Physics Waves MCQs Chapter 8 Class 11 - PLS Prep by PakLearningSpot

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Created on February 07, 2022 By Ali Durrani

Physics Ch 8 Class 11 Wave Motion and Sound

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1 / 63

If a compressible medium has bulk modulus denoted by B and density denoted by P, then a Newton’s formula for the speed of sound in a medium is _____.

NTS 2019
Physics
Wave Motion and Sound
Elimination Tool:

A) V = √ B / p

B) V = √ B p

C) V = B / p

D) V = √ p / B

2 / 63

A special class of waves that does not need a material medium for their propagation are called

NTS 2013
Physics
Wave Motion and Sound
Elimination Tool:

A) Electric waves

B) Magnetic waves

C) Electromagnetic waves

D) Sound waves

3 / 63

When a source is moving towards a stationary observer, the apparent change in frequency will be:

NUMS 2018
Physics
Wave Motion and Sound
Elimination Tool:

A) Greater than the original frequency

B) Remains the same as that of original frequency

C) Smaller than the original frequency

D) None of the above

4 / 63

The time period of a wave is 1/4 sec. How long does it take 20 complete waves to pass a point?

PMC Sample 1
Physics
Wave Motion and Sound
Elimination Tool:

A) 5 sec

B) 80 sec

C) 1/80 sec

D) 1/5 sec

5 / 63

If a wave can be polarized, it means, it is:

NUMS 2016
Physics
Wave Motion and Sound
Elimination Tool:

A) Longitudinal wave

B) Stationary wave

C) Superimposed wave

D) Transverse wave

6 / 63

Standing pattern of Nodes and Antlnodes form:

All of these

Stationary Waves

Progressive Waves

Travelling Waves

7 / 63

speed of sound is greatest in

Glass

Water

Methanol

Helium

8 / 63

in an organ pipe if one side is closed, then it is proved that harmonics released will be

Even numbers

Odd numbers

Odd and even both

fractional numbers

9 / 63

The time period of a wave is 1/4 sec. How long does it take 20 complete waves to pass a point?

PMC Sample 1
Physics
Wave Motion and Sound
Elimination Tool:

A) 5 sec

B) 80 sec

C) 1/80 sec

D) 1/5 sec

10 / 63

If two sounds have the same wavelength in air at the same temperature, what other property must they also have in common?

Intensity
Amplitude
Frequency
NTS 2017
Physics
Wave Motion and Sound
Elimination Tool:

A) I only

B) III only

C) I and II only

D) II and III only

11 / 63

A sound wave travels with a speed of 330ms−1 in air. If the wavelength of the wave is 3.3m, then the frequency of the wave is ______.

PMC Sample 2
Physics
Wave Motion and Sound
Elimination Tool:

A) 50 Hz

B) 100 Hz

C) 150 Hz

D) 200 Hz

12 / 63

The stationary waves can be set up on the string only with the frequencies of harmonic series determined by:

PMC Sample 3
Physics
Wave Motion and Sound
Elimination Tool:

A) the tension, length and mass per unit length of the string

B) the tension and mass per unit length of the string only

C) the length and mass per unit length of the string only

D) the tension and length of the string only

13 / 63

The SI unit for intensity of sound is:

NTS 2015 SMBBMC
Physics
Wave Motion and Sound
Elimination Tool:

A) Joule per second

B) watt per metre square

C) watt metre square

D) joule per metre square

14 / 63

The frequency of a wave as the source approaches the observer with speed v

Increases

First increases then decreases

Decreases

Remains same

15 / 63

If the waves interfere constructively, the amplitude of the resulting wave would be:

NUMS 2018
Physics
Wave Motion and Sound
Elimination Tool:

A) Less than either of the individual waves

B) Greater than either of the individual waves

C) Equal to the shortest of the individual waves

D) Equal to the greatest of the individual waves

16 / 63

A cathode ray oscilloscope is displaying an AC signal. If one wave is completed in 2 cm along X- axis and time-base setting is 10 ms/cm, then frequency of AC signal will be:

NUMS 2019 Cancelled
Physics
Wave Motion and Sound
Elimination Tool:

A) 100 Hz

B) 50 Hz

C) 20 Hz

D) 10 Hz

17 / 63

A wave, which transfers _____ by moving away from the source of disturbance is called _____ wave.

