Q 1– Sound can travel through:
(a) gases only
(b) solids only
(c) liquids only
(d) solids, liquids and gases
Q 2 –Voice of which of the following is likely to have minimum frequency:
(a) baby girl
(b) baby boy
(c) a man
(d) a woman
Q 3 –Vibration in a body produce:
(a) energy
(b) sound
(c) heat
(d) none of these
Q 4 – A shehnai produces sound from:
(a) vibrating strings
(b) vibrating membrane
(c) vibrating air column
(d) none of these
Q 5 – Drum produces sound from:
(a) vibrating membrane
(b) vibrating stretched membrane
(c) vibrating strings
(d) none of these
Q 6 – Frequency of oscillations is:
(a) the number of oscillations per minute
(b) the number of oscillations per hour
(c) the number of oscillations per second
(d) none of these
Q 7 – The unit of frequency is:
(a) hertz
(b) hertz /sec
(c) hertz / min
(d) hertz / hour
Q 8 – The frequency determines the of a sound.
(a) loudness
(b) pitch
(c) both loudness and pitch
(d) none of these
Q 9 – When the amplitude is small, the sound produced is:
(a) loud
(b) feeble
(c) low pitched
(d) none of these
Q 10 – The ultrasound equipment works at frequencies:
(a) higher than 20,000 Hz
(b) lower than 20,000 Hz
(c) less than 20 Hz
(d) none of these
Q 11 – Noise pollution causes:
(a) lack of sleep
(b) hypertension
(c) anxiety
(d) all of these
Q 12 – Trees planted along the roads reduces the harmful effect of:
(a) noise pollution
(b) air pollution
(c) both (a) and (b)
(d) none of these
Q 13 – Number of vocal cords in human is:
(a) one
(b) two
(c) four
(d) none of these
Q 14 – Sound:
(a) can travel through vacuum
(b) cannot travel through vacuum
(c) sound can sometimes travel through
(d) none of these vacuum
Q 15 – Sound:
(a) Sound requires a medium to travel
(b) does not require a medium to travel
(c) sometimes require a medium to travel
(d) none of these
Q 16 – Propagation of sound is fastest In:
(a) gases
(b) liquids
(c) solids
(d) vacuum
Q 17 – Sound does not travel in:
(a) vacuum
(b) gases
(c) solids
(d) liquids
Q 18 – Unwanted and unpleasant sounds are called:
(a) noise
(b) noise pollution
(c) music
(d) air pollution
Q 19 – Process of receiving sound vibrations and sensing them by brain is called :
(a) producing
(b) speaking
(c) sensing
(d) hearing
Q 20 – Voice box has stretched string like parts, which vibrate to produce sound are called:
(a) larynx
(b) vocal cords
(c) nerves
(d) arteries
Q 21 – Large amplitude of sound vibrations will produce:
(a) loud sound
(b) slow sound
(c) meak sound
(d) shreak
Q 22 – High frequency of sound vibrations will produce a:
(a) loud sound
(b) shreak
(c) meak sound
(d) low piched sound
Q 23 – Excess unwanted sounds is environment can cause:
(a) noise
(b) disturbance
(c) noise pollution
(d) air pollution
Q 24 – The range of audible sound for human ear is:
(a) less than 20 Hz
(b) more than 20,000 Hz
(c) from 20 Hz to 20,000 Hz
(d) none of these
Q 25 – The amplitude of the sound wave decides its:
(a) loudness
(b) pitch
(c) speed
(d) none of these
Q 26 – If the amplitude becomes twice than the loudness of sound increases by a factor of:
(a) 2
(b) 4
(e) no change
(d) none of these
Q 27 – In sitar sound Is produced by:
(a) beating
(b) rubbing
(c) blowing
(d) plucking
Q 28 – Note is a sound
(a) of mixture of several frequencies
(b) of mixture of two frequencies only
(c) of a single frequency
(d) always unpleasant to listen
Q 29 – A key of a mechanical piano struck gently and then struck again but mush harder this time. In the second case
(a) sound will be louder but pitch will not be different
(b) sound will be louder and pitch will also be higher
(c) sound will be louder but pitch will be lower
(d) both loudness and pitch will remain unaffected
Q 30 – In SONAR, we use
(a) ultrasonic waves
(b) infrasonic waves
(c) radio waves
(d) audible sound waves
Q 31 – Sound travels in air if
(а) particles of medium travel from one place to another
(b) there is no moisture in the atmosphere
(c) disturbance moves
(d) both particles as well as disturbance travel from one place to another.
