AQA GCSE Additional Science - Physics Questions

Michael Priest
Flashcards by , created over 4 years ago

AQA GCSE Additional Science - Physics Questions

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Michael Priest
Created by Michael Priest over 4 years ago
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Question Answer
Which appliances need earthing? Appliances with metal cases
Describe the action of a circuit breaker (RCCB) Difference in current between the live and neutral causes the circuit breaker to 'trip' and break the circuit
Name the 3 types of radiation alpha, beta and gamma
Which type of radiation is most penetrating? gamma
Which type of radiation is most ionising? alpha
Which type(s) of radiation are affected by magnetic fields? alpha and beta
List the types of radiation in order of speed (fastest to slowest) gamma, beta, alpha
What is the potential difference of the mains electricity supply in the UK? 230 Volts
What is the frequency of the mains electricity supply in the UK? 50 Hertz
Describe the forces in a star in the Main Sequence balanced
What stage of a star happens after Main Sequence for a star like the Sun Red Giant
Describe the possible end of a star much bigger than the Sun Neutron star or black hole
Describe the action of a fuse It melts when too much current passes through it
What is meant by 'direct current' Current passes in one direction only
What is meant by 'alternating current' Current is constantly reversing direction
Describe the structure of a 3 pin plug Plastic case Brass pins Plastic cable grip Fuse of correct value
Describe the structure of a 3 core cable Live, neutral and earth wires which are insulated Live = brown Neutral = blue Earth = green + yellow
Explain how earthing protects users of appliances with metal cases Higher than normal current passes from live to earth Fuse melts Breaking the circuit Stopping the case being live
What is meant by 'power' The rate of energy transfer
P = E / t P = power, E = energy, t = time State the correct units P = Watts E = Joules t = seconds
P = I x V P = power, I = current, V = potential difference State the correct units P = Watts I = Amps V = Volts
E = V x Q E = energy, V = potential difference, Q = charge State the correct units E = Joules V = Volts Q = Coulombs
Describe the structure of an atom Nucleus consisting of protons and neutrons, orbiting electrons
State the charges of the components of an atom Protons = +1 Neutrons = 0 Electrons = -1
State two sources of background radiation Nuclear weapons testing Cosmic rays
What is an ion? An atom that has lost / gained an electron
What is an isotope? An atom with the same number of protons, but a different number of neutrons
What is an alpha particle? 2 protons, 2 neutrons
What is a beta particle? A high speed electron
What is a gamma ray? Electromagnetic radiation
Why are alpha, beta and gamma radiation dangerous? They ionise atoms, which damages cells and causes cancer
What is meant by 'half life'? The time it takes for the radiation emitted by a source to reach half the original level
What is nuclear fusion? The joining together of two light nuclei with the release of energy
What is nuclear fission? The splitting of a nucleus by absorbing a neutron with the release of energy (and 2 or 3 neutrons)
Name a nuclear fuel Uranium (235) or Plutonium (239)
What is meant by 'chain reaction' At least one neutron from a fission reaction goes on to cause a further fission
For a star like the Sun, what stage comes before the white dwarf stage? Red Giant
Elements heavier than iron are produced in which stage of a star's life cycle? Supernova
Name one element that is formed in the core of a star Helium (could have anything up to iron)