Paper 1

Question 1

Specific heat capacity

Answer 1

The amount of energy required to heat 1kg of a substance by 1 degree Centigrade

Question 2

Power is

Answer 2

The rate at which energy is transferred to another form of energy

Question 3

A Watt is

Answer 3

the unit of power and is equal to one Joule transferred in one second

Question 4

Conservation of Energy

Answer 4

Energy cannot be created or destroyed but can be transferred, stored or dissipated to less useful form like heat and sound

Question 5

In a closed system the overall amount of energy cannot

Answer 5

Change

Question 6

High thermal conductivity means

Answer 6

that an object is a good conductor

Question 7

Renewable resources are

Answer 7

ones that are being replenished as it is being used

Question 8

Non renewable resources are

Answer 8

ones that are being used faster than they are being replenished and so will run out

Question 9

Non renewable resources list (4)

Answer 9

coal, oil, gas and nuclear

Question 10

Reliable resources

Answer 10

can produce electricity at anytime

Question 11

Current is

Answer 11

the flow of charge, measured in Amps or A

Question 12

In a series circuit current is

Answer 12

the same at any point in the circuit

Question 13

In a parallel circuit current is

Answer 13

split between the branches (or loops)

Question 14

Series circuits contain

Answer 14

only one loop

Question 15

Parallel circuits contain

Answer 15

more than one loop (or branch)

Question 16

Linear circuits produce this type of I/V graph

Answer 16

Straight line graph

Question 17

Non Linear circuits produce this type of I/V graph

Answer 17

Curved

Question 18

In a series circuit the Total Resistance of the circuit is equal to

Answer 18

the sum of all resistances in the circuit

Question 19

In a parallel circuit the Total Resistance is

Answer 19

always less than the smallest resistor in the circuit

Question 20

In a series circuit the battery voltage is

Answer 20

shared between the devices in the circuit

Question 21

In parallel circuits the voltage across devices is

Answer 21

always equal to the battery voltage

Question 22

Direct current, DC

Answer 22

is current that flows in one direction only

Question 23

Alternating current AC

Answer 23

comes from plugs and constantly switches direction of flow

Question 24

Mains supply is

Answer 24

230 Volts and 50 Hz frequency

Question 25

3 core cables have

Answer 25

live, earth and neutral wires

Question 26

2 core cables have

Answer 26

Live and Neutral wires

Question 27

Plastic devices don’t need an Earth wire because

Answer 27

plastic doesn’t conduct electricity

Question 28

Live wire is

Answer 28

Brown

Question 29

Earth wire is

Answer 29

yellow/green

Question 30

Neutral wire is

Answer 30

Blue

Question 31

Fuses are used to protect devices from

Answer 31

High current

Question 32

Fuses and Earth wires are used to

Answer 32

protect the user from electric shock

Question 33

Voltage of live wire

Answer 33

230V

Question 34

Voltage of Neutral wire

Answer 34

0V

Question 35

Electrical devices transfer

Answer 35

electrical energy to other forms of energy

Question 36

Work done is always equal to

Answer 36

the amount of energy transferred

Question 37

National Grid is

Answer 37

a system of cables and transformers that connect power stations to homes

Question 38

Step up transformers

Answer 38

increase voltage and lower current to make energy transfer more efficient (less heating of wires)

Question 39

Step down transformers

Answer 39

decrease voltage and increase current

Question 40

Internal Energy is

Answer 40

the energy stored inside a systems particles in the form of kinetic and potential energy of the particles themselves

Question 41

Heating increases

Answer 41

Internal energy

Question 42

Increases in internal energy can

Answer 42

cause temperature rise or change of state

Question 43

Latent heat is

Answer 43

the energy needed to change the state of a substance without changing the temperature

Question 44

Latent heat of fusion is

Answer 44

the energy needed to change a solid into a liquid

Question 45

Latent heat of vaporisation is

Answer 45

the energy needed to change a liquid to a gas

Question 46

Pressure of a gas is caused by

Answer 46

particles colliding with the surface of the container and pushing on it

Question 47

Size of atoms (radius)

Answer 47

1 x 10-10m

Question 48

Nuclei are smaller than atoms by this many times

Answer 48

10,000 times smaller

Question 49

Mass number

Answer 49

is the total number of protons AND neutrons in the nucleus

Question 50

Atomic number

Answer 50

The number of protons in an nucleus

Question 51

Isotopes

Answer 51

elements that can have different numbers of neutrons but same number of protons

Question 52

Ions

Answer 52

atoms that have lost or gained outer shell electrons

Question 53

Radioactive decay is

Answer 53

a random process

Question 54

Alpha particles

Answer 54

contain 2 neutrons and 2 protons

Question 55

Beta Particles

Answer 55

High speed electrons from nucleus

Question 56

Gamma rays

Answer 56

High energy Electromagnetic waves

Question 57

Half life

Answer 57

the time it takes for a samples activity or count rate to fall to half of its original value

Question 58

The rate at which radiation is emitted is called

Answer 58

Activity

Question 59

Radiation is emitted from

Answer 59

Unstable Nuclei

Question 60

Thermistor’s resistance decreases when

Answer 60

temperature increases

Question 61

LDR’s resistance decreases

Answer 61

as light intensity increases