Your complete NEP-ready study guide for Class 9 Work Education.
Work Education Class 9 introduces students to essential practical knowledge of electrical systems, safety devices, house wiring, motors, generators, electronic components, and measurement tools. This Work Education Class 9 Study Material 2025, created with guidance from a2zly.com, is designed according to NCERT + NEP 2025 competencies to help Class 9 students gain hands-on understanding, safety awareness, and real-life application skills.
The chapter progresses from basic safety devices to electromagnetism, motors & generators, switchboard connections, and modern electronics—ensuring students develop both conceptual understanding and practical competency through this comprehensive Work Education Class 9 Study Material 2025 offered by a2zly.com.
After studying this chapter, students will be able to:
Safety devices are the foundation of electrical protection in Work Education Class 9. They prevent shocks, short circuits, overloads, and fire hazards, making electricity safer to use in homes and schools. This Work Education Class 9 Study Material 2025 briefly explains key safety devices like fuses, MCBs, ELCBs/RCCBs, isolators, and earthing so that Class 9 students can understand their purpose and real-life importance.
Below is the detailed explanation of the commonly used Fuse, MCB, ELCB/RCCB, and Isolators.
A fuse works on the principle that:
A thin metal wire melts when too much current flows through it.
This happens because excess current makes the wire very hot, and at a certain point, the wire breaks (melts).
A fuse protects:
It prevents damage caused by:
If the current rating of a fuse is 5A, and more than 5A flows, the fuse wire will melt to protect the circuit
Circuit breakers are improved safety devices used in modern homes. Unlike fuses, they do not need replacement after a fault. They can be reset easily.
An MCB protects the electrical circuit from:
It is commonly used in household distribution boards.
ELCB/RCCB is used mainly to protect humans from electrical shocks.
ELCB/RCCB constantly compares the current in:
If there is any difference, it means some current is leaking to earth (possibly through a human body).
Example:
A person accidentally touches a live wire → current may pass through their body to the ground → this is leakage.
Whenever leakage occurs → ELCB/RCCB trips immediately and cuts off the electricity.
This prevents:
An isolator is a manual switch used to completely disconnect a part of the circuit for safety during maintenance or repair.
Unlike MCB or ELCB, an isolator does not trip automatically.
It must be operated manually.
There are mainly two types used in domestic and industrial supply:
| Safety Device | Protects From | Working Principle | Automatic/Manual | Reusable? |
|---|---|---|---|---|
| Fuse | Overload, short circuit | Wire melts when current is high | Automatic (melts) | ❌ No (must replace) |
| MCB | Overload, short circuit | Switch trips automatically | Automatic | ✔ Yes (reset) |
| ELCB/RCCB | Electric shock, leakage | Detects current imbalance | Automatic | ✔ Yes |
| Isolator | Maintenance safety | Manual disconnection | Manual | ✔ Yes |
Earthing is one of the most important safety practices in Work Education Class 9, as it protects people and appliances from electric shock and voltage surges. This Work Education Class 9 Study Material 2025 helps Class 9 students understand how earthing provides a safe path for fault current to flow into the ground, keeping electrical systems stable and secure.
Earthing means connecting the electrical system to the earth (ground) using a metal plate, rod, or pipe.
This provides a safe path for unwanted or extra current to flow into the ground.
Earthing protects both people and electrical devices. Here’s why it is important:
If a live wire accidentally touches the metal body of an appliance (like a refrigerator or washing machine), that metal becomes charged.
If you touch it, you may get a shock.
Earthing ensures:
Sometimes voltage suddenly increases due to:
Excess voltage can damage appliances.
Earthing helps by safely diverting this high voltage into the ground, preventing damage.
In case of any electrical fault, the extra current (fault current):
This makes the entire electrical system safer.
Earthing plays a major role in homes, schools, industries, and all buildings.
Earthing wire gives least resistance, so extra current prefers to flow through it rather than the human body.
It helps maintain:
This is especially important in places with sensitive equipment (computers, medical machines, etc.)
Several methods are used depending on the building and soil type.
Here are the three most commonly used types:
A metal plate (usually copper or galvanized iron) is:
A long metal rod (usually steel or copper) is:
A GI (Galvanized Iron) pipe is used instead of a plate or rod.
The pipe:
Earthing in homes is essential because:
✔ Washing machines, fridges, irons, and heaters have metal bodies
✔ Any fault can make the body live
✔ Without earthing, touching the appliance can cause a severe shock
✔ Earthing keeps the metal body at zero potential (safe level)
If a refrigerator develops a wiring fault:
This is possible only because of good earthing.
| Feature | Description |
|---|---|
| Purpose of Earthing | Prevents shock, protects appliances, stabilizes voltage |
| Path Provided | Low-resistance route to ground |
| Plate Earthing | Metal plate buried in earth |
| Rod Earthing | Long rod driven into soil |
| Pipe Earthing | GI pipe used (common at homes) |
| Main Benefit | Safety and protection from electrical faults |
Electromagnetism is a key scientific principle in Work Education Class 9, explaining how electricity and magnetism work together to create useful devices. This Work Education Class 9 Study Material 2025 introduces Class 9 students to magnetic fields, electromagnets, and their real-life applications, helping them understand how modern electrical systems operate.
Electromagnetism is the branch of physics that explains the relationship between electricity and magnetism.
Many devices around us—motors, generators, fans, speakers—work on the principles of electromagnetism.
In this chapter, you will learn two important ideas:
Let’s understand them one by one in simple language.
Electromagnetic Induction means:
A voltage (EMF) is produced in a conductor when the magnetic field around it changes.
This voltage can then produce current if the conductor is part of a closed circuit.
Faraday discovered that:
“Whenever the magnetic field (flux) around a conductor changes, an EMF (voltage) is induced (produced) in the conductor.”
This change can happen by:
If you move a magnet towards a coil → voltage is produced.
If you move the magnet away from the coil → voltage is produced again.
If you stop moving the magnet → no voltage is produced.
Conclusion:
Voltage is induced only when the magnetic field changes.
Faraday’s law is the working principle of many machines and devices:
Fleming created two hand rules to help us remember the direction of:
Depending on which device we are studying—motor or generator—we use different rules.
Used for electric motors, where:
This rule helps us find the direction of force (motion) on the conductor.
Stretch your left hand with:
Keep them at right angles to each other.
Each finger represents:
| Finger | Represents |
|---|---|
| Thumb | Force / Motion |
| First Finger | Magnetic Field (B) |
| Second Finger | Current (I) |
If current goes up and magnetic field goes into the page, the conductor moves in the direction shown by the thumb.
This is how fans, mixers, electric motors work.
Used for electric generators, where:
This rule helps us find the direction of induced current.
Stretch your right hand the same way as left-hand rule.
Each finger represents:
| Finger | Represents |
|---|---|
| Thumb | Motion of conductor |
| First Finger | Magnetic Field |
| Second Finger | Induced Current |
When a coil rotates inside a magnet in a generator, the direction of induced current is given by this rule.
This is how electricity is produced in:
| Feature | Left-Hand Rule | Right-Hand Rule |
|---|---|---|
| Used For | Motors | Generators |
| Purpose | Find direction of force/motion | Find direction of induced current |
| Current Present? | Yes, supply current already present | No, current produced by movement |
| Hand Used | Left hand | Right hand |
✔ Voltage is produced when magnetic field around a coil changes.
✔ Used in generators, transformers, induction cookers.
✔ Thumb = Force
✔ First finger = Magnetic field
✔ Second finger = Current
✔ Thumb = Motion
✔ First finger = Magnetic field
✔ Second finger = Induced current
Motors and generators are important machines studied in Work Education Class 9, showing how electrical energy can be converted into motion and how motion can be converted back into electricity. This Work Education Class 9 Study Material 2025 helps Class 9 students understand the basic working principles, differences, and real-life uses of motors and generators in everyday appliances and industries.
Electric motors and electric generators are two of the most important machines used in daily life.
Although they look similar in structure, their purposes are completely opposite:
Let’s understand them in detail.
