Multiple Choice
Anything that can do work has
a. light
b. heat
c. magnetism
d. energy
d. energy
Temperature is measured by a tool called a
a. scale
b. degree
c. thermometer
d. balance
c. thermometer
The starting point for most energy we use was
a. plants
b. animals
c. the sun
d. the Earth
c. the sun
We can see objects that are NOT light sources only if they
a. absorb light
b. reflect light
c. produce light
d. are heated
b. reflect light
metal spoon
conductor
Explain how shadows form.
Light can pass through some materials but not others. If the rays from a light source meet an object such as a tree or a person, they are blocked. So a shadow of the tree or person is created on the ground behind the light.
Food fuel and batteries go through.
a. storage tanks
b. physical change
c. chemical change
d. inertia
c. chemical change
Rays of light travel in
a. crooked lines
b. straight lines
c. wavy lines
d. zig zag lines
b. straight lines
When fuel burns, energy is
a. lost
b. absorbed
c. given off
d. used up
c. given off
The colored part of the eye is the
a. pupil
b. lens
c. iris
d. nerve
c. iris
plastic cup
insulator
What is the difference between doing work and using energy? Explain your answer.
Work is done only is something is moved. If you move a box, you are doing work. Energy can be used if something is not moved. Perhaps the box is too heavy to move. You still use energy in trying to move it.
Which of these has energy of motion
a. electricity
b. nonmoving things
c. moving things
d. light
c. moving things
Reflects is another word for
a. absorbs
b. bounces
c. shines
d. hits
b. bounces
Which of these is NOT a source of heat?
a. a wooden toy
b. a small lightbulb
c. a lit match
d. a distance start
a. a wooden toy
Electricity is a form of
a. heat
b. light
c. fuel
d. energy
d. energy
thermos
insulator
The item that is NOT a good conductor is
a. a metal spoon
b. an aluminum spoon
c. an iron pan
d. a wooden box
d. a wooden box
When light rays pass through a lens, they
a. stay straight
b. disappear
c. bend
d. reflect
c. bend
During burning, one kind of matter turns into
a. a different kind of matter and heat energy
b. heat energy only
c. a different kind of matter only
a. a different kind of matter and heat energy
The electric circuit in a flashlight is controlled by a
a. bulb
b. switch
c. battery
d. frame
b. switch
iron pot
conductor
Eclectic energy produces heat is a
a. bonfire
b. hair dryer
c. coal furnace
d. gas stove
b. Hair dryer
Tiny amounts of electricity are called eclectic
a. sparks
b. charges
c. circuits
d. magnets
b. charges
When most things get warmer, they also become
a. larger
b. smaller
c. harder
d. softer
a. larger
Electromagnets are found in all these objects EXCEPT a
a. doorbell
b. telephone
c. wind-up toy
d. microphone
c. wind-up toy
cookie sheet
conductor
The flow of electricity from place to place is an electric
a. current
b. circuit
c. charge
d. bolt
a. current
When you touch electric switches and appliances, your hands should be
a. wet
b. covered
c. dry
d. clean
c. dry
From its source, light travels in
a. one direction
b. north and south
c. all directions
d. east and west
c. all directions
Using electricity is dangerous in all the following situations EXCEPT
a. near water
b. while bathing
c. with broken cords
d. with dry hands
d. with dry hands
Hot potholder
insulator