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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. Put in ascending order the speed of sound in the mediums.
1. Water 2. Steel
3. Nitrogen
2. The Doppler's effect is applicable for
3. Sound waves travel fastest in
4. Assertion (A): Reveraberation mainly feels in large churches and in other large buildings. Reason (R): The walls, roof and ground may cause multiple sound reflections. Code
5. Which one of the following does a TV remote control unit use to operate a TV set?
6. The technique used to transmit audio signals in television broadcast is
7. 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.
8. The walls of the ball, built for music concerts should
9. Which of the following has the longest wavelength?
10. Which type of electromagnetic radiation is used in the remote control of a television?
11. The optimum sound level for human beings is
12. In television broadcast, the picture signals are transmitted by
13. Decibel is used to measure
14. To hear a clear echo, the minimum distance between the reflecting surface and the observer should be
15. Bats can fly during dark nights and also prey. This is because
16. The velocity of sound is maximum in
17. 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
18. Decibel unit is used to measure
19. What is the purpose of 'evolved Laser Interferometer Space Antenna (eLISA)' project?
20. As per the WHO, the safe noise level for a city is
21. When T.V. is switched on
22. Which one of the following is the effect of the flight of supersonic jet?
23. If Va, Vw and Vs respectively are the speed of sound in air, water and steel, then
24. Assertion (A): A jet aircraft moving at mach number equal to 1 travels faster at an altitude of 15 km than while moving at mach number equal to 1 near the sea level. Reason (R): The velocity of sound depends on the temperature of the surrounding medium. Code
25. 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.

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