MCQ Reflection of Sound Chapter 12 Class 9 Science

MCQ’s For All Chapters – Science Class 9th

1. There will be total 14 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 14

2. A stethoscope utilizes the principle of

reverberation

multiple reflection of sound

conservation of energy

multiple refraction of sound

Question 2 of 14

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 14

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 14

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 14

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 14

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 14

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 14

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 14

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 14

11. Assertion : The waves in which the individual particles of the medium move about their mean positions in a direction perpendicular to the direction of wave propagation, is known as Transverse waves.
Reason : The loudness or softness of a sound is determined basically by its amplitude.

Both Assertion and Reason are correct, and reason is the correct explanation for assertion.

Both Assertion and Reason are correct, and Reason is not the correct explanation for Assertion.

Assertion is true but Reason is false.

Assertion is false but Reason is true

Question 11 of 14

12. Assertion : The sound of the human voice is produced due to vibrations in the vocal cords.
Reason : Vibration means a kind of rapid to and fro motion of an object.

Both Assertion and Reason are correct, and reason is the correct explanation for assertion.

Both Assertion and Reason are correct, and Reason is not the correct explanation for Assertion.

Assertion is true but Reason is false.

Assertion is false but Reason is true

Question 12 of 14

13. Assertion : Echo is the repetition of sound due to reflection of original sound by a large and hard obstacle.
Reason : To hear a distinct echo, the time interval between the original sound and the reflected one must be at least 0.1 sec.

Both Assertion and Reason are correct, and reason is the correct explanation for assertion.

Both Assertion and Reason are correct, and Reason is not the correct explanation for Assertion.

Assertion is true but Reason is false.

Assertion is false but Reason is true

Question 13 of 14

14. Assertion : Sounds having more intensity and frequency are louder.
Reason : The loudness of a sound depends on Intensity and frequency.

Both Assertion and Reason are correct, and reason is the correct explanation for assertion.

Both Assertion and Reason are correct, and Reason is not the correct explanation for Assertion.

Assertion is true but Reason is false.

Assertion is false but Reason is true

Question 14 of 14

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