Science 5th grade: LIGHT

1. What two different types of sources does light come from?

• It can come from potential energy and kinetic energy

• It can come from natural and artificial sources

• It can come from crude oil and natural gas

1. Which of the following are examples of natural light sources?

• The Sun

• Lightning

• A flashlight

• A mobile phone

1. Which of the following are examples of artificial light sources?

• Lightning

• The sun

• A flashlight

• A ceiling lamp

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1. What happens when we light up a candle?

• The candle burns and reacts with oxygen in the air. This chemical reaction causes a flame that emits light.

• The candle burns and reacts with carbon dioxide in the air. This chemical reaction causes a flame that emits light.

• We require a charged battery, otherwise it will not work.

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2. Which of the following are characteristics of light?

• Speed

• Colour

• Direction

• Flexibility

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2. Does light travel fast? How fast does it travel?

• Yes, it does. Light travels almost as fast as airplanes fly.

• Yes, it does. Light travels at 300.000 km per second.

• No, it does not. Light travels at 300 km per second.

• No, it does not, light does not travel at all.

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2. How many colours does white light have?

• White light is composed of just the three primary colours (red, blue and green).

• White light is not composed of any colour, that is why is white.

• White light is composed of 7 colours like rainbows.

2. What happens when light travels? Does it always go on a straight line?

• If while traveling, light hits something, it could be absorbed or reflected depending on the material it hits. For example, a mirror would reflect light whereas a black wall would absorb it.

• If while traveling, light hits something, it will always be absorbed, no matter the material.

• If while traveling, light hits something, it will always be reflected, no matter the material.

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3. Can transparent materials let light pass through them?

• No, transparent materials block the light.

• Yes, they let light pass through them.

• Yes, but light just partially passes through.

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3. Which of the following are transparent materials.

• A mirror.

• A glass window.

• A plastic bag.

• Sunglasses.

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