1️⃣ What happens when an electric current is passed through a conductor? 🔌
- A. It becomes charged
- B. It produces light
- C. It produces heat
- D. It produces a magnetic field
Show Answer 🔽
✅ D. It produces a magnetic field
2️⃣ The magnetic field around a straight current-carrying conductor is: 🔄
- A. Linear
- B. Circular
- C. Elliptical
- D. Irregular
Show Answer 🔽
✅ B. Circular
3️⃣ Who discovered the magnetic effect of electric current? 🧠
- A. Maxwell
- B. Faraday
- C. Oersted
- D. Ampere
Show Answer 🔽
✅ C. Oersted
4️⃣ The direction of magnetic field lines is taken from: 🧲
- A. South to North
- B. North to South
- C. Center outward
- D. Random
Show Answer 🔽
✅ B. North to South
5️⃣ The strength of magnetic field due to a straight conductor: 📈
- A. Increases with distance
- B. Decreases with distance
- C. Is zero
- D. Remains constant
Show Answer 🔽
✅ B. Decreases with distance
6️⃣ A magnetic field is produced by: ⚡
- A. A moving charge
- B. A stationary charge
- C. Both
- D. None
Show Answer 🔽
✅ A. A moving charge
7️⃣ Which rule gives the direction of magnetic field around a conductor? 🔃
- A. Left-hand rule
- B. Fleming’s right-hand rule
- C. Right-hand thumb rule
- D. Maxwell’s rule
Show Answer 🔽
✅ C. Right-hand thumb rule
8️⃣ Magnetic field lines inside a solenoid are: 📦
- A. Circular
- B. Parallel and uniform
- C. Divergent
- D. Random
Show Answer 🔽
✅ B. Parallel and uniform
9️⃣ Which of the following is used to detect current and magnetic field direction? 🧭
- A. Galvanometer
- B. Ammeter
- C. Magnetic compass
- D. Voltmeter
Show Answer 🔽
✅ C. Magnetic compass
🔟 A solenoid behaves like: 🧲
- A. A bar magnet
- B. A resistor
- C. A conductor
- D. A battery
Show Answer 🔽
✅ A. A bar magnet
1️⃣1️⃣ The magnetic field inside a current-carrying solenoid is: 🧲
- A. Zero
- B. Weak
- C. Strong and uniform
- D. Irregular
Show Answer 🔽
✅ C. Strong and uniform
1️⃣2️⃣ The magnetic field outside a solenoid is: 🔄
- A. Circular
- B. Uniform
- C. Very strong
- D. Weak and spread out
Show Answer 🔽
✅ D. Weak and spread out
1️⃣3️⃣ The polarity of an electromagnet can be reversed by: 🔁
- A. Changing the number of turns
- B. Changing the current direction
- C. Increasing voltage
- D. Using thicker wire
Show Answer 🔽
✅ B. Changing the current direction
1️⃣4️⃣ Magnetic field strength depends on: 📏
- A. Current strength
- B. Distance from conductor
- C. Number of turns in coil
- D. All of these
Show Answer 🔽
✅ D. All of these
1️⃣5️⃣ A current-carrying conductor produces: ⚡
- A. Electric field
- B. Sound
- C. Magnetic field
- D. None
Show Answer 🔽
✅ C. Magnetic field
1️⃣6️⃣ The magnetic field is strongest: 💪
- A. At the center of solenoid
- B. Near the wire
- C. At the poles of a magnet
- D. Far from the coil
Show Answer 🔽
✅ A. At the center of solenoid
1️⃣7️⃣ Which device uses the motor principle? ⚙️
- A. Transformer
- B. Loudspeaker
- C. Galvanometer
- D. Electric bell
Show Answer 🔽
✅ B. Loudspeaker
1️⃣8️⃣ The direction of force in a motor is given by: 🧭
- A. Right-hand thumb rule
- B. Fleming’s left-hand rule
- C. Fleming’s right-hand rule
- D. Ampere’s law
Show Answer 🔽
✅ B. Fleming’s left-hand rule
1️⃣9️⃣ What is the function of a commutator in a motor? 🔁
- A. Increases voltage
- B. Reverses direction of current
- C. Increases resistance
- D. Reduces heat
Show Answer 🔽
✅ B. Reverses direction of current
2️⃣0️⃣ Which rule helps determine magnetic field direction around a wire? 📐
- A. Right-hand thumb rule
- B. Left-hand rule
- C. Lenz’s law
- D. Newton’s rule
Show Answer 🔽
✅ A. Right-hand thumb rule
