CBSE Class 9 Science Sound Waves: Characteristics and Applications (Class 9 NCERT New) Quiz 2

1. The diagram shows a cartoon of a sound wave produced while a student is speaking.What happens to the sound wave when the student speaks louder?

A The amplitude increases B the wavelength will double C the speed will increase D the amplitude will decrease

2. Two sound waves of different frequencies interfere and produce a resulting waveform shown with four points (W, X, Y, and Z) marked on the new wave.At which point will the sound be the loudest ?

A W B X C Y D Z

3. The students in the diagram are communicating with the cans and string.Which is the most likely explanation of how the students can hear and communicate using the objects?

A A Mechanical Wave transfers sound through the string B sound bounces off the can and echoes C sound travels through the string as an electromagnetic wave D Transverse wave transfers sound through rope

4. Through which medium is it impossible to transmit sound waves?

A space B rock C air D water

5. As the fire truck approached Mary, the pitch of the siren got higher. Once the fire truck passed and moved away, the siren's pitch got lower. This change in pitch is because of a change in the sound wave's

A concussion. B amplitude. C reflection. D frequency.

6. What does pitch depend on?

A amplitude B frequency C intensity D volume of sound

7. A wave with a large wavelength will have a ______ frequency and _____ energy

A high, low B high, high C low, high D low, low

8. The shorter the wavelength the

A shorter the frequency B higher the freuqnecy C frequency stays the same D less energy

9. Sound is produced by

A music B vibrations of molecules C Electromagnetic Waves D Transverse Waves

10. What causes sound waves?

A Electromagnetic radiation B Vibrating sources C Temperature differences D Magnetic fields