An electric motor is a device that converts electrical energy into mechanical energy (motion).
This motion is used to run fans, mixers, pumps, and many machines.
Electric motors work on the principle:
A current-carrying conductor placed in a magnetic field experiences a force.
This rule is explained by Fleming’s Left-Hand Rule.
The direction of force tells us how the coil or conductor will move.
This rotational motion can be used to run many appliances.
Electric motors are everywhere. Common uses include:
Motors make modern life convenient by converting electricity into useful mechanical work.
An electric generator is a device that converts mechanical energy into electrical energy.
It is the opposite of an electric motor.
Generators work on the principle of:
Electromagnetic induction
discovered by Faraday, which states:
When a coil moves in a magnetic field, an EMF is induced in it.
This induced EMF produces electric current.
Fleming’s Right-Hand Rule is used to determine the direction of this induced current.
Mechanical energy can come from:
Generators are used wherever electricity is needed.
| Feature | Motor | Generator |
|---|---|---|
| Energy Conversion | Electrical → Mechanical | Mechanical → Electrical |
| Principle | Fleming’s Left-Hand Rule | Faraday’s Law + Right-Hand Rule |
| Input | Electricity | Mechanical motion |
| Output | Motion | Electricity |
| Uses | Fans, machines | Power supply, charging, backup |
✔ Converts electrical energy into mechanical energy
✔ Uses Fleming’s left-hand rule
✔ Types: DC motor, induction motor, synchronous motor
✔ Uses: Fans, pumps, mixers, machines
✔ Converts mechanical energy into electrical energy
✔ Works on electromagnetic induction
✔ Types: AC generator, DC generator
✔ Uses: Power plants, vehicles, industries, emergency power
House wiring is an essential topic in Work Education Class 9, helping students understand how electrical circuits are safely installed in homes. This Work Education Class 9 Study Material 2025 guides Class 9 students through wiring components, switchboard connections, circuit layouts, and safety practices needed for proper household electrical installation.
House wiring is designed to safely deliver electricity to appliances like fans, lights, TVs, and refrigerators.
Understanding phase, neutral, earth, and why the switch must always be on the phase wire is essential for electrical safety.
Every electrical device in a house—bulb, fan, TV, fridge—needs three main wires for safe and proper working:
👉 Color Code (Commonly Used): Red / Brown / Yellow
👉 Color Code: Black / Blue
👉 Color Code: Green
| Wire Type | Purpose |
|---|---|
| Phase | Supplies current to the appliance |
| Neutral | Returns current to complete the circuit |
| Earth | Safety wire to prevent shock and protect appliances |
Without these three wires, electrical systems would be unsafe and may not work properly.
This is one of the most important safety rules in house wiring.
When you place a switch on the phase wire:
👉 This is safe and correct wiring.
If the switch is mistakenly connected to neutral:
👉 This is dangerous and must be avoided.
Imagine a bulb where:
Even if the switch is OFF, the bulb holder still has live 240 V inside it.
Touching it can cause a serious electric shock.
Phase → Switch → Appliance → Neutral
Neutral → Switch → Appliance ← Phase
Earth wire is connected to:
✔ Prevents shock
✔ Discharges leakage current
✔ Protects electronics from damage
✔ Works with RCCB/ELCB to trip during leakage
| Feature | Description |
|---|---|
| Phase Wire | Carries live current, dangerous |
| Neutral Wire | Completes the circuit |
| Earth Wire | Safety path for fault current |
| Switch in Phase | Makes appliance safe when OFF |
| Switch in Neutral | Hazardous, appliance stays live |
When the fan switch is OFF:
Three holes represent:
Earth ensures safety for iron, geyser, fridge, etc.
If switch is on neutral, touching the bulb holder can cause shock even when switch is OFF.
Switchboard connections are an important part of electrical installation in Work Education Class 9, helping students understand how switches, sockets, and appliances are safely connected. This Work Education Class 9 Study Material 2025 explains different types of switchboard connections in a simple way so Class 9 students can learn their purpose, wiring method, and real-life applications.
There are different types of switchboard connections depending on how many loads (devices) and switches are used.
Let’s understand each type with clear explanations and real-life examples.
One switch controls one electrical load, such as:
The switch is connected in the phase wire going to the bulb.
When the switch is ON → bulb glows.
When the switch is OFF → bulb goes off.
A normal room bulb controlled by a single switch.
Two separate switches control two different loads.
Example loads:
Each switch is wired in series with its respective load.
Example:
Turning ON one switch does not affect the other device.
Kitchen, bedroom, drawing room.
A single light (usually staircase light or hall light) can be controlled from two different places.
Uses two-way switches that change connection paths.
Either switch can turn the light ON or OFF, regardless of the other switch’s position.
Turning the staircase light ON at the bottom and OFF at the top.
One switch controls two loads together.
The phase wire splits into two wires after the switch, each going to a separate load.
When switch is ON → both loads operate simultaneously.
When switch is OFF → both turn OFF.
Useful when two lights are meant to run together.
A switch installed near the bed, allowing the user to control room lights without getting up.
The bed switch is connected in parallel with the main switch (door switch) for the same light.
This allows:
Convenience and safety (especially at night).
To protect:
Fuse is always placed before the switch in the phase wire.
If there is:
Fuse protects the entire switchboard connected after it.
A tube light requires additional components along with the switch.
Homes, classrooms, offices, shops.
| Type of Connection | Description |
|---|---|
| One Load – One Switch | One switch controls one bulb/fan |
| Two Loads – Two Switches | Each load has its own switch |
| One Load – Two Switches | Staircase wiring, control from two points |
| Two Loads – One Switch | Both loads operate together from one switch |
| Bed Switch | Light controlled from both door and bed |
| Fuse in Switchboard | Protects circuit from overload |
| Tube Light Connection | Includes choke, starter, tube, and switch |
Bulbs and tube lights are common lighting devices studied in Work Education Class 9, helping students understand how electrical energy is converted into light. This Work Education Class 9 Study Material 2025 explains the working principles, components, and differences between bulbs and tube lights so Class 9 students can connect the concepts to real-life household lighting.
Electrical energy is converted into light energy.
When electric current flows through a bulb or tube light, it produces:
Different bulbs convert electricity into light with different levels of efficiency.
There are many light sources used in households and industries. The main types are:
LEDs use semiconductor materials that emit light when current passes through them.
✔ Save 80–90% electricity
✔ Very bright
✔ Very long-lasting
✔ Eco-friendly
Different environments require different types of lighting.
Saving electricity is important. The best power-saving lighting systems are:
Tube lights are widely used in homes, schools, shops, and offices.
A tube light consists of:
| Type | Efficiency | Heat Production | Lifespan | Uses |
|---|---|---|---|---|
| Incandescent | Very low | Very high | Short | Rarely used |
| Halogen | Low | Very high | Short | Headlights, floodlights |
| CFL | Medium | Low | Long | Homes, shops |
| LED | Highest | Very low | Longest | Homes, offices, streets |
| Tube Light | Medium | Low | Long | Homes, offices |
Electrical instruments play a key role in Work Education Class 9, helping students measure voltage, current, resistance, and check the condition of circuits. This Work Education Class 9 Study Material 2025 introduces important tools like testers, ammeters, voltmeters, and multimeters so Class 9 students can understand their use, purpose, and importance in safe electrical work.
In electrical circuits, we often need to measure different quantities such as current, voltage, and resistance.
To measure these values accurately, we use specialized instruments.
The most commonly used instruments are:
Let’s study them in detail.
An ammeter is an electrical instrument used to measure electric current flowing through a circuit.
An ammeter has very low resistance.
Why?
Ammeter is always connected in series with the load.
Because the low resistance will cause large current to flow, damaging the instrument.
A voltmeter measures the potential difference (voltage) between two points in a circuit.
A voltmeter has very high resistance.
Why?
A voltmeter is always connected in parallel with the component whose voltage is to be measured.
It will block the current because of its high resistance.