2️⃣1️⃣ A magnetic field exerts force on: 🧲
- A. Static charge
- B. Moving charge
- C. Neutral objects
- D. Insulators
Show Answer 🔽
✅ B. Moving charge
2️⃣2️⃣ What is the function of brushes in a motor? 🖌️
- A. Convert AC to DC
- B. Reverse direction
- C. Maintain contact with the commutator
- D. Produce magnetic field
Show Answer 🔽
✅ C. Maintain contact with the commutator
2️⃣3️⃣ What is the shape of magnetic field lines around a bar magnet? 🧲
- A. Straight lines
- B. Random
- C. Curved loops
- D. Horizontal
Show Answer 🔽
✅ C. Curved loops
2️⃣4️⃣ What happens to the field if current is doubled? 📈
- A. Doubled
- B. Halved
- C. Remains same
- D. Becomes zero
Show Answer 🔽
✅ A. Doubled
2️⃣5️⃣ Which device converts electrical energy into mechanical energy? ⚙️
- A. Generator
- B. Transformer
- C. Electric Motor
- D. Battery
Show Answer 🔽
✅ C. Electric Motor
2️⃣6️⃣ What causes a current-carrying conductor to experience force in a magnetic field? ⚡🧲
- A. Magnetic field is zero
- B. Interaction between magnetic field and current
- C. Electric field created
- D. None of these
Show Answer 🔽
✅ B. Interaction between magnetic field and current
2️⃣7️⃣ The direction of induced current is given by: 🔃
- A. Fleming’s left-hand rule
- B. Right-hand thumb rule
- C. Fleming’s right-hand rule
- D. Ampere’s rule
Show Answer 🔽
✅ C. Fleming’s right-hand rule
2️⃣8️⃣ In electromagnetic induction, what causes current to be induced? 🔄
- A. Static magnetic field
- B. Heating wire
- C. Changing magnetic field
- D. Stationary magnet
Show Answer 🔽
✅ C. Changing magnetic field
2️⃣9️⃣ In a generator, mechanical energy is converted into: ⚙️➡️⚡
- A. Chemical energy
- B. Magnetic energy
- C. Electrical energy
- D. Sound energy
Show Answer 🔽
✅ C. Electrical energy
3️⃣0️⃣ A generator works on the principle of: 🔄
- A. Motor effect
- B. Static induction
- C. Electromagnetic induction
- D. Magnetic repulsion
Show Answer 🔽
✅ C. Electromagnetic induction
3️⃣1️⃣ Electromagnetic induction was discovered by: 🧠
- A. Oersted
- B. Faraday
- C. Maxwell
- D. Fleming
Show Answer 🔽
✅ B. Faraday
3️⃣2️⃣ In a generator, what rotates to produce electricity? 🔄
- A. Armature
- B. Coil
- C. Brushes
- D. Magnet
Show Answer 🔽
✅ A. Armature
3️⃣3️⃣ Direction of induced current changes with: 🔁
- A. Type of wire
- B. Strength of current
- C. Direction of motion or magnetic field
- D. Temperature
Show Answer 🔽
✅ C. Direction of motion or magnetic field
3️⃣4️⃣ The device that converts mechanical energy into electrical energy is: ⚙️⚡
- A. Electric Motor
- B. Galvanometer
- C. Generator
- D. Transformer
Show Answer 🔽
✅ C. Generator
3️⃣5️⃣ Which of the following works on electromagnetic induction? 🌀
- A. Heater
- B. Bulb
- C. Electric motor
- D. Electric generator
Show Answer 🔽
✅ D. Electric generator
3️⃣6️⃣ Magnetic field lines never intersect because: 🔁
- A. They are imaginary
- B. They represent different forces
- C. Direction of field would be undefined at intersection
- D. They are repelled
Show Answer 🔽
✅ C. Direction of field would be undefined at intersection
3️⃣7️⃣ In electromagnetic induction, current can be induced in a coil by: 🔄
- A. Moving coil in magnetic field
- B. Changing magnetic field around coil
- C. Moving magnet toward or away from coil
- D. All of the above
Show Answer 🔽
✅ D. All of the above
3️⃣8️⃣ Electric motor converts: 🔄
- A. Electrical to chemical energy
- B. Chemical to mechanical energy
- C. Electrical to mechanical energy
- D. Mechanical to electrical energy
Show Answer 🔽
✅ C. Electrical to mechanical energy
3️⃣9️⃣ Which component is not a part of an electric motor? ⚙️
