Grade 7 Sound Revision

Sound cannot pass through ____________.

• air

• vacuum

• gas

• liquid

The vibrating loudspeaker cone makes the air molecules next to it move _______________.

• back and forth

• up and down

In sound waves where the air molecules are close together it is called _______________

• compression

• rarefaction

Sound travel fastest in ___________ and slowest in ____________.

• gas, solid

• solid gas,

The outer ear is made up of ____________

• oval window, auditory nerves

• pinna, auditory canal and eardrum

Hammer anvil and __________ are the three small bones in your ear.

• stirrup

• cochlea

• femur

A loud speaker converts ____________ into ______________.

• sound wave to electrical signal

• electrical signal to sound wave

Sounds that we do not want to hear are called ____________.

• music

• noise

The intensity of sound is measured with sound level meter on a scale called_______________

• Decibel (dB) scale

• meter scale

• Ritcher scale

Sound is produced by -----

• Heat energy

• Low temperatures

• Vibrations

• Friction

Tags

NGSS.HS-PS4-1