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Grade 4 Science
Grade 4 Science
Grade 4 Science
Grade 4 Science
100

Give an example of a light emitter and an example of a light reflector

Examples of Light Emitters The sun, stars, candles and light bulbs

Examples of Light Reflectors The moon, safety reflecting vests, and minerals

100

True or False
Examples of artificial lights include: candles

True

100

Is the sun an example of a natural or artificial light source?

Natural

100

What is an example of an artificial light source?

Answers with vary

200

What is Echolocation 

a physiological process for locating distant or invisible objects (such as prey) by sound waves reflected back to the emitter (such as a bat) from the objects

200

We learned that heat is also called thermal energy. It is the movement of tiny particles called molecules. 


Now is true or false that "The hotter a solid, liquid, or gas is, the slower the molecules move!"                                          

False
200

An object that lets some (but not all) light pass through is...

Translucent

200

An object may appear bent in water due to...

Refraction

300

T or F

The soothing noise of water lapping on the beach is an example of an artificial sound

FALSE

300

T or F

Sound is a form of energy

True

300

An object that appears blue ___________ blue light and ___________ other colours of light.

reflects, absorbs

300

Different wavelengths of light result in...

Different colours (some are invisible to the eye)

400

Sound comes from .............that create .............. .

vibrations

sound waves 

400

an sound travel in a vacuum? Why or why not?

No because there is no matter for the sound waves to travel along

400

The moon and a safety vest are similar sources of light because they both...

Reflect light from other light sources

400

It is harder to see the stars in the city because...

There are a lot of artificial light sources (light pollution)

500

Sound travels ....... times faster through water than through air

4 times

500

Sound travels at a speed of ...............km per H

1,230 km

500
An example of a technology that uses the principles of light refraction is...

Glasses, contact lenses, cameras

500

Why does an arrow appear backwards when viewed through water?  (This requires more than a one-word answer)

The light moves at different speeds through the glass, water, and air.