- A. Commutator
- B. Magnet
- C. Brushes
- D. Transformer
Show Answer 🔽
✅ D. Transformer
4️⃣0️⃣ A galvanometer shows deflection when: 🧭
- A. Battery is connected
- B. Circuit is broken
- C. Coil is rotated in magnetic field
- D. Switch is off
Show Answer 🔽
✅ C. Coil is rotated in magnetic field
4️⃣1️⃣ A magnetic field is produced around a wire only when: 🔌
- A. Wire is heated
- B. Current flows through it
- C. It is bent
- D. Voltage is applied
Show Answer 🔽
✅ B. Current flows through it
4️⃣2️⃣ Fleming’s right-hand rule is used to find: 🤚
- A. Direction of magnetic field
- B. Direction of induced current
- C. Direction of force
- D. Direction of voltage
Show Answer 🔽
✅ B. Direction of induced current
4️⃣3️⃣ Which of the following does NOT affect electromagnetic induction? ❌
- A. Speed of motion
- B. Strength of magnetic field
- C. Resistance of the coil
- D. Color of the wire
Show Answer 🔽
✅ D. Color of the wire
4️⃣4️⃣ An electric bell uses: 🔔
- A. Heating effect of current
- B. Magnetic effect of current
- C. Chemical effect of current
- D. Sound effect
Show Answer 🔽
✅ B. Magnetic effect of current
4️⃣5️⃣ In the motor principle, force is exerted when: 🧲⚡
- A. Electric field is applied
- B. Current flows in magnetic field
- C. Heat is supplied
- D. Vibration is applied
Show Answer 🔽
✅ B. Current flows in magnetic field
4️⃣6️⃣ Which direction does current flow in a generator’s external circuit? 🔁
- A. Always clockwise
- B. Always anti-clockwise
- C. Alternates
- D. None
Show Answer 🔽
✅ C. Alternates
4️⃣7️⃣ Which of the following can make an electromagnet stronger? 💪
- A. Reduce current
- B. Use wooden core
- C. Use soft iron core
- D. Decrease coil turns
Show Answer 🔽
✅ C. Use soft iron core
4️⃣8️⃣ Which type of magnet is temporary? ⏳
- A. Natural magnet
- B. Artificial permanent magnet
- C. Electromagnet
- D. None of the above
Show Answer 🔽
✅ C. Electromagnet
4️⃣9️⃣ Soft iron is used in electromagnets because: 🧲
- A. It is cheap
- B. It is a conductor
- C. It loses magnetism quickly
- D. It doesn’t rust
Show Answer 🔽
✅ C. It loses magnetism quickly
5️⃣0️⃣ Which of these is a practical use of electromagnetism? 🧪
- A. MRI machines
- B. Fans
- C. Thermometers
- D. Sprinklers
Show Answer 🔽
✅ A. MRI machines
5️⃣1️⃣ What happens if you move a magnet into a coil connected to a galvanometer? 🧲
- A. Needle stays still
- B. Needle deflects
- C. Needle breaks
- D. No effect
Show Answer 🔽
✅ B. Needle deflects
5️⃣2️⃣ Fleming’s right-hand rule is used for: 🤚
- A. Electric motor
- B. Electromagnet
- C. Electric generator
- D. Transformer
Show Answer 🔽
✅ C. Electric generator
5️⃣3️⃣ What happens when the coil in a generator is rotated faster? 🔁
- A. Less current is induced
- B. No current is induced
- C. More current is induced
- D. Direction of current reverses
Show Answer 🔽
✅ C. More current is induced
5️⃣4️⃣ In an AC generator, the current: 🔄
- A. Flows in one direction
- B. Changes direction periodically
- C. Is zero
- D. Is very low
Show Answer 🔽
✅ B. Changes direction periodically
5️⃣5️⃣ AC stands for: 🔁
- A. Absolute Current
- B. Active Current
- C. Alternating Current
- D. Added Current
Show Answer 🔽
✅ C. Alternating Current
5️⃣6️⃣ Which appliance uses electromagnetism? 💡
- A. Electric iron
- B. CFL bulb
- C. Electric bell
- D. Torch
Show Answer 🔽
✅ C. Electric bell
5️⃣7️⃣ The frequency of AC in India is: 🔄
- A. 50 Hz
- B. 60 Hz
- C. 100 Hz
- D. 30 Hz
Show Answer 🔽
✅ A. 50 Hz
5️⃣8️⃣ DC is supplied by: 🔋
- A. Generator
- B. Battery
- C. Power station
- D. Transformer
Show Answer 🔽
✅ B. Battery
