# FSC Physics MCQs Chapter 8 Class 11

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Physics Ch 8 Class 11 Wave Motion and Sound

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

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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:

3 / 63

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

PMC 2020
Physics
Wave Motion and Sound
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How many types of modulations are possible with sinusoidal carrier?

NTS 2016 SMBBMC
Physics
Wave Motion and Sound
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5 / 63

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

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When out of phase waves meet at a point occurs:

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Standing pattern of Nodes and Antlnodes form:

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

PMC Sample 1
Physics
Wave Motion and Sound
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When the antinodes, in stationary waves, are passing through their equilibrium position, the energy is:

NUMS 2020
Physics
Wave Motion and Sound
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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
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______ 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
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A special class of waves that does not need a material medium for their propagation are called

NTS 2013
Physics
Wave Motion and Sound
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The electron current is chiefly due to:

NUMS 2016
Physics
Wave Motion and Sound
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The distance between two consecutive antinodes is equal to:

NUMS 2018
Physics
Wave Motion and Sound
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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
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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
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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:

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Speed of sound in vacuum is:

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Energy of sound waves is proportional to:

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speed of sound is greatest in

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

NUMS 2020
Physics
Wave Motion and Sound
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23 / 63

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

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

NUMS 2016
Physics
Wave Motion and Sound
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If the waves interfere constructively, the amplitude of the resulting wave would be:

NUMS 2018
Physics
Wave Motion and Sound
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Ratio of velocity of sound in oxygen as compared to hydrogen is

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

NUMS 2018
Physics
Wave Motion and Sound
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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
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Astronomers calculate speed of distant stars and galaxies using which of the following phenomena:

PMC 2020
Physics
Wave Motion and Sound
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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
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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
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The wavelength associated with an electron is of the order of:

PMC 2020
Physics
Wave Motion and Sound
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Blue colored source is seen Red if

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

NUMS 2019 Reconduct
Physics
Wave Motion and Sound
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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
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When the source moves towards an observer the frequency of waves as perceived by observer:

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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
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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
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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
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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
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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
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The SI unit for intensity of sound is:

NTS 2015 SMBBMC
Physics
Wave Motion and Sound
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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
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The product of frequency and time period is equal to:

NUMS 2020
Physics
Wave Motion and Sound
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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
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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
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The beat frequency is given by:

NUMS 2014
Physics
Wave Motion and Sound
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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
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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
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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
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If, the speed of waves is 10m/sec and its frequency is 5Hz. Find its wavelength.

NUMS 2016
Physics
Wave Motion and Sound
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A standing-wave pattern is formed when the length of the string is:

PMC Sample 3
Physics
Wave Motion and Sound
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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
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59 / 63

Trough of a wave acts as:

NUMS 2020
Physics
Wave Motion and Sound
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60 / 63

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

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

NUMS 2018
Physics
Wave Motion and Sound
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The path difference for the constructive interference is:

NUMS 2018
Physics
Wave Motion and Sound
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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
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The average score is 63%

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### 4 responses to “FSC Physics MCQs Chapter 8 Class 11”

1. Warisha says:

The principle of superposition is applied to
B.sound waves
C.string waves
D.All

2. SHAHEED ullah khan says:

D

3. Anonymous says:

D