CBSE Questions for Class 11 Engineering Physics Waves Quiz 2 - MCQExams.com

Fill in the blank. 
When a sound wave, travelling in a medium bounces back to the same medium after striking the same second medium then _______ occurs.
  • reflection
  • refraction
  • diffraction
  • scattering
The maximum displacement of a vibrating body from one extreme position to another extreme position is called amplitude. True or false
  • True
  • False
Mark the correct statement
  • Hard surfaces are good reflectors of sound.
  • Soft surfaces are poor reflector of sound.
  • Bad reflectors of sound are good absorbers of sound.
  • All
Sound from the neighbouring room can be heard because
  • sound travels in straight line.
  • reflections of sound at walls.
  • refraction of sound at walls.
  • none of the above
Mark the correct match.
  • Good reflectors of sound - Tiles, Marble slabs.
  • Bad reflectors of sound - Thick curtains, thick carpets.
  • Good absorbers of sound - Holed cardboard.
  • All
The quantity $$\dfrac{1}{\lambda}$$ is known as:
  • wave velocity
  • frequency
  • wavelength
  • wave number
When a wave travels in a medium, _______ is transferred from one place to other with the wave.
  • mass
  • velocity
  • density
  • energy
Soundproof walls use materials that
  • absorbs sound
  • reflects sound in all directions
  • reflects sound in only one direction
  • amplify sound waves on one side and weaken sound waves on other
Sound waves get reflected from :
  • plane surfaces
  • spherical surfaces
  • hard surfaces
  • all of these
Mark the correct statements.
(I) directions in which the sound is incident and is reflected make equal angles with the normal to the reflecting surface.
(II) reflection of sound occurs from a polished surface.
(III) reflection of sound occurs from rough surface.
  • I, II
  • I, III
  • II, III
  • I, II, III
Two particles on a wave having wavelength $$2$$m are at the distances of $$5$$m and $$9$$m respectively from origin. The phase difference between the particles is ________.
  • $$\displaystyle\frac{\pi}{2}$$ rad
  • $$\pi$$ rad
  • $$2\pi$$ rad
  • $$4\pi$$ rad
Working of radars in oceans is based on the principle of
  • geo-positional system
  • reflection of sound
  • locus of sound waves
  • none
The minimum phase difference between two simple harmonic oscillations,
$${ y }_{ 1 }=\dfrac { 1 }{ 2 } \sin { \omega t } +\dfrac { \sqrt { 3 }  }{ 2 } \cos { \omega t } $$
$${ y }_{ 2 }=\sin { \omega t } +\cos { \omega t } $$
  • $$\dfrac { 7\pi }{ 12 } $$
  • $$\dfrac { \pi }{ 12 } $$
  • $$-\dfrac { \pi }{ 3 } $$
  • $$\dfrac { \pi }{ 6 } $$
The frequency of light in air is $$5\times 10^{14}Hz$$. What will be the frequency of light, when it enters in the water?
  • $$2.5\times 10^{14}Hz$$
  • $$5\times 10^{14}Hz$$
  • $$10^{15}Hz$$
  • $$2.5\times 10^{12}Hz$$
The equation of sound wave is $$y=0.0015\;sin(62.4x+316t)$$. Find the wavelength of this wave :
  • $$0.2$$ unit
  • $$0.1$$ unit
  • $$0.3$$ unit
  • none of these
The frequency of radio waves corresponding to a wavelength of 10 m is
  • $$3\times 10^7\,Hz$$
  • $$3.3\times 10^8\,Hz$$
  • $$3\times 10^9\,Hz$$
  • $$3\times 10^{-7}\,Hz$$
Let, the velocity of a wave be $$V$$, time period $$T$$, frequency $$\gamma$$ and wavelength $$\lambda$$. Mark the correct relation between these three.
  • $$VT = \dfrac{1}{\lambda}$$
  • $$VT = \lambda$$
  • $$\dfrac{V}{T} = \lambda$$
  • $$\dfrac{T}{V} = \lambda$$
The phase difference between two points is $$\pi/3$$. If the frequency of wave is 50 Hz, then what is the distance between two points? (given v = 330 m/s)
  • 2.2 m
  • 1.1 m
  • 0.6 m
  • 1.7 m
The speed of sound in air is $$320m/s$$. The fundamental frequency of an open pipe $$50cm$$ long will be
  • $$320Hz$$
  • $$160Hz$$
  • $$640Hz$$
  • $$960Hz$$
A wave is travelling in a medium with frequency $$f = {10}^{14} Hz$$ and speed $$v = 100 {m}/{s}$$, Find out its wavelength?
