Reflection of Sound, Class 9 Science

1. There will be total 10 MCQ in this test.
2. Please keep a pen and paper ready for rough work but keep your books away.
3. The test will consist of only objective type multiple choice questions requiring students to mouse-click their correct choice of the options against the related question number.
4. No negative marking for incorrect choice.
5. Please click on “Finish the Test” when you want to exit.
6. All the best – Happy Studying

1. Audio frequency range of human ear is 20 Hz to 20000 Hz. The range of human ear in terms of time period is

 A

 B

 C

 D

Question 1 of 10

2. A stethoscope utilizes the principle of

 reverberation

 multiple reflection of sound

 conservation of energy

 multiple refraction of sound

Question 2 of 10

3. How far away is the cliff from the child, if a child hears an echo from a cliff 6 second after the sound produced by powerful horn? The velocity sound in air at 22°C is 344 m/s.

 688 m

 1000 m

 58 m

 1032 m

Question 3 of 10

4. Why are the walls and roof of an auditorium are covered with sound absorbent materials?

  To reduce reverberation

 To reduce noise

  To improve sound quality

 To increase pitch of the sound

Question 4 of 10

5. To reflect sound waves from any surface, it should have dimensions

 Always less than the wavelength of sound wave

 Always greater than wavelength of sound wave

 Equal or greater than wavelength of sound wave

 Equal or less than wavelength of sound wave

Question 5 of 10

6. Audible range of sound of human being is

 20 Hz to 10,000 Hz

 20 Hz to 2000 Hz

 10 Hz to 20,000 Hz

 20 Hz to 20,000 Hz

Question 6 of 10

7. We can hear the sound of the horn of an approaching car before the car reaches, because

 high pitch sound of horn

 It did not face any obstacle

 low pitch sound of horn

 speed of sound is greater than car’s speed

Question 7 of 10

8. Reverberation produced in large auditoriums is due to:

 Absorption of sound by floor

 Absorption of sound by walls

 Reflection of sound by walls and ceiling

 Reflection of sound by windows

Question 8 of 10

9. When sound gets reflected from a surface

 the angle of incidence < angle of reflection

 the angle of incidence = the angle of reflection

 the angle of reflection is equal to 90°

 the angle of incidence > angle of reflection

Question 9 of 10

10. Minimum time interval for hearing a distinct echo is

 2.0 s

  0.1 s

  0.2 s

  1.5 s

Question 10 of 10

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