Class 9 Sound Weekend Test

A disturbance that travels through a medium as a longitudinal wave

• sound
• wavelength
• pitch
• frequency

The number of wavelengths that pass a point each second

• frequency
• wavelength
• pitch
• amplitude

Speed of light in air is:

• 5100 m s^-1

• 3*10⁸m s^-1

• 330 m s^-1

• 3*10¹⁰ m s^-1

The speed of sound in air at 0^oC is nearly:

• 330m s^-1

• 1450 m s^-1

• 5100 m s^-1

• 450^-1

Which of the following would you hear as a low pitched sound? 

• sound wave with a frequency of 50 Hz
• sound wave with frequency of 10,000 Hz
• sound wave with an intensity of 10 dB
• sound wave with an intensity of 100 dB

Sound does not travel in space because

• Space is too far away.
• There is no matter in space.
• Space is the final frontier
• Space has planets.

You stand outside a room that has the doors and windows closed. Why can you still hear sounds made inside the room?

• Vibrations are absorbed in the doors and windows
• Vibrations are reflected inside the room
• Vibrations travel through the door and the window
• Vibrations echo in the room

_____________ is the highness or lowness of a sound.

• Amplitude

• Pitch

• Volume

• Vibration

High pitch sounds are caused by a ______ vibration

• fast 
• slow
• hard
• soft

As the temperature of a medium increases, the sound waves will travel ____________.

• Faster

• Slower

• As the same speed