Which of the following is the most important source of light on Earth?

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Which of the following is a visible flash of light in the sky?

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What is the source of light in the picture?

• traffic lights

• headlights

• LED lights

• streetlights

All the animals are bioluminescent organisms except for one. Which is it?

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Why are candles and flashlights important at home?

• They can be used for emergencies.

• They can be used as decoration at home.

• They can be used as signals on the road.

• They can help us see the street at night.

Which of the following is a CFL light bulb?

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Describe the sound produced by the cat.

• loud sound

• soft sound

Describe the sound produced by the fireworks.

• loud sound

• soft sound

Describe the sound produced by this musical instrument.

• loud sound

• soft sound

Why is the sound coming from the fire alarm important?

• It can be used for communication.

• It serves as a warning.

• It is for entertainment.

• It helps us gather information.