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Electrical system

Total questions: 80

Worksheet time: 40mins

Name
Class
Date
1.

What is the unit of Electrical Power?

a)

Joule

b)

Watt

c)

Where

d)

Amp

2.

The unit of energy is?

a)

Amp

b)

Joule

c)

kiloWatt

d)

Volt

3.

A kilowatt (kW) is how many watts?

a)

10

b)

50

c)

100

d)

1000

4.

The unit of electricity is...

a)

KiloWatt-Hour (kWh)

b)

Watt

c)

Joule

d)

Amp

5.
What is the power of a 20V bulb with 5A through it?
a)
100W
b)
100V
c)
6.3W
d)
6.3A
6.
Electrical power can be calculated using
a)
Resistance x Voltage
b)
Voltage x Current 
c)
Voltage ÷ Current
7.
Watts is the same as...
a)
Joules per second
b)
Voltage per second
c)
Current per second
8.

An electric current can produce

a)

heating effect only.

b)

chemical effect only.

c)

magnetic effect only.

d)

chemical, heating, and magnetic effects.

9.

Which of the following metals is used in electroplating to make objects appear shining?

a)

iron

b)

aluminium

c)

copper

d)

chromium

10.

Tick the chemical effect of elecric current

a)

boiling

b)

motion

c)

electro shock

d)

Electroplating

11.

LED stands for

a)

light emitting diode

b)

light efficient diode

c)

length emitting diode

d)

light emitting device

12.

Substances that conduct electricity are called (a)   .

13.

Substances that do not conduct electricity are called (a)   .

14.

The electrode thats connected to the positive terminal of the battery is called a

a)

anode

b)

cathode

c)

elctrode

15.

The object to be electroplated is taken as ____________ electrode.

a)

cathode

b)

anode

c)

electrode

d)

none of these

16.

Small amount of a mineral salt present naturally in water makes it a______________ of electricity.

a)

insulator

b)

conductor

c)

both a and b

d)

none of these

17.

Electroplating is based on

a)

Chemical effect of electricity

b)

Magnetic effect of electricity

c)

Heating effect of electricity

d)

Physical effect of electricity

18.

An electrolyte is

a)

a metal

b)

a solution

c)

a liquid that conducts current

d)

all of above

19.

Flow of electron is called

a)

Electroplating

b)

Electric current

c)

Electrodes

d)

Electrolyte

20.

The phenomenon of decomposition of an electrolyte when electricity is passed through is known as

a)

conduction

b)

coating

c)

electrolysis

d)

electrorefining

21.

Conductors can allow electricity because of the presence of _________________.

a)

free ions

b)

free electrons

c)

free protons

d)

atoms

22.

Sea water is an example of _______________.

a)

bad conductor

b)

strong electrolyte

c)

weak electrolyte

d)

none of these

23.

The method of purification of metals by using electricity is known as ___________________.

a)

electroplating

b)

electrorefining

c)

electrometal

d)

none of these

24.

Electroplating prevents

a)

electric current

b)

chemical effect

c)

lightening

d)

rusting

25.

Which of the following is a good electrical conductor

a)

Graphite

b)

Silicon

c)

Phosphorus

d)

Carbon

26.

The production of a chemical reaction by passing an electric current through an electrolyte is called __________

a)

Electricity

b)

Electrolytic

c)

Circuit

d)

Electrolysis

27.

Which of these is a non metal ?

a)

Aluminium

b)

Fluorine

c)

Platinum

d)

Tin

28.

Electrolysis is used in refining of __________ metals

a)

Pure

b)

Non

c)

Impure

d)

Liquid

29.

Anode is

a)

Object to be electroplated

b)

Metal for coating

c)

Impure metal

d)

Solution to be deposited

30.

What is the green insulated wire known as?

a)

live wire

b)

earth wire

c)

neutral wire

31.

Which of the following represents properties of a fuse wire?

a)

high resistance and high melting point

b)

high resistance and low melting point

c)

low resistance and high melting point

32.
a)
Danger of Death
b)
Harmful or Irritant
c)
Biohazard
d)
High Voltage
33.

Electricity is a from of what?

a)

Fire

b)

Energy

c)

Heat

d)

Magnetism

34.
  1. Harm caused by electricity
a)

shock or electrocution

b)

slips, falls

c)

cuts, wounds

d)

silicosis

35.

Which type of circuit is shown in the diagram?

a)

combination circuit

b)

series circuit

c)

parallel circuit

d)

open circuit

36.

What is meant by voltage?

a)

rate of flow of electric charges

b)

opposes flow of current

c)

energy needed to move one unit of electric charge between 2 points

37.

This is the circuit symbol of a

a)

fuse

b)

fixed resistor

c)

variable resistor

d)

buzzer

38.

Which type of circuit is shown in the diagram?

a)

parallel circuit

b)

open circuit

c)

combination circuit

d)

series circuit

39.

in which circuit will the light bulb be the brightest?

a)

1

b)

2

c)

3

d)

All has bulbs with the same brightness

40.

