Physics Paper 1 (Content)

Question 1

What is half-life?

Answer 1

Time it takes for the count rate of a radioactive substance to halve

Question 2

What is direct potential difference?

Answer 2

• Also known as DC
• One directional current flow

Question 3

What is alternating potential difference?

Answer 3

• Also known as AC
• A continually oscillating current flow which which results in the potential difference across two points continually oscillating between
  a positive and negative value.

Question 4

What is this symbol?

Answer 4

Thermistor

Question 5

What do we need for charge to flow?

Answer 5

• Circuit must be closed (No open switches)
• Must be a source of potential difference (Battery/Cell)

Question 6

What is the definition of specific heat capacity?

Answer 6

The energy required to increase the temperature of 1kg of water by 1^oC

Question 7

What is current?

Answer 7

The flow of electrical charge

Question 8

What is this electrical component?

Answer 8

Fuse

Question 9

Explain why changing state is a physical change and not a chemical change.

Answer 9

Changes of state are physical changes not chemical changes because the substance recovers its original properties if the
change is reversed

Question 10

Why is water changing to steam a physical change?

Answer 10

Water will recover its original properties if the steam is cooled

Question 11

What is work done?

Answer 11

The energy transferred when a force acts over a distance

Question 12

What is the national grid?

Answer 12

The network of power stations, transformers, and cables that connects consumers to power stations

Question 13

What is resistance?

Answer 13

A measure of the opposition to current flow

Question 14

What is the electrical component?

Answer 14

A cell

Question 15

How many Amps in mA?

Answer 15

1000mA = 1 A (Amp)

Question 16

What is amperes?

Answer 16

Amps = unit of current

Question 17

What is nuclear fusion?

Answer 17

Nuclear fusion is the joining together of nuclei

During nuclear fusion the total mass of the particles increase (becomes heavier)

Question 18

What is nuclear fission?

Answer 18

An unstable nucleus absorbs a neutron and splits into two parts

Two or three neutrons are released as well as energy and gamma rays

Question 19

What stops gamma radiation?

Answer 19

A few cm of lead

Question 20

What is a gamma ray?

Answer 20

• = neutron (n)
• Electromagnetic radiation from the nucleus

Question 21

What is sublimates (sublimation)?

Answer 21

Changing from solid to gas

Question 22

What are the units for resistance?

Answer 22

Ohms Ω

Question 23

What are the units for potential difference?

Answer 23

Volts

Question 24

What are the units for energy?

Answer 24

Joules (J)

Question 25

What are the units for current?

Answer 25

Amps (A)

Question 26

What is this electrical component?

Answer 26

LDR Light-dependent Resistor

Question 27

What is this electrical component?

Answer 27

Diode

Question 28

What is this electrical component?

Answer 28

Resistor

Question 29

What is this electrical component?

Answer 29

Variable resistor

Question 30

What is this electrical component?

Answer 30

LED Light emitting Diode

Question 31

What is a step-up transformer?

Answer 31

Device that increases the potential difference generated by a power station so that electrical power transmitted along the transmission cables is at higher potential

Question 32

What is this electrical component?

Answer 32

Battery

Question 33

What is a spring constant?

Answer 33

A measure of a springs stiffness The greater the number the more force needed to stretch or compress a spring by a given distance

Question 34

What is a step down transformer?

Answer 34

Device found between the transmission cables and consumer that lowers the potential difference of the power stations so it is at safe usable levels

Question 35

What is a thermistor?

Answer 35

A temperature dependent component whose resistance increases as temperature decreases

Question 36

What is power?

Answer 36

* The rate at which energy is transferred * Or the rate at which work is done

Question 37

What stops beta radiation?

Answer 37

A few sheets of aluminium

Question 38

What stops alpha radiation?

Answer 38

Piece of paper

Question 39

What is pressure measured in?

Answer 39

Pascals (Pa) 1000 Pa = 1KPa (kilopascals)

Question 40

What is the point of a live wire?

Answer 40

Live wire carries alternating potential difference from the supply

Question 41

What is the point of the neutral wire?

Answer 41

Neutral wire completes the circuit

Question 42

What is the point of an earth wire?

Answer 42

Safety wire to stop appliances becoming live

Question 43

What are the colours of each wire of the 3 core cable?

Answer 43

* Live wire = Brown * Neutra wire = Blue * Earth wire = Green and Yellow Stripes

Question 44

How are ammeters connected in a circuit?

Answer 44

In series

Question 45

How are voltmeters connected in a circuit?

Answer 45

In parallel

Question 46

Which one of these is the lightbulb connected in series and which one is light connected in parallel?

Answer 46

LEFT = In series (on the same wire) RIGHT = In parallel (on a different wire)

Question 47

Which one of these is the lightbulb connected in series and which one is light connected in parallel?

Answer 47

LEFT = In parallel RIGHT = In series

Question 48

What is the units for extension?

Answer 48

Extension is a length **(m) - metres**