5️⃣9️⃣ A galvanometer can detect: 🧭
- A. Voltage
- B. Resistance
- C. Current
- D. Magnetic force
Show Answer 🔽
✅ C. Current
6️⃣0️⃣ In an electric motor, commutator helps to: 🔁
- A. Produce AC
- B. Reverse current direction
- C. Reduce friction
- D. Control voltage
Show Answer 🔽
✅ B. Reverse current direction
6️⃣1️⃣ Direction of magnetic field around a conductor is found using: 👉
- A. Fleming’s left-hand rule
- B. Right-hand thumb rule
- C. Lenz’s law
- D. Ohm’s law
Show Answer 🔽
✅ B. Right-hand thumb rule
6️⃣2️⃣ What does Lenz’s Law deal with? 🔄
- A. Direction of induced current
- B. Resistance
- C. Voltage drop
- D. Heating effect
Show Answer 🔽
✅ A. Direction of induced current
6️⃣3️⃣ The magnetic field due to a straight wire is: ➿
- A. Elliptical
- B. Radial
- C. Circular
- D. Linear
Show Answer 🔽
✅ C. Circular
6️⃣4️⃣ Magnetic field strength around a wire is proportional to: 📈
- A. Length of wire
- B. Square of distance
- C. Current
- D. Thickness of wire
Show Answer 🔽
✅ C. Current
6️⃣5️⃣ Which of these produces the strongest magnetic field? 💪
- A. Straight wire
- B. Loop of wire
- C. Solenoid
- D. Battery
Show Answer 🔽
✅ C. Solenoid
6️⃣6️⃣ What is used to concentrate magnetic field in an electromagnet? 🧲
- A. Copper core
- B. Aluminum rod
- C. Soft iron core
- D. Steel rod
Show Answer 🔽
✅ C. Soft iron core
6️⃣7️⃣ A split ring in an electric motor acts as a: 🔁
- A. Transformer
- B. Commutator
- C. Brush
- D. Rotor
Show Answer 🔽
✅ B. Commutator
6️⃣8️⃣ What is induced when a magnetic field changes around a conductor? ⚡
- A. Heat
- B. Electric current
- C. Light
- D. Sound
Show Answer 🔽
✅ B. Electric current
6️⃣9️⃣ Which law explains conservation of energy in electromagnetic induction? ♻️
- A. Ohm’s Law
- B. Ampere’s Law
- C. Lenz’s Law
- D. Faraday’s First Law
Show Answer 🔽
✅ C. Lenz’s Law
7️⃣0️⃣ Which part of the generator connects the coil to the external circuit? 🔗
- A. Commutator
- B. Slip rings
- C. Brushes
- D. Armature
Show Answer 🔽
✅ B. Slip rings
7️⃣1️⃣ The magnetic field inside a solenoid is similar to that of a: 🧲
- A. Bar magnet
- B. Circular coil
- C. Straight wire
- D. Transformer
Show Answer 🔽
✅ A. Bar magnet
7️⃣2️⃣ A generator that produces DC uses: 🔁
- A. Split rings
- B. Slip rings
- C. Transformer
- D. Commutator
Show Answer 🔽
✅ A. Split rings
7️⃣3️⃣ Magnetic field lines are: 📶
- A. Open curves
- B. Closed loops
- C. Straight lines
- D. Wavy lines
Show Answer 🔽
✅ B. Closed loops
7️⃣4️⃣ When a coil is rotated in a magnetic field, the induced current is due to: 🔄
- A. Heating effect
- B. Chemical effect
- C. Electromagnetic induction
- D. Static electricity
Show Answer 🔽
✅ C. Electromagnetic induction
7️⃣5️⃣ Which of these follows Fleming’s Left-Hand Rule? 🤚
- A. Electric motor
- B. Generator
- C. Transformer
- D. Battery
Show Answer 🔽
✅ A. Electric motor
7️⃣6️⃣ Generator works on the principle of: 🔄⚡
- A. Heating effect
- B. Electrolysis
- C. Electromagnetic induction
- D. Conduction
Show Answer 🔽
✅ C. Electromagnetic induction
7️⃣7️⃣ Soft iron is preferred in electromagnets because: 🧲
- A. It becomes strongly magnetic
- B. It is easily available
- C. It rusts easily
- D. It is costly
Show Answer 🔽
✅ A. It becomes strongly magnetic
7️⃣8️⃣ A solenoid is: 🔄
- A. Rectangular loop
- B. Circular wire
- C. Coil of many circular turns
- D. Bar magnet
Show Answer 🔽
✅ C. Coil of many circular turns
7️⃣9️⃣ In electromagnetic induction, the current is: ⚡
- A. Supplied from outside
- B. Induced within the circuit
- C. Absent
- D. Always constant
Show Answer 🔽
✅ B. Induced within the circuit