A multimeter is a multi-purpose instrument that can measure:
It is also called a VOM (Volt-Ohm-Milliammeter).
Modern multimeters use electronic sensing circuits and microprocessors to measure different electrical quantities.
A multimeter has multiple ports and a rotating selector knob.
You can measure:
| Instrument | Measures | Resistance | Connection | Types |
|---|---|---|---|---|
| Ammeter | Current | Very low | Series | Analog, Digital |
| Voltmeter | Voltage | Very high | Parallel | Analog, Digital |
| Multimeter | Voltage, current, resistance, continuity | Medium (varies) | Series/Parallel depending on use | Analog, Digital (DMM) |
Electronics is an important part of Work Education Class 9, helping students understand basic components like resistors, capacitors, LEDs, transistors, and their role in simple circuits. This Work Education Class 9 Study Material 2025 makes these concepts easy for Class 9 students by explaining how electronic components work and how they are used in everyday devices.
In this chapter, we will learn about:
A soldering iron is a hand tool used to join electronic components by melting solder.
It is widely used in electronics, electrical repair work, and PCB assembly.
A soldering iron works on the principle of resistance heating:
Every electronic device—from mobile phones to calculators—contains a combination of small components.
Let’s study the three most basic and essential ones.
A resistor is an electronic component that opposes or limits the flow of current.
Resistors have colored bands printed on them that represent their value in ohms (Ω).
Students at higher classes learn to decode these colors.
Example colors:
Each color corresponds to a number.
A capacitor is a device that stores electrical charge temporarily.
Electrolytic capacitors have positive (+) and negative (-) terminals.
They must be connected correctly.
An LED is a special diode that glows when electric current flows through it.
| Component | Function | Connection/Principle | Examples of Use |
|---|---|---|---|
| Soldering Iron | Melts solder to join components | Resistance heating | PCB assembly, repairs |
| Resistor | Limits current, reduces voltage | Ohm’s Law, fixed value | LED circuits, dividers |
| Capacitor | Stores charge, filters voltage | Charge–discharge property | Power supplies, timing |
| LED | Produces light when current flows | Diode conduction | Indicators, displays |
✔ Soldering iron converts electricity into heat for joining components.
✔ Resistors limit current and help control voltage.
✔ Capacitors store charge and smooth signals.
✔ LEDs produce light with very little power.
Diodes and transistors are key semiconductor components studied in Work Education Class 9, helping students understand how modern electronic devices control current flow and amplify signals. This Work Education Class 9 Study Material 2025 explains the working, types, and applications of diodes and transistors in a simple way so Class 9 students can connect these concepts to real-life electronics.
Electronics is built from small but powerful components.
Two of the most important components are:
These are used in almost every electronic device—mobiles, computers, chargers, TVs, radios, etc.
Let’s understand them in an easy way.
A diode is an electronic component that allows electric current to flow in only one direction.
It works like a one-way traffic gate for electricity.
A triangle arrow pointing toward a line:
→|—
A diode can work in two modes:
Diodes are used for:
✔ Mobile chargers use rectifier diodes
✔ LED bulbs use LED diodes
✔ Power supplies use bridge rectifiers
A transistor is a semiconductor device that can:
It is called the heart of modern electronics.
There are two major families:
BJTs have two main types:
A BJT has 3 terminals:
| Terminal | Function |
|---|---|
| Emitter | Emits charge carriers |
| Base | Controls current |
| Collector | Collects charge carriers |
A FET has:
| Terminal | Function |
|---|---|
| Gate | Controls voltage |
| Source | Input terminal |
| Drain | Output terminal |
A small mic signal can control a loudspeaker sound → amplification.
Transistors are used in almost every modern electronic device.
Transistors can turn ON/OFF:
Amplifies:
Used in:
| Device | Controlled By | Direction of Current | Main Use |
|---|---|---|---|
| Diode | Fixed behavior | One direction only | Rectification, protection |
| BJT Transistor | Current | Both directions (depending on bias) | Switching, amplification |
| FET Transistor | Voltage | Controlled flow | Low-power switching |
Ohm’s Law is a fundamental concept in Work Education Class 9, explaining the relationship between voltage, current, and resistance in an electrical circuit. This Work Education Class 9 Study Material 2025 helps Class 9 students understand how the formula V=IRV = IRV=IR is used to calculate and analyze simple electrical circuits in real-life applications.
Electric circuits contain components like bulbs, resistors, motors, and wires.
To understand how voltage, current, and resistance are related in a circuit, we use a fundamental rule of electricity called Ohm’s Law.
This law is the foundation of electrical science and appears in almost every exam.
Ohm’s Law states that:
Voltage (V) across a conductor is directly proportional to the current (I) flowing through it, provided the temperature remains constant.
In simple words:
The mathematical form of Ohm’s Law is:
Where:
Example:
Example: A bulb will glow brighter if voltage increases.
Example: A long thin wire allows less current.
Example: A thick copper wire carries more current.
Total resistance increases:
Rₜ = R₁ + R₂ + R₃
Current remains the same in all components.
Total resistance decreases:
1/Rₜ = 1/R₁ + 1/R₂ + 1/R₃
Voltage remains same across all components.
Engineers use Ohm’s Law to calculate safe current for appliances.
To protect LEDs or transistors, we choose resistors using V = IR.
Helps determine wire thickness required to carry certain current.
Helps calculate how much current flows at a given voltage.
Heating depends on resistance and current (P = I²R).
A current of 2 A flows through a resistor of 5 Ω.
Find voltage.
Using V = IR
V = 2 × 5 = 10 V
Voltage = 12 V, Resistance = 6 Ω
Current?
I = V / R
I = 12 / 6 = 2 A
Voltage = 9 V, Current = 3 A
Resistance?
R = V / I
R = 9 / 3 = 3 Ω
Ohm’s Law works only when:
✔ Temperature remains constant
✔ Material remains unchanged
✔ Current is not too high
✔ The conductor is “ohmic” (follows Ohm’s Law)
Devices like LEDs, diodes, transistors do NOT follow Ohm’s Law strictly.
| Quantity | Symbol | Unit | Measured By |
|---|---|---|---|
| Voltage | V | Volt (V) | Voltmeter |
| Current | I | Ampere (A) | Ammeter |
| Resistance | R | Ohm (Ω) | Ohmmeter / Multimeter |
This set of MCQs is designed to help students of Work Education Class 9 revise all important safety devices such as fuses, MCBs, RCCBs/ELCBs, and isolators. These Work Education Class 9 Study Material 2025 questions strengthen understanding of how safety devices protect circuits from overload, short circuits, and electric shock, making them essential for Class 9 learners preparing for exams and practical applications.
