas.
(iv) intensity of sound waves only.

(iii) density and elasticity of the gas.

(i) 2 sec
(ii) 0.5 sec
(iii) 250 sec
(iv) 252 sec

(ii) 0.5 sec

## Q11. With the increase in temperature, the frequency of the sound from an organ pipe

(i) Decreases
(ii) Increases
(iii) Remain unchanged
(iv) Changes erratically

(ii) Increases

## Q12. The ratio of the speed of a body to the speed of sound is called

(i) Mach number
(ii) Sonic index
(iii) Doppler ratio
(iv) Refractive index

(i) Mach number

## Q13. The velocity of sound in a gas is proportional to :

(i) the isothermal elasticity.
(iii) square root of the isothermal elasticity.
(iv) square root of the adiabatic elasticity.

(iv) square root of the adiabatic elasticity.

## Q14. Which of the following expressions is that of a simple harmonic progressive wave

(i) a sin wt
(ii) a sin (wt) cos (kx)
(iii) a sin (wt – kx)
(iv) a cos kx

(iii) a sin (wt – kx)

(i) 720 m/s
(ii) 820 m/s
(iii) 920 m/s
(iv) 1020 m/s

(i) 720 m/s

## Q16. Which of the following changes at an antinode in a stationary wave?

(i) Neither pressure nor density
(ii) Both pressure and density
(iii) Pressure only
(iv) Density only

(i) Neither pressure nor density

## Q17. What types of waves are produced in the sonometer wire?

(i) Transverse and stationary.
(ii) Transverse and progressive.
(iii) Longitudinal and progressive.
(iv) Longitudinal and stationary.

(i) Transverse and stationary.

## Q18. In stationary waves

(i) Energy is uniformly distributed
(ii) Energy is minimum at nodes and maximum at antinodes
(iii) Energy is maximum at nodes and minimum at antinodes
(iv) None of these

(ii) Energy is minimum at nodes and maximum at antinodes

## Q19. A resonating column of air contains

(i) Stationary longitudinal waves
(ii) Stationary transverse waves
(iii) Transverse progressive waves
(iv) Longitudinal progressive waves

(i) Stationary longitudinal waves

(i) twice
(ii) eight times
(iii) half
(iv) four times

(i) twice

## Q21. The quality of a note changes when change occurs in the

(i) pitch
(ii) loudness
(iii) wavelength
(iv) nature of overtones.

(iv) nature of overtones.

## Q22. The velocity of sound in any gas depends upon

(i) Wavelength of sound only
(ii) Density and elasticity of ga
(iii) Intensity of sound waves only
(iv) Amplitude and frequency of sound

(ii) Density and elasticity of ga

##### Q23. Four wires of identical lengths, diameters and material and stretched on a sonometer box. The ratio of their tension is 1 : 4 : 9 : 16. the ratio of their fundamental frequencies is

(i) 1 : 6 : 9 : 16
(ii) 4 : 3 : 2 : 1
(iii) 1 : 2 : 3 : 4
(iv) 1 : 4 : 9 : 16

(iii) 1 : 2 : 3 : 4

(i) Water
(ii) Air
(iii) Vacuum
(iv) Metal

(iv) Metal

## Q25. The fundamental frequency of an organ pipe is 512 Hz. If its length is increased, then frequency will

(i) decrease
(ii) increase
(iii) remains same
(iv) cannot be predicted

(i) decrease

(i) amplitude
(ii) wavelength
(iii) frequency
(iv) speed

(iii) frequency

## Q27. A tuning fork of frequency 480 Hz is in unison with pipe closed at one end vibrating in its first overtone. Then fundamental frequency of the pipe is

(i) 150 Hz
(ii) 160 Hz
(iii) 480 Hz
(iv) 190 Hz

(iii) 480 Hz

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