WorksheetsÔN TIẾNG ANH
Total questions: 100
Worksheet time: 3hrs 20mins
What is the most common material used for insulating tape?
Paper
Vinyl
Wood
Copper
Needle-nose pliers are used to _____.
drill holes
twist screws
bend and snip wires
polish surfaces
Which tool is used for removing the insulation from wires?
Scissors
Screwdriver
Wire stripper
Cable shears
What is another name for needle-nose pliers?
Wire pliers
Flat pliers
Long-nose pliers
Hook pliers
Which screwdriver is used with screws that have a cross-shaped slot?
Flathead
Slot screwdriver
Allen key
Phillips screwdriver
Cable shears are ideal for cutting _____.
plastic sheets
copper and aluminum cables
screws
ceramic tiles
Which of the following is not included in an Electrician Drill Bit Kit?
Hole saw bits
Spade bits
Hammer bits
Auger bits
What does the word "it" refer to in the sentence: "Along with it, electricians need lots of drill bits"?
Electricians
Drill
Drill bits
Insulating tape
What is the function of a circuit breaker?
To produce electricity
To heat up metal
To protect the electrical circuit from excess current
To connect wires
Which tool is designed to create a clean cut without deforming the cable?
Wire stripper
Cable shears
Phillips screwdriver
Needle-nose pliers
What makes the wire stripper effective at cutting insulation without damaging the wire?
It uses electricity.
It has a curved handle.
It includes a center notch.
It is made of rubber.
Which of the following is a good conductor?
Nylon
Copper
Rubber
Porcelain
What kind of material does not easily allow the flow of electric current?
Semiconductor
Conductor
Insulator
Alloy
Which non-metal is mentioned as a good conductor?
Silicon
Plastic
Carbon
Air
What is the main property of semiconductors?
They always conduct electricity well.
They conduct only when they are frozen.
They conduct under certain conditions and insulate under others.
They never allow current to flow.
Which of the following is a liquid conductor?
Air
Salt water
Rubber
Oil
What is superconductivity?
A state where materials resist all current.
A state where resistance increases with temperature.
A state where resistance becomes negligible at very low temperatures.
A state where only semiconductors function.
Which material is mentioned as showing superconductivity?
Copper
Manganin
Lead
Silicon
The resistance of thermistors _____.
increases with temperature
remains unchanged with temperature
falls as temperature rises
becomes zero at room temperature
What do the words "they" refer to in the sentence: "Under certain conditions, they allow a current to flow easily but under others they behave as insulators"?
Conductors
Metallic oxides
Semiconductors
Insulators
Which of the following statements is false?
All metals are good conductors.
Salt water can conduct electricity.
Rubber is an example of an insulator.
Germanium is a semiconductor.
Which sentence best describes the relationship between temperature and resistance in metals?
Resistance remains constant with temperature changes.
Resistance increases as temperature decreases.
Resistance increases as temperature increases.
Resistance does not depend on temperature.
What does a voltmeter measure?
Resistance
Current
Voltage
Frequency
What is the correct way to connect a voltmeter in a circuit?
In series
In parallel
In both series and parallel
No connection required
Which instrument is used to measure electrical current?
Ammeter
Ohmmeter
Voltmeter
Thermometer
Where should an ammeter be placed in a circuit?
In parallel with the resistor
In series with the component
Outside the circuit
On the negative terminal only
How does an ohmmeter work?
It applies a small internal voltage across the component and measures current to calculate resistance.
It measures the magnetic field around a live wire to determine resistance.
It counts the number of electrons passing a point per second to display resistance.
It compares the component length to a calibrated scale to find resistance.
Which measuring device is used only when the component is not powered?
Voltmeter
Ammeter
Ohmmeter
Multimeter
A digital multimeter (DVOM) can measure:
Only voltage and current
Only resistance
Voltage, resistance, and many other quantities
Temperature only
Which of the following can a multimeter measure?
Voltage
Current
Resistance
All of the above
Why can't you measure resistance with an ohmmeter while the component is connected in a powered circuit?
Because the current is too weak.
Because the ohmmeter uses its own voltage source.
Because it may burn out the resistor.
Because the battery is not charged.
