Chapter 5 Practice Paper: Electrical Systems — question paper

Section A: Multiple-choice questions[10 marks]

Answer all questions. For each question, write the letter (A, B, C or D) of the correct answer in the brackets provided.

1. 1

   On a circuit diagram, the symbol that is placed in the path of the current to measure it is

   1. Aan ammeter.
   2. Ba voltmeter.
   3. Ca variable resistor.
   4. Da fuse drawn as a voltmeter.
   ( )
2. 2

   A voltmeter is connected

   1. Ain place of the cell.
   2. Bas the only gap in an open switch.
   3. Cacross a component.
   4. Dso that it measures resistance in kilograms.
   ( )
3. 3

   The quantity measured in ohms is

   1. Acurrent.
   2. Bresistance.
   3. Cpower.
   4. Dpotential difference.
   ( )
4. 4

   A fuse makes a circuit safer because it

   1. Aincreases the current.
   2. Bstores the charge as drinking water.
   3. Cmeasures mass.
   4. Dmelts and leaves a gap if the current is too large.
   ( )
5. 5

   A doorbell and a porch lamp share a single loop from one cell. The doorbell is removed and leaves a gap. The porch lamp

   1. Agoes out.
   2. Bbecomes brighter and stays on.
   3. Cturns into a parallel path by itself.
   4. Dmeasures the voltage.
   ( )
6. 6

   A string of fairy lights stays lit when one bulb is taken out. The bulbs are wired so that

   1. Aone gap puts every bulb out.
   2. Bcurrent is measured in watts.
   3. Ceach bulb has its own path, so the others stay lit.
   4. Dno complete circuit is needed.
   ( )
7. 7

   A cable with the plastic coat cut away, so bare metal shows, is dangerous because

   1. Athe metal has no resistance at all.
   2. Bthe lamp will become a cell.
   3. Cthe current cannot leave the wire.
   4. Dthe current can leave the wire and give a shock.
   ( )
8. 8

   The rate at which an appliance transfers energy is measured in

   1. Aohms.
   2. Bwatts.
   3. Camperes.
   4. Dvolts.
   ( )
9. 9

   A kettle element becoming hot shows

   1. Athe heating effect of a current.
   2. Bthat the circuit is open.
   3. Cthe unit of resistance.
   4. Da food chain.
   ( )
10. 10

    A rectangle with an arrow across it is the symbol for

    1. Aan ammeter.
    2. Ba cell.
    3. Ca variable resistor.
    4. Da lamp.
    ( )

Section B: Structured questions[20 marks]

Answer all questions in the spaces provided. Show your working for calculations.

1. 1

   A circuit diagram shows a cell, a closed switch, a lamp and an ammeter, all in one loop. A voltmeter is drawn across the lamp. A rectangle is then added in the loop.

   1. (a)

      State what the ammeter measures, and the unit.

      [2]
   2. (b)

      State what the voltmeter measures.

      [1]
   3. (c)

      Name the component shown by the rectangle, and the quantity it provides.

      [2]
2. 2

   A bicycle has a front lamp and a rear lamp joined to one cell.

   1. (a)

      Both lamps share a single path. The front filament snaps, opening that path. Explain the effect on the rear lamp.

      [2]
   2. (b)

      The lamps are then given separate paths back to the cell. The front lamp is removed. Explain what happens to the rear lamp.

      [2]
   3. (c)

      State why the ceiling lamps in a classroom are given separate paths rather than one shared loop.

      [1]
3. 3

   A student finds a blown fuse and a damaged extension lead.

   1. (a)

      Explain why replacing the fuse with a thick piece of wire is unsafe.

      [2]
   2. (b)

      State why wet hands near a socket are dangerous.

      [1]
   3. (c)

      A kettle and a heater are both plugged into one adaptor on the damaged lead. Explain why that adaptor can start a fire.

      [2]
4. 4

   Appliances transfer energy at different rates.

   1. (a)

      Name the unit in which power is measured.

      [1]
   2. (b)

      An 800 W toaster and a 15 W night-light are both switched on for ten minutes. State which transfers more energy, and why.

      [2]
   3. (c)

      State one change in a kitchen that would cut the electrical energy used in a week.

      [1]
   4. (d)

      State one example of the chemical effect of a current.

      [1]