Quiz about Electromagnetic Review

Question 1

What kind of magnet can be turned on and off?

Accepted Answer

electromagnet

Answer

refridgerator magnet

Answer

magnetite

Answer

iron

Question 2

How do electromagnets differ from regular magnets?

Accepted Answer

All of the above

Answer

They can be turned off and on

Answer

Their polarity can be reversed

Answer

Their strength can be changed

Question 3

Electromagnetism is a magnetism produced by an electric current.

Accepted Answer

True

Answer

False

Question 4

Electric current can flow through a wire only if it forms a ____

Accepted Answer

Closed Loop

Answer

Open Loop

Question 5

Gamma rays, X-rays, visible light, and radio waves are all types of ________.

Accepted Answer

Electromagnetic radiation

Answer

Nuclear energy

Answer

Chromatic aberration

Answer

Ultraviolet radiation

Question 6

Visible light, infrared radiation, and ultraviolet light are all forms of

Accepted Answer

electromagnetic radiation

Answer

ions

Answer

atmospheric gases

Answer

aerosols

Question 7

The energy transferred through space by electromagnetic waves.

Accepted Answer

Electromagnetic radiation

Answer

Longitudinal wave

Answer

Mechanical wave

Question 8

What rays are used in medicine and industry because they can penetrate materials and tissues?

Accepted Answer

X-Rays

Answer

Gamma Rays

Answer

Radio waves

Answer

Visible light

Question 9

Electromagnetic radiation is simply known as

Accepted Answer

light

Answer

refraction

Answer

reflection

Answer

time

Question 10

_____ is a common term from electromagnetic radiation

Accepted Answer

light

Answer

radiation

Answer

radio

Answer

waves

Question 11

Provide an example of radiation.

Accepted Answer

X-rays

Answer

Infrared light

Answer

Ultraviolet light

Answer

Microwaves

Question 12

Most of the electromagnetic radiation on Earth comes from

Accepted Answer

the sun.

Answer

radio towers.

Answer

X ray machines.

Answer

microwave ovens.

Question 13

Which type of radiation directly affects water and fat molecules in food and can be used to track weather patterns?

Accepted Answer

Microwave

Answer

Radio

Answer

Infrared

Answer

Visible

Question 14

What type of radiation is used in satellite communications?

Accepted Answer

Radio

Answer

Microwave

Answer

Infrared

Answer

Visible

Question 15

Which dude discovered that current in a wire caused a

deflection in a magnetic compass?

Accepted Answer

Oersted

Answer

Tesla

Answer

Faraday

Answer

Maxwell

Question 16

Which area of the bar magnet has the strongest magnetic field effects?

Accepted Answer

closer field lines near poles = stronger

Answer

Field lines are straighter = stronger

Answer

side of magnet is stronger

Answer

field lines furthest apart = stronger

Question 17

What is true about electricity and magnetic fields?

Accepted Answer

Electricity always creates a magnetic field.

Answer

Electricity is needed to create any magnet.

Answer

Electricity is stronger than a magnetic field.

Answer

Electricity prevents magnetic fields from occurring.

Question 18

Permanent Magnets and Electromagnets are similar in which TWO ways?

Accepted Answer

they both have a north and south pole

Accepted Answer

they are surrounded by a magnetic field

Answer

it can be turned off and on

Question 19

What does magnets repelling mean?

Accepted Answer

Magnets move away from each other

Answer

Magnets do not have magnetism

Answer

Magnets move towards each other

Question 20

Question 20.

Accepted Answer

some of the iron nails will fall

Answer

All iron nails will fall

Answer

All the nails will remain attracted

Question 21

Voltage can be induced in a wire by

Accepted Answer

all of these

Answer

moving the wire near a magnet.

Answer

moving a magnet near the wire.

Answer

changing the current in a nearby wire.

Question 22

Which of the following is a fundamental principle of electromagnetism?

Accepted Answer

Electric and magnetic fields are interrelated

Answer

Electric fields can exist without magnetic fields

Answer

Magnetic fields can exist without electric fields

Answer

Electric and magnetic fields are independent

Question 23

What is the primary function of a transformer in an electrical circuit?

Accepted Answer

To change the voltage level

Answer

To increase the current

Answer

To decrease the voltage

Answer

To convert AC to DC

Question 24

Which experiment demonstrated that a changing magnetic field can induce an electric current?

Accepted Answer

Faraday's law of induction

Answer

Young's double-slit experiment

Answer

Coulomb's law experiment

Answer

Ohm's law experiment

Question 25

What is the speed of electromagnetic waves in a vacuum?

Accepted Answer

$$3 imes 10^8$$ m/s

Answer

$$1.5 imes 10^8$$ m/s

Answer

$$2 imes 10^8$$ m/s

Answer

$$4 imes 10^8$$ m/s

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