- This picture shows a fan spinning clockwise. What would happen to the fan if the current changed direction?
Your answer:
it would spin counter clockwise
it would not change
it would spin faster
it would spin slower
- This picture shows 2 balloons repelling. What causes them to repel?
Your answer:
an equal number of protons
an unequal number of molecules
an unequal number of electrons
an equal number of electrons
- What is this showing?
Your answer:
the movement of the magnet is creating electricity, a generator
the force of the magnet is getting weaker
the coil of the wire is getting hotter
the force of the magnet getting stronger
- The picture shows a layout for parallel circuit. How many of the paths can electricity flow through?
Your answer:
none
1
2
3
- Why is metal used in electric circuits?
Your answer:
they are good insulators
they are heavy
they are shiny
they are good conductors
- What kind of circuit is this?
Your answer:
a short circuit
a circle circuit
a parallel circuit
a series circuit
- Which of these will not make an electromagnet stronger?
Your answer:
use a bigger battery
reverse the poles of the magnet
use a larger nail
add more coils of wire
- What will happen to a magnet if you cut it in half?
Your answer:
each piece will have a north pole and a south pole
they will no longer be magnetized
you can’t cut a magnet in half
one magnet will have 2 north poles, the other magnet will have 2 south poles
- Which shows the Earth’s magnetic field?
Your answer:
1
2
3
4
- If you make a compass, which would be the best item to use for the pointer?
Your answer:
wooden toothpick
quartz needle
iron nail
plastic straw
- What causes static electricity?
Your answer:
current electricity
electricity found in outer space
unequal number of positive and negative electrons
none of the above
- How are electrons moved from one object to another object?
Your answer:
by setting the objects close to each other
by rubbing the objects together
by throwing the objects on the ground
by separating the objects
- To make a TV, hair dryer and a fan work, which of these is a true fact about energy?
Your answer:
energy moves from low to high
energy is never used up
energy comes from the sun
energy can change forms
- What would happen if one of the wires were cut?
Your answer:
The alarm would go off
The wire would become hot
The clock would stop working
The battery would lose its charge
- A light bulb will not light up unless the electrical circuit is a
Your answer:
series circuit
parallel circuit
open circuit
closed circuit
- Which of these can make a magnetic field?
Your answer:
thunder
wind
ice
electricity
- Which of these electromagnetic charges does not repel each other
Your answer:
+ +
+ -
- -
none of these
- The magnetic field of any magnet is greatest _________
Your answer:
around the poles
only about the south pole
only around the north pole
around the middle
- Iron filings and bar magnets were placed on a sheet of paper. The following diagram shows the pattern made on the paper. At which location is the magnetic field the strongest?
Your answer:
1
2
3
4
- Which of the following converts electrical energy into heat and light?
Your answer:
light bulb
light switch
electric stove
electric fan