Quiz about Science 9 Final Review Electricity

Question 1

Some particles in an atom are charged. Those that are positively charged are called:

Accepted Answer

protons

Answer

neutrons

Answer

electrons

Answer

positrons

Question 2

When charged objects are brought close to uncharged (neutral) objects, the following occurs inside the neutral object

Accepted Answer

charge separation

Answer

electrical discharge

Answer

charge neutralization

Answer

charge atomization

Question 3

The laws of electric charges include all of the following except

Accepted Answer

opposite charges repel each other

Answer

opposite charges attract each other

Answer

similar (like) charges repel each other

Answer

charged objects attract neutral objects

Question 4

Which of the following examples can be used to demonstrate the behavior of current electricity?

Accepted Answer

water flowing down a river

Answer

water contained in a hot water tank

Answer

water being held back by a dam

Answer

water freezing on a lake

Question 5

After removing the laundry from the clothes dryer, you notice that two socks are sticking together. An explanation for what has happened is

Accepted Answer

one of the socks has gained electrons from the other sock, causing it to become negative while causing the other sock to become positive

Answer

both socks have gained protons and, as a result, are attracted to each other

Answer

protons have moved from one sock to the other, making one positively charged sock and one negatively charged sock

Answer

both socks have gained electrons and, as a result, are attracted to each other

Question 6

An electrical current can only be produced if there is a

Accepted Answer

a steady flow of charged particles

Answer

large quantity of particles

Answer

a safe supply of energy

Answer

discharge of electricity

Question 7

The units used to measure the flow of an electric current are

Accepted Answer

amperes

Answer

potential energy

Answer

volts

Answer

ohms

Question 8

Which of the following objects would an electrical current most likely have a difficult time passing through?

Accepted Answer

rubber eraser

Answer

pencil lead

Answer

paper clip

Answer

copper wire

Question 9

When electricity takes a path that is unintended, it is called a

Accepted Answer

short circuit

Answer

incomplete circuit

Answer

incomplete pathway

Answer

short pathway

Question 10

While you are cooking with the hot plate and toasting a slice of bread, the electric heaters start. Almost immediately, the hot plate, toaster, and electric heaters quit working. This most likely happened because

Accepted Answer

a circuit breaker in the electrical panel tripped

Answer

a fuse in the toaster burned out

Answer

the element in the hot plate burned out

Answer

the circuit breakers in the electric heaters tripped

Question 11

While checking all the fuses and circuit breakers, you notice that in the electrical panel, a 20A fuse has been placed in the circuit designed for a 15A fuse. This is a dangerous situation because

Accepted Answer

an increase in electrical current may cause the wires to overheat

Answer

the fuse does not fit properly

Answer

the fuse may cause an electrical shock

Answer

an increase in electrical current may cause the fuse to trip

Question 12

The electrolyte paste, which enables a dry cell to conduct electricity, does so because it contains

Accepted Answer

chemicals that form ions.

Answer

static electrical charges.

Answer

metal plates that release electrons.

Answer

an insulator.

Question 13

The basic components of an electrochemical cell include

Accepted Answer

two electrodes made of different materials, and an electrolyte made of a liquid or paste solution

Answer

two electrodes made of the same material, and a solid electrolyte made of a pure substance

Answer

two liquid electrodes separated by a solid electrolyte made of two different metals, usually copper and zinc

Answer

two electrodes made of different materials, and an electrolyte made of a pure substance

Question 14

A rechargeable battery can be recharged because the

Accepted Answer

chemical reactions can be reversed.

Answer

electrodes can be reversed.

Answer

electrolyte is being replaced.

Answer

wet cells dry out.

Question 15

Less expensive products can be coated with a thin layer of an expensive metal (like gold) to make them look more expensive and to make them last longer (prevent rusting). This process is called

Accepted Answer

electroplating

Answer

electricity

Answer

electrolysis

Answer

electrorefining

Question 16

Water flow from a faucet can be used to model current, voltage, and resistance. If the faucet is only slightly open, it models increased __________, and decreased ____________.

Accepted Answer

resistance, current

Answer

voltage, current

Answer

current, voltage

Answer

current, resistance

Question 17

Resistance varies with the length and thickness of the wire used for resistance. In a wire, resistance increases as the

Accepted Answer

length increases and the thickness decreases

Answer

length and thickness increases

Answer

length and thickness decreases

Answer

length decreases and the thickness increases

Question 18

Electricity flows through superconductors much more easily than through other types of conductors because superconductors have a low

Accepted Answer

resistance

Answer

conductivity

Answer

amperage

Answer

density

Question 19

In order for the coiled wires to give off heat, they must be constructed of a material that

Accepted Answer

offers high resistance

Answer

has a high conductivity

Answer

has a high voltage

Answer

offers low resistance

Question 20

Using the schematic diagram above, what are the correct components that make up the circuit?

Accepted Answer

a 1-cell battery and 3 loads

Answer

3 switches and a 1-cell battery

Answer

1 2-cell battery and 3 loads

Answer

3 motors and a 2-cell battery

Question 21

The circuit shown above, that has only one pathway for the electricity to flow is called a

Accepted Answer

series circuit

Answer

parallel circuit

Answer

integrated circuit

Answer

microcircuit

Question 22

A circuit diagram that represents the front and back door lights of a cabin wired in parallel is

Accepted Answer

Option B is correct

Answer

A.

Answer

C.

Answer

D.