Q 32 – When we change feeble sound to loud sound we increase its
(a) frequency
(b) amplitude
(c) velocity
(d) wavelength
Q 33 – In the curve half the wavelength is
(a) AB
(b) BD
(c) DE
(d) AE
Q 34 – Earthquake produces which kind of sound before the main shock wave begins
(a) ultrasound
(b) infrasound
(c) audible sound
(d) none of the above
Q 35 – Infrasound can be heard by
(a) dog
(b) bat
(c) rhinoceros
(d) human beings
Q 36 – Before playing the orchestra in a musical concert, a sitarist tries to adjust the tension and pluck the string suitably. By doing so, he is adjusting
(a) intensity of sound only
(b) amplitude of sound only
(c) frequency of the sitar string with the frequency of other musical instruments
(d) loudness of sound
Q 37 – Sound is produced by _________objects.
(a) fast moving
(b) vibrating
(c) stationary
(d) rotating
Q 38 – A key of mechanical piano is first struck gently and then struck again but much harder this time. What kind of change in sound
will you observe in the second case:
(a) Sound will be louder but the pitch will not be different
(b) Sound will be louder and the pitch will also be higher
(c) Sound will be louder but the pitch will be lower
(d) Both loudness and pitch will remain unaffected
Q 39 – In case of transverse waves the particles of a medium vibrate:
(a) In the direction of wave propagation
(b) Opposite to the direction of wave propagation
(c) At the right angles to the direction of wave propagation
(d) None of the above
Q 40 – The upper frequency limit of the audible range of human hearing is about
(a) 20 kHz
(b) 2000 Hz
(c) 2 kHz
(d) 2,000,000 Hz
Q 41 – The distance between a consecutive crest and trough is x. The wavelength of the wave is
(a) 4x
(b) x
(c) x/2
(d) 2x
Q 42 – Sound wave is a
(a) transverse wave
(b) longitudinal wave
(c) both a and b
(d) None of these
Q 43 – You can not talk to each other on the moon because
(a) atmosphere is not present, that is, there is vacuum
(b) you would not feel like talking
(c) compressions and rarefactions can only travel on earth’s surface
(d) gravity is 1/6th that on the earth
Q 44 – Sonic booms are caused by the combination of
(a) supersonic speed and pressure variation.
(b) infrasonic speed and pressure variation.
(c) ultrasonic sound and pressure variation.
(d) pressure variation only.
Q 45 – Frequency of infrasonic waves is ____________ than frequency of ultrasound waves.
(a) less
(b) more
(c) almost same
(d) none of these.
Q 46 – Sound travels
(a) slower in warm air than in cold air
(b) faster in solids and liquids than in air
(c) slower in water than air
(d) none of these
Q 47 – In longitudinal waves, how does the particle of medium vibrate compared to the direction of propagation of wave?
(a) Perpendicular
(b) Parallel
(c) At 45°
(d) At 60°
Q 48 – The sound waves in a medium are characterised by the:
(a) Linear motion of particles in the medium
(b) Rotatory motion of particles in the medium
(c) Oscillatory motion of particles in the medium
(d) None of the above
Q 49 – Sound can travel through
(a) gases only
(b) vacuum only
(c) gases and liquids only
(d) solids, liquids and gases.
Q 50 – The transfer of energy in a material medium due to the periodic motion of its particles is called:
(a) Wave front
(b) Wave motion
(c) Pulse
(d) None of the above
Q 51 – A wave moves a distance of 10m in 0.05 second. Find the wavelength of the wave if frequency is 200Hz?
(a) 0.8M
(b) 1m
(c) 0.5m
(d) 0./m
Q 52 – The maximum displacement of the particle of the mean from its mean position is called the
(a) Amplitude
(b) wavelength
(c) wave number
(d) none of these
Q 53 – Which of the following is a mechanical wave?
(a) Sound
(b) Light
(c) Radio waves
(d) X-rays
Q 54 – Wave motion transfers
(a) momentum
(b) velocity
(c) energy
(d) mass
Q 55 – The longitudinal waves can propagate only in :
(a) Solids
(b) Liquids
(c) Gases
(d) All the above
Q 56 – The sound waves which travel in the air are called:
(a) Transverse waves
(b) Longitudinal waves
(c) Polarised waves
(d) None of the above
Q 57 – Infrasonic waves have frequencies
(a) below 20 Hz
(b) between 20 Hz and 20,000 Hz
(c) above 20,000 Hz
(d) no upper or lower limit of frequencies
Q 58 – In the compression region of the medium in case of longitudinal wave:
(a) The volume monetarily decreases
(b) The density momentarily
(c) The pressure monetarily increases
(d) All the above
Q 59 – Which wave property determines loudness?
