1) Put the following parts of any electronic system into the correct order a) input, process, output b) process, output, input c) input, output, process d) output, process, input e) process, input, output f) output, input, process 2) Which one of these oscilloscope traces shows a digital signal? a) signal A b) signal B 3) which one only has output devices a) microphone, loudspeaker b) solenoid, the LED, thermistor c) capacitor, light dependant resistor d) electric motor, LED,7 segment display 4) What is the name of this component? a) the thermistor b) the LDR c) the LED d) the transistor 5) This is a capacitor. Placing a resistor in series with it would mean it would take time to charge up. What could you do to increase the time for the capacitor to charge/discharge the most? a) put the resistor and capacitor value up b) put the resistor and capacitor values down c) put only the resistor value up d) put only the resistor value down e) put only the capacitor value down f) put only the capacitor value down 6) The binary number 10. What is it in decimal? a) 1 b) 2 c) 3 d) 10 e) 1010 f) 4 7) The decimal number 7. What one is it in binary code. a) 1010 b) 7 c) 222 d) 1111111 e) 0111 f) 1110 8) A L.E.D. always has a resistor in series with it. Why is this? a) The resistor helps the LED give out only one colour. b) The LED gets lonely c) The resistor restricts too high a voltage getting to the LED d) To get rid of excess heat e) The resistor restricts the current from being too high which would damage the LED 9) What happens to the resistance of a thermistor as its temperature goes down a) it decreases b) it stays the same c) it increases 10) What happens to the resistance of a thermistor when light levels increase? a) it decreases b) it stays the same c) it increases 11) What happens to a Light Dependant Resistor's resistance as it gets dark? a) it decrease b) it stays the same c) it increases 12) What is the name of this logic gate? a) AND b) NOT c) OR d) NOR e) NAND f) XOR 13) This gate is sometimes called the invertor. What is its other name? a) AND b) NOT c) OR d) NOR e) XOR f) NAND 14) What is the only possible inputs that would get the output to be a logic 0? a) input A = 0 input B=0 b) input A = 0 input B=1 c) input A = 1 input B=0 d) input A = 1 input B=1 15) Here is the npn transistor. What is the voltage needed to switch it on and between which two terminals. a) 0.7V, collector emitter b) 0.7V, base collector c) 0.7V, base emitter d) 1.2V, base emitter e) 1.2V, base collector f) 0.7V, any terminals 16) VOLTAGE gain, in what units do we use to measure this? a) volts b) amps c) coulombs d) newtons e) ohms f) there is no units 17) Amplifiers affect the frequency of a analogue wave. a) True b) False 18) Power is a measure of the joules of energy that is converted every second. So power can be measured in the units J/s and what other unit, named after a famous Greenock Engineer who perfected the steam engine? a) joule b) watt c) ohm d) ampere e) newton f) there is no unit 19) You want to make a system that switches on when it gets cold and turns on a heater in a house (a simple thermostat). What input device would you use? a) thermocouple b) LDR c) LED d) thermistor e) themometer f) LCD 20) Below is the clock pulse generator. It has a frequency of 10Hz. The capacitor is replaced with a capacitor of a higher value. What will happen to the frequency? Why? a) It will break the LED b) It will have no effect c) The frequency will go up d) The frequency will go down
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Electronics SG
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