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General Physics Previously Asked Questions: Sound
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General Physics Previously Asked Questions: Sound
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25 Questions

1. Consider the following statements.
1. A widely used musical scale called diatomic scale has seven frequencies.
2. The frequency of the tone Sa is 256 Hz and that of Ni is 512 Hz. Which of the statements given above is/are correct?
2. The velocity of sound is maximum in
3. Which one of the following does a TV remote control unit use to operate a TV set?
4. What is the decibel level of sound produced by two persons in conversation?
5. The velocity of sound in air is approximately
6. Decibel unit is used to measure
7. Sound waves travel fastest in
8. Consider the following statements about ultrasonic waves.
1. They can destroy insects.
2. They can clean clothes by removing dust.
3. They can be used to treat diseases.
4. They can control automatic doors. Of the above statements.
9. The walls of the ball, built for music concerts should
10. Consider the following statements.
1. A flute of smaller length produces waves of lower frequency.
2. Sound travels in rocks in the form of longitudinal elastic waves only. Which of the statements given above is/are correct?
11. Which type of electromagnetic radiation is used in the remote control of a television?
12. Bats can fly during dark nights and also prey. This is because
13. A noise level of 100 decibel would correspond to
14. Which of the following has the longest wavelength?
15. Assertion (A): Radio waves bend in a magnetic field. Reason (R): Radio waves are electromagnetic in nature. Code
16. When T.V. is switched on
17. If Va, Vw and Vs respectively are the speed of sound in air, water and steel, then
18. In which of the following option sound may not be across travel?
19. A worker was working on the rail track. A boy at a distance holds his ear near the rail track. This boy was able to hear sound of the blow of workman twice. It is because of
20. The Doppler's effect is applicable for
21. Decibel is used to measure
22. The technique used to transmit audio signals in television broadcast is
23. Consider the following statements.
1. The heart vibrates at infrasonic.
2. The speed of sound is more in gas than in liquid and solid.
3. Mach number is used to describe the speed of sound.
4. Ultrasonic sound has frequency more than 20,000 Hz. Of these statements.
24. To hear a clear echo, the minimum distance between the reflecting surface and the observer should be
25. Ultrasonics are sound waves of frequency

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