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Which of the signals below is a digital signal? 1. 20%2. 20%3. 20%4. 20%5. 20% 40 The box below contains components used in electronics Capacitor, thermistor, loudspeaker, relay , potential divider, LED, solar cell The box contains: 20%1. 20%2. 20%3. 20%4. 20%5. 2 input devices and 5 output devices 3 input devices and 4 output devices 4 input devices and 3 output devices 5 input devices and 2 output devices 6 input devices and 1 output devices 40 Which of the symbols below is the correct symbol for LDR 1. 20%2. 20%3. 20%4. 20%5. 20% 40 A resistor is usually placed in series with a LED to 20%1. 20%2. 20%3. 20%4. 20%5. Increase the current flowing in the LED Give the current an alternative path Reduce the voltage flowing through the LED Increase the brightness of the LED Reduce the current flowing through the LED 40 Which of the components below would be a suitable input device for a public address system at sports day 20%1. 20%2. 20%3. 20%4. 20%5. Relay Buzzer Solenoid Loudspeaker Microphone 40 This is the symbol for which electronic component? 20%1. 20%2. 20%3. 20%4. 20%5. A NOT gate An AND gate An OR gate A light dependent resistor A light emitting diode 40 In the circuit when the switch is closed the reading on the voltmeter rises slowly to 6v. X Which of the following V components could X be? 20%1. 20%2. 20%3. 20%4. 20%5. Capacitor Resistor Bulb Diode LED 40 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. 20% 2. 20% 20% 3. 20% 4. 20% 5. The bulb goes out The LED burns out the bulb becomes a little duller the bulb becomes a little brighter The bulb and the LED go out 40 Which single digit number on a seven segment display uses the most segments 20%1. 20%2. 20%3. 20%4. 20%5. Three Four Five Eight Nine 40 A solar cell changes 20%1. 20%2. 20%3. 20%4. 20%5. Light energy to heat energy Light energy to electrical energy Light energy to chemical energy Heat energy to electrical energy Heat energy to light energy 40 A Thermistor has a resistance of 1000Ω at 300oC and 2000Ω at 1000C. It is connected to a 3V supply. What could be the current in the circuit at 2000C? 20%1. 20%2. 20%3. 20%4. 20%5. 0.5mA 1.0mA 1.5mA 2.0mA 3.0mA 40 In this circuit V1 reads 2v and V2 reads 7v. If the light level was increased, what could be the new readings on V1 and V2? 20%1. 20%2. 20%3. 20%4. 20%5. V2 V1 1v and 8v 2v and 5v 2v and 8v 4v and 5v 5v and 4v 40 When 11binary is multiplied by 11binary the answer in binary is 20%1. 20%2. 20%3. 20%4. 20%5. 100 101 121 1000 1001 40 Which of the symbols below is the symbol for a two input OR gate 20%1. 20%2. 20%3. 20%4. 20%5. X Y The circuit above was designed to switch a LED on when 20%1. 20%2. 20%3. 20%4. 20%5. Switch X is on and switch Y is not on Switch X is not on and switch Y is on Switch X is on or switch Y is on Switch X is not on or switch Y is not on Switch X is not on and switch Y is not on 40 This circuit is designed to: 20%1. 20%2. 20%3. 20%4. 20%5. Produce a voltage gain Produce a power gain Produce clock pulses Produce a switched circuit Produce a high voltage 40 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 20%1. 20%2. 20%3. 20%4. 20%5. 10mv 17mv 24mv 60mv 120mv 40 Which of the following appliances does not have an amplifier? 20%1. 20%2. 20%3. 20%4. 20%5. Hairdryer CD player Television Telephone Satellite receiver 40 What is the least number of switches that must be closed to light the LED 20%1. 20%2. 20%3. 20%4. 20%5. 40 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 ? 25% 25% 25% 25% 1. 2. 3. 4. 40 A voltage signal from a signal generator is fed into an oscilloscope.The trace is shown below. 100% 1. Enter answer text... 40