Grade 4 Physics Quiz: Sound

How does sound travel through air?

• As a series of compressions and rarefactions of air molecules

• By moving faster than light

• By bouncing off the ground

• By traveling in straight lines

What is the process of sound traveling through a medium called?

• Propagation

• Refraction

• Absorption

• Reflection

Why can't sound travel through a vacuum?

• Vacuum is devoid of any matter, so there is no medium for sound to travel through.

• Vacuum is too cold for sound to travel through

• Vacuum absorbs all sound waves

• Sound waves are too weak to travel through a vacuum

What is vibration and how is it related to sound?

• Vibration is the rapid back and forth movement of an object, and it is related to sound because sound is produced by the vibration of an object.

• Vibration is the movement of an object up and down, and it is related to sound because sound is produced by the object being at rest.

• Vibration is the movement of an object in a circular pattern, and it is related to sound because sound is produced by the object being completely still.

• Vibration is the slow and steady movement of an object, and it is related to sound because sound is produced by the stillness of an object.

Can you give an example of a vibrating object?

• A basketball

• A guitar string

• A bowl of soup

• A bookshelf

How does vibration create sound?

• Vibration creates light instead of sound.

• Vibration causes the air particles to vibrate, creating sound waves.

• Vibration causes the air to become still, eliminating sound waves.

• Vibration has no effect on air particles.

What device do we use to measure sound?

• Thermometer

• Inch ruler

• Telescope

• Decibel meter

What unit is used to measure the intensity of sound?

• watt

• decibel

• meter

• kilogram

How does a decibel meter work?

• Calculates the speed of the sound

• Measures the temperature of the sound

• Measures the intensity of sound waves

• Counts the number of words spoken

What is amplitude in relation to sound waves?

• The number of sound waves per second.

• The speed at which sound travels through a medium.

• The distance between two consecutive points of the same phase in a sound wave.

• The measure of the maximum disturbance in a sound wave.