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A person, pressing his ear on the railwa...

A person, pressing his ear on the railway tracks can hear an approaching train. This is possible because of

A

vibration of railway tracks

B

vibration of air

C

speed of sound is more in solid medium

D

hearing ability of the man

Text Solution

Verified by Experts

The correct Answer is:
C
Speed of sound is more in solid than air.
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(a) When we put our ear to a railway line, we can hear the sound of an approaching train even when the train is far off but its sound cannot be heared through the air. Why? (b) How could you convince a small child that when you speak, it is not necessary for air to travel from your mouth to the ear of a listener?

MTG IIT JEE FOUNDATION-SOUND -EXERCISE (MULTIPLE CHOICE QUESTIONS) (LEVEL - 1)
  1. Which of these pictures correctly show the way sound vibrations travel...

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  2. The speed of sound in air is

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  3. Regular vibration produces

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  4. A person, pressing his ear on the railway tracks can hear an approachi...

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  5. A person can be identified by the quality of sound produced by him. Th...

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  6. The voices of men, women and children are different due to difference ...

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  7. An object moving at a speed greater than that of sound is said to be m...

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  8. The velocity of sound in vacuum is

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  9. An object oscillates 50 times in one second. What should be its freque...

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  10. The time period of a simple pendulum is 0.2 s. What is its frequency o...

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  11. Hertz stands for

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  12. An aeroplane travelling at the speed of sound will have a velocity of

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  13. Sound is produced in a bamboo flute because

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  14. The difference between a musical sound and noise is

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  15. Noise pollution can cause

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  16. If you go on increasing the stretching force on a wire in a guitar, it...

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  17. A vibrating body

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  18. The instrument used in the laboratory to produce sound of a fixed freq...

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  19. Higher the frequency of a musical sound, is its pitch.

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  20. Quality of sound is used to distinguish between

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