a) To increase current
b) To protect the circuit from overload
c) To store electricity
d) To measure voltage
Answer: b) To protect the circuit from overload
a) High melting point
b) Very low melting point
c) No melting point
d) High resistance to melting
Answer: b) Very low melting point
a) Expands
b) Melts and breaks the circuit
c) Allows more current
d) Starts glowing
Answer: b) Melts and breaks the circuit
a) Fuse
b) MCB
c) Fuse carrier
d) Filament bulb
Answer: b) MCB
a) Maximum Current Breaker
b) Mini Current Blocker
c) Miniature Circuit Breaker
d) Minimum Circuit Breaker
Answer: c) Miniature Circuit Breaker
a) MCB
b) Fuse
c) ELCB/RCCB
d) Transformer
Answer: c) ELCB/RCCB
a) Excessive heat
b) Current imbalance between live and neutral
c) Low voltage
d) Speed of current
Answer: b) Current imbalance between live and neutral
a) MCB
b) RCCB
c) Isolator
d) Fuse
Answer: c) Isolator
a) Low voltage
b) Overheating due to overcurrent
c) Low current
d) Electric bill increase
Answer: b) Overheating due to overcurrent
a) Batteries
b) MCBs
c) Motors
d) Transformers
Answer: b) MCBs
a) Normal power supply
b) Maintenance or repair
c) Power generation
d) Rainy season
Answer: b) Maintenance or repair
a) Voltage increases
b) Current exceeds safe limit
c) Battery is low
d) Fan speed increases
Answer: b) Current exceeds safe limit
a) Copper
b) Nichrome
c) Aluminium
d) Tin-lead alloy
Answer: d) Tin-lead alloy
a) One-pole
b) Two-pole
c) Four-pole
d) Five-pole
Answer: c) Four-pole
a) 0.1 mA
b) 10 mA
c) 30 mA
d) 1 A
Answer: c) 30 mA
a) Switch
b) Isolator
c) Plug
d) Extension board
Answer: b) Isolator
a) Cannot protect from fire
b) Needs replacement after melting
c) Works very slowly
d) Is very expensive
Answer: b) Needs replacement after melting
a) It is colorful
b) It can be reset easily
c) It works on batteries
d) It does not trip
Answer: b) It can be reset easily
a) MCB
b) RCCB
c) Fuse
d) Overload relay
Answer: b) RCCB
a) Voltage becomes very high
b) Two wires touch each other
c) Current becomes zero
d) Switch is off
Answer: b) Two wires touch each other
a) MCB
b) Fuse
c) RCCB
d) Switch
Answer: c) RCCB
a) Volts
b) Ohms
c) Amperes
d) Hertz
Answer: c) Amperes
a) MCB
b) Isolator
c) Socket
d) Bulb
Answer: a) MCB
a) Lamps
b) Wet areas like bathroom/kitchen
c) Loudspeaker circuits
d) Street lights
Answer: b) Wet areas like bathroom/kitchen
a) Earth
b) Neutral
c) Live
d) Any wire
Answer: c) Live
a) Middle/off position
b) UP position
c) Down position forcibly
d) Moves randomly
Answer: a) Middle/off position
a) MCB
b) Isolator
c) Plug top
d) Meter
Answer: b) Isolator
a) Residual Current Circuit Block
b) Residual Circuit Breaker
c) Residual Current Circuit Breaker
d) Required Current Breaker
Answer: c) Residual Current Circuit Breaker
a) High resistance
b) High melting point
c) Low melting point
d) High thickness
Answer: c) Low melting point
a) MCB melts
b) MCB trips
c) Nothing happens
d) Devices get damaged
Answer: b) MCB trips
This collection of MCQs helps Work Education Class 9 students strengthen their understanding of earthing and its safety importance. These questions, aligned with Work Education Class 9 Study Material 2025, ensure Class 9 learners can confidently explain how earthing provides a safe path for fault current, prevents electric shock, and protects electrical appliances.
a) To increase current flow
b) To prevent electric shock
c) To store electricity
d) To reduce resistance in wires
Answer: b) To prevent electric shock
a) High-resistance
b) Low-resistance
c) Medium-resistance
d) No-resistance
Answer: b) Low-resistance
a) Appliance
b) Transformer
c) Human body
d) Earth
Answer: d) Earth
a) Overheating
b) Electric shock
c) Voltage surge damage
d) All of these
Answer: d) All of these
a) Short circuit
b) Voltage surge
c) Power drop
d) Current leak
Answer: b) Voltage surge
a) Current
b) Voltage level
c) Resistance
d) Frequency
Answer: b) Voltage level
a) Pipe earthing
b) Rod earthing
c) Plate earthing
d) Terminal earthing
Answer: c) Plate earthing
a) Plastic
b) Rubber
c) Copper or galvanized iron
d) Wood
Answer: c) Copper or galvanized iron
a) Horizontally
b) Angularly
c) Vertically
d) Randomly
Answer: c) Vertically
a) Plate earthing
b) Rod earthing
c) Pipe earthing
d) None of these
Answer: c) Pipe earthing
a) PVC
b) GI (Galvanized Iron)
c) Bamboo
d) Steel-plastic
Answer: b) GI (Galvanized Iron)
a) Passing air
b) Moisture circulation
c) Storing water
d) Cooling the pipe
Answer: b) Moisture circulation
a) Desert areas
b) Rocky areas
c) Wetlands
d) Snowy regions
Answer: b) Rocky areas
a) Appliance turns off
b) Risk of electric shock
c) Appliance becomes safer
d) Voltage becomes zero
Answer: b) Risk of electric shock
a) High potential
b) Zero potential
c) Medium potential
d) Negative potential
Answer: b) Zero potential
a) Fuse
b) RCCB / ELCB
c) Switch
d) Socket
Answer: b) RCCB / ELCB
a) Bedrooms
b) Dry storage rooms
c) Bathrooms and kitchens
d) Classrooms
Answer: c) Bathrooms and kitchens
a) Decoration
b) Improve conductivity
c) Increase resistance
d) Reduce soil moisture
Answer: b) Improve conductivity
a) Unstable
b) Safer
c) Faster
d) More expensive
Answer: b) Safer
a) Cheapest and effective
b) Hard to install
c) Only for industries
d) Not long-lasting
Answer: a) Cheapest and effective
a) Pipe earthing
b) Plate earthing
c) Rod earthing
d) No earthing needed
Answer: b) Plate earthing
a) Safe current
b) Excess or fault current
c) Normal current
d) No current
Answer: b) Excess or fault current
a) Overuse
b) Overheating
c) Damage from high voltage
d) Mechanical wear
Answer: c) Damage from high voltage
a) They use more electricity
b) They heat up easily
c) They need stable voltage
d) They are heavy
Answer: c) They need stable voltage
a) Air
b) Human body
c) Ground directly
d) Ceiling
Answer: b) Human body
a) Appliances work faster
b) Risk of shock increases
c) Electricity bill reduces
d) Wires become stronger
Answer: b) Risk of shock increases
a) Wiring
b) Earthing
c) Insulating
d) Charging
Answer: b) Earthing
a) Expensive
b) Complicated
c) Stable
d) Decorative
Answer: c) Stable
a) Into the human body
b) Into the earth
c) Back to the meter
d) Into the switchboard
Answer: b) Into the earth
a) Only industries
b) Only schools
c) Almost all buildings
d) Only factories
Answer: c) Almost all buildings
This set of MCQs helps Work Education Class 9 students revise key concepts of electromagnetism, including magnetic fields, electromagnets, and their applications. Prepared as part of the Work Education Class 9 Study Material 2025, these questions strengthen Class 9 learners’ understanding of how electricity and magnetism work together in real-life devices.