NUMS 2019 Reconduct
Physics
Wave Motion and Sound
Elimination Tool:

A) Momentum ; standing

B) Energy ; standing

C) Energy ; progressive

D) Momentum ; progressive

18 / 63

Technique for detecting the pressure of objects under water by acoustical echo is called:

NUMS 2018
Physics
Wave Motion and Sound
Elimination Tool:

A) Doppler effect

B) Sonar

C) Radar

D) Red shift

19 / 63

Astronomers calculate speed of distant stars and galaxies using which of the following phenomena:

PMC 2020
Physics
Wave Motion and Sound
Elimination Tool:

A) Beats

B) Interference

C) Superposition principle

D) Doppler effect

20 / 63

Which one of the following properties is not exhibited by the longitudinal waves?

PMC 2020
Physics
Wave Motion and Sound
Elimination Tool:

A) Interference

B) Reflection

C) Diffraction

D) Polarization

21 / 63

if particles are displaced In direction perpendicular to waves then waves are? a)

Longitudinal waves

transverse Waves

Stationary Waves

All of these

22 / 63

In a ripple tank, 40 waves pass through a certain point in one second. If the wavelength of the waves is 5 cm, then find the speed of the wave:

NUMS 2020
Physics
Wave Motion and Sound
Elimination Tool:

A) 2.7 m/s

B) 3 m/s

C) 200 m/s

D) 2 m/s

23 / 63

The wavelength associated with an electron is of the order of:

PMC 2020
Physics
Wave Motion and Sound
Elimination Tool:

A) Visible light

B) X rays

C) Radio waves

D) Infrared

24 / 63

20 waves pass through a point in a medium, in 5 seconds. What is the time required for one wave to pass?

PMC Sample 2
Physics
Wave Motion and Sound
Elimination Tool:

A) 1/4 sec

B) 4 sec

D) 2 sec

C) 1/2 sec

25 / 63

The path difference for the constructive interference is:

NUMS 2018
Physics
Wave Motion and Sound
Elimination Tool:

A) (n-1)λ

B) (n+1)λ

C) n λ / 2

E) n λ

26 / 63

In which of the following medium will the speed of sound be maximum?

Glass

Water

Copper

Wood

27 / 63

Trough of a wave acts as:

NUMS 2020
Physics
Wave Motion and Sound
Elimination Tool:

A) Concave lens

B) Convex lens

C) Convex mirror

D) Plane mirror

28 / 63

The points which are in phase are separated from one another through a distance of :

PMC Sample 1
Physics
Wave Motion and Sound
Elimination Tool:

A) 1 wavelength

B) 1.5 wavelength

C) 0.5 wavelength

D) 2.5 wavelength

29 / 63

If the amplitude is 200, the intensity is 300 When the amplitude is increased to 800 then what will be the intensity?

NUMS 2016
Physics
Wave Motion and Sound
Elimination Tool:

B) 1400

C) 1600

D) 1800

E) 4800

30 / 63

The frequency of a man’s voice is 300 Hz. If velocity of sound is 336 m/s, the wavelength of the sound is:

NTS 2016 SMBBMC
Physics
Wave Motion and Sound
Elimination Tool:

A) 1.12 m

B) 300 m

C) 330 m

D) 112 m

31 / 63

In a periodic wave, the distance between second and fifth crests is 15 cm, what is the wavelength of the wave?

PMC Sample 1
Physics
Wave Motion and Sound
Elimination Tool:

A) 45 cm

B) 5 cm

C) 1/5 cm

D) 1/3 cm

32 / 63

The beat frequency is given by:

NUMS 2014
Physics
Wave Motion and Sound
Elimination Tool:

A) |fa – fb|

B) |fa ÷ fb|

C) |fa x fb|

D) |fa + fb|

33 / 63

Blue colored source is seen Red if

Source is moving away from observer

Observer is moving away from source

Gamma rays' effect is observed

None of these

34 / 63

When the antinodes, in stationary waves, are passing through their equilibrium position, the energy is:

NUMS 2020
Physics
Wave Motion and Sound
Elimination Tool:

A) Potential only

B) Kinetic only

C) A combination of both forms of energy

D) There is no energy in stationary waves

35 / 63

When a train whistling passes near you, a considerable change in the pitch of the sound is heard. When the train is moving away, the pitch of the sound _____ whereas the pitch of the sound _____ when the train is approaching.