Question 23

Which of the following circuit diagrams did the electrician draw?

Accepted Answer

Option C is correct

Answer

A.

Answer

B.

Answer

D.

Question 24

While servicing an ATV, the mechanic checks to see if the headlights provide sufficient light. Which of the following diagrams illustrates a circuit that would provide the brightest lights for an ATV?

Accepted Answer

Option D is correct

Answer

A.

Answer

B.

Answer

C.

Question 25

Which of the following circuit diagrams did the electrician draw?

Accepted Answer

Option A is correct

Answer

B.

Answer

C.

Answer

D.

Question 26

The device on an electric heater that controls how much electric current will flow through the electric heater, and therefore how much heat is produced, is called a

Accepted Answer

variable resistor

Answer

resistor

Answer

switch

Answer

breaker switch

Question 27

The electricity that comes from power outlets in North American homes has a voltage of 120 V. A device that required 3000 V would require which of the following components in order to change the voltage?

Accepted Answer

step-up transformer

Answer

variable resistor

Answer

step-down transformer

Answer

fuse

Question 28

You read that your light bulb has a power rating of 60 W and a voltage rating of 120 V. What is the current, in amperes (A), passing through the hairdryer?

Accepted Answer

0.5 A

Answer

2.0 A

Answer

7200 A

Answer

180 A

Question 29

You use a 1200 W toaster oven to cook a frozen pizza for 30 minutes. How much power did you use to cook the pizza (in kWh)?

Accepted Answer

0.6 kWh

Answer

600 kWh

Answer

1.2 kWh

Answer

36 000 kWh

Question 30

The efficiency of the fluorescent tube is

Accepted Answer

22%

Answer

0.22%

Answer

0.45

Answer

45%

Question 31

Electrical energy can be produced from other forms of energy, or it can be converted into other kinds of energy. The conversion in a battery is

Accepted Answer

chemical to electrical

Answer

chemical to mechanical

Answer

mechanical to electrical

Answer

kinetic to electrical

Question 32

To which part of the drill do you attach the bit?

Accepted Answer

Armature

Answer

Coil

Answer

Permanent magnet

Answer

Split-ring commutator

Question 33

Using this drill to make a hole in the wall is an example of converting

Accepted Answer

chemical energy to electrical energy and then to mechanical energy

Answer

chemical energy to potential energy and then to mechanical energy

Answer

electrical energy to thermal energy and then to electrical energy

Answer

electrical energy to kinetic energy and then to electrical energy

Question 34

How do you increase the speed of a motor?

Accepted Answer

add another battery

Answer

use fewer coils of wire

Answer

replace the split ring commutator with contact brushes

Answer

replace the electromagnet with a permanent magnet

Question 35

The generator produces an electric current when a

Accepted Answer

coil of wire moves around a magnet

Answer

magnet moves across a static charge

Answer

static charge is built up through friction

Answer

build up of static charge is released

Question 36

A light bulb gives off 5J of useful light energy for every 100J of electrical energy used to make it work. What is the efficiency of the light bulb?

Accepted Answer

5%

Answer

100%

Answer

95%

Answer

20%

Question 37

To generate electrical energy in a coal power plant, coal is burned to produce steam that turns a ________:

Accepted Answer

turbine

Answer

transformer

Answer

generator

Answer

condenser

Question 38

In science class, you learned that approximately 20% of the world's electricity is produced by hydro-electric generators. In order to be viable, these generators must be placed across rivers with large volumes of water passing through them. How does a hydro-electric generator produce electricity?

Accepted Answer

A hydro-electric generator converts the energy of flowing water into electricity.

Answer

A hydro-electric generator produces electricity via chemical reactions involving water.

Answer

A hydro-electric generator splits the atoms of water particles to produce electricity.

Answer

A hydro-electric generator converts the energy of heated water into electricity.

Question 39

Electrical energy throughout the world is produced in vast amounts and in various ways. Worldwide, the majority of electrical energy is produced by

Accepted Answer

the burning of fossil fuels such as coal, oil, and natural gas

Answer

the movement of water through hydro-electric generators

Answer

the collection of geothermal energy from within the Earth

Answer

the splitting of atoms through the process of nuclear fission

Question 40

Sustainability means using resources at a rate that

Accepted Answer

can be maintained for future generations.

Answer

will eventually deplete them.

Answer

can generate more resources through re-generation.

Answer

will eliminate harmful waste.

Question 41

Which of the following set-ups should he use in order to conduct a fair test?

Accepted Answer

A and C only

Answer

B and C only

Answer

A, C and D only

Answer

A, B and D only

Question 42

What can be done to increase the number of pins that the magnets can attract?

Accepted Answer

I, III and IV only

Answer

I and IV only

Answer

II and III only

Answer

I, II, III and IV

Question 43

Arrange the circuits in order from the one with the brightest bulbs to the circuit with the least bright bulbs. (Bulbs and batteries in all the circuit are similar)?

Accepted Answer

D, C, A, B

Answer

A, C, D, B

Answer

B, C, A, D

Answer

C, B, A, D

Question 44

Which material was the best conductor?

Accepted Answer

W

Answer

X

Answer

Y

Answer

Z

Question 45

Which one of the following electrical circuits will produce all the results recorded in the table above?

Accepted Answer

Option C is correct

Answer

A.

Answer

B.

Answer

D.

Create a free account and access millions of resources

Similar Resources on Wayground

Popular Resources on Wayground

Discover more resources for Science