Physics

Question 1

What is an insulator?

Answer 1

It is a substance which does not allow electricity to pass through.

Question 2

What subatomic particle is responsible for electrostatic charge?

Answer 2

Electrons are responsible.

Question 3

What is an electrical conductor?

Answer 3

A material which allows electricity to pass through.

Question 4

What is the difference between AC and DC current?

Answer 4

DC - current that is always in the same direction.
AC - current that repeatedly changes direction.

Question 5

What is electrical charge measured in?

Answer 5

Charge or Q is measured in coulombs, C.

Question 6

What are properties of magnetics?

Answer 6

They have two poles.
Like poles repel
Opposite poles attract
Forces are strongest the closer the magnetics are.

Question 7

What’s the formula for current?

Answer 7

Charge Q / Time T

Question 8

What’s the formula for resistance?

Answer 8

Voltage / Current

Question 9

Define resistance.

Answer 9

It is the measure of the opposite to current flow in an electrical circuit.

Question 10

Describe a soft magnetic material

Answer 10

Easy to magnetise but easy to demagnetise.

Question 11

Describe a hard magnetic material

Answer 11

Hard to magnetise but hard to demagnetise.

Question 12

Name key points about magnetic fields.

Answer 12

Predicted using the right hand rule.
Fields can be controlled by controlling current.
Clockwise - South
Anti-clockwise - North

Question 13

Name some typical UK voltages.

Answer 13

Transformer - 11kw - 33kw
Transmisison - 275kv - 400kv
Consumer use - 230kv

Question 14

What is Faraday

Answer 14

Faraday represents 1 mole of electrons.
equal to 96,500 coulombs

Question 15

How do you calculate charged transferred?

Answer 15

Charge Q = Current I x time t

Question 16

Define charged transferred?

Answer 16

It is the amount of charge transferred during electrolysis.

Question 17

What values are needed to calculate the mass of a substance?

Answer 17

Charge transferred
Faraday
Ar or Mr

Question 18

What is the molar volume of gas?

Answer 18

It is 24dm3 or 24,000cm3

Question 19

Name the properties of all electromagnetic waves.

Answer 19

Travel in a vacuum
Emit energy via radiation
Travel at the same speed in vacuum

Question 20

What are the properties of long wavelengths?

Answer 20

low frequency
Low energy

Question 21

What are the properties of short wavelengths?

Answer 21

High frequency
High energy

Question 22

What does this mean?
Roman
Men
Invent
Very
Unusual
X-Ray
Guns

Answer 22

Radio waves
Micro waves
Infrared
Visible Light
Ultraviolet
X-Ray
Gamma

Question 23

What’s the difference between red light and violet light?

Answer 23

Red light is the lowest frequency of visible light
Violet is the highest frequency of visible light.

Question 24

What’s the difference between mass and weight?

Answer 24

Mass is a measure of the resistance of an object to acceleration.
Weight is a force of gravity acting on an object.

Question 25

What's Newton's second law?

Answer 25

Force = Mass * acceleration

Question 26

What's the formula for acceleration?

Answer 26

Change in velocity / time

Question 27

What's the formula for velocity?

Answer 27

Change in displacement / time

Question 28

What's the formula for speed?

Answer 28

Distance / time

Question 29

Define the term half-life.

Answer 29

Means the average time taken for half the nuclei in a sample of an isotope to decay.

Question 30

Name the hazards if ionising radiation.

Answer 30

Can damage human tissue. Damage DNA Damage plant cells Radiation poisoning.

Question 31

How to calculate the speed of wavelengths?

Answer 31

First need velocity = wavelength * frequency. Then divide the distance of the medium with the velocity to get speed.

Question 32

Define an isotope

Answer 32

Each element can exist as more than one possible nucleotide. Nucleotide of the same element are known as isotopes.

Question 33

What's a nucleotide

Answer 33

Any type of nucleus. Characterised by the number of protons and neutrons it has.

Question 34

Define the process of loosing/gaining electrons.

Answer 34

Ionisation

Question 35

What kinds of radiation is emitted when nuclei decay?

Answer 35

Alpha Beta Gamma

Question 36

Describe the random nature of emissions.

Answer 36

Not possible to predict nuclei decay. No known cause. No way to make it happen sooner.

Question 37

What are the relative charges of the three types of radiation?

Answer 37

Alpha - +2 Beta - -1 Gamma - 0

Question 38

Define penetrating ability of nuclear radiation.

Answer 38

How easily a type of radiation penetrates through materials.

Question 39

What is the penetrating ability of Beta radiation?

Answer 39

Blocked by thin material Not blocked by human skin Penetrates several meters in the air.

Question 40

What's the penetrating ability of gamma?

Answer 40

Requires centimetres of dense material like lead to block. Penetrate hundreds of metres in the air.

Question 41

What's the penetrating ability of alpha?

Answer 41

Blocked by sheet of paper. Blocked by human skin Penetrate few centimetres in air.