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Electromagnetics

Total questions: 29

Worksheet time: 29mins

Name
Class
Date
1.
What will happen when these magnets are brought close together?
a)
They will attract each other.
b)
They will repel each other.
c)
Both magnets will turn to the left
d)
Both magnets will turn to the right
2.

The area around a magnet is called?

a)

magnetic field

b)

magnetism

c)

magnetic poles

d)

friction

3.

Longest Wavelengths and Lowest Frequencies?

a)

Visible Light

b)

Microwaves

c)

X-Rays

d)

Radio Waves

4.
A wave with a large wavelength will have a ______ frequency and _____ energy
a)
high, low
b)
high, high
c)
low, high
d)
low, low
5.
Which has the SHORTEST wavelength and, therefore, the highest frequency/most energy
a)
Radio waves
b)
Ultraviolet Rays
c)
Gamma Rays
d)
X-rays
6.
Which section of the spectrum is the ONLY one we can see?
a)
X-rays
b)
Visible Light
c)
Gamma Rays
d)
Ultraviolet Rays
7.
How are electromagnetic waves different from other waves? 
a)
They have very short wavelengths 
b)
They transmit energy instead of matter 
c)
They can travel through empty space
d)
They can change direction by reflection 
8.
What happens when two north poles of a magnet are placed together?
a)
they repel
b)
they attract
c)
they cancel each other out
d)
the strength of the magnet is doubled
9.
Magnets can interact without touching.
a)
True
b)
False
10.
What is a magnetic field?
a)
purple lines with arrows
b)
area of magnetic force around a magnet
c)
it's like a really big football field
d)
area of a magnet around a magnetic force
11.
The strongest part of a magnet is...
a)
the bars.
b)
the force field.
c)
the poles. 
d)
the middle.
12.
What kind of magnet can be turned on and off?
a)
refridgerator magnet
b)
electromagnet
c)
ferromagnet
d)
semimagnet
13.
Which way will the magnets move after they are released?
a)
Towards each other
b)
Away from each other
c)
Not enough information
14.

The closer the magnets are to each other the...

a)

weaker the magnetic force.

b)

bigger the magnet will be.

c)

stronger the magnetic force will be.

d)

smaller the magnet will be.

15.
Law of reflection state that - The angle of incidence is .................. to the angle of reflection.
a)
equal
b)
double
c)
half
16.
What is reflection?
a)
Reflection is the bouncing  of light off the surface that it strikes on.
b)
Reflection is the absorbing of light off the surface that it strikes on.
c)
Reflection is the bending of light off the surface that it strikes on.
d)
Reflection is the scattering of light off the surface that it strikes on.
17.
What is this called?
a)
refraction
b)
reflection
c)
reconstroction
d)
retraction
18.
According to the Law of reflection, a light ray striking a mirror
a)
continues moving through the mirror in the same direction
b)
moves into the mirror at a slightly different angle
c)
bounces off the mirror toward the direction it came from
d)
bounces off the mirror at the same angle it hits.
19.
The fact the two angles are the same is an example of....
a)
Refraction
b)
Angle of Incidence
c)
Law of reflection
d)
Magnification
20.
Why does the lower part of the child appear so much different in size from the upper part?
a)
The light rays that travel through water and then into air are refracted.
b)
The light rays that travel through water and then into air are enlarged.
c)
The light rays that travel through air and then into water are reflected.
d)
The light rays that travel through air and then into water are reduced.
21.
a)
Reflection
b)
Refraction
22.
Light bending as it passes through a rain drop is an example of...
a)
Refraction
b)
Reflection
23.

Motors convert _________ energy into ________ energy.

a)

mechanical (kinetic), electrical

b)

electrical, mechanical (kinetic)

c)

potential, kinetic

d)

free, mechanical

24.

________ pushes electrons through the circuit.

a)

Electric Potential

b)

Power

c)

Resistance

d)

Fuzzy Bear

25.

Current decreases when ______ decreases and _______ increases.

a)

resistance, voltage

b)

voltage, resistance

c)

power, resistance

d)

voltage, power

26.

When you add another resistor (or bulb) in a series circuits, the total resistance across the circuit ________. For parallel circuits, the total resistance ________ when you add another resistor (or bulb).

a)

increases, decreases

b)

decreases, increases

c)

stays the same, stays the same

d)

increases, stays the same

27.

If the hair dryer and the vacuum cleaner are both on, what is the power used? Which costs more to run, the hair dryer for 2 minutes, or the vacuum cleaner for 3 minutes?

a)

hair dryer

b)

vacuum cleaner

c)

the cost is the same

d)

impossible to tell

28.

When a magnetic field moves around a loop of wire, a(n) _______ is generated in the wire.

a)

star child

b)

current

c)

electric field

d)

permanent magnet

29.

Which can increase the strength of an electromagnet?

a)

increasing the number of coils around the nail

b)

increasing the number of batteries

c)

making the core bigger

d)

all of the above

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