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Electricity and reactions knowledge test

Total questions: 119

Worksheet time: 2hrs 15mins

Name
Class
Date
1.

All electricity is the result of electrical charge.

a)

True

b)

False

2.

What is static electricity?

a)

It flows in a wire.

b)

It is a build up of electrical charge.

3.

Which two pictures show static electricity? Choose 2.

a)
b)
c)
d)
4.

A _____________ is a path that is made of parts that work together to allow current to flow.

a)

Static electricity

b)

Circuit

c)

Insulator

5.

Which material is a conductor?

a)

Metal

b)

Plastic

c)

Rubber

6.

What is this in the picture?

a)

Plastic sticks

b)

Wires that carry electricity

c)

Skipping rope

7.

Which material is an insulator?

a)

Plastic

b)

Metal

c)

A spoon

8.

The region in which a magnetic force acts is called a

a)

line of force

b)

pole

c)

magnetic field

d)

field of attractio

9.

Unlike poles of different magnets

a)

attract each other

b)

cancel each other out

c)

repel each other

10.

Electromagnets can be

a)

turned on and off

b)

made stronger

c)

made from iron

d)

made weaker

11.

The magnetic field is strongest

a)

at the poles

b)

in the middle

c)

at the north pole

d)

at the south pole

12.

THe north end of a compass needle always points to

a)

our geographic north pole

b)

our geographic south pole

c)

our magnetic north pole

d)

our magnetic south pole

13.

Which of the following would be an example of an insulator?

a)

iron

b)

aluminum

c)

rubber

d)

silver

14.

The rule of charged particles states that

a)

opposites attract

b)

opposites repel

c)

opposites don't interact

d)

likes attract

15.

These are responsible for the flow of electricity

a)

protons

b)

electrons

c)

neutrons

d)

wires

16.
which two poles attract 
a)
north and south
b)
south and south
c)
north and east
d)
east and west
17.
what can be attracted to magnets?
a)
wood
b)
skin
c)
Metals such as iron, nickel and cobalt
18.
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
19.
What characteristics do magnetic substances have?
a)
They can give you a "shock" when you touch them
b)
They can push or pull objects without touching them
c)
They are always black and cold to touch
d)
They fall faster than other objects when you drop them
20.
A series circuit has ____ path(s) that the electric current can take. 
a)
One
b)
Two 
c)
Three 
d)
Four
21.
An object through which electrons can easily flow is called a(n) ___________.
a)
Conductor
b)
Insulator
22.
Which statement is true?
a)
The light bulb will light up because the  circuit is complete.
b)
The light bulb will light up because the  circuit is broken.
c)
The light bulb will not light up because the  circuit is complete.
d)
The light bulb will not light up because the  circuit is broken.
23.
What is an electromagnet?
a)
a temporary magnet made from current carrying wire around a magnetic metal core.
b)
a permanent magnet with a north and south pole
24.
This is a picture of a simple electromagnet. How can the electromagnet be made stronger?
a)
Add more coils of wire to the nail.
b)
Use a smaller battery.
c)
Reverse the poles of the magnet.
d)
Remove all the coils and the nail.
25.
How are electromagnets different from magnets?
a)
magnets can be turned on/off
b)
you can turn an electromagnet on/off
c)
magnets are more powerful
d)
magnets have a North and South pole
26.
Surrounding every magnet is a __________  __________.
a)
magnetic field
b)
electrical current
c)
another magnet
d)
an enemy
27.

Which kind of electricity is safer: mains or cell electricity?

a)

mains

b)

cell

28.

Safe or dangerous?

a)

safe

b)

dangerous

29.

Safe or dangerous?

a)

safe

b)

dangerous

30.

Safe or unsafe?

a)

safe

b)

unsafe

31.

Safe or dangerous?

a)

Safe

b)

Dangerous

32.

Safe or dangerous?

a)

safe

b)

dangerous

33.
The picture shows an electrical circuit. This circuit is a series circuit because: 
a)
It has 3 light bulbs.
b)
The same current flows through all three light bulbs.
c)
It uses a single battery.
d)
The electrical current is divided between the three light bulbs.
34.
The total resistance in this circuit is 
a)
100 ohms
b)
450 ohms
c)
400 ohms
d)
30 ohms
35.
The total current through this circuit is
a)
0.02 amps
b)
0.09 amps
c)
50 amps
d)
9 amps
36.
As resistors are added in series to a circuit, the total resistance will...
a)
increase
b)
decrease
c)
stay the same
37.
As the resistance of a circuit increases, the current will...
a)
increase
b)
decrease
c)
stay the same
38.
In a parallel circuit which of the following is the same value throughout the circuit?
a)
Voltage
b)
Current
c)
Resistance
d)
Charge
39.
Does this diagram represent a series or parallel circuit?
a)
series circuit
b)
parallel circuit
40.

What is the definition of electrical current?

a)

The opposition to the flow of electrons

b)

The rate of flow of charge

c)

The work done on each coulomb of charge

d)

Electrons moving around

41.