What do the words “its own source of voltage” in the sentence “… depends only on its own source of voltage” refer to?
The component
The circuit
The ohmmeter
The resistor
What is required to properly measure current with an ammeter?
It must be connected in parallel.
It must be connected in series and powered.
It must be connected to a voltmeter.
It must be disconnected from the power source.
What is the path that electric current follows called?
Wire
Battery
Circuit
Load
What does the source in a circuit provide?
Light
Resistance
Electromotive force
Heat
Which of the following is an example of a load?
A switch
A lamp
A wire
A battery
What is the function of the transmission system in a circuit?
To store electrical energy
To convert electricity into heat
To conduct current around the circuit
To reduce voltage
In the flashlight example, what component acts as the control?
The bulb
The metal body
The battery
The sliding switch
Which of the following could be a source in an electric circuit?
Lamp
Resistor
Battery
Wire
In the satellite circuit, what type of energy is converted into electrical energy by the solar cells?
Thermal energy
Nuclear energy
Light energy
Sound energy
What activates the relay in the satellite?
The solar cell
The television camera
Ground control transmissions
Connecting wires
Which statement is true about the flashlight and satellite circuits?
They have different basic components.
They both use a battery of solar cells.
They both contain a source, load, transmission system, and control.
Only the satellite has a transmission system.
What does the term electromotive force mean in the context of the circuit?
The force required to stop the current
The resistance in a conductor
The energy per unit charge provided by the source
The speed of the current
Why can the metal body of a car or flashlight be used in a transmission system?
It acts as a switch.
It increases resistance.
It is non-conductive.
It is a conductor and can carry current.
Which household appliance uses the heating effect of electric current?
Electric fan
Electric generator
Rice cooker
LED light
What is the color of light produced by a mercury vapor lamp?
Yellow
White
Greenish-blue
Red
What is produced around a conductor when electric current flows through it?
Resistance
Light rays
High temperature
Magnetic field
What is the name of the process where electric current separates a chemical compound?
Chemical fusion
Electro-chemistry
Electrolysis
Magnetization
Why does the filament in a light bulb glow?
It is made of a special material.
The current creates a magnetic field.
The filament becomes ionized.
The filament becomes incandescent.
In a transformer, where is current induced when there is a change in the primary coil?
Magnetic coil
Secondary coil
Conducting wire
Auxiliary coil
Which of the following is not an effect of electric current?
Chemical
Mechanical
Optical
Gravitational
What must be added to pure water to make electrolysis occur effectively?
Oxygen
Chlorine
Sulphuric acid
Distilled water
What happens when a magnetic field is cut by another conductor?
The wire gets heated.
Light is produced.
An electromagnetic force appears.
An electromotive force is induced.
In an electric relay, what does the magnetic field do?
Heats the coil
Activates an amplifier
Attracts magnetic materials
Emits light
In an electric motor, when current flows through a conductor placed in a magnetic field, what happens?
Bright light is emitted.
A mechanical force is produced.
High voltage is generated.
The magnetic field is destroyed.
What is the unit of electrical resistance?
Ampere
Volt
Ohm
Watt
Which of the following is a good conductor?
Glass
Paper
Silver
Wood
What is the main function of a resistor?
To increase voltage
To generate electricity
To store energy
To oppose current flow
Which of the following materials has the lowest resistance?
Copper
Silver
Aluminum
Gold
What will happen to the resistance of copper if the temperature increases?
It stays the same.
It increases.
It decreases.
It becomes zero.
Which of the following is an insulator?
Aluminum
Gold
Wood
Copper
Resistance in a wire depends on all of the following except:
Length
Diameter
Color
Material
How many ohms of resistance allows 1 ampere of current to flow with 1 volt applied?
0.5 ohms
1 ohm
10 ohms
100 ohms
Which of the following has resistance that decreases as temperature increases?
Iron
Copper
Aluminum
Carbon
Which factor most closely resembles pipe friction in the water analogy?
Voltage
Wire length
Resistance
Current
Which statement is true about metal alloys in relation to resistance?
Their resistance increases rapidly with temperature.
Their resistance changes randomly.
Their resistance does not change significantly with temperature.
They have zero resistance.
Which of the following statements about the temperature effect on resistance is correct?