a) Heat and light
b) Electricity and magnetism
c) Sound and waves
d) Pressure and volume
Answer: b) Electricity and magnetism
a) Current is constant
b) Magnetic field around a conductor changes
c) Temperature increases
d) Voltage is high
Answer: b) Magnetic field around a conductor changes
a) Resistance
b) Induced EMF
c) Heat energy
d) Static charge
Answer: b) Induced EMF
a) Moving a magnet near a coil
b) Keeping a magnet still
c) Keeping a coil still
d) Heating the coil
Answer: a) Moving a magnet near a coil
a) Ohm’s Law
b) Faraday’s Law
c) Coulomb’s Law
d) Archimedes’ Principle
Answer: b) Faraday’s Law
a) Burns
b) Rotates
c) Breaks
d) Shrinks
Answer: b) Rotates
a) Generators
b) Motors
c) Batteries
d) Solar panels
Answer: b) Motors
a) Motors
b) Transformers
c) Generators
d) Switches
Answer: c) Generators
a) Current
b) Magnetic field
c) Force or motion
d) Voltage
Answer: c) Force or motion
a) Heat
b) Induced current
c) Force
d) Voltage
Answer: b) Induced current
a) Magnetic field
b) Force
c) Current
d) Resistance
Answer: a) Magnetic field
a) Electricity → Motion
b) Motion → Electricity
c) Heat → Electricity
d) Light → Motion
Answer: a) Electricity → Motion
a) Electricity → Motion
b) Motion → Electricity
c) Sound → Motion
d) Light → Electricity
Answer: b) Motion → Electricity
a) Fan motor
b) Generator
c) Transformer
d) Electric bell
Answer: a) Fan motor
a) Electric motor
b) DC fan
c) Generator
d) Battery charger
Answer: c) Generator
a) Constant magnet
b) Changing magnetic field
c) Constant current
d) High temperature
Answer: b) Changing magnetic field
a) Zero
b) Smaller
c) Larger
d) Negative
Answer: c) Larger
a) Mechanical force
b) Electromagnetic induction
c) Heat transfer
d) Chemical reaction
Answer: b) Electromagnetic induction
a) Magnet only
b) Coil only
c) Either magnet or coil
d) Both must be still
Answer: c) Either magnet or coil
a) Vacuum
b) Magnetic field
c) Water bath
d) Plastic tube
Answer: b) Magnetic field
a) Heat and coil
b) Magnetic field and current
c) Charge and light
d) Resistance and power
Answer: b) Magnetic field and current
a) Force
b) Current
c) Magnetic field
d) Induced EMF
Answer: b) Current
a) Left-Hand Rule
b) Newton’s Law
c) Right-Hand Rule
d) Ampere’s Law
Answer: c) Right-Hand Rule
a) Heat
b) EMF
c) Pressure
d) Sound
Answer: b) EMF
a) Magnet
b) Rotor
c) Core
d) Terminal
Answer: b) Rotor
a) Generator
b) Transformer
c) Electric motor
d) Solar panel
Answer: d) Solar panel
a) More EMF
b) Less EMF
c) No EMF
d) Noise only
Answer: a) More EMF
a) Color of magnet
b) Speed of motion
c) Direction of motion
d) Shape of coil
Answer: c) Direction of motion
a) Magnetic field
b) Vacuum
c) Glass tube
d) Neutral zone
Answer: a) Magnetic field
a) Heating coil
b) Light bulb
c) Generator
d) Solar heater
Answer: c) Generator
This MCQ set helps Work Education Class 9 students revise the working principles of motors and generators, focusing on energy conversion and real-life applications. As part of the Work Education Class 9 Study Material 2025, these questions support Class 9 learners in understanding how electrical energy is turned into motion and how mechanical energy is converted back into electricity.
a) Mechanical → Electrical
b) Electrical → Mechanical
c) Heat → Light
d) Mechanical → Heat
Answer: b) Electrical → Mechanical
a) Mechanical → Electrical
b) Electrical → Mechanical
c) Heat → Electricity
d) Light → Motion
Answer: a) Mechanical → Electrical
a) Generators
b) Transformers
c) Motors
d) Batteries
Answer: c) Motors
a) Solar panels
b) Motors
c) Generators
d) Heaters
Answer: c) Generators
a) Magnetic field
b) Current
c) Force/Motion
d) Temperature
Answer: c) Force/Motion
a) Force direction
b) Magnetic field
c) Induced current
d) Voltage
Answer: c) Induced current
a) Ohm’s Law
b) Electromagnetic Induction
c) Heat Transfer
d) Newton’s Law
Answer: b) Electromagnetic Induction
a) Pressure
b) Force
c) Temperature change
d) Rotation of earth
Answer: b) Force
a) DC motor
b) Alternator
c) Transformer
d) Battery
Answer: a) DC motor
a) Induction motor
b) Synchronous motor
c) AC generator
d) BLDC motor
Answer: c) AC generator
a) AC supply
b) DC supply
c) Solar energy only
d) No electrical supply
Answer: b) DC supply
a) AC supply
b) DC supply
c) No supply
d) Solar power only
Answer: a) AC supply
a) DC motor
b) Induction motor
c) Synchronous motor
d) Hydraulic motor
Answer: b) Induction motor
a) DC generator
b) AC generator (alternator)
c) Battery generator
d) Solar generator
Answer: b) AC generator (alternator)
a) Mechanical energy
b) Electrical energy
c) Heat only
d) Light energy
Answer: a) Mechanical energy
a) Motor
b) Generator
c) Bulb
d) Transistor
Answer: b) Generator
a) Coil
b) Switch
c) Rotor
d) Armature
Answer: c) Rotor
a) Heat
b) Sound
c) Force
d) Pressure
Answer: c) Force
a) Generator
b) Electric motor
c) Transformer
d) Battery
Answer: b) Electric motor
a) Left-hand rule
b) Right-hand rule
c) Ohm’s rule
d) Maxwell’s rule
Answer: b) Right-hand rule
a) Wires melt
b) Force acts on the coil
c) Voltage drops
d) Air pushes it
Answer: b) Force acts on the coil
a) DC motor
b) Induction motor
c) Synchronous motor
d) AC generator
Answer: d) AC generator
a) Constant magnetic field
b) Changing magnetic field
c) No magnetic field
d) Heating of the coil
Answer: b) Changing magnetic field
a) Alternating current (AC)
b) Direct current (DC)
c) No current
d) Only heat
Answer: a) Alternating current (AC)
a) AC
b) DC
c) No electricity
d) Flickering current
Answer: b) DC
a) Motor
b) Alternator
c) Light
d) Pump
Answer: b) Alternator
a) Light
b) Motion
c) Water only
d) Heat only
Answer: b) Motion
a) Fans
b) Mixers
c) Drilling machines
d) All of the above
Answer: d) All of the above
a) Power plants
b) Emergency power supply
c) Industries
d) All of the above
Answer: d) All of the above
a) Both convert electrical energy to heat
b) Motor and generator work on opposite principles
c) Both produce mechanical motion
d) Both use chemical reactions
Answer: b) Motor and generator work on opposite principles
This set of MCQs helps Work Education Class 9 students revise important concepts of house wiring, including circuit layouts, switches, sockets, and safety practices. Prepared as part of the Work Education Class 9 Study Material 2025, these questions ensure Class 9 learners understand how household electrical systems are designed and safely operated.
a) One
b) Two
c) Three
d) Four
Answer: c) Three
a) Earth
b) Neutral
c) Live
d) Return
Answer: c) Live
a) High voltage
b) Zero or very low voltage
c) No current ever
d) Only AC
Answer: b) Zero or very low voltage
a) Neutral
b) Earth
c) Phase
d) All equally dangerous
Answer: c) Phase
a) Red
b) Blue
c) Green
d) Yellow
Answer: c) Green
a) To increase voltage
b) To provide a safe path for fault current
c) To reduce electricity bill
d) To cool appliances
Answer: b) To provide a safe path for fault current
a) Neutral
b) Earth
c) Phase
d) Any wire
Answer: c) Phase
a) Safe
b) Faster
c) Still live and dangerous
d) Grounded
Answer: c) Still live and dangerous
a) Full current
b) Half current
c) No current
d) Double current
Answer: c) No current
a) Neutral
b) Earth
c) Phase
d) Metal body
Answer: a) Neutral
a) Earth
b) Phase
c) Neutral
d) Live
Answer: c) Neutral
a) Phase
b) Neutral
c) Earth
d) Switch
Answer: c) Earth
a) Rust
b) Current leakage
c) Dust
d) Overheating
Answer: b) Current leakage
a) Neutral and earth
b) Phase and appliance
c) Phase and neutral
d) Earth and appliance
Answer: b) Phase and appliance
a) Phase
b) Neutral
c) Earth
d) Plastic wire
Answer: c) Earth
a) High potential
b) Zero potential
c) Negative potential
d) Fluctuating potential
Answer: b) Zero potential
a) Electric shock
b) Water leakage
c) Light flickering
d) High temperature
Answer: a) Electric shock
a) Appliance
b) Ground through earth wire
c) Neutral directly
d) Switch
Answer: b) Ground through earth wire
a) Earth
b) Phase
c) Neutral
d) None
Answer: b) Phase
a) Phase
b) Neutral
c) Earth
d) Live
Answer: c) Earth
a) Green
b) Black
c) Red/Brown/Yellow
d) White
Answer: c) Red/Brown/Yellow
a) Earth
b) Phase
c) Both wires
d) Battery
Answer: b) Phase
a) Accidents
b) Power loss
c) Fire hazards
d) All of these
Answer: d) All of these
a) Earth circuit
b) Neutral circuit
c) Phase circuit
d) Ground circuit
Answer: c) Phase circuit
a) Phase only
b) Phase and neutral
c) Phase, neutral, earth
d) Neutral and earth only
Answer: c) Phase, neutral, earth
a) 240 V
b) Zero potential
c) High potential
d) Negative potential
Answer: b) Zero potential
a) Loose wires
b) Electric shock
c) High speed
d) Breakage
Answer: b) Electric shock
a) 50 V
b) 110 V
c) 220–240 V
d) 500 V
Answer: c) 220–240 V
a) Switch
b) Lamp
c) Ground
d) Air
Answer: c) Ground
a) For decoration
b) For safety and proper working
c) For faster electricity
d) To reduce wires
Answer: b) For safety and proper working
This set of MCQs helps Work Education Class 9 students practice and revise different types of switchboard connections used in homes and classrooms. As part of the Work Education Class 9 Study Material 2025, these questions strengthen Class 9 learners’ understanding of how switches, sockets, regulators, and appliances are safely connected on a switchboard.
