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Grade 4 Revision
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Objects that make light bounce off are called...
Reflectors
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Which is NOT a light source?
Rocks
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A band of light is called a ...
Beam
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Identify the ray.
Reflected ray
Incoming light ray
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A ray that hits a surface is called...
Reflected ray
Incoming light ray
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Which of these is translucent?
Paper
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Identify the ray.
Reflected ray
Incoming light ray
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Objects that make their own light are called ...
Light Sources
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Name the instrument.
Periscope
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Surfaces that are better at absorbing light are...
Smooth
Rough
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Which of the following is a light source?
Clouds
Moon
Sun
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Is this diagram correct? Why or Why not?
No, the two angles are not the same.
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A measure of the amount of light in an area.
Light Intensity
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Which of the following is NOT a light source?
Sun
Stars
Moon
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Identify how light travels in a periscope that makes the boy see the bird above him.
Sun - Bird - Mirror 1 - Mirror 2 - Boy's eyes
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Light intensity can be measured using a ...
Protractor
Ruler
Lightmeter
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In the past, people measure light intensity in ...
Candlepower
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Identify how light travels that makes the boy to see the chair.
The light from the bulb travels to the chair. The chair reflects the light to the boy's eyes.
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Which of these is/ are opaque?
Pencil
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Identify how light travels that makes the boy to see the cupcake.
The light from the candle travels to the cupcake. The cupcake reflects the light to the boy's eyes.
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Surfaces that are better at reflecting light...
Rough
Smooth
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What does it do to light?
Absorb
Reflect
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A solid image of a person or a scene, the shape of a shadow.
Silhouette
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This happens when drops of water in the air are hit by sunlight at a certain angle.
Rainbow
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Which of these is transparent?
Water bottle
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A ray that bounces off a surface is called...
Incoming light ray
Reflected ray
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It is the process where light is bounced off from a surface, changing its direction.
Reflection
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Identify how light travels that makes the girl see the sun.
The light from the sun travels to the girl's eyes.
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What does it do to light?
Absorb
Reflect
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Which is better at absorbing light?
Rocks
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