Q1. Sound from an object is not audible to us. So, we can conclude that the object is not vibrating.
- True
- False
- Q2. Which of the following will does not allow sound propagation?
- Air
- Steel
- Water
- Vacuum
- Q3. A compression is a region of
- high frequency
- low frequency
- high pressure
- low pressure
- Q4. Gumbaz is made parabolic in shape so as
- To produce high amplitude sound
- To produce high pitch sound
- To produce clear sound
- To produce multiple echoes
- Q5. In echocardiography, ultrasonic waves are made to reflect from various parts of the lungs and form its image.
- True
- False
- Q6. Distance between a compression and its alternate rarefaction is one fourth the wavelength of the wave.
- True
- False
- 7. By counting the number of vibrations of a tuning fork per second ________ can be found.
- frequency of the wave
- density of the medium
- amplitude
- timbre of the sound
- Q8. If we increase the temperature of air from 0ºC to 22ºC then the speed of sound would
- Decrease
- Remain same
- Increase
- Increase till 1°C and then decrease
- Q9. In longitudinal waves, how does the particle of the medium vibrate compared to the direction of propagation of wave?
- Perpendicular
- Parallel
- At 45o
- At 60o
- Q10. In which of the following mediums does sound travel fastest at a particular temperature?
- Aluminium
- Water
- Hydrogen
- Iron
- Q11. A baby cries with a frequency 712 Hz. If the speed of sound in air is 356m/s then the wavelength of sound will be
- 0.005 m
- 0.05 m
- 0.5 m
- 5 m
- Q12. Sound is produced by ________ objects.
- vibrating
- fast moving
- stationary
- rotating
- Q13. Loudness and softness of sound depends on
- Speed of the wave
- Wavelength of the wave
- Amplitude of the wave
- Time period
- Q14. A wave is a disturbance that moves through a medium along with the particles of the medium.
- True
- False
- Q15. Sound is produced from a flute and a harmonica by passing air through these musical instruments at same the time and same distance from ear. Also, the sound produced travels through the same medium which air. However, they differ in sounds due to difference in
- Amplitude
- Speed of sound in air
- Wavelength
- Pitch
- Q16. Sound propagates faster through solids than through liquids
- True
- False
- Q17. Which of the following quantities is transferred during wave propagation?
- Energy
- Mass
- Speed
- Particles
- Q18. A swing has a time period of 1.4 seconds. The number of oscillations made by it within 1 minute 24 seconds will be
- 20
- 40
- 60
- 80
- Q19. The amount of sound energy passing each second through unit area is known as intensity of sound.
- True
- False
- Q20. Why are the walls and roof of an auditorium covered with sound absorbent materials?
- To improve sound quality
- To reduce reverberation
- To reduce noise
- To increase pitch of the sound
- Q21. Audio frequency range of human ear is 20 Hz to 20000 Hz. What will be the range of human ear in terms of the time period?
- 5 x 10−2 s to 5 x 10−5 s
- 5 s to 5 x 10−5 s
- 50 s to 5 x 10−5 s
- 50 s to 50 x 10−5 s
- Q22. A ship sends SONAR and receives an echo after 2 seconds. If the speed of sound waves in water is 1500 m/s, then the depth of the sea is
- 1500 m
- 750 m
- 1000 m
- 500 m
- Q23. How far away is the cliff from the child, if he hears an echo from a cliff 6 second after the sound produced by a powerful horn? Take speed of sound = 344 m/s
- 1032 m
- 1000 m
- 688 m
- 58 m
- Q24. Which of the following is the correctly arranged in the increasing order of speed of sound in steel, distilled water, sea water and oxygen?
- Steel > Distilled water > Sea water > Oxygen
- Oxygen < Distilled water = Sea water < Steel
- Oxygen < Distilled water < Sea water < Steel
- Steel < Distilled water = Sea water < Oxygen
- Q25. Earthquakes produce ultrasound before the main shock waves begin which alerts the animals.
- True
- False
- Q26. On which of the following quantities does the pitch of the sound depend?
- Wavelength
- Amplitude
- Frequency
- Speed
- Q27. The sound waves in air are ________ waves.
- longitudinal
- transverse
- seismic
- partially longitudinal and partially transverse
- Q28. SI unit of frequency is
- metre
- hertz
- seconds
- metre per second
- Q29. The vibrations or the pressure variations inside the inner ear are converted into electrical signals by the
- Cochlea
- Hammer, anvil and stirrup
- Pinna
- Nerves
- Q30. What is the motion of the particles of a medium when a sound wave is passing through it?
- Rotatory
- Translatory
- Random
- Oscillatory
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