When one light bulb is broken, all the other light bulbs will not light up.

In which of the following circuit will this happen?

a)
b)
c)
41.

What can be the danger caused by the action shown in the diagram? (can be more than one answer)

a)

electrical fire

b)

overheating of cables

c)

electric shock

d)

insulation of wires become damaged

42.

The wire in a fuse will melt when the

a)

current is larger than the fuse rating

b)

current is smaller than the fuse rating

c)

voltage is too large

d)

voltage is too small

43.

What is missing in the 3-pin plug?

a)

Live wire

b)

Earth wire

c)

Neutral wire

d)

Fuse

44.

How does a circuit breaker works?

a)

Circuit breaker will cause the current to flow from live wire to earth.

b)

Circuit breaker will melt when the current is too large.

c)

Circuit breaker will 'trip' and cut off electricity supply when the current is too small.

d)

Circuit breaker will 'trip' and cut off electricity supply when the current is too large.

45.

Safe or dangerous?

a)

safe

b)

dangerous

46.

Safe or dangerous?

a)

safe

b)

dangerous

47.

One rule for using electricity is.....

a)

It is OK to iron and use your phone.

b)

Too many plugs at a time in one socket.

c)

Touch electrical items with wet hands.

d)

Never leave a plug near water.

48.

What is dangerous when mixed together?

a)

magnets and electricity

b)

water and electricity

c)

water and magnets

49.

What happens if a circuit is overloaded?

a)

a fire may start

b)

a fuse will be blown

c)

electrical devices on the circuit will short out and possibly be destroyed

d)

all of the above

50.
This is the symbol for a _____?
a)
switch
b)
light 
c)
battery
d)
wires
51.
This is the symbol for a _____?
a)
an AC current source
b)
a DC current source
c)
a battery
d)
a single cell
52.

What is the component labelled A?

a)

Battery

b)

Bell

c)

Light bulb

d)

Switch

53.

What is the component labelled B?

a)

Battery

b)

Bell

c)

Light bulb

d)

Switch

54.

Which component does the symbol represents?

a)

battery

b)

fixed resistor

c)

variable resistor

d)

fuse

55.

Which component does the symbol represents?

a)

battery

b)

fixed resistor

c)

variable resistor

d)

fuse

56.

Which component does the symbol represents?

a)

battery

b)

fixed resistor

c)

variable resistor

d)

fuse

57.

Which component does the symbol represents?

a)

ammeter

b)

battery

c)

voltmeter

d)

bulb

58.

Which component does the symbol represents?

a)

ammeter

b)

battery

c)

voltmeter

d)

bulb

59.

Which quantity can be measured by this instrument?

a)

charge

b)

resistance

c)

current

d)

potential difference

60.

Which quantity can be measured by this instrument?

a)

charge

b)

resistance

c)

current

d)

potential difference

61.

Which is the correct arrangement for this meter to work?

a)

series

b)

parallel

c)

series-parallel

62.

Which is the correct arrangement for this meter to work?

a)

series

b)

parallel

c)

series-parallel

63.

Which component does the symbol represents?

a)

battery

b)

capacitor

c)

earth connector

d)

resistor

64.

It is a component of electric circuit that provides electrical energy .

a)

battery

b)

light bulb

c)

wire

d)

switch

65.

It connects the components of electrical circuit.

a)

light bulb

b)

battery

c)

wire

d)

switch

66.

It gives off light and heat when electricity flows through it.

a)

battery

b)

wire

c)

switch

d)

light bulb

67.

Name the symbol in the picture

a)

battery

b)

switch

c)

light bulb

d)

wire

68.

Name the symbol in the picture

a)

battery

b)

switch

c)

light bulb

d)

wire

69.

Name the symbol in the picture

a)

battery

b)

switch

c)

light bulb

d)

wire

70.

What type of circuit is shown in the picture?

a)

open circuit

b)

closed circuit

c)

light bulb

d)

wire

71.

What type of circuit is shown in the picture?

a)

open circuit

b)

closed circuit

c)

light bulb

d)

wire

72.

What is the another name for open circuit?

a)

incomplete circuit

b)

complete circuit

73.

What is the another name for closed circuit?

a)

incomplete circuit

b)

complete circuit

74.

If the earth wire is damaged...

a)

The user will suffer from electric shock

b)

The appliance won't work

c)

The appliance will overheat

75.

What colour is the live wire in a three pin plug?

a)

brown

b)

Blue

c)

Green and yellow

76.

What colour is the neutral wire in a three pin plug

a)

brown

b)

Blue

c)

Green and yellow

77.

What colour is the earth wire in a three pin plug

a)

brown

b)

Blue

c)

Green and yellow

78.

Which label points to the Fuse on the diagram?

a)

C

b)

D

c)

E

d)

F

79.

The longest pin on a three pin plug is known as the earth pin

a)

True

b)

False

80.

Oven normally use

a)

Two pin plug

b)

Three pin plug

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