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Online Quiz (Worksheet A B C D)

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Upper Elementary Science - II
4.1 Light

When one flips on the light switch in a dark room, the room instantly fills with light. It seems to happen all at once. This is because light travels fast- amazingly fast. The speed of light is 186,000 miles per second. Light travels so fast that the time taken by a person to blink its eyes three times, light could travel to the moon and back.

Rays of light travel in straight lines. This can be seen by making shadows. In a darkened room, shine a desk lamp or flashlight at a wall. Hold a book in front of the light. The light doesn’t bend or curve around the book. Instead, the book blocks the rays of light, which are traveling in straight line. And so the shadow of the book is seen on the wall.

The book does not let light to pass through it because it is opaque. Opaque materials block light. A wooden door is opaque. So is a metal can. Some materials are the opposite of opaque. They are transparent. Transparent materials are clear. One can see through them. They let light pass through almost unchanged. Glass and water are transparent.

What is the color of sunlight? It seems as if it has no color. But the color of the sunlight is white. The amazing thing about it is that the white light of sunshine is actually made up of all the colors in the rainbow. Using a prism can prove it.

If one holds the prism near a sunny window, the light will shine through and make a rainbow like band of colors. This shows that even though light may appear to be white or colorless, light is really made up of all colors. When light goes through a prism, the glass slows it down and changes its path. The process is called refraction. A prism refracts the light. A lens refracts the light.

A prism separates white light into the spectrum of colors. The prism bends the rays of light, but rays of each color bends differently. Red bends the least. Violet bends the most.

Raindrops in the sky refract the light, which is what causes a rainbow. When light is refracted, it often separates into a combination of colors called the spectrum. The colors of the spectrum always appear in the same order: red, orange, yellow, green, blue, indigo, and violet.


Directions: Answer the following questions.
Q 1: Weather conditions over a long period of time are called the ________________.
climate
temperature
humidity

Q 2: If light is reflected that means light ______________.
is white
is absorbed
is stopped in its tracks
bounces back

Q 3: The visible spectrum is made up of ____________________.
red, blue, yellow, violet
red, orange, yellow, green, blue, indigo, and violet
red, purple, yellow, indigo, green
white and black

Q 4: Light always travels in this direction.
in waves
in trains and planes
east
straight lines

Q 5: Rainbows are really round.
only if there is gold at the bottom
false
true

Q 6: Kleenex is _____________________.
opaque
flat
transparent
translucent

Q 7: Your pupil becomes smaller when_____________________.
there is too much light
there is not enough light
it is night
you are scared

Q 8: Thomas Jefferson invented the light bulb.
false
true

Question 9: This question is available to subscribers only!

Question 10: This question is available to subscribers only!


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