Chapter-wise MCQ Questions

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Question-1. 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

  1. Sound will be louder but the pitch will not be different
  2. Sound will be louder and the pitch will also be higher
  3. Sound will be louder but the pitch will be lower
  4. Both loudness and pitch will remain unaffected
Answer-1

Question-2. A wave in slinky travelled two and fro in 5 sec the length of the slinky is 5m. What is the velocity of wave?

  1. 10m.s
  2. 5m/s
  3. 2m/s
  4. 25m/s
Answer-2

Question-3. Before the main shock waves, the earthquake produces the characteristic sound waves which some animals like rhinoceros can hear. Can you guess the kind of sound waves produced here?

  1. Infrasonic sounds
  2. Ultrasonic sounds
  3. Audible Sounds
  4. None of these
Answer-3

Question-4. Compression is a region of

  1. No pressure
  2. Low pressure
  3. Atmospheric pressure
  4. High pressure
Answer-4

Question-5. If the speed of a wave is 380 m/s and its frequency is 1900 Hz, then the wavelength of the wave will be

  1. 20 m
  2. 0.2 m
  3. 200 m
  4. 2 m
Answer-5

Question-6. If the wave is propagating having the number of waves shown in the figure per second ,then the frequency of the wave is

  1. 5Hz
  2. 6Hz
  3. 3Hz
  4. 10Hz
Answer-6

Question-7. In gases a sound wave is

  1. Longitudinal only
  2. Transverse only
  3. Both Transverse and Longitudinal
  4. Neither Transverse Nor Longitudinal
Answer-7

Question-8. Pitch of the wave is measured in terms of

  1. Speed of the wave
  2. Amplitude of the wave
  3. Frequency of the wave
  4. Time period of the wave
Answer-8

Question-9. SI unit of frequency is

  1. Meter
  2. Hertz
  3. M/s
  4. M/s2
Answer-9

Question-10. Sound waves are

  1. Longitudinal
  2. Partly longitudinal, partly transverse
  3. Transverse
  4. Sometimes longitudinal, sometimes transverse
Answer-10

Question-11. Sound waves with frequency less than 20 Hz and more than 20000 Hz is called

  1. Supersonic and ultrasonic
  2. Sonic boom and supersonic
  3. Infrasonic and sonic boom
  4. Infrasonic and ultrasonic
Answer-11

Question-12. Speed of sound depends upon

  1. Temperature of the medium
  2. Pressure of the medium
  3. Temperature of source producing sound
  4. Temperature and pressure of medium
Answer-12

Question-13. Speed of sound in vacuum is

  1. 300 m/s
  2. 600m/s
  3. 380m/s
  4. 340m/s
Answer-13

Question-14. The bats can fly in the darkness of night without colliding with the other objects by emitting special sounds while flying. Which characteristic of sound is used by the bats to navigate?

  1. Ultrasound
  2. Infrasound
  3. Audible sound
  4. None of these
Answer-14

Question-15. The characteristic of sound which enables us to distinguish one sound from another having the same pitch and loudness

  1. Timber
  2. Amplitude
  3. Shrillness
  4. Intensity
Answer-15

Question-16. The distance between any two compressions or rarefactions in a longitudinal wave is

  1. One wavelength
  2. Half wavelength
  3. Twice the wavelength
  4. One fourth wavelength
Answer-16

Question-17. The sound can travel in air when

  1. Particles of medium travel from one place to another
  2. There is no moisture in the atmosphere
  3. Disturbance travel from one place to another
  4. Both particles as well as disturbance travel from one place to another
Answer-17

Question-18. The sound which is produced due to a mixture of several frequencies is called

  1. A note
  2. A tone
  3. Frequency
  4. Amplitude
Answer-18

Question-19. The time period of a simple pendulum in a spacecraft orbiting the earth is

  1. Infinity
  2. Zero
  3. One second
  4. Two seconds
Answer-19

Question-20. We can distinguish between a man?s voice and a woman?s voice of the same loudness even without seeing them. This is due to a characteristic of sound which measures the shrillness of sounds. Can you choose the correct unit of the quantity on which this characteristic of sound depends?

  1. hertz
  2. meter/second
  3. meter
  4. unitless
Answer-20

Question-21. What do dolphins, bats and porpoise use

  1. Ultrasound
  2. Infrasound
  3. Both a and b
  4. None of them
Answer-21

Question-22. Which of the following can produce longitudinal as well as transverse waves under different conditions?

  1. Bats
  2. Slinky
  3. Tuning fork
  4. None of these
Answer-22

Question-23. You must have seen the doctor checking the sounds produced in the chest or heartbeat of a patient using a medical instrument called Stethoscope. On what principle does this Stethoscope work?

  1. Multiple refractions
  2. Multiple reflections
  3. Wave motion
  4. None of these
Answer-23



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