A series circuit has ____ path(s) that the electric current can take.

a)

One

b)

Two

c)

Three

d)

Four

42.

This is an example of a _______ circuit

a)

open

b)

series

c)

parallel

d)

switch

43.

What will happen if one light bulb is removed from this circuit?

a)

The other bulbs will go out.

b)

The other bulbs will stay on

c)

The other bulbs will get dimmer.

d)

The battery will become stronger.

44.

When you remove a bulb from a three bulb circuit, and the other two bulbs go off, then the bulbs must have been connected in __________.

a)

parallel

b)

series

c)

open

d)

closed

45.
Does this statement best describe a parallel or a series circuit.
 
When more light bulbs are added they all remain bright. 
a)
Parallel circuit
b)
Series circuit
46.
How many different types of circuits are there? 
a)
1
b)
3
c)
2
d)
4
47.
What kind of circuit is this?
a)
series
b)
parallel
48.
wood is a _____?
a)
conductor
b)
insulator
49.
A material in which electrons are not able to move easily 
a)
Circuit 
b)
Insulator 
c)
Resistance 
d)
Conductor
50.
this is the symbol for a _____?
a)
switch
b)
light 
c)
battery
d)
wires
51.
what is this symbol for?
a)
light bulb
b)
switch
c)
battery
d)
resistor
52.

This is the symbol for a...

a)

Thermistor

b)

Bulb

c)

Fixed Resistor

d)

Ammeter

53.

This is the symbol for a...

a)

Motor

b)

Ammeter

c)

Bulb

d)

Voltmeter

54.

This is the symbol for a...

a)

Light Dependent Resistor

b)

Light Emitting Diode

c)

Thermistor

d)

Cell

55.

This is the symbol for a...

a)

Bulb

b)

Voltmeter

c)

Ammeter

d)

Motor

56.

This is the symbol for a...

a)

Fuse

b)

Cell

c)

Fixed Resistor

d)

Variable Resistor

57.

This is the symbol for a...

a)

Battery

b)

Thermistor

c)

Motor

d)

Fuse

58.

This is the symbol for a...

a)

Thermistor

b)

Fixed Resistor

c)

Variable Resistor

d)

Fuse

59.

This is the symbol for a...

a)

Fixed Resistor

b)

Variable Resistor

c)

Light Dependent Resistor

d)

Fuse

60.

Electric current is measured in

a)

kWh

b)

Amps

c)

Ohms

d)

Watts

61.

Why are overheating cables a hazard?

a)

Could cause a fire

b)

Could cause a electrocution

c)

Could cause a shortcircuit

d)

Could melt the fuse

62.

A device that contains a thin strip of metal that melts easily if the current in the circuit is too high

a)

Fuse

b)

resistor

c)

earth wire

d)

battery

e)

diode

63.

Name that component. Type just one word. 4 letters.

(a)  

64.

Name the component

a)

ammeter

b)

voltmeter

c)

connector

d)

switch

65.

What does this component measure?

(a)  

66.

what does this component measure?

(a)  

67.

What could this component be?

a)

A light bulb

b)

A speaker

c)

A drawing pin

d)

A coffee maker on its side

68.

What particles move from atom to atom?

a)

Protons

b)

Neutrons

c)

Electrons

d)

Dust

69.

Particles with the same charge...

a)

they do nothing

b)

they tend to pull closer

c)

they tend to disappear

d)

they tend to pull apart

70.

What particles are found in the nucleus?

a)

Neutrons

b)

Protons and electrons

c)

Protons and neutrons

d)

Neutrons and electrons

71.

A buzzer transforms electrical energy into....

a)

sound

b)

movement

c)

heat

d)

light

72.

What does this symbol warn us about?

a)

Health hazard

b)

Lung disease

c)

Irritant

d)

Corrosive

73.

What does this symbol mean if found as a label on a substance?

a)

Flamable

b)

Flammable

c)

Set this on fire

74.

What does this symbol stand for?

a)

Flammable

b)

Oxidising

c)

Irritant

d)

Corrosive

75.

What does this symbol stand for?

a)

Flammable

b)

Toxic

c)

Deadly

d)

Corrosive

76.

What does this symbol warn us of?

a)

Danger

b)

Alert

c)

Toxic

d)

Irritant/harmful

77.

This symbol tell us the chemical it is labelling is:

a)

Harmful to the environment

b)

Dangerous

c)

Toxic

d)

Poisonous

78.

This symbol tell us the chemical it is labelling is:

a)

Harmful to the environment

b)

A pressurised container

c)

Explosive

d)

Corrosive

79.
What is the hazard shown in this hazard sign?
a)
Pikachu
b)
Lightning
c)
Electrical
d)
Fault
80.
What is the hazard shown in this hazard sign?
a)
Chemical spill
b)
Toxic
c)
Biohazard
d)
Death
81.
When is it OK to eat or drink in the lab?
a)
Always
b)
Never
82.
What should you do if you break glass in the lab?
a)
Tell the teacher.
b)
Sweep up the glass.
c)
Pick up the glass with your hands.
d)
Ignore it; the teacher will clean it up when she sees it later.
83.

