Sound
1.The waves which require no medium for their propagation or production are called -
Ans - Electromagnetic waves
2. Example of electromagnetic waves
Ans- light and sound
3. how maney types of mechinal waves
Ans - Two type ( Longitudnial and transverse)
4. the Unity of frequency is -
Ans- Hertz
5. sound waves is an example of
Ans- Longitudnal mechanical waves
6.The sound having a frequency of 20 Hertz to20000 hertz known as -
Ans- Audible or sound waves
7.The velocity of sound less than 20 Hertz is known as-
Ans- Infrasonic waves
8. The infrasonic waves produced by
Ans- Earth quakes , volcanic, eruption,ocen waves , elephantsand whales
9.The velocity of sound more than 20000 Hertz is known as-
Ans- Ultrasonic Waves
10.Ultrasonic waves are used for -
Ans Sending signal ,measuring the depth of sea ,cleaning clothes and in Ultrasonography
11. bats can flay in the dark ,beacuse-
Ans - they are guideed by ultrasonic wavws produced by them
12. Sound can travel throgh -
Ans - solid , liquids and gases
13.sound waves can not pass through
Ans - vacuum
14.Speed of sound maximum in
Ans- Solid
15. Speed of sound minimum in
Ans- Gases
16.The speed of sound in air
Ans 332m/s
17.The speed of sound in water
Ans-1,438 m/s
18. The speed of sound in Iron
Ans- 5,130 m/s
19. By increaseing or decreasing the pressure the speed of sound remain-
Ans- Constant
20. With the rise of temprature the speed of sound is
Ans- Increases
21. The unit used to measure loudness of sound is
Ans - Decible
22. What is the maximum limit of sound intensity in decible units beyond which a human being cannot hear
Ans-85 decibel
23. Pitch of sound depends on
Ans frequency of sound waves
24. Supersonic air planes create a shock wave called -
Ans - Sonic boom
25. the echo is produced by the sound waves due to -
Ans -Reflection of sound
26. SONAR stands for
Ans- Sound Navigation and Ranging
27. Sonar is based on the principle of
Ans- Echo
28.Where is the SONAR used
Ans-Measure the depth of a sea
29.The doppler's effect is applicable for
Ans- Bothe sound waves and lighjt waves
30. The echo willbe heard if the orginal sound reflected by an obstacle is-
Ans-0.1 sec
1.The waves which require no medium for their propagation or production are called -
Ans - Electromagnetic waves
2. Example of electromagnetic waves
Ans- light and sound
3. how maney types of mechinal waves
Ans - Two type ( Longitudnial and transverse)
4. the Unity of frequency is -
Ans- Hertz
5. sound waves is an example of
Ans- Longitudnal mechanical waves
6.The sound having a frequency of 20 Hertz to20000 hertz known as -
Ans- Audible or sound waves
7.The velocity of sound less than 20 Hertz is known as-
Ans- Infrasonic waves
8. The infrasonic waves produced by
Ans- Earth quakes , volcanic, eruption,ocen waves , elephantsand whales
9.The velocity of sound more than 20000 Hertz is known as-
Ans- Ultrasonic Waves
10.Ultrasonic waves are used for -
Ans Sending signal ,measuring the depth of sea ,cleaning clothes and in Ultrasonography
11. bats can flay in the dark ,beacuse-
Ans - they are guideed by ultrasonic wavws produced by them
12. Sound can travel throgh -
Ans - solid , liquids and gases
13.sound waves can not pass through
Ans - vacuum
14.Speed of sound maximum in
Ans- Solid
15. Speed of sound minimum in
Ans- Gases
16.The speed of sound in air
Ans 332m/s
17.The speed of sound in water
Ans-1,438 m/s
18. The speed of sound in Iron
Ans- 5,130 m/s
19. By increaseing or decreasing the pressure the speed of sound remain-
Ans- Constant
20. With the rise of temprature the speed of sound is
Ans- Increases
21. The unit used to measure loudness of sound is
Ans - Decible
22. What is the maximum limit of sound intensity in decible units beyond which a human being cannot hear
Ans-85 decibel
23. Pitch of sound depends on
Ans frequency of sound waves
24. Supersonic air planes create a shock wave called -
Ans - Sonic boom
25. the echo is produced by the sound waves due to -
Ans -Reflection of sound
26. SONAR stands for
Ans- Sound Navigation and Ranging
27. Sonar is based on the principle of
Ans- Echo
28.Where is the SONAR used
Ans-Measure the depth of a sea
29.The doppler's effect is applicable for
Ans- Bothe sound waves and lighjt waves
30. The echo willbe heard if the orginal sound reflected by an obstacle is-
Ans-0.1 sec
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