  • $${10}^{-16} m$$
  • $${10}^{-12} m$$
  • $${10}^{10} m$$
  • $${10}^{12} m$$
  • $${10}^{16} m$$
Find out the frequency of orange light whose wavelength is $$6 \times {10}^{-7} m$$. The speed of light is $$3 \times {10}^{8} {m}/{s}$$.
  • $$2 \times {10}^{15} Hz$$
  • $$2 \times {10}^{-15} Hz$$
  • $$5 \times {10}^{14} Hz$$
  • $$5 \times {10}^{-14} Hz$$
  • $$2 \times {10}^{14} Hz$$
Which wave parameter can be found if the wavelength & the frequency is known to us?
  • speed
  • frequency
  • amplitude
  • wavelength
  • period
A particle executes simple harmonic motion with amplitude $$A$$. The distance moved by the particle in one oscillation is:
  • Zero
  • $$A$$
  • $$2A$$
  • $$4A$$
Which phenomenon is observed due to the change in  speed of wave when it strikes the another medium's boundary ?
  • Reflection
  • Refraction
  • Polarization
  • Diffraction
  • Interference
Two stretched strings have lengths l and 2l while tension are T and 4T respectively. If they are made of same material the ratio of their frequency is:
  • 2 : 1
  • 1 : 2
  • 1 : 1
  • 1 : 4
Find out the wavelength of a light wave travelling at $$3 \times {10}^{8} {m}/{s}$$ has a frequency of $$6 \times {10}^{15} Hz$$.
  • $$5 \times {10}^{-8} m$$
  • $$2 \times {10}^{-7} m$$
  • $$5 \times {10}^{-7} m$$
  • $$5 \times {10}^{-6} m$$
  • $$2 \times {10}^{7} m$$
Fill the vacant space with the suitable option. A wave transfers ______from one location to another.
  • energy, but not matter
  • matter, but not energy
  • both energy and matter
  • neither energy nor matter
  • Waves do not transfer anything across locations.
Which of the following wave parameter measures the height of the wave crest ?
  • amplitude
  • wavelength
  • period
  • speed
  • frequency
The amplitude of the wave shown above is:
485586.PNG
  • 8.0 m
  • 2.0 m
  • 4.0 m
  • 1.0 m
  • 0.5 m
Orange light has a wavelength of $$6 \times 10^{-7}m$$. What is its frequency? The speed of light is $$3 \times 10^{8}m/s$$.
  • $$2 \times 10^{15} Hz$$
  • $$2 \times 10^{-15} Hz$$
  • $$5 \times 10^{14} Hz$$
  • $$ 5\times 10^{-14} Hz$$
  • $$2 \times 10^{14} Hz$$
A wave is travelling on a string as shown in the figure. Find out the amplitude of the wave ?

488114.png
  • 0.5m
  • 1.0m
  • 2.0m
  • 4.0m
  • 6.0m
When a wave travelling in the air gets refracted by another medium. Identify which of the properties will change due to refraction?
I. Speed
II. Wavelength
III. Frequency
  • I only
  • II only
  • I and II only
  • II and III only
  • I, II, and III
If a wave has frequency $$f=10^{14} Hz$$ and speed v = 100 m/s, what is its wavelength? 
  • $$10^{-16}m$$
  • $$10^{-12}m$$
  • $$10^{10}m$$
  • $$10^{12}m$$
  • $$10^{16}m$$
A wave is propagating along a string with a speed of $$320 {cm}/{s}$$ as shown in the figure above.
Find out the amplitude of the given travelling wave ?
486250.jpg
  • $$1 cm$$
  • $$2 cm$$
  • $$4 cm$$
  • $$8 cm$$
  • $$16 cm$$
The picture below shows too "snapshots" of the same spring-mass system. In the snapshot on the left, the spring is completely uncompressed and completely unstretched. In the snapshot on the right, the spring is stretched as much as it will be during the oscillating motion.
