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Class 11 Physics Objective Chapter – 15 Waves
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
Ans:-( a )
2.The speed of sound in a medium depends upon
( a ) its elasticity as well as its inertia.
( b ) its elasticity but not its inertia.
( c ) its inertia but not its elasticity.
( d ) neither its elasticity nor its inertia
Ans:-( a )
3. Name the characteristics of the sound that are affected by the change in temperature.
( a ) amplitude
( b ) frequency
( c ) intensity
( d ) wavelength
Ans:-( d )
4.An observer is moving towards a stationary source of frequency 250 Hz with a velocity of 40 m/s. If the velocity of sound is 330 m/s, the apparent frequency heard by the observer will be
( a ) 320 Hz
( b ) 300 Hz
( c ) 280 Hz
( d ) 260 Hz
Ans:-( c )
5. Which of the following are mechanical waves
( a ) Water waves
( b ) Sound waves
( c ) Seismic waves
( d ) All
Ans:-( d )
6. A complete cycle of wave is around
( a ) 45°
( b ) 90°
( c ) 180°
( d ) 360°
Ans:-( d )
7. With the increase in temperature, the frequency of the sound from an organ pipe
( a ) Decreases
( b ) Increases
( c ) Remain unchanged
( d ) Changes erratically
Ans:-( b )
8. 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
Ans:-( b )
9. The velocity of sound in a gas is proportional to:
( a ) the isothermal elasticity.
( b ) the adiabatic elasticity.
( c ) square root of the isothermal elasticity.
( d ) square root of the adiabatic elasticity.
Ans:-( d )
10.In the longitudinal waves the direction of vibration in medium of particle is
( a ) Perpendicular to propagation of wave
( b ) Parallel to propagation
( c ) Different from each other
( d ) Variable for time to time
Ans:-( b )
11. 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
Ans:-( b )
12. Which of the following are electromagnetic waves
( a ) Light
( b ) Radio waves
( c ) X rays
( d ) All
Ans:-( d )
13.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
Ans:-( b )
14.Whenever a wave enters from one medium to the another, its
( a ) velocity changes.
( b ) frequency changes.
( c ) frequency does not change.
( d ) wavelength remains constant.
Ans:-( c )
15.Energy is not carried by
( a ) Longitudinal progressive waves
( b ) Electromagnetic waves
( c ) Transverse progressive waves
( d ) Stationary wave
Ans:-( d )
16.A siren placed at a railway platfrom is emitting sound of frequency 5 kHz. A passenger sitting in a moving train A records a frequency of 5.5 kHz while the train approaches the siren. During his return journey in a different train B he records a frequency of 6.0 kHz while approaching the same siren. The ratio of velocity of train B to that of train A is
( a ) 242 / 252
( b ) 2
( c ) 5 / 6
( d ) 11 / 6
Ans:-( b )
17.Electromagnetic waves
( a ) Requires material medium for their propagation
( b ) Do not require material medium for their propagation
( c ) Both a and b
( d ) None
Ans:-( b )
18.The extension in a string, obeying Hookes law is X. The speed of sound in the stretched string is V. If the extension in the string is increased to 1.5 X, the speed of sound will be
( a ) 1.22 V
( b ) 0.61 V
( c ) 1.50 V
( d ) 0.75 V
Ans:-( a )
19.The velocity of sound in any gas depends upon
( a ) wavelength of sound only.
( b ) amplitude and frequency of sound.
( c ) density and elasticity of the gas.