In all conductors, resistance decreases as temperature increases.
The resistance of carbon increases significantly with a rise in temperature.
Most metallic conductors experience increased resistance when heated, but carbon behaves oppositely.
Temperature changes do not affect resistance in any known materials.
What is the main function of a diode?
To store electricity
To emit sound
To allow current in both directions
To allow current in one direction only
What are the two terminals of a diode called?
Source and drain
Cathode and anode
Input and output
Positive and negative
What material is mainly used to make modern diodes?
Copper
Aluminum
Doped silicon
Plastic
What is the area where the p-side and n-side meet called?
Diode core
Junction box
Semiconductor gate
p-n junction
Which of the following is a common use of diodes in power supplies?
Current amplification
Voltage storage
AC to DC conversion
Signal boosting
In an LED, what is emitted when an electron crosses the junction?
Heat
Sound
Photon
Neutron
What determines the color of light in an LED?
The size of the diode
The shape of the circuit
The type of doping
The voltage rating
What are “transient voltage suppressors” used for?
To boost voltage
To convert DC to AC
To store energy
To protect from voltage spikes
In which direction do electrons flow in a forward-biased diode?
From p-side to n-side
From positive to negative
From anode to cathode
From n-side to p-side
What is the term used when a diode blocks current in the high-resistance direction?
Forward bias
Open circuit
Reverse-biased
Overloaded
What kind of diode can glow when forward-biased?
Zener diode
LED
Rectifier diode
Schottky diode
What material is most commonly used to make modern transistors?
Aluminum
Selenium
Silicon
Mercury
What is a semiconductor?
A perfect insulator
A perfect conductor
A material with conductivity between a conductor and insulator
A material that doesn’t conduct at all
What element is used in light-sensitive transistors?
Germanium
Gallium arsenide
Silicon
Copper
What are the three parts of a transistor?
Anode, Cathode, Grid
Source, Gate, Drain
Emitter, Collector, Base
Positive, Negative, Ground
Which structure was the first type of transistor developed?
pnp
nnn
npn
pnpn
What is the function of doping a semiconductor?
To make it larger
To increase purity
To control its electrical properties
To color the material
What happens when n-type and p-type semiconductors are placed together?
They create an insulator.
Current flows in both directions.
Current is rectified and flows in one direction only.
The material becomes magnetic.
Which of the following was not a reason transistors were preferred over vacuum tubes?
They were much smaller.
They were more fragile.
They used less power.
They produced less heat.
What type of impurity creates a p-type semiconductor?
Phosphorus
Arsenic
Boron
Antimony
What year was the transistor developed?
1945
1947
1948
1950
Which is a correct function of transistors in a circuit?
Battery replacement
Light generation
Signal amplification
Wire insulation
Which of the following best explains why silicon is preferred over germanium in making transistors?
It’s more conductive.
It’s easier to melt.
It’s more rare and expensive.
It’s more abundant and readily available.
How many terminals does a Field Effect Transistor (FET) have?
One
Two
Three
Four
What are the names of the terminals in a FET?
Base, Collector, Emitter
Anode, Cathode, Gate
Source, Drain, Gate
Source, Base, Emitter
What kind of amplifier is a FET?
Power amplifier
Sound amplifier
Current amplifier
Voltage amplifier
What is the function of the depletion band in a FET?
It boosts current.
It increases voltage.
It blocks electrons from entering the gate.
It charges the gate.
What causes the depletion band to become wider in a FET?
Increasing the source voltage
Increasing the gate voltage
Lowering the gate voltage
Raising the drain voltage
What happens when the external circuit has high resistance?
Electrons flow faster.
Electrons are blocked.
Electrons leave the drain slowly.
Depletion band disappears.
What is the negative terminal of a FET?
Drain
Base
Gate
Source
Which terminal in a FET controls the width of the channel?
Source
Gate
Drain
Emitter
When the gate is not connected, what happens in a FET?
No current flows at all.
Electrons are blocked from flowing.
Current flows easily from source to drain.
The device shuts down.
Why is a FET more economical than a bipolar transistor?
It uses more power.
It operates at high temperatures.
It requires smaller current for control.
It has more complex wiring.
