What causes sound to travel through the air?

• Light

• Vibration

• Heat

• Pressure

How do two friends use a string and cups to communicate? What is the reason behind it?

• Because the cups are made of papers which conducts sound better

• Because the string vibrates and carries the sound from one cup to another

• Because the cups amplify the sound making it easier to hear

• Because the cups are large and can hold more sound

While swimming, Randu noticed that he could hear his friend calling him from the shore. How is this possible?

• His friend is using a loudspeaker to amplify the sound.

• Randu has special hearing abilities that allow him to hear underwater.

• Sound waves can travel through both water and air, reaching Randu's ears.

• Randu's friend is very close to the water, making it easier for Randu to hear.

This part of the ear is responsible for collecting sound waves and directing them into the ear canal.

It is referred to as the...

• ear drum

• ear canal

• pinna

• tympanic membrane

Which of the following is an example of a luminous object?

• a moon

• a mirror

• the Earth

• an LED lamp

The sound could be louder when traveling through the solid.

• True

• False

Using sharp objects to clean our ears can be dangerous.

• True

• False

The pitch of a sound is determined by its frequency.

• True

• False

A plane mirror provides a clear image of an object.

• True

• False

Not all materials can transmit light.

• True

• False