P2b Quiz

Which one of these is the correct way to wire an ammeter and voltmeter?
1. The ammeter in parallel, and the voltmeter in series.
2. The voltmeter in parallel and the ammeter in series.
3. Both the ammeter and voltmeter in series
4. Both the ammeter and voltmeter in parallel
Which one of these is correct about a series circuit?
1. The current is the same all the way round, and the voltages add up to the battery voltage.
2. The currents add up to the battery current and the voltage is the same all the way round
3. The currents add up to the battery current and the voltages add up to the battery voltage.
4. The current and the voltage are the same all the way round.
Which one of these is correct about a parallel circuit?
1. Both the voltages and the currents add up to the battery voltage and current
2. Both the voltage and the current are the same all the way round
3. The voltage across each branch is the same as the battery voltage and the currents through each branch add up to the battery current
4. The voltages in each branch add up to the battery voltage, while the current is the same as the battery current
Which one of these do electrons carry from the battery around the circuit?
1. Voltage
2. Current
3. Resistance
4. Energy
The resistance in a wire increases when:
1. a bigger current flows.
2. it gets hotter
3. a bigger voltage is applied.
4. it is made thicker
Which one of these quantities does NOT determine the resistance of a wire?
1. Its length
2. It thickness
3. the voltage applied across its ends
4. The material it's made from
Ohm's Law states:
The current through a conductor is directly proportional to the potential difference, provided the ______ remains the same.

Which word goes in the space?
1. Temperature
2. Air pressure.
3. Humidity
4. Concentration
The equation for Ohms law is:
1. I = VR
2. I = V/R
3. I = R/V
4. I = V - R
When you investigate the way the resistance of a wire varies with length, which factor is the independent variable?
1. The voltage
2. The current
3. The length
4. The resistance
When you plot the voltage current graph of a filament lamp, the graph is:
1. a straight line, because the resistance remains the same as the filament gets hot
2. a straight line, because the resistance of the filament increases as it gets hot.
3. a curve, because the resistance of the filament decreases as it gets hot.
4. a curve, because the resistance increases as the filament gets hot
Which one of these statements is correct for a semi-conductor diode?
1. Its voltage-current graph is a straight line.
2. It conducts at a voltage greater than +0.6 volts, and less than -0.6 V
3. It conducts at a voltage of -0.6 and allows current to flow from negative to positive.
4. It conducts at a voltage of +0.6 V, and allows current to flow from positive to negative.
Which one of these statements is NOT correct about a light dependent resistor (LDR)?
1. Its resistance increases as it gets dark.
2. Its resistance falls as it gets light
3. It generates electricity when exposed to light
4. The material inside is cadmium sulphide, which releases electrons when exposed to light.
In a circuit consisting of three resistors wired in series, the values are 2 ohms, 4 ohms, and 6 ohms. The three are connected to a battery of voltage 8.0 V. Which one is the correct total resistance and the correct current?
1. Resistance = 12 ohms and current = 0.67 amps
2. Resistance = 12 ohms and current = 0.75 amps
3. Resistance = 10 ohms and current = 0.80 amps
4. Resistance = 10 ohms and current = 0.67 amps
Which one of these is correct about the mains voltage and frequency in Europe?
1. 230 V DC
2. 110 V at 60 Hz
3. 110 V at 50 Hz
4. 230 V at 50 Hz
Which one of these is the correct colour code for a three-pin plug?
1. Live - blue
  Neutral - brown
  Earth - yellow/green
2. Live - brown
  Neutral - blue
  Earth - yellow/green
3. Live - yellow/green
  Neutral - brown
  Earth - blue
4. Live - yellow/green
  Neutral - blue
  Earth - brown
Which one of these instruments would you use to display an AC waveform?
1. An ammeter
2. A voltmeter
3. A cathode ray oscilloscope (CRO)
4. An ohm-meter
The voltage of a mains source was measured with a voltmeter, giving a reading of 244 volts.
Which one statement is correct?
1. This is the peak voltage.
2. This is the rms voltage and the peak voltage is 344 V
3. This is the rms voltage and peak voltage is 173 V
4. This is the DC voltage.
A 1.5 kW appliance is connected to the 230 V mains. What is the best fuse to use?
1. 1 A
2. 5 A
3. 10 A
4. 13 A
Charge is measured in:
1. coulombs
2. amps
3. joules
4. ohms
Carbon 12 has an atomic number of 6 and a mass number of 12. This means that:
1. it has 6 protons, 12 neutrons, and 12 electrons
2. it has 12 protons, 6 neutrons, and 12 electrons.
3. it has 6 protons and 12 electrons
4. it has 6 protons, 6 neutrons, and 6 electrons.
Which one of these statements is true of background radiation?
1. It is only gamma rays.
2. The radiation comes from rocks, soil, etc.
3. It increases in hot weather.
4. The particles themselves are highly radioactive
Which one of these statements is true of an alpha particle?
