Classroom Question Quest
Welcome to the Magnetism Question quest for Class 10. Welcome, explorers of the electromagnetic world!
This is not just a question set: it’s a quest through the invisible forces that power our world: from the pulse of a robot’s arm to the maglev trains gliding silently above their tracks. Each case you encounter will test how deeply you understand the magnetic effects of current not just as theory, but as a living science shaping our future.
Think like innovators, reason like scientists, and read between the lines of each story. The goal isn’t only to answer correctly ;it’s to imagine why these effects matter in a world of machines, drones, and dreams of a smarter planet.
Use the comment section to share your reasoning, debate with your classmates, or suggest solutions in each scenario.
Let the questions begin and may your mind stay magnetically charged!
- In the ruins of a future factory city, ARX-23, a robot built to salvage metallic scraps, uses a massive electromagnet in its arm. To conserve dwindling energy, it adjusts the current based on the weight of the scrap. One day, the magnet fails to lift even light fragments, though the battery shows full charge. Technicians discover the coil has overheated from prolonged use.
What caused the failure in lifting?
A. The coil’s resistance increased, reducing the current and weakening the magnetic field.
B. The number of turns in the coil decreased, breaking the circuit.
C. The iron core became permanently magnetized.
D. The polarity of the battery reversed automatically.
2. In 2145, Neo-Delhi runs on magnetic levitation streets where cars hover above electromagnetic roads. However, during monsoon storms, some vehicles crash due to fluctuating lift forces. Engineers suspect a fault in the feedback circuits that regulate current.
What is the scientific reason behind the drop in lift?
A. Fluctuating current changed the strength of the magnetic field supporting the cars.
B. The direction of magnetic field reversed, canceling lift.
C. The electromagnets became superconductors in rain.
D. Water acted as a magnetic insulator.
3. Surveillance drones use tiny solenoids in stabilizers to control rotor tilt through magnetic torque. During a power surge, a fleet of drones suddenly spins uncontrollably and crashes.
Which principle explains this malfunction?
A. Sudden increase in current increased the magnetic field, producing excess torque.
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B. The current became steady, eliminating induced emf.
C. The solenoid’s magnetic field reversed direction spontaneously.
D. Magnetic field lines became circular around the propellers.
4. In an underground school where power is scarce, a single AI-powered electric bell announces learning sessions. Its sound weakens over time. The AI reports: “Electromagnetic fatigue detected.”
What physical change best matches this statement?
A. The coil’s current decreases due to battery drain, reducing magnet strength.
B. The armature becomes permanently magnetized.
C. The soft iron core melts due to heating.
D. The magnetic field lines disappear permanently.
5. A robotic gatekeeper uses an electromagnet to lock doors protecting survivors from acid storms. The moment lightning strikes nearby, the gate opens unexpectedly, releasing toxic fumes inside.
Which principle explains this failure?
A. Induced current from the nearby lightning interfered with the electromagnet’s current.
B. The lightning reversed the polarity of the gate’s permanent magnet.
C. The door material became diamagnetic during the strike.
D. The circuit switched to DC mode automatically.
6. Beneath the Earth’s crust, a maglev train connects human colonies. Engineers notice that the faster the train moves, the stronger the current in its coils becomes, powering the lights automatically.
Which phenomenon is responsible?
A. Electromagnetic induction due to changing magnetic flux with speed.
B. Conversion of electric energy into mechanical energy.
C. Resistance heating of the train’s coils.
D. Magnetic field saturation of the solenoid.
7. A future Earth builds an artificial magnetic field to deflect solar radiation. Scientists realize the field collapses whenever the current stops flowing through the coils.
Which statement explains why?
A. The field exists only while current flows in the coil.
B. The coil material becomes non-magnetic permanently.
C. Magnetic field lines remain trapped in space.
D. The artificial field converts to electric charge.
Comments are welcome. You can discuss in this open forum.
