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In the circuit shown, the switch is open and capacitor uncharged. When the switch is closed the voltage across the capac

In the circuit shown, the switch is open and capacitor uncharged. When the switch is closed the voltage across the capacitor. 9V. S. R. remains at 0V gradually rises from 0 to 9V immediately drops from 9V to 0V gradually drops from 9V to 0V remains at 9V. C.

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In the circuit shown, the switch is open and capacitor uncharged. When the switch is closed the voltage across the capac

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  1. In the circuit shown, the switch is open and capacitor uncharged.When the switch is closed the voltage across the capacitor 9V S R • remains at 0V • gradually rises from 0 to 9V • immediately drops from 9V to 0V • gradually drops from 9V to 0V • remains at 9V C

  2. Identify the circuit symbol shown • AND gate • OR gate • NOT gate • diode • LED

  3. Which of the following electronic devices contains a counter circuit? • Automatic parking light • Digital stopwatch • Electronic thermometer • Intercom • Radio receiver

  4. A baby alarm needs an output device that transforms electrical energy into sound energy.Which of the following is suitable? • Electric Motor • LED • Loudspeaker • Relay • Solenoid

  5. Which of the following devices contains a counter circuit? • Amplifier • Intercom • Burglar alarm • Computer • Radio receiver

  6. The purpose of the amplifier in a personal stereo is to • convert an analogue signal to a digital signal • transform an electrical signal to a sound signal • transform a sound signal to an electrical signal • increase the frequency of an electrical signal • increase the amplitude of an electrical signal

  7. Which of the following is an output device? • LDR • LED • Microphone • Solar cell • Thermistor

  8. A telephone answering machine contains a loudspeaker, which is used in playing back any message received. The main energy transfer in the loudspeaker is • electrical to sound • sound to electrical • chemical to sound • sound to chemical • electrical to chemical

  9. Which of the following is an input device? • Relay • Buzzer • Solenoid • Loudspeaker • Microphone

  10. The symbol below is used to represent a component in an electronic circuit. What does it represent? • A NOT gate • An AND gate • A LDR • A LED • An OR gate

  11. Which of the following does not need a magnetic field to make it work? • Relay • Solenoid • Electric Motor • Electric Bell • Amplifier

  12. The following symbol is used in circuit diagrams.The symbol represents a • light emitting diode (LED) • light dependent resistor (LDR) • transistor • variable resistor • battery

  13. A…

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