 MCQ Questions for Class 11 Physics Chapter 15 Waves with Answers

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

Check the below NCERT MCQ Questions for Class 11 Physics Chapter 15 Waves with Answers Pdf free download. MCQ Questions for Class 11 Physics with Answers were prepared based on the latest exam pattern. We have provided Waves Class 11 Physics MCQs Questions with Answers to help students understand the concept very wel

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

(a) 720 m/s

(a) 320 Hz
(b) 300 Hz
(c) 280 Hz
(d) 260 Hz

(c) 280 Hz

## Q3. With the increase in temperature, the frequency of the sound from an organ pipe

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

(b) Increases

## Q4. 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

(b) Directly proportional to square of amplitude of wave

## Q5. The frequency of the note produced by plucking a given string increases as

(a) The length of the string increases
(b) The tension in the string increases
(c) The tension in the string decreases
(d) The mass per unit length of the string increases

(b) The tension in the string increases

(a) 242 / 252
(b) 2
(c) 5 / 6
(d) 11 / 6

(b) 2

## Q7. Energy is not carried by

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

(d) Stationary wave

(a) 1.22 V
(b) 0.61 V
(c) 1.50 V
(d) 0.75 V

(a) 1.22 V

## Q9. Energy is to be carried from one place to another. Which one of the following cannot be used?

(a) Longitudinal progressive waves
(b) Transverse progressive waves
(c) Electromagnetic waves
(d) Standing (stationary) waves

(d) Standing (stationary) waves

## Q10. 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

(a) Two sources which emit radiation of nearly the same frequency

## Q11. 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

(a) 1 : 6 : 9 : 16
(b) 4 : 3 : 2 : 1
(c) 1 : 2 : 3 : 4
(d) 1 : 4 : 9 : 16

(c) 1 : 2 : 3 : 4

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

a) frequency

a) Both
b) Air
c) Water
d) None of these

a) Both

## Q14. 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

a) both longitudinal and transverse elastic waves

a) A/2
b) A/4
c) 2 A
d) A

a) A/2

## Q16 The property of a medium necessary for wave propagation is

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

a) All of the above

## Q17. 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

a) Mach number

## Q18. Sound waves transfer

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

a) both energy and momentum

## Q19. The reason for introducing Laplace correction in the expression for the velocity of sound in a gaseous medium is

a) no change in the heat of the medium during the propagation of the sound through it
b) no change in the temperature of the medium during the propagation of the sound through it
c) change in the pressure of the gas due to the compression and rarefaction
d) change in the volume of the gas

a) no change in the heat of the medium during the propagation of the sound through it

## Q20. 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

a) Neither pressure nor density

## Q21. 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

a) Speed of sound waves is more

a) I and II
b) Only II
c) Only III
d) I, II and III

a) I and II