Cbse class 10th science Magnetic effects of electric current-test paper

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Here’s a comprehensive Class 10 Science Test Paper for Chapter 12: Magnetic Effects of Electric Current, based on the latest CBSE 2024-25 syllabus, previous year papers, NCERT, and sample papers. The test ensures a mix of conceptual, competency-based, and application-level questions.

Magnetic effects of electric current

Class 10 Science – Chapter 12: Magnetic Effects of Electric Current

Comprehensive Test Paper (2024-25)

Section A: In-Depth Conceptual Questions (3 Marks Each)

  1. Explain the principle, construction, and working of an electric motor with a labeled diagram. Also, mention two practical applications of electric motors.
  2. A current-carrying conductor is placed in a magnetic field. State the rule to determine the direction of force acting on it. How does the direction of force change when (i) current direction is reversed? (ii) magnetic field direction is reversed?
  3. Explain how a solenoid behaves like a bar magnet. What will happen if the direction of current in the solenoid is reversed? Give two applications of solenoids.

Section B: Competency-Based Questions (4 Marks Each)

  1. A student performs an experiment using a compass and a straight current-carrying wire. She observes that the needle of the compass deflects.
    • Explain why this happens.
    • What rule can be used to determine the direction of the magnetic field?
    • If the current in the wire is increased, what will be the effect on the deflection of the needle?
    • What will happen if the current is reversed?
  2. A student places a current-carrying coil near a bar magnet. The magnet starts moving.
    • Identify the phenomenon responsible for this motion.
    • Explain the rule that governs this interaction.
    • How can you increase the strength of this effect?
    • Name two practical applications of this effect.
  3. A commuter bus has a loudspeaker attached to it. A student standing nearby notices that every time the microphone is switched on, the compass needle deflects.
    • Explain why the needle deflects.
    • Identify the scientific principle behind it.
    • What will happen if the microphone is switched off?
    • How does this phenomenon help in daily life?

Section C: Previous Year Questions (3 Marks Each)

  1. (CBSE PYQ) State Fleming’s Left-Hand Rule. Name one device where it is used. A beam of electrons moving from left to right is deflected downward by a magnetic field. What is the direction of the magnetic field?
  2. (CBSE PYQ) What is electromagnetic induction? Explain how it works using Faraday’s experiment. Give two practical applications of this phenomenon.
  3. (CBSE PYQ) A circuit is set up using a coil and a galvanometer. A bar magnet is moved towards the coil, and the galvanometer shows a deflection. Explain why this happens. What happens if the magnet is moved away? What would be the observation if the magnet is held stationary?

Section D: NCERT-Based Questions (4 Marks Each)

  1. (NCERT) Describe the principle, construction, and working of an electric generator. Differentiate between an AC generator and a DC generator with a diagram.
  2. (NCERT) What is an electromagnet? How is it different from a permanent magnet? Give three advantages of using an electromagnet over a permanent magnet.

Section E: Sample Paper-Based Questions (4 Marks Each)

  1. (Sample Paper) An electric fuse is connected in a household circuit. Explain its working principle and why a fuse wire is always placed in series with an appliance.
  2. (Sample Paper) State the function of the following in a household circuit: (i) Earth wire, (ii) MCB (Miniature Circuit Breaker).
  3. (Sample Paper) Why do electric field lines never intersect? What will happen if two magnetic field lines intersect each other?

Section F: Case-Based Questions (5 Marks Each)

Case Study 1: Magnetic Effects in Daily Life

  1. A company has introduced an innovative electric car that runs on an electromagnetic propulsion system. The car uses electric motors to generate force, making it move efficiently without fuel combustion.
  • (a) Which principle of physics is being applied in this case?
  • (b) Explain the role of electric motors in this car.
  • (c) What type of current (AC/DC) would be most suitable for the electric motors and why?
  • (d) How can electromagnetic induction play a role in charging electric vehicles wirelessly?

Case Study 2: Application of Electromagnetic Induction

  1. In an amusement park, a new roller coaster is designed with magnetic brakes. The braking system works without direct contact between surfaces, making the ride safer and more efficient.
  • (a) Identify the scientific principle involved in this braking system.
  • (b) Explain how magnetic brakes work.
  • (c) What are the advantages of using magnetic brakes over traditional friction brakes?
  • (d) How does Lenz’s Law apply in this case?

Instructions for Students:

  • Total Marks: 50
  • All questions are compulsory.
  • Use diagrams wherever necessary.
  • Write clear and structured answers.

 

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