It's fine to smell chemicals directly from their containers. nothing will happen to you.

a)

True

b)

False

84.

Carbon

a)

CA

b)

C

c)

Ca

d)

Cn

85.

Zinc

a)

Z

b)

Zi

c)

ZN

d)

Zn

86.

Neon

a)

N

b)

No

c)

Ne

d)

Nn

87.

Copper

a)

CU

b)

Cp

c)

Cu

d)

Cr

88.

Hydrogen

a)

Hy

b)

H

c)

Hr

d)

Hn

89.

N

a)

Sodium

b)

Nitrogon

c)

Nonium

d)

Nitrogen

90.

Gold

a)

Go

b)

Gl

c)

AU

d)

Au

91.

Pb

a)

Gold

b)

Lead

c)

peanut butter

d)

Paribium

92.

Iron

a)

Ir

b)

In

c)

Fe

d)

FE

93.

Iodine

a)

Ie

b)

I

c)

Id

d)

Io

94.

Mercury

a)

Me

b)

Hg

c)

HG

d)

ME

95.

Potassium

a)

P

b)

K

c)

Pt

d)

k

96.
What is the chemical symbol for the element oxygen
a)
O
b)
Oxy
c)
ox
d)
Oy
97.
What is the chemical symbol for the element Silver
a)
S
b)
Si
c)
Au
d)
Ag
98.
What is the chemical symbol for the element Chlorine
a)
C
b)
Cl
c)
cl
d)
Ch
99.
What two molecules are produced in a combustion reaction?
a)
CO2 + NH4
b)
SiO2 + H2O
c)
H2O + CO2
d)
CO2 + H2O2
100.
Is the reaction below exothermic or endothermic?
CH4 + 2O2 → CO2 + H2O + heat
a)
exothermic
b)
endothermic
101.

What type of reactions can able to change products back to the their original form?

a)

Reversible reactions

b)

Irreversible reactions

c)

Combustion reactions

d)

Combination reactions

102.

Which of the following changes is irreversible change?

a)

Melting of ice cube

b)

Heating hydrated CuSO4

c)

Frying an egg

d)

Thermal decomposing NH4Cl

103.

Which of the following combination is correct?

a)

reversible ⇌

irreversible →

b)

reversible ←

irreversible →

c)

reversible ⇌

irreversible ←

d)

irreversible ⇌

reversible →

104.

What is the symbol which is used in reversible reactions?

a)

→

b)

Δ

c)

+

d)

⇌

105.
This symbol indicates that a reaction is ____________
a)
reversible
b)
irreversible
106.
Which of these is NOT a reversible change?
a)
Water to Ice
b)
Juice to ice lolly
c)
Cookie Dough to Cookie
d)
Melting Chocolate
107.

What is a closed system

a)

It gives out energy

b)

The reactants and the products do not escape from reaction mixture

c)

It takes in energy

d)

The reactants and the products escape from he reaction mixture to be kept in the system

108.
When a scientist mixed two chemicals, an exothermic reaction takes place. Which of the following would be proof that the reaction was exothermic?
a)
a change of color
b)
a change of state
c)
a temperature decrease
d)
a temperature increase
109.
What types of reactions absorb and release heat?
a)
acidic and basic
b)
endothermic and exothermic
c)
endothermic and heat transfusion
d)
covalent and ionic
110.
In the reaction methane + oxygen turns into carbon dioxide + water, the methane and oxygen are called _______________.
a)
reactants
b)
products
c)
neutrals
d)
energizers
111.
A change in the shape of an object is an example of _________________.
a)
a chemical change
b)
energy
c)
an endothermic change
d)
a physical change
112.
What type of change occurs when a new substance is formed that has different properties from the original substances?
a)
chemical change
b)
nuclear change
c)
physical change
d)
mutation
113.
Increasing the concentration of a reactant in a chemical reaction will _____________.
a)
decrease the rate of the reaction
b)
stop the reaction from happening
c)
increase the rate of the reaction
d)
have no effect on the rate of the reacion
114.
Which of the following is a chemical change?
a)
the rusting of iron
b)
dissolving salt in water
c)
melting an ice cube
d)
bending a copper wire
115.
Which is an example of an endothermic reaction?
a)
burning wood
b)
airplane using fuel
c)
plant leaves using photosynthesis
d)
digesting food
116.
One of the signs of a chemical reaction taking place is:
a)
Bubbles are produced 
b)
Reactants are not combining
c)
Products are not forming
d)
Color is not changing
117.
Which of the following describes a precipitate?
a)
a liquid forms when a block of metal is heated
b)
a solid forms when one liquid is poured into another
c)
a gas forms when a solid is placed in a liquid
d)
bubbles form when an acid is poured on a rock
118.
Which is NOT an indication of a chemical change?
a)
temperature change
b)
formation of a precipitate
c)
shape change
d)
production of light
119.
You know you a chemical reaction has occurred if 
a)
there is a precipitate.
b)
there is a color change.
c)
there is a temperature change.
d)
All of these answers are evidence.

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