1. Which of the signals below is a digital signal? 1. 2. 3. 4. 5. 40

2. The box below contains components used in electronics The box contains: Capacitor, thermistor, loudspeaker, relay, potential divider, LED, solar cell 1.2 input devices and 5 output devices 2.3 input devices and 4 output devices 3.4 input devices and 3 output devices 4.5 input devices and 2 output devices 5.6 input devices and 1 output devices 40

3. Which of the symbols below is the correct symbol for LDR 1. 2. 3. 4. 5. 40

4. A resistor is usually placed in series with a LED to 40 1.Increase the current flowing in the LED 2.Give the current an alternative path 3.Reduce the voltage flowing through the LED 4.Increase the brightness of the LED 5.Reduce the current flowing through the LED

5. Which of the components below would be a suitable input device for a public address system at sports day 1.Relay 2.Buzzer 3.Solenoid 4.Loudspeaker 5.Microphone 40

6. This is the symbol for which electronic component? 40 1.A NOT gate 2.An AND gate 3.An OR gate 4.A light dependent resistor 5.A light emitting diode

7. In the circuit when the switch is closed the reading on the voltmeter rises slowly to 6v. Which of the following components could X be? X V 1.Capacitor 2.Resistor 3.Bulb 4.Diode 5.LED 40

8. When this circuit is switched on the bulb lights dimly and the LED is bright. What would happen if the battery connections were reversed? 1.The bulb goes out 2.The LED burns out 3.the bulb becomes a little duller 4.the bulb becomes a little brighter 5.The bulb and the LED go out 40

9. Which single digit number on a seven segment display uses the most segments 1.Three 2.Four 3.Five 4.Eight 5.Nine 40

10. A solar cell changes 1.Light energy to heat energy 2.Light energy to electrical energy 3.Light energy to chemical energy 4.Heat energy to electrical energy 5.Heat energy to light energy 40

11. A Thermistor has a resistance of 1000Ω at 300 o C and 2000Ω at 100 0 C. It is connected to a 3V supply. What could be the current in the circuit at 200 0 C? 1.0.5mA 2.1.0mA 3.1.5mA 4.2.0mA 5.3.0mA 40

12. In this circuit V 1 reads 2v and V 2 reads 7v. If the light level was increased, what could be the new readings on V 1 and V 2? V1V1 V2V2 1.1v and 8v 2.2v and 5v 3.2v and 8v 4.4v and 5v 5.5v and 4v 40

13. When 11 binary is multiplied by 11 binary the answer in binary is 1.100 2.101 3.121 4.1000 5.1001 40

14. Which of the symbols below is the symbol for a two input OR gate 1. 2. 3. 4. 5.

15. X Y The circuit above was designed to switch a LED on when 1.Switch X is on and switch Y is not on 2.Switch X is not on and switch Y is on 3.Switch X is on or switch Y is on 4.Switch X is not on or switch Y is not on 5.Switch X is not on and switch Y is not on 40

16. This circuit is designed to: 1.Produce a voltage gain 2.Produce a power gain 3.Produce clock pulses 4.Produce a switched circuit 5.Produce a high voltage 40

17. An amplifier has a voltage gain of 5. If the input voltage is 12mv and the input current is 2mA, the output voltage of the amplifier is 40 1.10mv 2.17mv 3.24mv 4.60mv 5.120mv

18. Which of the following appliances does not have an amplifier? 1.Hairdryer 2.CD player 3.Television 4.Telephone 5.Satellite receiver 40

19. What is the least number of switches that must be closed to light the LED 1. 2. 3. 4. 5. 40

20. A voltage from a signal generator is fed into an oscilloscope and the pattern to the right is obtained.If voltage is now fed into an amplifier with a gain of 2, what would the pattern look like ? 1. 2. 3. 4. 40

21. A voltage signal from a signal generator is fed into an oscilloscope.The trace is shown below. 40 1.Enter answer text...