a) Two loads
b) One load
c) Three loads
d) No load
Answer: b) One load
a) One load – two switches
b) Two loads – one switch
c) One load – one switch
d) Bed switch
Answer: c) One load – one switch
a) Both loads together
b) Only the earth wire
c) One independent load
d) Neutral wire
Answer: c) One independent load
a) One load – one switch
b) Two loads – two switches
c) One load – two switches
d) Fuse connection
Answer: b) Two loads – two switches
a) Garden lighting
b) Kitchen wiring
c) Staircase wiring
d) TV connection
Answer: c) Staircase wiring
a) One point only
b) Two different points
c) Three points only
d) No switch
Answer: b) Two different points
a) One-way switches
b) Two-way switches
c) Fuse switches
d) Rotary switches
Answer: b) Two-way switches
a) Alternately
b) Only one works
c) Together
d) Only when fuse is removed
Answer: c) Together
a) One load – two switches
b) Two loads – one switch
c) Fuse connection
d) Bed switch
Answer: b) Two loads – one switch
a) Bathroom
b) Kitchen
c) Bed
d) Window
Answer: c) Bed
a) Fan speed
b) Doorbell
c) Room light
d) Refrigerator
Answer: c) Room light
a) Bed only
b) Door only
c) Both bed and door
d) Fan regulator
Answer: c) Both bed and door
a) Decoration
b) For convenience and safety
c) To increase power
d) To save electricity
Answer: b) For convenience and safety
a) After the switch
b) In the neutral wire
c) Before the switch in the phase wire
d) In the earth wire
Answer: c) Before the switch in the phase wire
a) Decorate the board
b) Increase voltage
c) Protect the circuit from overload
d) Switch off the motor
Answer: c) Protect the circuit from overload
a) Glows
b) Melts and breaks the circuit
c) Doubles current
d) Charges the battery
Answer: b) Melts and breaks the circuit
a) Hold the tube
b) Glow immediately
c) Help ionize gas inside the tube
d) Cool the tube
Answer: c) Help ionize gas inside the tube
a) Increasing temperature
b) Starting the tube by giving high voltage
c) Cooling the bulb
d) Reducing electricity bill
Answer: b) Starting the tube by giving high voltage
a) Switch
b) Starter
c) Choke/ballast
d) Holder
Answer: c) Choke/ballast
a) Fan
b) Switch
c) Fuse only
d) Motor
Answer: b) Switch
a) One load – one switch
b) Two loads – two switches
c) One load – two switches
d) Two loads – one switch
Answer: c) One load – two switches
a) Both are always OFF
b) Both run together
c) Only one runs at a time
d) They never work
Answer: b) Both run together
a) One-way
b) Two-way
c) Bed switch
d) Rotary switch
Answer: b) Two-way
a) Plastic casing only
b) The entire circuit connected after it
c) Only neutral wire
d) Only the switch
Answer: b) The entire circuit connected after it
a) Hospitals
b) Hotels
c) Bedrooms
d) All of these
Answer: d) All of these
a) Burn
b) Flicker
c) Turn ON or OFF
d) Melt
Answer: c) Turn ON or OFF
a) In series
b) Directly to earth
c) Independently
d) Through starter
Answer: c) Independently
a) Neutral
b) Earth
c) Phase
d) Any wire
Answer: c) Phase
a) Starter
b) Fan
c) Switchboard door
d) Bulb holder
Answer: a) Starter
a) All loads must share one switch
b) Fuse is added for safety
c) Bed switches increase voltage
d) Tube lights do not need a switch
Answer: b) Fuse is added for safety
This set of MCQs helps Work Education Class 9 students revise how bulbs and tube lights work, including their components, wiring, and energy efficiency. As part of the Work Education Class 9 Study Material 2025, these questions enable Class 9 learners to understand the practical functioning of common lighting devices used in homes and schools.
a) Light energy → electrical energy
b) Electrical energy → light energy
c) Heat energy → sound energy
d) Chemical energy → light
Answer: b) Electrical energy → light energy
a) CFL
b) LED
c) Incandescent lamp
d) HID lamp
Answer: c) Incandescent lamp
a) LED
b) CFL
c) Incandescent
d) Tube light
Answer: c) Incandescent
a) Halogen
b) CFL
c) Incandescent
d) LED
Answer: d) LED
a) Compact Filament Lamp
b) Compact Fluorescent Lamp
c) Current Flow Lamp
d) Commercial Fluorescent Light
Answer: b) Compact Fluorescent Lamp
a) Heating a filament
b) Gas discharge
c) Light emission from a semiconductor
d) Mercury vapor
Answer: c) Light emission from a semiconductor
a) Incandescent
b) Halogen
c) CFL
d) LED
Answer: d) LED
a) LED
b) CFL
c) Halogen
d) Incandescent
Answer: b) CFL
a) LED
b) CFL
c) Incandescent
d) Metal halide
Answer: c) Incandescent
a) LED
b) CFL
c) Incandescent lamps
d) Tube lights
Answer: c) Incandescent lamps
a) Nitrogen
b) Mercury vapor
c) Oxygen
d) Neon
Answer: b) Mercury vapor
a) Heat
b) White light
c) Sparks
d) Red light
Answer: b) White light
a) Diode
b) Starter
c) Fan regulator
d) Fuse
Answer: b) Starter
a) Filament
b) Switch
c) Choke/Ballast
d) Holder
Answer: c) Choke/Ballast
a) Light
b) Heat
c) Color
d) Current
Answer: b) Heat
a) Incandescent bulb
b) CFL
c) LED
d) Halogen bulb
Answer: c) LED
a) Small LED bulbs
b) HID lamps
c) Battery lamps
d) Toy bulbs
Answer: b) HID lamps
a) Heating filament
b) Gas discharge
c) Battery reaction
d) Reflection
Answer: b) Gas discharge
a) Light Emitting Device
b) Light Emitting Diode
c) Low Energy Diode
d) Light Energy Display
Answer: b) Light Emitting Diode
a) CFL
b) LED
c) Tube light
d) Fluorescent lamp
Answer: b) LED
a) CFL
b) LED
c) Halogen lamp
d) Incandescent
Answer: c) Halogen lamp
a) HID lamps
b) Tube lights
c) CFL and LED bulbs
d) Sodium lamps
Answer: c) CFL and LED bulbs
a) LED
b) CFL
c) Incandescent bulb
d) Tube light
Answer: c) Incandescent bulb
a) Very dim
b) Colored
c) Uniform white
d) Red
Answer: c) Uniform white
a) Bulb holder vibration
b) Starter operation
c) Loose wiring
d) Earth leakage
Answer: b) Starter operation
a) Small LED bulb
b) Tube light
c) Halogen light
d) CFL night lamp
Answer: b) Tube light
a) Glass
b) Filament
c) Gas
d) Electricity
Answer: b) Filament
a) CFL
b) Halogen floodlights
c) Tube lights
d) Incandescent bulbs
Answer: b) Halogen floodlights
a) More heat
b) More light with less current
c) Colored light
d) Sound
Answer: b) More light with less current
a) LEDs are the least efficient
b) Incandescent bulbs save maximum power
c) Tube lights use choke and starter
d) CFLs work without electricity
Answer: c) Tube lights use choke and starter
This set of MCQs helps Work Education Class 9 students revise the functions and uses of important electrical instruments such as testers, ammeters, voltmeters, and multimeters. As part of the Work Education Class 9 Study Material 2025, these questions support Class 9 learners in understanding how measurements are taken safely and accurately in electrical circuits.
a) Voltage
b) Resistance
c) Current
d) Power
Answer: c) Current
a) Electric current
b) Voltage
c) Heat
d) Frequency
Answer: b) Voltage
a) Only voltage
b) Only resistance
c) Only current
d) Voltage, current, resistance, etc.
