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- 1. Multiple Choice
In which circuit does the bulb light up?
- 2. Multiple Choice
What are the names of the terminals X, Y and Z?
X = Base, Y = Collector, Z = Emitter
X = Emitter, Y = Base, Z = Collector
X = Collector, Y = Base, Z = Emitter
X = Collector, Y = Emitter, Z = Base
- 3. Multiple Choice
Diagram shows an automatic switch circuit to light up a bulb during the day time. What changes should be done to light up the bulb at night?
Interchange R1 and R3
Reverse the terminal of the battery
Replace the npn transistor with a pnp transistor
Interchange R1 and the LDR
- 4. Multiple Choice
Diagram shows a light controlled switch. The alarm will be activated when
the surrounding is dark
the surrounding is bright
the temperature of the surrounding is high
the temperature of the surrounding is low
- 5. Multiple Choice
The street lights use electronic control system that switches the lights on when the surrounding is dark. What is the input sensor of the control system?
A thermistor
A light emitting diode
A microphone
A light dependent resistor
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