( d ) intensity of sound waves only
Ans:-( c )
20.When a sound wave goes from one medium to another, the quantity that remains unchanged is
( a ) frequency
( b ) wavelength
( c ) amplitude
( d ) speed
Ans:-( a )
21.The extension in a string, obeying Hookes law is X. The speed of sound in the stretched string is V. If the extension in the string is increased to 1.5 X, the speed of sound will be
( a ) 1.22 V
( b ) 0.61 V
( c ) 1.50 V
( d ) 0.75 V
Ans:-( a )
22.______ waves can travel through vacuum
( a ) Sound waves
( b ) Light waves
( c ) Radio waves
( d ) Both b and c
Ans:-( d )
23.When two waves meet, their displacements
( a ) add up
( b ) cancel out
( c ) destruct each other
( d ) subtract down
Ans:-( a )
24.The extension in a string, obeying Hookes law is X. The speed of sound in the stretched string is V. If the extension in the string is increased to 1.5 X, the speed of sound will be
( a ) 1.22 V
( b ) 0.61 V
( c ) 1.50 V
( d ) 0.75 V
Ans:-( a )
25.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
Ans:-( c )
26.The elastic or matter waves in a solid are
( а ) longitudinal.
( b ) transverse.
( c ) either longitudinal or transverse.
( d ) neither longitudinal nor transverse.
Ans:-( c )
27.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
Ans:-( a )
28.The extension in a string, obeying Hookes law is X. The speed of sound in the stretched string is V. If the extension in the string is increased to 1.5 X, the speed of sound will be
( a ) 1.22 V
( b ) 0.61 V
( c ) 1.50 V
( d ) 0.75 V
Ans:-( a )
29.The speed of electromagnetic waves is
( a ) 299,792,458 m/s
( b ) 299, 792, 458 km/s
( c ) 299, 792, 458 cm/s
( d ) None
Ans:-( a )
30. As wave travels, intensity of wave
( a ) decreases
( b ) increases
( c ) doesn’t change
( d ) becomes zero
Ans:-( a )
31.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
Ans:-( d )
32.The equation of wave traveling along string is y = 3 cos p ( 100t – x ) in C.G.S. unit then wavelength is
( a ) 1 m
( b ) 2 cm
( c ) 5 cm
( d ) None of above
Ans:-( b )
33.With the propagation of longitudinal wave through a material medium, the quantities transmitted in the propagation direction are
( a ) energy.
( b ) energy and linear momentum.
( c ) energy and mass.
( d ) energy, mass and momentum
Ans:-( a )
34. Two tuning forks of frequencies 256 and 258 vibrations/second are sounded together. Then the time interval between two consecutive maxima heard by an observer is
( a ) 2 sec
( b ) 0.5 sec
( c ) 250 sec
( d ) 252 sec
Ans:-( b )
35.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
Ans:-( d )
36.Pressure is given by
( a ) F/m
( b ) F/V
( c ) F/A
( d ) FA
Ans:-( c )
37.A complete cycle of wave is around
( a ) 45°
( b ) 90°
( c ) 180°
( d ) 360°
Ans:-( d )
38.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
Ans:-( a )
39.A resonating column of air contains
( a ) Stationary longitudinal waves
( b ) Stationary transverse waves
( c ) Transverse progressive waves
( d ) Longitudinal progressive waves
Ans:-( a )
40.When a tuning fork vibrates, the waves produced in tuning the Fork are
( a ) transverse both in the prongs and the stem.
( b ) longitudinal in both the prongs and stem.
( c ) longitudinal in stem and transverse in prongs.
( d ) longitudinal in prongs and transverse in the stem.
Ans:-( c )
41.Which of the following expressions is that of a simple harmonic progressive wave
( a ) a sin wt
( b ) a sin ( wt ) cos ( kx )
( c ) a sin ( wt – kx )
( d ) a cos kx
Ans:-( c )
42.A resonating column of air contains
( a ) Stationary longitudinal waves
( b ) Stationary transverse waves
( c ) Transverse progressive waves
( d ) Longitudinal progressive waves
Ans:-( a )
43.Sound waves are the
( a ) Transverse waves
( b ) Longitudinal waves
( c ) Both a and b
( d ) None
Ans:-( b )
44.Frequencies of sound produced from an organ pipe open at both ends are
( a ) even and odd harmonics
( b ) only odd harmonics
( c ) only even harmonics
( d ) none of these
Ans:-( a )
45.When a sound wave goes from one medium to another, the quantity that remains unchanged is
( a ) frequency
( b ) wavelength
( c ) amplitude
( d ) speed
Ans:-( a )