Answer: d) Voltage, current, resistance, etc.
a) High
b) Low
c) Medium
d) Zero always
Answer: b) Low
a) Very low
b) Very high
c) No
d) Zero
Answer: b) Very high
a) In parallel
b) In series
c) At any point
d) Across the battery
Answer: b) In series
a) In series
b) In parallel
c) Inside the battery
d) Between two ammeters
Answer: b) In parallel
a) Nothing
b) It increases voltage
c) It may get damaged due to high current
d) It increases resistance
Answer: c) It may get damaged due to high current
a) Circuit will work normally
b) Current will stop due to high resistance
c) Voltage increases
d) Ammeter reading improves
Answer: b) Current will stop due to high resistance
a) Needles
b) Changing colors
c) Numbers
d) Beeps
Answer: c) Numbers
a) Display screen
b) Moving coil
c) Speaker
d) Sensor
Answer: b) Moving coil
a) Volt
b) Ohm
c) Ampere
d) Watt
Answer: c) Ampere
a) Ampere
b) Joule
c) Volt
d) Watt
Answer: c) Volt
a) Battery level
b) If a path/wire is complete
c) Voltage drop
d) Magnet strength
Answer: b) If a path/wire is complete
a) Analog multimeter
b) DMM (Digital Multimeter)
c) Rotary meter
d) Power meter
Answer: b) DMM (Digital Multimeter)
a) Power
b) Frequency
c) Voltage across the bulb
d) Resistance of wire
Answer: c) Voltage across the bulb
a) It is heavier
b) Gives very accurate readings
c) Uses more battery
d) Cannot measure resistance
Answer: b) Gives very accurate readings
a) Ammeter
b) Voltmeter
c) Ohmmeter
d) Resistor
Answer: c) Ohmmeter
(Note: Multimeter includes an ohmmeter function.)
a) Battery charge
b) Alternating voltage
c) Only DC current
d) Capacitance
Answer: b) Alternating voltage
a) Low
b) High
c) Equal to load resistance
d) Zero
Answer: b) High
a) Voltmeter
b) Ammeter
c) Ohmmeter
d) Power meter
Answer: b) Ammeter
a) Ammeter
b) Analog meter
c) Digital meter
d) Hydrometer
Answer: c) Digital meter
a) Current supplied
b) Voltage of battery
c) Resistance of battery
d) Heat produced
Answer: b) Voltage of battery
a) Current
b) Voltage
c) Resistance
d) Power
Answer: c) Resistance
a) Flashes
b) Beeps
c) Heats up
d) Stops working
Answer: b) Beeps
a) Change wire color
b) Select what you want to measure
c) Increase resistance
d) Start and stop the meter
Answer: b) Select what you want to measure
a) Voltmeter
b) Thermometer
c) Ammeter
d) Capacitor
Answer: c) Ammeter
a) Potential difference
b) Current inside wire
c) Heat produced
d) Magnetic field
Answer: a) Potential difference
a) Only ammeter
b) Only voltmeter
c) Many instruments in one
d) Only ohmmeter
Answer: c) Many instruments in one
a) Ammeter has high resistance
b) Voltmeter has low resistance
c) Multimeter cannot measure resistance
d) Ammeter is always connected in series
Answer: d) Ammeter is always connected in series
This set of MCQs helps Work Education Class 9 students revise basic electronic components such as resistors, capacitors, LEDs, diodes, and transistors. As part of the Work Education Class 9 Study Material 2025, these questions strengthen Class 9 learners’ understanding of how electronic parts function and are used in simple circuits and devices.
a) Magnetism
b) Resistance heating
c) Chemical reaction
d) Sound vibration
Answer: b) Resistance heating
a) Breaking circuits
b) Melting solder to join components
c) Measuring voltage
d) Cooling the PCB
Answer: b) Melting solder to join components
a) Gun type
b) Pencil type
c) Temperature-controlled iron
d) Hot air gun
Answer: b) Pencil type
a) Very slowly
b) Very quickly
c) Only at night
d) Only in AC circuits
Answer: b) Very quickly
a) Change wire color
b) Adjust heat level
c) Produce sound
d) Measure resistance
Answer: b) Adjust heat level
a) Plastic
b) Copper
c) Tin–lead alloy
d) Iron filings
Answer: c) Tin–lead alloy
a) Increase current
b) Store charge
c) Limit or control current
d) Produce sound
Answer: c) Limit or control current
a) Volt
b) Ampere
c) Ohm
d) Watt
Answer: c) Ohm
a) Burn circuits
b) Protect LEDs from high current
c) Produce heat
d) Store electricity
Answer: b) Protect LEDs from high current
a) Shape
b) Voltage
c) Resistance value
d) Current rating
Answer: c) Resistance value
a) Heat
b) Sound
c) Electrical charge
d) Magnetic force
Answer: c) Electrical charge
a) Filtering and smoothing
b) Producing sound
c) Reducing current
d) Generating heat
Answer: a) Filtering and smoothing
a) Ceramic capacitor
b) Electrolytic capacitor
c) Plastic capacitor
d) Variable capacitor
Answer: b) Electrolytic capacit
a) Increasing heat
b) Starting and running the motor
c) Storing light
d) Producing music
Answer: b) Starting and running the motor
a) Timing
b) Cleaning
c) Burning
d) Cooling
Answer: a) Timing
a) Light Energy Device
b) Light Emitting Diode
c) Low Energy Display
d) Light Electric Device
Answer: b) Light Emitting Diode
a) They are heated
b) Current flows in correct direction
c) They are shaken
d) Connected to neutral only
Answer: b) Current flows in correct direction
a) Capacitor
b) Motor
c) Resistor
d) Transformer
Answer: c) Resistor
a) Displays
b) Indicator lights
c) Streetlights
d) All of these
Answer: d) All of these
a) Very high
b) Very low
c) No
d) Unlimited
Answer: b) Very low
a) Resistor
b) Capacitor
c) LED
d) Solder
Answer: b) Capacitor
a) Light
b) Heat
c) Color
d) Electricity
Answer: b) Heat
a) Heating the lamp
b) Storing energy to release quickly
c) Creating sound
d) Reducing voltage
Answer: b) Storing energy to release quickly
a) Resistance
b) Voltage and current
c) Length of circuit
d) Battery life
Answer: b) Voltage and current
a) Two (anode and cathode)
b) Three
c) Four
d) Five
Answer: a) Two (anode and cathode)
a) LED
b) Resistor + Capacitor
c) Solder wire
d) Fuse
Answer: b) Resistor + Capacitor
a) Voltmeter
b) Soldering iron
c) Multimeter
d) Regulator
Answer: b) Soldering iron
a) LEGO base
b) PCB
c) Glass plate
d) Wooden frame
Answer: b) PCB
a) Smooth voltage
b) Increase noise
c) Heat wires
d) Short-circuit the load
Answer: a) Smooth voltage
a) Resistors store charge
b) LEDs glow without current
c) Capacitors store electric charge
d) Soldering irons produce electricity
Answer: c) Capacitors store electric charge
This MCQ set helps Work Education Class 9 students revise the working principles of diodes and transistors, including rectification, signal control, and amplification. Prepared as part of the Work Education Class 9 Study Material 2025, these questions enable Class 9 learners to understand how semiconductor devices function and how they are used in modern electronic circuits.
