10 minutes maximum! Can you do it in 5?

Q1-3. Can you identify these components?

1.

2.

3.

4. A component that emits light and only lets current pass through one way is called

  • A. an L.D.R.
  • B. an L.E.D.
  • C. a diode
  • D. a thermistor
5. Which component has a voltage(V) ~ current (I) graph like this? V~I graph for a component
  • A. a resistor
  • B. a diode
  • C. a bulb (filament lamp)
  • D. an L.D.R.
6. Which component has a voltage(V) ~ current (I) graph like this?
  • A. a resistor
  • B. a diode
  • C. a bulb (filament lamp)
  • D. an L.D.R.

7. Two components are frequently used as sensors for heat and light . They are.....

For Sensing Heat For Sensing Light
A
 LDR LED
B
 Thermistor LED
C
 LDR Thermistor
D
 Thermistor LDR

8. A variable resistor is used to vary the brightness of a bulb. Which circuit correctly shows the right components and the right circuit layout?

 

9. When a current flows through any resistor, some of the electrical energy is transfered to ..

  • A. heat energy.
  • B. chemical energy.
  • C. friction.
  • D. static electricity.
10. This circuit has a 'light sensor' component and a bulb.

On a sunny day ...

  • A. the bulb gets dimmer as the light sensor resistance increases.
  • B. the bulb gets dimmer as the light sensor resistance decreases.
  • C. the bulb gets brighter as the light sensor resistance increases.
  • D. the bulb gets brighter as the light sensor resistance decreases.