Physics GCSE paper 1 missed questions

Describe the difference between renewable and non-renewable energy resources [2]

Renewable is an energy resource which is replenished as it’s used whereas non-renewable is finite

Name three environmental impacts of wind turbines

• Visual pollution

• Noise pollution

• Much raw materials needed

• Low power output - many needed

• Harms birds

Why does the ammeter connected to an LED display 0.0 when dirrection of current switches direction?

LEDs have a large resistance in the reverse direction

Explain one environmental problem caused by emmision of carbon dioxide

Carbon dioxide is a greenhouse gas which causes global warming

Which wire is connected to the fuse in a three pin plug?

The live wire

What is the most appropriate size fuse rating for a fuse in a: 1. Television 2. Kettle 3. Microwave 4. Computer

1. 3A

2. 13A

3. 13A

4. 3A

Explain what happens to the current of a parallel circuit as branches are added [2]

New branches reduce total resistance while p.d remains constant, increasing current

Why does touching a static electricity generator cause hair to stand up on end? [3]

Electrons are transferred to hair, so it becomes negatively charged and like charges repel

What is an electric field?

A region around a charged object where another charged object experiences a force

How do you convert μC to C

μC / 1,000,000

Describe how a substances internal energy changes as it boils [3]

Potential energy of particles increases but kinetic energy remains constant, increasing internal energy

Explain how pressure in a container increases as a gas is heated [4]

kinetic energy of gas particles increases, exerting a greater force on the walls each collision and increasing frequency of collisions of particles and walls, increasing pressure

What two measurements does a light gate use to calculate a moving object’s speed?

• Time taken to pass through beam

• Divided by length of object

What is meant by dissipated energy?

Any energy not transferred usefully

What is meant when describing a material as having a ‘high thermal conductivity’

Allows energy to be transferred between its particles rapidly

What are three ways that efficiency of energy transfer can be increased?

insulating, lubricating, streamlining

What is a system? What happens when it changes?

A system is one or more objects. When it changes, energy is transferred into or away from the system between objects or energy stores.

What is a closed system? What is the net change in total energy for a closed system?

A system where matter and energy cannot enter or leave. The net change in the total energy is always zero.

Explain why gloves which don’t stop hands becoming irradiated are worn when handling radioactive materials

Prevents contamination which would cause irradiation over a longer period

What radiation is emitted when the atomic number to decrease by one?

Beta radiation as neutron decays to proton and releases e- beta particle

Why is rolling dice a good model for radioactive decay? (2 reasons)

Cannot predict which dice will decay or when

What does a bulb glowing brighter indicatge?

A higher current is going through it, resulting in a higher power output

Which direction do magnetic field lines point and which way do electric field lines point?

Magnetic - north to south

Electric - positive to negative

Explain how an uncharged object may become positively charged [3]

Negatively charged electrons are transferred to the neutral object

What is the main way a motor loses wastes energy?

Heating surroundings

What are two reasons why the National grid caps power stations at 33% of max output?

• Spare capacity in case of power station emergency shut-down

• Conserves fuel reserves