Grade 3 Physics Quiz: Properties of Air and Sound

What is the main component of air?

• Oxygen

• Hydrogen

• Carbon dioxide

• Nitrogen

How does air take up space?

• Air is actually empty space with nothing in it

• Air is made up of tiny particles called molecules that are constantly moving and colliding with each other.

• Air is just an illusion and doesn't really exist

• Air is made up of solid particles that don't move

What is air pressure?

• The speed of the wind

• The force exerted on a surface by the weight of the air above it.

• The number of oxygen molecules in the air

• The color of the sky

How does air help in the transmission of sound?

• Air amplifies the sound waves

• Air carries the sound waves

• Air reflects the sound waves

• Air absorbs the sound waves

Why does sound travel faster in solids than in air?

• The particles in solids are closer together, allowing sound waves to travel more quickly.

• Air particles move faster than solid particles

• Solids have less density than air

• Sound waves are not affected by the distance between particles

What happens to the sound when a vibrating tuning fork is placed in a jar and the air is removed using a vacuum pump?

• The sound cannot be heard

• The sound becomes higher in pitch

• The sound becomes softer

• The sound becomes louder

How does the pitch of sound change when the length of a vibrating string is increased?

• The pitch of the sound becomes louder

• The pitch of the sound becomes higher

• The pitch of the sound remains the same

• The pitch of the sound becomes lower

What happens to the sound when a vibrating tuning fork is placed in a jar and the air pressure is increased?

• The sound becomes softer

• The sound becomes louder

• The pitch of the sound decreases

• The pitch of the sound increases

What happens to the sound when a vibrating tuning fork is placed in a jar and the air temperature is increased?

• The sound becomes louder.

• The pitch of the sound increases.

• The sound becomes softer.

• The pitch of the sound decreases.

How does the sound produced by a vibrating tuning fork change when it is placed in a jar filled with helium gas?

• The sound produced by the tuning fork becomes louder.

• The pitch of the sound produced by the tuning fork increases.

• The pitch of the sound produced by the tuning fork decreases.

• The sound produced by the tuning fork becomes softer.