The time it takes to move from the one position to the other is shown, as is the vertical distance.
With the information in this diagram, what two quantities could be determined?
496400.jpg
  • Spring constant and amplitude of oscillation
  • Period and amplitude of oscillation
  • Spring constant and period of oscillation
  • Spring constant and amount of mass hanging
  • Amplitude of oscillation and amount of mass hanging
Two waves interfere with each other then which of the following statement is true?
  • They always create a larger wave than either of the individual waves
  • The larger wave always cancels the smaller wave
  • The displacements of the individual waves are added at each point
  • An antinode is always created
  • An node is always created
During interference of waves, the amplitude of the resulting wave can be found at any position using the principle of:
  • superposition
  • interference
  • diffraction
  • none of these
Identify which one of the following can be represented by the product of the other two?
I. Speed
II. Wavelength
III. Frequency
  • I
  • II
  • III
  • Any one is the product of the other two
  • None of the three is the product of the other two
The equation, $$y = A \sin [2(vt- x)]$$ represent a plane progressive harmonic wave proceeding along the positive X-direction. The equation, $$y = A \sin[2(x -vt)]$$ represents
  • a plane progressive harmonic wave proceeding along the negative X-direction
  • a plane progressive harmonic wave with a phase difference of proceeding along the negative X-direction
  • a plane progressive harmonic wave with a phase difference of proceeding along the positive X-direction
  • none of the above
A wave of frequency 500 Hz has a velocity of 360 m $$s^{-1}$$. Calculate the distance between two points that are $$60^0$$ out of phase.
  • 12 cm
  • 18 cm
  • 24 cm
  • 32 cm
What will be the wave velocity, if the radar gives $$54$$ waves per min and wavelength of the given wave is $$10 m$$?
  • $$4 m {s}^{-1}$$
  • $$6 m {s}^{-1}$$
  • $$9 m {s}^{-1}$$
  • $$5 m {s}^{-1}$$
When a transverse wave on a string is reflected from the free end, the phase change produced is ___________.
  • Zero rad
  • $$\dfrac { \pi }{ 2 } $$ rad
  • $$\dfrac { 3\pi }{ 4 } $$ rad
  • $$\pi$$ rad
The distance between two consecutive crests in a wave train produced on a string is $$5 cm$$. If two complete waves pass through any point per second, the velocity of the wave is
  • $$10 cm {s}^{-1}$$
  • $$2.5 cm {s}^{-1}$$
  • $$5 cm {s}^{-1}$$
  • $$15 cm {s}^{-1}$$
A stationary wave is the sum of 
  • two opposite direction travelling wave
  • two opposite direction travelling wave with same frequency
  • two same direction travelling wave
  • none of the above
A closed organ pipe is excited to produce the third overtone of the air column.Then it will have,
  • Three nodes and three antinodes
  • Four nodes and four antinodes
  • Four nodes and three antinodes
  • none of the above
Wave motion happens due to 
  • propagation of energy
  • propagation of matter
  • propagation of both energy and matter.
  • None of these.
Which of the following is different from others?
  • Wavelength
  • Velocity
  • Frequency
  • Amplitude
The SI unit of amplitude is  ___________ .
  • Hertz
  • Metre
  • Second
  • None of these
In stationary waves, nodes are the points where there is:
  • maximum displacement and minimum pressure change
  • minimum displacement and maximum pressure change
  • minimum displacement and minimum pressure change
  • maximum displacement and maximum pressure change
The figure shows a surface $$XY$$ separating two transparent media, medium - $$1$$ and medium - $$2$$. The lines $$ab$$ and $$cd$$ represent wavefronts of a light wave travelling in medium - $$1$$ and incident on $$XY$$. The lines $$ef$$ and $$gh$$ represents wavefronts of the light wave in medium - $$2$$ after refraction.
Light travels as a:
1010783_dbd441fe5fb7436dacf9cb9db417a5a7.png
  • Parallel beam in each medium
  • Convergent beam in each medium
  • Divergent beam in each mediu,
  • Divergent beam in one medium and convergent beam in the other medium
0:0:1


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