NTS 2019
Physics
Wave Motion and Sound
Elimination Tool:

A) Increases … decreases

B) Increases … remains same

C) Decreases … increases

D) Decreases … remains same

36 / 63

The product of frequency and time period is equal to:

NUMS 2020
Physics
Wave Motion and Sound
Elimination Tool:

A) 2

B) 3

C) 0

D) 1

37 / 63

If μ is the permeability of the medium and ∈ permittivity of the medium then the value of √ 1 / μ . ∈. Is equal to ______.

NTS 2019
Physics
Wave Motion and Sound
Elimination Tool:

A) Planck's constant

B) Speed of sound waves

C) Speed of ultrasound waves

D) Speed of light

38 / 63

A standing-wave pattern is formed when the length of the string is:

PMC Sample 3
Physics
Wave Motion and Sound
Elimination Tool:

A) an odd multiple of quarter wavelength

B) an integral multiple of quarter wavelength

C) an integral multiple of wavelength

D) an integral multiple of half wavelength

39 / 63

A traveling wave, in which the particles of the disturbed medium move perpendicular to the direction of propagation of the wave is called:

NUMS 2019 Reconduct
Physics
Wave Motion and Sound
Elimination Tool:

A) Transverse wave

B) Longitudinal wave

C) Standing wave

D) shock wave

40 / 63

Frequency of a travelling wave is 2000 Hz. Its speed is 300m/s. What is its wavelength?

PMC Sample 1
Physics
Wave Motion and Sound
Elimination Tool:

A) 20/3 m

B) 20×3 m

C) 3/20 m

D) 2/3 m

41 / 63

A pipe open at both ends has a length of 5m. The second harmonic frequency is _____. Velocity of sound in air = 340 m/s.

NUMS 2019 Reconduct
Physics
Wave Motion and Sound
Elimination Tool:

A) 17 Hz

B) 34 Hz

C) 68 Hz

D) 306 Hz

42 / 63

______ is defined as the sensation that sound produces in the ear of a listener and is clearly related to the frequency of sound. Frequency and ______ are both measured in Hertz (Hz). Thus greater the frequency the greater the _____ and lower the frequency lower the _______.

NTS 2017
Physics
Wave Motion and Sound
Elimination Tool:

A) Quality … Pitch … Loudness … Pitch

B) Pitch … Pitch … Pitch … Pitch

C) Loudness … Quality … Pitch … Quality

D) Quality … Quality … Quality … Quality

43 / 63

How many types of modulations are possible with sinusoidal carrier?

NTS 2016 SMBBMC
Physics
Wave Motion and Sound
Elimination Tool:

A) Only one

B) Two

C) Three

D) Four

44 / 63

Laplace’s correction to Newton’s formula is based on the fact that the compressions and rarefactions occur as ______.

NTS 2019
Physics
Wave Motion and Sound
Elimination Tool:

A) Adiabatic process

B) Isothermal process

C) Isochoric process

D) Isobaric process

45 / 63

The six strings of a guitar are the same length under nearly the same tension, but they have different thicknesses. On which string do waves travel the fastest?

NUMS 2015
Physics
Wave Motion and Sound
Elimination Tool:

A) The thickest string

B) The thinnest string

C) The wave speed is the same on all the strings

D) None of the above

46 / 63

A sound wave with a frequency of 343 Hz travels through the air. What is its wavelength? (speed of sound through air = 343 m/s)

NTS 2014
Physics
Wave Motion and Sound
Elimination Tool:

A) 1 m

B) 2 m

C) 3 m

D) 4 m

47 / 63

A ship approaching a seaport at 10 km/h sends a sonic signal of frequency of 1000 Hz. What is the apparent frequency of the signal as received by a receiver on the seaport?

