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Principles of Electricity

Total questions: 38

Worksheet time: 19mins

Name
Class
Date
1.

What is the definition of an 'atom' and its constituent particles?

a)

The smallest unit of a chemical element, consisting of protons, neutrons, and electrons.

b)

A large molecule made up of smaller molecules.

c)

A type of chemical bond between atoms.

d)

A form of energy that can be stored in chemical bonds.

2.

How does atomic size relate to conductivity?

a)

Larger atomic size generally increases conductivity.

b)

Smaller atomic size generally increases conductivity.

c)

Atomic size has no effect on conductivity.

d)

Atomic size only affects thermal conductivity.

3.

Why is copper a preferred material in the electrical industry?

a)

It is the cheapest metal available.

b)

It has high electrical conductivity and is durable.

c)

It is the lightest metal.

d)

It is resistant to corrosion.

4.

What is the difference between electron flow and conventional current?

a)

Electron flow is in the same direction as conventional current.

b)

Electron flow is opposite to the direction of conventional current.

c)

Electron flow is faster than conventional current.

d)

Electron flow is slower than conventional current.

5.

Define 'conductor' and 'insulator' and provide examples.

a)

A conductor allows electricity to flow easily; an insulator does not. Examples: copper (conductor), rubber (insulator).

b)

A conductor does not allow electricity to flow; an insulator does. Examples: rubber (conductor), copper (insulator).

c)

Both conductors and insulators allow electricity to flow easily. Examples: copper and rubber.

d)

Neither conductors nor insulators allow electricity to flow. Examples: wood and plastic.

6.

Identify the three primary effects of an electric current.

a)

Thermal, chemical, and magnetic effects.

b)

Thermal, optical, and gravitational effects.

c)

Chemical, optical, and gravitational effects.

d)

Magnetic, optical, and thermal effects.

7.

Explain how each of the effects manifests in the flow of electricity.

a)

Thermal effect causes heating, chemical effect causes chemical reactions, magnetic effect creates magnetic fields.

b)

Thermal effect creates magnetic fields, chemical effect causes heating, magnetic effect causes chemical reactions.

c)

Thermal effect causes chemical reactions, chemical effect creates magnetic fields, magnetic effect causes heating.

d)

Thermal effect creates light, chemical effect causes sound, magnetic effect creates heat.

8.

What are the tiny particles that make up matter called?

a)

Atoms

b)

Molecules

c)

Cells

d)

Compounds

9.

What are molecules made up of?

a)

Cells

b)

Electrons

c)

Atoms

d)

Protons

10.

What is the charge of protons found in the nucleus of an atom?

a)

Positively charged

b)

Negatively charged

c)

Neutrally charged

d)

No charge

11.

What particles orbit the nucleus of an atom?

a)

Protons

b)

Neutrons

c)

Electrons

d)

Photons

12.

In an electrically neutral atom, what is the relationship between protons and electrons?

a)

More protons than electrons

b)

More electrons than protons

c)

Equal number of protons and electrons

d)

No protons or electrons

13.

How many protons and electrons does a hydrogen atom have?

a)

1 proton and 1 electron

b)

2 protons and 2 electrons

c)

92 protons and 92 electrons

d)

1 proton and 2 electrons

14.

What is the number of protons and electrons in a uranium atom?

a)

1 proton and 1 electron

b)

2 protons and 2 electrons

c)

92 protons and 92 electrons

d)

92 protons and 2 electrons

15.

How many protons and electrons are present in a helium atom?

a)

1 proton and 1 electron

b)

2 protons and 2 electrons

c)

92 protons and 92 electrons

d)

1 proton and 2 electrons

16.

How many protons does a copper atom have?

a)

28

b)

29

c)

30

d)

31

17.

Why is the outer electron of a copper atom loosely attached?

a)

Due to its proximity to the nucleus

b)

Due to its distance from the nucleus and repulsion from inner electrons

c)

Because it is heavier than other electrons

d)

Because it is closer to other atoms

18.

What happens to the outer electron of a copper atom that makes it significant for conductivity?

a)

It becomes a proton

b)

It can easily be detached, creating free electrons

c)

It merges with the nucleus

d)

It becomes a neutron

19.

What does a battery provide that causes electrons to flow from the negative terminal to the positive terminal?

a)

Electromotive force (EMF)

b)

Gravitational force

c)

Magnetic force

d)

Thermal energy

20.

What is necessary for electron flow in a circuit?

a)

A complete circuit

b)

A broken circuit

c)

A single wire

d)

A closed switch only

21.

What characteristic of conductors allows for easy electron flow?

a)

Tightly bound outer electrons

b)

Loosely attached outer electrons

c)

High resistance to electron flow

d)

Lack of outer electrons

22.

Which of the following is generally a good conductor?

a)

Rubber

b)

Glass

c)

Copper

d)

Diamond

23.

What is a common property of insulators?

a)

They have loosely attached outer electrons

b)

They allow easy electron flow

c)

They have tightly bound outer electrons

d)

They are made of metals

24.

Which of the following is an example of an electrical insulator?

a)

Silver

b)

Sea water

c)

Oil

d)

Steel

25.

What happens when electric current flows through a conductor?

a)

The conductor cools down.

b)

The conductor heats up.

c)

The conductor changes color.

d)

The conductor becomes magnetic.

26.

What is the effect called when a conductor heats up due to electric current?

a)

Magnetic effect of current

b)

Chemical effect of current

c)

Heating effect of current

d)

Cooling effect of current

27.

Which appliances utilize the heating effect of current?

a)

Refrigerators and air conditioners

b)

Toasters and light bulbs

c)

Fans and air purifiers

d)

Televisions and radios

28.

What is the process called when an electric current passes through certain liquids causing a chemical reaction?

a)

Combustion

b)

Electrolysis

c)

Fermentation

d)

Photosynthesis

29.

What is one of the uses of electrolysis?

a)

Painting objects

b)

Electroplating objects with metals like copper or silver

c)

Melting metals

d)

Cooling liquids

30.

What does an electric current create around a conductor?

a)

A magnetic field

b)

A gravitational field

c)

A sound wave

d)

A light beam

31.

In which devices is the magnetic effect of electric current commonly used?

a)

Electromagnets and motors

b)

Solar panels and batteries

c)

Light bulbs and heaters

d)

Televisions and radios

32.

What are the fundamental building blocks of matter?

a)

Molecules

b)

Atoms

c)

Compounds

d)

Mixtures

33.

What occurs when the number of protons equals the number of electrons in an atom?

a)

Electrical neutrality

b)

Ionization

c)

Polarization

d)

Magnetization

34.

Why is copper considered a good conductor?

a)

It has a high melting point

b)

It has a loosely attached outer electron

c)

It is a dense metal

d)

It is resistant to corrosion

35.

What is required to cause electrons to flow in a specific direction?

a)

Thermal energy

b)

Electromotive force (EMF)

c)

Chemical reaction

d)

Magnetic field

36.

What is the effect of electric current in heating appliances?

a)

Chemical effect

b)

Magnetic effect

c)

Thermal effect

d)

Optical effect

37.

What is electrolysis?

a)

A process of magnetization

b)

A chemical reaction caused by electric current

c)

A method of heat transfer

d)

A type of electrical insulation

38.

What generates magnetic fields?

a)

Static charges

b)

Movement of electric charges

c)

Chemical reactions

d)

Thermal energy