a) Both directions
b) No direction
c) One direction only
d) Two equal directions
Answer: c) One direction only
a) Forward bias
b) Reverse bias
c) No bias
d) Only in AC
Answer: a) Forward bias
a) Allows current
b) Blocks current
c) Glows
d) Amplifies current
Answer: b) Blocks current
a) A circle
b) A triangle and a line
c) A square
d) A zigzag
Answer: b) A triangle and a line
a) Cathode
b) Anode
c) Current
d) Voltage
Answer: b) Anode
a) Cathode
b) Anode
c) Battery
d) Load
Answer: a) Cathode
a) LED
b) Rectifier diode
c) Zener diode
d) Solar diode
Answer: b) Rectifier diode
a) Transistor
b) Capacitor
c) Diode
d) Resistor
Answer: c) Diode
a) It overheats
b) Current flows in forward direction
c) Voltage is reversed
d) It is cooled
Answer: b) Current flows in forward direction
a) Filtering
b) Switching and amplification
c) Glowing
d) Heating
Answer: b) Switching and amplification
a) One
b) Two
c) Three
d) Four
Answer: c) Three
a) Gate, Source, Drain
b) Positive, Negative, Neutral
c) Emitter, Base, Collector
d) Input, Output, Return
Answer: c) Emitter, Base, Collector
a) Anode, Cathode, Gate
b) Gate, Source, Drain
c) Base, Emitter, Collector
d) Positive, Negative, Ground
Answer: b) Gate, Source, Drain
a) Voltage
b) Current
c) Power
d) Heat
Answer: b) Current
a) Current
b) Voltage
c) Resistance
d) Temperature
Answer: b) Voltage
a) Holes
b) Electrons
c) Protons
d) None
Answer: b) Electrons
a) PNP
b) NPN
c) Silicon diode
d) LED
Answer: b) NPN
a) Motor
b) Amplifier
c) Heater
d) Transformer
Answer: b) Amplifier
a) Light, dark
b) Hot, cold
c) ON, OFF
d) Small, large
Answer: c) ON, OFF
a) Smaller
b) Larger
c) Equal
d) Zero
Answer: b) Larger
a) Copper
b) Silicon
c) Iron
d) Aluminium
Answer: b) Silicon
a) Increase power
b) Convert AC to DC
c) Produce sound
d) Store energy
Answer: b) Convert AC to DC
a) Amplification
b) Voltage regulation
c) Switching
d) Energy storage
Answer: b) Voltage regulation
a) Light bulbs
b) Logic gates
c) Speakers
d) Motors
Answer: b) Logic gates
a) Open circuit
b) Short circuit
c) Battery
d) Amplifier
Answer: a) Open circuit
a) Capacitor
b) Battery
c) Resistor
d) Fuse
Answer: c) Resistor
a) Increase sound signal strength
b) Produce light
c) Store charge
d) Reduce battery voltage
Answer: a) Increase sound signal strength
a) High-power
b) Low-noise and low-power
c) Mechanical
d) Heating
Answer: b) Low-noise and low-power
a) NPN
b) PNP
c) LED
d) FET
Answer: c) LED
a) Diodes allow both-way current
b) Transistors cannot amplify
c) Diodes block current in one direction
d) BJTs are voltage controlled
Answer: c) Diodes block current in one direction
This set of MCQs helps Work Education Class 9 students understand and apply Ohm’s Law, which explains the relationship between voltage, current, and resistance in a circuit. As part of the Work Education Class 9 Study Material 2025, these questions support Class 9 learners in calculating electrical values using the formula V=IRV = IRV=IR and applying it to real-life problem-solving.
a) Resistance
b) Power
c) Current
d) Temperature
Answer: c) Current
a) P = VI
b) V = IR
c) I = VR
d) R = PV
Answer: b) V = IR
a) Volt
b) Ampere
c) Ohm
d) Watt
Answer: c) Ohm
a) Volt
b) Ampere
c) Coulomb
d) Watt
Answer: b) Ampere
a) V
b) I
c) R
d) P
Answer: c) R
a) Increase
b) Decrease
c) Become zero
d) Remain constant
Answer: a) Increase
a) Increase
b) Decrease
c) Double
d) Stay the same
Answer: b) Decrease
a) Ammeter
b) Voltmeter
c) Ohmmeter
d) Wattmeter
Answer: b) Voltmete
a) Multimeter
b) Ammeter
c) Capacitor
d) Resistor
Answer: b) Ammeter
a) Pressure
b) Length
c) Temperature
d) Power
Answer: c) Temperature
a) 8 V
b) 2 V
c) 4 V
d) 6 V
Answer: a) 8 V
(Using V = IR → 2 × 4)
a) 36 Ω
b) 4 Ω
c) 9 Ω
d) 3 Ω
Answer: b) 4 Ω
(R = V/I → 12/3)
a) 1 A
b) 3 A
c) 2 A
d) 5 A
Answer: c) 2 A
(I = V/R → 10/5)
a) 5 Ω
b) 10 Ω
c) 15 Ω
d) 3 Ω
Answer: a) 5 Ω
a) More
b) Less
c) Zero
d) Infinite
Answer: b) Less
a) Lower
b) Higher
c) Equal
d) Negative
Answer: b) Higher
a) Double
b) Half
c) Zero
d) Same
Answer: b) Half
a) High
b) Very high
c) Low
d) Zero
Answer: c) Low
a) Very low
b) Medium
c) Very high
d) Zero
Answer: c) Very high
a) Resistors
b) LEDs
c) Metallic wire
d) Heating coil
Answer: b) LEDs
a) Curved line
b) Zigzag
c) Straight line
d) Circular
Answer: c) Straight line
a) Zero
b) Infinite (very large)
c) Negative
d) Constant
Answer: b) Infinite (theoretically)
a) Zero / infinite
b) Large / large
c) Positive / zero
d) Negative / low
Answer: a) Zero / infinite
a) Length of wire
b) Thickness of wire
c) Material of wire
d) All of these
Answer: d) All of these
a) Ohm
b) Ampere
c) Watt
d) Volt
Answer: d) Volt
a) 5 V
b) 10 V
c) 20 V
d) 50 V
Answer: a) 5 V
(V = IR → 10 × 0.5)
a) 1 Ω
b) 2 Ω
c) 3 Ω
d) 6 Ω
Answer: c) 3 Ω
a) Voltage
b) Current
c) Resistance
d) All of these
Answer: d) All of these
a) I = V × R
b) R = V/I
c) V = I/R
d) R = I × V
Answer: b) R = V/I
a) V is inversely proportional to I
b) V = IR
c) R changes with voltage
d) Ohm’s Law applies to all materials
Answer: b) V = IR
Work Education Class 9 Study Material 2025 is more than a classroom subject—it is a practical life skill that helps Class 9 students understand the electrical systems, tools, and technologies that surround them every day. By learning about safety devices, earthing, electromagnetism, motors, wiring, electronics, and Ohm’s Law, students build a strong foundation of both conceptual understanding and real-world application. These topics empower learners to think critically, act safely, and make informed decisions in practical situations, aligning perfectly with the competency-driven approach of NEP 2025.
As Class 9 students apply these concepts—such as identifying an MCB trip, using a tester safely, understanding wiring layouts, or troubleshooting simple electrical issues—they gain confidence and develop essential vocational abilities. These skills not only strengthen academic learning but also prepare them for future technical education and everyday problem-solving.
At a2zly.com, our aim is to support learners, teachers, and Kendriya Vidyalaya educators with clear, reliable, and NEP-aligned study materials that make every topic easier to understand and apply. With continued practice, curiosity, and hands-on learning, every student can transform these foundational concepts into lifelong skills.
Keep learning, stay safe, and continue exploring with a2zly.com — your trusted partner in smart education.
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