Class10th Physics Chapter 11


Total Marks: 20

1. The frequency of ultra sounds is than the frequency of audible sound waves.
Higher Less Equal Less and equal
2. The sensation of sound persists in our mind is.
0.01 s 0.1 s 0.02 s 0.2 s
3. Old people cannot hear sounds even above .
15000 Hz 12000 Hz 8000 Hz 4000 Hz
4. If speed of sound is 320 ms , the distance covered in a time of 1.5 s will be
221 m 480 m 480 cm 408 m
5. The level of noise recommended in most countries over an eight hour workday is usually.
85 - 90 dB 84 - 90 dB 90 - 83 dB 90 - 80 dB
6. In general , the speed of sound is greater in .
Gases Liquids Solids None of these
7. When the frequency of a sound wave is increased, which of the following will decrease?
Wavelength period amplitude i and ii only
8. For a normal person, audible frequency range for sound wave lie between
10 Hz and 10 KHz 20 Hz and 20 KHz 25 Hz and 25 KHz 30 Hz and 30 KHz
9. The intensity level of train siren is.
120 dB 100 dB 130 dB 150 dB
10. We can distinguish between a shrill and grave sound by its .
Pitch Area Amplitude Loudness
11. Speed of sound at 25 C in flint glass is.
3980 m / s 5980 m / s 6040 m / s 5950 m / s
12. How does sound travel from its source to your car?
By infrared waves By vibrating in wires or strings By electromagnetic waves By change in air pressure
13. Astronauts in space used to communicate with each other by radio links because
Sounds waves travel very slowly in space Sound waves travel very fast in space Sound waves cannot travel in space Sound waves have low frequency in space
14. The loudness of a sound is most closely related to its
Frequency Amplitude Wavelength Period
15. Which form of energy sound is ?
Electrical Mechanical Thermal Chemical
16. When a body vibrates about its mean position , it produces.
Sound waves Electromagnetic waves Light waves Transverse waves
17. When the frequency of a sound wave is increased, which of the following will decrease? I) Wavelength II) period III) amplitude
i only iii only i and iii only i and ii only
18. In general , the speed of sound is greater in
Gases Liquids Solids None of these
19. Distance between two consecutive waves compression and rarefactions is called
Focal length Wave length Frequency Time period
20. The example of longitudinal waves is.
Radio waves Light waves Sound waves Water waves