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WorksheetsC5 Electronics
Total questions: 25
Worksheet time: 13mins
Which component is used to detect a change in temperature?
Thermistor
LDR
Transistor
Switch
In which circuit does the bulb light up?
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
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
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
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?
Thermistor
Light emitting diode
Microphone
Light dependent resistor
Diagram shows a transistor circuit with a thermistor and a light bulb.
What happens to the resistance of the thermistor and the light bulb when the temperature of the surrounding is at room temperature?
Resistance of thermistor low and does not lights up
Resistance of thermistor high and lights up
Resistance of thermistor low and lights up
Resistance of thermistor high and does not lights up
Diagram shows an automatic circuit using transistor. The resistance of thermistor decrease as the surrounding temperature rises. The bell will ring when the potential difference across the resistor R is 4V. What is resistance of the thermistor?
4 kΩ
5 kΩ
10 kΩ
16 kΩ
One function of the transistor is to____________?
rectify
amplify
limit
control
In which circuit does the bulb light up?
A light-dependent resistor (LDR) is a resistor which is sensitive to light. The resistance of the LDR is low when surrounding is bright and high in the dark. Which circuit will light up the bulb at night?
A
B
C
D
Diagram shows a n-p-n transistor connected to a direct current supply. Which of the following is correct?
IE > IC > IB
IE > IB > IC
IC > IE > IB
IC > IB > IE
Diagram shows the value of the current flowing through a transistor. What is the value of base current?
0.01mA
0.02 mA
0.03 mA
0.04 mA
Diagram shows a transistor circuit used to operate a 240V air conditioner. Which condition turns on the air conditioner?
Thermistor's temperature: Low
Base Voltage: Low
Thermistor's temperature: Low
Base Voltage: High
Thermistor's temperature: High
Base Voltage: High
Thermistor's temperature: High
Base Voltage: Low
Diagram shows the electric circuit which switches on the bulb automatically during the day. The circuit needs to be modified so that it will function as a fire alarm. Which of the following are the symbols for the components which need to be connected at P and Q?
A
B
C
D
Diagram hows four diodes which are connected to form a rectifier.
Which wave pattern is produced on the C.R.O. screen on the diagram?
which statement is correct? (the dark circles represent the electrons)
p-type of the diode is connected to the negative terminal.
Electron moves across the p-n junction, makes the diode forward biased
current will not flow in the circuit
reverse biased circuit
Which of the following circuits will produce a full wave rectification?
Diagram shows a circuit with a bulb that does not light up. Which of the following actions will make the bulb light up?
Connecting a fuse to the circuit
Reversing the battery connection
Changing the power supply to a 3V battery
Reversing the bulb connection
Which of the following circuits will light up the bulb?
A
B
C
D
Diagram shows five identical bulbs P, Q, R, S and T in a circuit. Which bulbs light up continuously when the switch is on?
P, Q and T
Q and S
R and S
P and R
Which of the following circuits shows the forward-biased arrangement of a diode?
A
B
C
D
Diagram shows a circuit connected to the cathode ray oscilloscope (CRO).
Which of the following traces displayed on the CRO is correct when diode P is reversed?
Which particle is cathode ray?
Electron beam
Gamma ray
Neutron
Alpha particles
Diagram shows a vacuum tube used to investigate a thermionic emission. What is the function of cathode?
to produce the electron when it is heated by a filament
to accelerate the electron at a high speed
to control the intensity of electron beam
to deflect the electron beam vertically