(a) pitch
(b) frequency
(c) amplitude
(d) All of these
Q 60 – Which is not the condition for hearing sound?
(a) There must be a vibrating body capable of transferring energy
(b) There must be a material medium to pick up and propagate energy
(c) The medium must have a large density
(d) There must be receiver to receive the energy and interpret it
Q 61 – In case of transverse wave :
(a) The hump on the + y axis is called crest
(b) The hump on the – y axis is called crest
(c) The highest point on the hump on + y axis is called crest
(d) The highest point on the hump on the – y axis is called crest
Q 62 – Sound cannot travel through
(a) air
(b) water
(c) iron
(d) space
Q 63 – In the bell jar experiment, as air is removed
(a) intensity falls
(b) speed of sound falls
(c) both (a) and (b)
(d) elasticity falls
Q 64 – A bat hears the echo of its squeak after 0.1 second. How far is the obstacle from the bat? Speed of sound is 344 m/s.
(a) 170m
(b) 17.2m
(c) 180m
(d) 18m
Q 65 – The method of detecting the presence, position and direction of motion of distant objects by reflecting a beam of sound
waves is known as _____.
(a) RADAR
(b) SONAR
(c) MIR
(d) CRO
Q 66 – Which of the following is not the character of mechanical waves ?
(a) Propagation depends on the elasticity of medium
(b) Can be both transverse or longitudinal
(c) Requires a material medium
(d) Speed is comparatively higher
Q 67 – A thunder clap is heard 5.5 seconds after lightning flash. The distance of the flash is (Velocity of sound in air = 330 m/s)
(a) 1750 m
(b) 1815 m
(c) 3000 m
(d) 3500 m
Q 68 – In the region of compression or rarefaction, in a longitudinal wave the physical quantity which does not change is:
(a) Pressure
(b) Mass
(c) Density
(d) Volume
Q 69 – A part of longitudinal wave in which particles of medium are farther away than the normal particles is called:
(a) Rarefaction
(b) Trough
(c) Compression
(d) Crest
Q 70 – Match the Column-A with Column-B:
| Column-A | Column-B |
| (a) Unit of frequency | (i) Amplitude |
| (b) Pleasant sound | (ii) High frequency |
| (c) Unwanted sound | (iii) Hertz |
| (d) High pitch sound | (iv) Music |
| (e) Loudness | (v) Noise |
Q 71 – State whether the following statements are True or False:
- Sound cannot travel in vacuum. True
2. The number of oscillations per sound of a vibrating object is called its time period. Fales
3. If the amplitude of vibration is large, False
4. For human ears, the audible range is 20 Hz to 20,000 Hz. True
5. The lower the frequency of vibration, the higher is the pitch. False
6. Unwanted or unpleasant sound is termed as music False
7. Noise pollution may cause partial hearing impairment. True
8. One hertz means one vibration per second. Fales
9. We can hear all the vibrations made by different bodies. False
10. Cusions, curtains and rugs absorb sound. True
11. The quality of sound depends on the material of vibrating part True
12. Sound with frequency above 20,000 Hz is called ultrasonic True
13. Smaller the amplitude of vibration, the louder is the sound. False
14. In human beings, the vibration of the vocal cords produces sound. True
Q 72 – Fill in the blanks:
1.Time taken by an object to complete one oscillation is called …………………….
2. Loudness is determined by the ……………………. of vibration.
3. The unit of frequency is ……………………..
4. Unwanted sound is called ……………………..
5. Shrillness of a sound is determined by the ……………………. of vibration.
6. Sound is produced by ……………………. objects.
7. ……………………. in human beings vibrate to produce sound.
8. When we touch a source of sound, we can feel the ……………………..
9. Sound cannot travel in ……………………..
10. The audible frequency for human ear is ……………………..
11. Sound requires a ……………………. to travel.
12. The number of vibrations per second defines …………………….
13. Sound travels fastest in ……………………..
14. Only vibrating bodies produce ……………………..
15. ……………………. part of dholak vibrate to produce sound.
16. ……………………. part of Sitar vibrate to produce sound
17. ……………………. part of flute vibrate to produce sound