ANSWERS AND MARK SCHEMES. (a) A base 1 B collector 1 C emitter 1. (b) = 2.82 ma 1. (c) Zero or very low current 1
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1 QUESTIONSHEET 1 (a) A base 1 B collector 1 C emitter 1 (b) = 2.82 ma 1 (c) Zero or very low current 1 QUESTIONSHEET 2 (a) TOTAL / 6 Thermistor in place 1 Thermistor symbol correct 1 Fixed resistor in place 1 (b) Fixed resistor replaced 1 by variable resistor 1
2 QUESTIONSHEET 3 (a) One mark for each (b) (i) One mark per line A on/off B safety screen Drill on/off on on on on off off off on off off off off A B C (ii) AND gate 1 QUESTIONSHEET 4 (a) (b) A B Output TOTAL / 9 1 4
3 QUESTIONSHEET 5 (a) (i) One 1 (ii) Input Output (iii) Inverts/reverses the input 1 (b) (i) NOT and AND 1 (ii) Correct symbols 1 NOT gate follows 1 AND gate 1 QUESTIONSHEET 6 TOTAL / 8 (a) One mark for each point: Taking some of the output 1 and feeding it back 1 to the input 1 (b) Line drawn from output to input 1 (c) One mark for each point: System can check how effective it is 1 and change its operation if necessary 1 This makes it more accurate/sentitive 1
4 QUESTIONSHEET 7 (a) Bell stops ringing 1 (b) (i) Wire connected between bell and relay 1 (ii) A switch 1 in series with bell 1 (c) It is stable in two states/ there are two states which the circuit will stay 1 It stays in one state unless reset 1 QUESTIONSHEET 8 TOTAL / 6 (a) Any Two From seat belt connected engine not running no-one sitting in passenger seat 2 (b) Input A Input B P (A and B) Q (Not B) alarm (one mark for each correctly completed column) QUESTIONSHEET 9 5 (a) (i) Nothing/Zero 1 (ii) The diode only lets current flow 1 in one direction 1 (b) Only current in positive (or negative) direction flows 1 Half of sine wave cut out 1 Current only flows for half the time/ cycle 1 I t 1
5 QUESTIONSHEET 10 (a) Input voltage / V divided up 1 by ratio of size of resistors 1 (b) (i) Variable resistor/ R 2 1 (ii) Collector current high/ current now flows through collector 1 (iii) Lamp comes on 1 QUESTIONSHEET 11 (a) One mark for each point: Resistance goes up 1 Voltage across transistor increases 1 Transistor switches on 1 Lamp comes on 1 (b) Thermistor 1 QUESTIONSHEET 12 (a) LDR 1 Pressure 1 (b) NOT 1 AND 1 (c) light sensor pressure sensor porch light Light sensors connected to NOT gate 1 Pressure sensor forms one input to AND gate 1 Output from NOT gate forms second input 1 Output from AND gate connected to porch light 1 TOTAL / 8
6 QUESTIONSHEET 13 (a) TIMER PROCESSOR BOILER (b) (i) System cannot monitor the water temperature 1 The central heating system could get hotter indefinitely/ the home would overheat 1 (ii) Boiler temperature sensor loop 1 Feedback loop 1 Line drawn from boiler temperature sensor to the processor 1 QUESTIONSHEET 14 TIMER PROCESSOR BOILER BOILER TEMPERATURE SENSOR 2 (a) Thermistor 1 Switch for alarm 1 (b) AND 1 (c) Buzzer/ bell/ LED/ lamp 1 (d) Replace alarm 1 By relay switch 1 Connect to heater 1
7 QUESTIONSHEET 15 (a) (i) falls/gets lower 1 (ii) increases/gets higher 1 (iii) replace lamp with buzzer/bell 1 ensure room light plays on LDR 1 (b) (i) change sensitivity/adjust required light level for operation 1 (ii) light on LDR falls/gets less 1 resistance increases to exceed that of R 2 1 current flows though lamp 1 QUESTIONSHEET 16 TOTAL / 8 (a) (i) circuit with two switches 1 in series 1 (ii) two inputs 1 passing through AND gate to machine 1 (iii) electronic components less likely to fail 1 lower current used 1 (b) thermistor 1 LDR 1 Buzzer or bell 1 QUESTIONSHEET 17 (a) INPUT PROCESSOR OUTPUT TOTAL / 9 3 (b) (i) Any one of: mircophone, pressure switch, thermistor, light dependent resistor 1 (ii) Any one of: loudspeaker, bell, buzzer, light emitting diode, lamp, motor 1
8 QUESTIONSHEET 18 Name Symbol What is the output? LED Light Loudspeaker Motor QUESTIONSHEET 19 Sound Movement 4 TOTAL / 4 (a) Light-emitting diode 1 (b) lower current used 1 less likely to fail 1 do not get hot 1 (c) (i) 7 1 (ii) 4 6 M (iii) 8 shows when all LEDs are lit 1 rapid change makes all appear to be lit 1 2 TOTAL / 9
9 QUESTIONSHEET 20 (a) (i) light comes on/lamp lights 1 (ii) light/lamp goes out 1 (b) (i) use normally closed switch on door/door jam 1 magnet on door jam/door 1 when door opens switch closes and operates alarm 1 (ii) normally open switch on body/door 1 magnet on door/body 1 when door opens switch opens and turns off power 1 TOTAL / 8
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