In this virtual science class for Grade 4, Teacher Edge reviews the properties of light, sound, and heat. The lesson includes a multiple-choice review, an exploration of sound characteristics, and a discussion on light and vision. Students engage in a true or false exercise to reinforce their understanding of the concepts. Key topics include the behavior of sound waves, the nature of light, and how we perceive non-luminous objects.

How does light travel?

• In a straight line

• In waves

• By conduction

• By convection

What is the process called when heat is transferred through fluids?

• Conduction

• Convection

• Reflection

• Radiation

What happens when sound hits a hard and smooth surface?

• It is reflected

• It is absorbed

• It is diffused

• It is refracted

What is the term for the sound wave that bounces back?

• Echo

• Reverberation

• Vibration

• Refraction

Which of the following is a luminous object?

• A plastic bottle

• A wooden table

• A light bulb

• The moon

Why can we see non-luminous objects?

• They emit their own light

• They reflect light

• They absorb light

• They refract light

What is the term for the loudness or softness of sound?

• Volume

• Tone

• Echo

• Pitch

What happens to the loudness of sound as it moves closer to the observer?

• It becomes an echo

• It increases

• It decreases

• It remains the same

What is the reason we can see objects at night?

• Refraction of light

• Absorption of light

• Reflection of light

• Emission of light

What is the term used for the combined effect of multiple echoes in a room?

• Echo

• Reverberation

• Vibration

• Diffusion