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WorksheetsBasic Electronics
Total questions: 70
Worksheet time: 35mins
Current can only flow if there is a
open circuit
closed circuit
In parallel circuit, current is
equal
unequal
more powerful
less powerful
The gold color band refers to__________tolerance.
+ / - 20%
+ / - 10%
+ / - 5%
Zero
What is the purpose of a variable resistor in a circuit?
allow current flow
control current flow
to see the color
allow heat to build up
An example in which light emitting diodes are used, is
calculator
hard drive
optical drive
analog watch
Current through each resistor when they are connected in series is
different
same
can be both A and B
decreasing
What is the unit of measurement for Current?
Voltage
Ampere
Watts
Ohms
Series connected resistance of 5 Ω and 10 Ω is equal to
10 Ω
50 Ω
15 Ω
20 Ω
Two 10 Ω resistors are connected in parallel, their equivalent resistance is
5 Ω
0.2 Ω
15 Ω
20 Ω
Graphite is a :
conductor
insulator
semiconductor
none of these
wood is a _____?
Conductor
insulator
Doping is a process of :
purifying semiconductor material
increasing impurity percentage
removal of foreign atoms
increasing the bias potential
Which of the following doesn’t have forbidden energy gap between valence band and conductor band ?
conductor
insulator
semiconductor
The battery connections required to forward bias a pn junction are ……..
+ve terminal to p and -ve terminal to n
-ve terminal to p and +ve terminal to n
-ve terminal to p and -ve terminal to n
none of the above
The barrier voltage at a pn junction for Silicon is about ……..
3.5 V
3 V
zero
0.7 V
A reverse biased pn junction has ……..
very narrow depletion layer
No current
very low resistance
large current flow
PN - junction acts as a ……..
controlled switch
bidirectional switch
unidirectional switch
none of the above
A semiconductor in its purest form is called.......
Extrinsic semiconductor
Superconductor
Intrinsic semiconductor
Nucleus is made of
Electrons and protons
Photons and neutrons
Photons
Photons and electrons
For a silicon P-N junction, the barrier potential is about
0.7 V
0.8 V
0.9 V
1.0 V
For a germanium P-N junction, the barrier potential is nearly.......
0.15 V
0.3 V
0.45 V
0.6 V
A zener diode is invariably used with
Reverse bias
Forward bias
Zero bias
Any of the above
In series, if one bulb goes out, others will
stay on
also turn off
blow up
heat up
A zener diode has ………..
one pn junction
two pn junctions
three pn junctions
none of the above
A zener diode is used as …………….
an amplifier
a voltage regulator
a rectifier
a multivibrator
A PN junction
Has low resistance in forward as well as reverse directions
Has high resistance in forward as well as reverse directions
Conducts in forward direction only
Conducts in reverse direction only
The forward voltage drop across a silicon diode is about…….
2.5 V
3 V
10 V
0.7 V
A reverse biased diode will act as an open switch.
TRUE
FALSE
A reverse-biased PN junctions has
A net electron current
A net hole current
A very narrow depletion layer
Almost zero current
The positive lead of a diode is the cathode.
TRUE
FALSE
With a 12 V supply, a silicon diode, and a 370-ohm resistor in series, what voltage will be dropped across the diode?
0.3 V
0.7 V
0.9 V
1.4 V
A diode can be tested with an ohmmeter.
TRUE
FALSE
The depletion layer of a PN junction diode has
Only free mobile holes
Only free mobile electrons
Both free mobile holes as well as electrons
Neither free mobile electrons nor holes
When PN junction is in forward bias, by increasing the battery voltage
Circuit resistance increases
Current through P-N junction increases
Current through P-N junction decreases
None of the above happens
When a PN junction is reverse-biased
Holes and electrons tend to concentrate towards the junction
Holes and electrons tend to move away from the junction.
What are the basic components of an electric circuit?
Energy source
Connecting wires
Switch
All of the above
Is Iron a Conductor or Insulator?
Conductor
Insulator
Which is NOT an insulator.
Wool
Plastic
Copper
Glass
Is Wood a conductor or Insulator?
Conductor
Insulator
What is the difference between a conductor and an insulator?
An insulator allows electricity to flow through it easily and a conductor does not
A conductor allows electricity to flow through it easily and an insulator does not.
A conductor will not allows electricity to flow through it easily and an insulator does not.
A conductor is magnetic and an insulator is not
water is a______?
Conductor
insulator
A material in which electrons are not able to move easily
Insulator
Resistance
Conductor
Silver is a _____?
Insulator
conductor
A material in which electrons are able to move easily
Insulator
Resistance
Conductor
A jacket is a good example of an . . .
Insulator
Investigator
Conductor
Interrogator
Which one is an insulator?
Silver
Copper
Iron Rod
plastic
Gold is an example of ________.
a conductor
an insulator
Cotton is an example of _____.
a conductor
an insulator
A great conductor of energy is:
Wood
Plastic
Metal
Cloth
When all parts of the circuit are connected it is a ______ circuit.
Open
Closed
Diode
allows current to flow in one direction
allows current to flow in two directions
is a resistor
Identify the Circuit as
Parallel circuit
Combined circuit
Series circuit
Breadboard
Identify the Circuit as
Parallel circuit
Combined circuit
Series circuit
Breadboard
Identify the Symbol
Breadboard
LED
Series circuit
Diode
Identify the Circuit as
Parallel circuit
Combined circuit
Series circuit
Workbench
Identify the Symbol
Breadboard
LED
Series circuit
Diode
Identify the Symbol
Breadboard
LED
Zener Diode
Diode
Identify the Condition of the Circuit as
Parallel circuit
Forward Biasing
Reverse Biasing
Workbench
Identify the Condition of the Circuit as
Parallel circuit
Forward Biasing
Reverse Biasing
Workbench
Which picture (left or right) shows the correct way the battery wires should be attached?
Left
Right
They are both wrong
They are both correct
Which leg of the LED is the positive side?
The longer one
The shorter one
There is no positive side
They are both positive, I'm positive of it.
What is the name of this item in the picture?
Resistor
Jumper wires
Battery Leads
Alligator Clips
what links the yellow holes together?
connected metal clips
nothing connects them
plastic
none of these
If, in your circuit on breadboard, Your LED won't light up when you connect the power source, what should you look for to solve this problem?
check your battery power and connection and make sure you have the battery hooked up correctly
make sure all your connections are in the same row, or connect to other rows correctly
both of theses answers should be checked.
A material's opposition to the flow of electric current is called
Electricity
Resistance
Ground
Capacitor
Identify the Circuit as
Parallel circuit
Combined circuit
Series circuit
nothing connects them
A resistor's first three colour bands are brown, black, and red. What is its value?
10 ohms
10 Kohms
200 ohms
1000 ohms
Which digit does the color yellow denote on a resistor color band?
3
2
4
7
Which of these colors is NOT used in the resistor value color code?
white
black
violet
pink
What is the unit of measurement for resistance?
Voltage
Ampere
Watts
Ohms