1. It is a helium atom.
2. It is highly radioactive
3. It is a radioactive electron
4. It is a helium nucleus.
A source emits alpha, beta, and gamma radiation. The beam is passed between two plates, between which there is a potential difference of 15 000 volts.
What happens?
1. The alpha and beta are both attracted to the positive plate, and the gamma rays are not deflected.
2. The beta particles are deflected towards the negative plate, the alpha particles towards the positive plate, while gamma rays are not deflected.
3. The beta particles are deflected towards the positive plate, the alpha particles towards the negative plate, while gamma rays are not deflected.
4. The beta particles are deflected towards the positive plate, the alpha particles towards the negative plate, while gamma rays are deflected towards either plate.
A source emits alpha, beta, and gamma radiation. The beam is passed between the poles of a powerful magnet
What happens?
1. The beta particles are deflected towards the north pole, the alpha particles towards the south pole, while gamma rays are not deflected.
2. The beta particles are deflected in a circular anticlockwise path, the alpha particles a circular clockwise path, while gamma rays are not deflected.
3. The alpha and beta particles are both deflected in a circular clockwise path while gamma rays are not deflected.
4. All three are deflected in a circular clockwise path.
What instrument is used to measure accurately the count from a radioactive source?
1. A voltmeter
2. A thermometer
3. A Geiger-Mueller tube
4. A light dependent resistor
A very weak radioactive source has a low count rate. What would you see when you are measuring it with a radiation monitor?
1. No count at all.
2. A very steady but low count rate.
3. A count rate that regularly changes from very high to very low.
4. An entirely random variation
Which one of these is the correct statement about Radon?
1. It is radioactive gas, belonging to the same group as argon and neon. It is chemically very unreactive.
2. It is a radioactive metal, belonging to the same group as sodium. It is very reactive.
3. It reacts readily with other elements, and its radioactivity increases greatly during the chemical reactions.
4. When it's radioactive, its density is much less than that of air. When it stops being radioactive, it sinks to the bottom of its container.
Most background radiation comes from
1. nuclear power stations
2. radioactive waste
3. gases in the home
4. food.
When Rutherford did his experiments, the results were that:
1. gold atoms burst when struck by alpha particles
2. there was no deflection whatever of alpha particles.
3. all the alpha particles stuck to the gold atoms
4. some alpha particles were deflected, with a very small number bouncing back in the direction they came from.
The results of his experiments led Rutherford to the conclusion that:
1. the atom was made up of positive and negative charge mixed together.
2. the atom consists of a very tiny positively charged nucleus surrounded by a cloud of electrons.
3. atoms don't break easily.
4. there were too many anomalous results for his data to be reliable.
The protons are packed with the neutrons into the very tiny space of a nucleus. Which one statement correctly explains why the nucleus does not fly apart?
1. The protons and neutrons are held together by the repulsive forces of the electrons in the shells.
2. The protons and neutrons are held together by gravity.
3. The protons and neutrons are held together by the strong nuclear force.
4. The protons and neutrons are held together by magnetism.
Einstein's equation, E = mc², tells us:
1. matter can be turned into energy and back.
2. energy and matter can be created or destroyed at will.
3. the universe is expanding.
4. how the salary and pensions of top city bankers and premiership footballers are worked out.
Fission happens when
1. a neutron shatters the nucleus of a fissile element
2. a neutron gets captured by the nucleus of a fissile element.
3. the nucleus of a fissile element decays emitting an alpha particle.
4. the atom of a fissile element reacts with a strong acid.
In April 1986 a nuclear reactor at Chernobyl exploded. This was because:
1. it had become worn out and burst.
2. a nuclear explosion had taken place, destroying everything in a 30 km radius.
3. a chemical explosion took place, blowing the lid off the reactor, and throwing the contents in the air.
4. terrorists had dropped a bomb from a stolen Red Army helicopter.
Which one of these is NOT an advantage of nuclear power?
1. There are no greenhouse gases emitted from power stations.
2. Fossil fuels will run out.
3. It is much more reliable than renewable sources of energy.
4. Renewable energy sources have much more impact on the environment.
The process in which two small nuclei stick together is called:
1. fison
2. fission
3. fussion
4. fusion
What conditions are needed for fusion to happen?
1. In an oven at Gas Mark 4 (150 degrees Celsius).
2. In a strong acid in the presence of a catalyst.
3. At 15 million Kelvin.
4. At pressures that ensure that hydrogen is a metal.
Which one of these has made it impossible for nuclear fusion reactors to be commercially viable?
1. The hydrogen has to be very hot, in the form of a plasma.
2. The plasma has to be held in place by a strong magnetic field
3. The risk of a fusion explosion that would fry anything within 20 km.
4. Far more electricity has to be put to make the machine work, than has been got out.
When fusion happens, a positron is emitted. What is a positron?
1. A very small proton.
2. A positively charged electron
3. A very high speed negatively charged electron.
4. A tiny particle of light.
Deuterium and a proton make a new nucleus, helium-3. What does this nucleus consist of?
1. two protons and one neutron
2. one proton and two neutrons.
3. one positron and two neutrons.
4. three protons.