Flashcards
AQA GCSE Additional Science - Physics Questions
Flashcards do conjunto (39)
- 1Which appliances need earthing?Appliances with metal cases
- 2Describe 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
- 3Name the 3 types of radiationalpha, beta and gamma
- 4Which type of radiation is most penetrating?gamma
- 5Which type of radiation is most ionising?alpha
- 6Which type(s) of radiation are affected by magnetic fields?alpha and beta
- 7List the types of radiation in order of speed (fastest to slowest)gamma, beta, alpha
- 8What is the potential difference of the mains electricity supply in the UK?230 Volts
- 9What is the frequency of the mains electricity supply in the UK?50 Hertz
- 10Describe the forces in a star in the Main Sequencebalanced
- 11What stage of a star happens after Main Sequence for a star like the SunRed Giant
- 12Describe the possible end of a star much bigger than the SunNeutron star or black hole
- 13Describe the action of a fuseIt melts when too much current passes through it
- 14What is meant by 'direct current'Current passes in one direction only
- 15What is meant by 'alternating current'Current is constantly reversing direction
- 16Describe the structure of a 3 pin plugPlastic case
Brass pins
Plastic cable grip
Fuse of correct value - 17Describe the structure of a 3 core cableLive, neutral and earth wires which are insulated
Live = brown
Neutral = blue
Earth = green + yellow - 18Explain how earthing protects users of appliances with metal casesHigher than normal current passes
from live to earth
Fuse melts
Breaking the circuit
Stopping the case being live - 19What is meant by 'power'The rate of energy transfer
- 20P = E / t P = power, E = energy, t = time State the correct unitsP = Watts
E = Joules
t = seconds - 21P = I x V P = power, I = current, V = potential difference State the correct unitsP = Watts
I = Amps
V = Volts - 22E = V x Q E = energy, V = potential difference, Q = charge State the correct unitsE = Joules
V = Volts
Q = Coulombs - 23Describe the structure of an atomNucleus consisting of protons and neutrons, orbiting electrons
- 24State the charges of the components of an atomProtons = +1
Neutrons = 0
Electrons = -1 - 25State two sources of background radiationNuclear weapons testing
Cosmic rays - 26What is an ion?An atom that has lost / gained an electron
- 27What is an isotope?An atom with the same number of protons, but a different number of neutrons
- 28What is an alpha particle?2 protons, 2 neutrons
- 29What is a beta particle?A high speed electron
- 30What is a gamma ray?Electromagnetic radiation
- 31Why are alpha, beta and gamma radiation dangerous?They ionise atoms, which damages cells and causes cancer
- 32What is meant by 'half life'?The time it takes for the radiation emitted by a source to reach half the original level
- 33What is nuclear fusion?The joining together of two light nuclei with the release of energy
- 34What is nuclear fission?The splitting of a nucleus by absorbing a neutron with the release of energy (and 2 or 3 neutrons)
- 35Name a nuclear fuelUranium (235)
or
Plutonium (239) - 36What is meant by 'chain reaction'At least one neutron from a fission reaction goes on to cause a further fission
- 37For a star like the Sun, what stage comes before the white dwarf stage?Red Giant
- 38Elements heavier than iron are produced in which stage of a star's life cycle?Supernova
- 39Name one element that is formed in the core of a starHelium (could have anything up to iron)
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- AQA GCSE Additional Science - Physics Questions
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- Michael Priest
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