eVidyarthi

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
13
 
 
 
 

Question 1 of 10

2. A stethoscope utilizes the principle of
 
 
 
 

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.
 
 
 
 

Question 3 of 10

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

Question 4 of 10

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

Question 5 of 10

6. Audible range of sound of human being is
 
 
 
 

Question 6 of 10

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

Question 7 of 10

8. Reverberation produced in large auditoriums is due to:
 
 
 
 

Question 8 of 10

9. When sound gets reflected from a surface
 
 
 
 

Question 9 of 10

10. Minimum time interval for hearing a distinct echo is
 
 
 
 

Question 10 of 10