8️⃣0️⃣ Electric motors are used in: ⚙️
- A. Fans
- B. Mixers
- C. Washing machines
- D. All of these
Show Answer 🔽
✅ D. All of these
8️⃣1️⃣ What type of current is used in homes? 🏠
- A. Direct current
- B. Static current
- C. Alternating current
- D. Pulsed current
Show Answer 🔽
✅ C. Alternating current
8️⃣2️⃣ Slip rings in a generator are used to: 🔗
- A. Reverse current
- B. Maintain contact with the rotating coil
- C. Reduce resistance
- D. Create magnetic field
Show Answer 🔽
✅ B. Maintain contact with the rotating coil
8️⃣3️⃣ The part of the motor that rotates is called: 🔄
- A. Commutator
- B. Rotor
- C. Stator
- D. Brushes
Show Answer 🔽
✅ B. Rotor
8️⃣4️⃣ Which factor increases magnetic field in a solenoid? ➕
- A. Reducing number of turns
- B. Using plastic core
- C. Increasing current
- D. Using thinner wire
Show Answer 🔽
✅ C. Increasing current
8️⃣5️⃣ Magnetic field strength is ________ to distance from wire. 📏
- A. Directly proportional
- B. Equal
- C. Inversely proportional
- D. Independent
Show Answer 🔽
✅ C. Inversely proportional
8️⃣6️⃣ What changes direction in an AC motor? 🔁
- A. Magnetic field
- B. Commutator
- C. Current
- D. Coil
Show Answer 🔽
✅ C. Current
8️⃣7️⃣ Right-hand thumb rule relates magnetic field with: 👉
- A. Resistance
- B. Force
- C. Direction of current
- D. Heat
Show Answer 🔽
✅ C. Direction of current
8️⃣8️⃣ Electromagnetic induction depends on: 🎯
- A. Shape of coil
- B. Distance of wire
- C. Change in magnetic field
- D. Resistance
Show Answer 🔽
✅ C. Change in magnetic field
8️⃣9️⃣ Generator produces electric current by: ⚡
- A. Static friction
- B. Magnetic induction
- C. Electric heating
- D. Static charge
Show Answer 🔽
✅ B. Magnetic induction
9️⃣0️⃣ Electric bell works on: 🔔
- A. Heating effect
- B. Magnetic effect
- C. Sound effect
- D. None
Show Answer 🔽
✅ B. Magnetic effect
9️⃣1️⃣ The function of brushes in motors is to: 🖌️
- A. Store current
- B. Switch power on/off
- C. Maintain contact with commutator
- D. None
Show Answer 🔽
✅ C. Maintain contact with commutator
9️⃣2️⃣ Which law gives the direction of induced current? ↪️
- A. Lenz’s Law
- B. Ohm’s Law
- C. Newton’s Law
- D. Faraday’s Law
Show Answer 🔽
✅ A. Lenz’s Law
9️⃣3️⃣ Direction of force on conductor is given by: 👉
- A. Fleming’s right-hand rule
- B. Fleming’s left-hand rule
- C. Ohm’s law
- D. Ampere’s law
Show Answer 🔽
✅ B. Fleming’s left-hand rule
9️⃣4️⃣ Magnetic field of a solenoid can be increased by: ➕
- A. Using copper core
- B. Decreasing coil turns
- C. Using iron core
- D. Reducing voltage
Show Answer 🔽
✅ C. Using iron core
9️⃣5️⃣ In AC, electrons: 🔄
- A. Flow one direction only
- B. Remain stationary
- C. Change direction periodically
- D. Flow randomly
Show Answer 🔽
✅ C. Change direction periodically
9️⃣6️⃣ In DC generator, commutator is used to: 🔁
- A. Make current stronger
- B. Keep current one-directional
- C. Produce magnetic field
- D. Reduce speed
Show Answer 🔽
✅ B. Keep current one-directional
9️⃣7️⃣ A device that uses electromagnetic induction is: 🌀
- A. Heater
- B. Transformer
- C. Battery
- D. LED
Show Answer 🔽
✅ B. Transformer
9️⃣8️⃣ The shape of magnetic field lines due to a solenoid is: 🔄
- A. Circular
- B. Random
- C. Similar to bar magnet
- D. Spiral
Show Answer 🔽
✅ C. Similar to bar magnet
9️⃣9️⃣ Which part of motor reverses current direction? 🔄
- A. Brushes
- B. Commutator
- C. Coil
- D. Magnet
Show Answer 🔽
✅ B. Commutator
1️⃣0️⃣0️⃣ Electric generators produce: ⚡
- A. Mechanical energy
- B. Magnetic energy
- C. Electrical energy
- D. Light energy
Show Answer 🔽
✅ C. Electrical energy