NUMS 2015
Physics
Wave Motion and Sound
Elimination Tool:

A) 984 Hz

B) 1000 Hz

C) 1008 Hz

D) 1210 Hz

48 / 63

When the source moves towards an observer the frequency of waves as perceived by observer:

Increases

Decreases

Remains constant

None of these

49 / 63

Energy of sound waves is proportional to:

Frequency

Wavelength

Phase Angle

Velocity

50 / 63

The distance between two consecutive antinodes is equal to:

NUMS 2018
Physics
Wave Motion and Sound
Elimination Tool:

A) λ / 8

B) λ / 6

C) λ / 4

D) λ / 2

51 / 63

Echo is produced by reflection of sound waves from a denser medium. What is the phase change between sound wave and echo?

NUMS 2019 Cancelled
Physics
Wave Motion and Sound
Elimination Tool:

A) 0 degrees

B) 180 degrees

C) 270 degrees

D) 90 degrees

52 / 63

The speed of sound in air is 332 m/s. The speed of sound at 22 degrees centigrade will be:

PMC 2020
Physics
Wave Motion and Sound
Elimination Tool:

A) 345.2 m/s

B) 340 m/s

C) 350 m/s

D) 330 m/s

53 / 63

In Doppler effect, if listener moves towards a stationary source then:

NUMS 2020
Physics
Wave Motion and Sound
Elimination Tool:

A) Observed frequency is greater than original frequency

B) Observed frequency is less than original frequency

C) Observed frequency is equal to original frequency

D) Observed frequency is independent of original frequency

54 / 63

When out of phase waves meet at a point occurs:

Full constructive interference

No effect

full destructive interference

Same phase

55 / 63

A wave of light having the wave equation r = ro sin(wt) reflects from the water surface. After reflection, the equation of the wave will be:

r = r0cos(wt)

r = -r0cos(wt)

r = -r0sin(wt)

r = r0sin(wt)

56 / 63

Speed of sound in vacuum is:

340 m/s

3 x 10^8 m/s

4000 ft/s

None of these

57 / 63

In a ripple tank, 40 waves pass through a certain point in 1 second. If the wavelength of the wave is 5 cm, then speed of the wave is:

PMC 2020
Physics
Wave Motion and Sound
Elimination Tool:

A) 0.5 ms-1

B) 1 ms-1

C) 1.5 ms-1

D) 2 ms-1

58 / 63

Ratio of velocity of sound in oxygen as compared to hydrogen is

4 : 1

16 : 1

1 : 4

1 : 16

59 / 63

A travelling wave, in which the particles of the distributed medium, move parallel to the direction of propagation of the wave is called:

NTS 2019
Physics
Wave Motion and Sound
Elimination Tool:

A) Transverse wave

B) Circular wave

C) Longitudinal wave

D) Stationary wave

60 / 63

If, the speed of waves is 10m/sec and its frequency is 5Hz. Find its wavelength.

NUMS 2016
Physics
Wave Motion and Sound
Elimination Tool:

A) 1

B) 2

C) 4

D) 6

61 / 63

If modulated signal frequency is represented by fm, carrier frequency by fc, fmin and fmax represent minimum and maximum values respectively, then the lower sideband refers to the range:

NTS 2016 SMBBMC
Physics
Wave Motion and Sound
Elimination Tool:

A) fc – fmax to fc – fmin

B) fc + fmin to fc + fmax

C) fc – fm

D) fm – fc

62 / 63

The electron current is chiefly due to:

NUMS 2016
Physics
Wave Motion and Sound
Elimination Tool:

A) Cathode

B) Grid

C) Anode getter

D) Screen

63 / 63

A wave passes through a medium, each particle of the medium performs 100 complete vibrations in 5 seconds. What is the frequency of the wave:

PMC Sample 1
Physics
Wave Motion and Sound
Elimination Tool:

A) 2 Hz

B) 20 Hz

C) 4 Hz

D) 40 Hz

Your score is

The average score is 63%

4 responses to “Physics Waves MCQs Chapter 8 Class 11”

Warisha says:

August 25, 2022 at 9:52 am

The principle of superposition is applied to
A.radio waves
B.sound waves
C.string waves
D.All
SHAHEED ullah khan says:

September 5, 2022 at 7:22 am

D
Anonymous says:

September 10, 2022 at 4:53 pm

D
Abdul Samad says:

March 30, 2023 at 6:31 am

Modulation relation with frequency ???