MCQs on Class 10 Science Magnetic Effect of Electric Current
FAQs on CBSE Chapter 13 Magnetic Effect of Electric Current Class 10 MCQ
1. What types of MCQs are considered important from Chapter 13, Magnetic Effect of Electric Current, for the CBSE Class 10 board exams 2025-26?
For the Class 10 board exams, you should focus on three main types of MCQs from this chapter:
- Stand-alone MCQs: These are direct questions testing definitions and principles, such as the SI unit of a magnetic field (Tesla) or the device that converts electrical energy to mechanical energy (Electric Motor).
- Assertion-Reason MCQs: These test your conceptual clarity. For example, an assertion might state that a compass needle deflects near a current-carrying wire, and the reason might explain that electric current produces a magnetic field.
- Case-Based/Source-Based MCQs: You will be given a paragraph describing a scenario, like an electric motor setup, followed by 4-5 MCQs based on the information and related concepts.
2. Which topics in Magnetic Effect of Electric Current carry the most weightage for 1-mark questions in the Class 10 Science exam?
Based on CBSE trends, the following topics are frequently tested in 1-mark MCQs:
- Properties of Magnetic Field Lines: Questions about their direction (North to South outside the magnet), non-intersection, and density.
- Right-Hand Thumb Rule: Determining the direction of the magnetic field around a straight or circular conductor.
- Solenoid: Properties of the magnetic field inside a solenoid (uniform and parallel).
- Force on a Current-Carrying Conductor: The principle behind the electric motor.
- Electromagnetic Induction: The phenomenon of inducing current, which is the principle behind the electric generator.
3. How can Fleming's Left-Hand and Right-Hand Rules be distinguished in application-based MCQs?
This is a common point of confusion. The key is to identify the function being described:
- Use Fleming's Left-Hand Rule when you need to find the direction of Force or Motion on a conductor when the magnetic field and current directions are known. Think of it as the motor rule.
- Use Fleming's Right-Hand Rule when you need to find the direction of Induced Current when the direction of motion and the magnetic field are known. This is the generator rule.
In an MCQ, if the question is about an electric motor or force, apply the left-hand rule. If it's about an electric generator or induced current, apply the right-hand rule.
4. Why are questions on electromagnets and solenoids frequently asked as MCQs in board exams?
Questions on electromagnets and solenoids are important because they test the core concept of the chapter: the relationship between electricity and magnetism. These MCQs effectively assess a student's understanding of:
- How a magnetic field is created using electric current.
- The factors affecting the strength of an electromagnet (number of turns, current, and soft iron core).
- The properties of the magnetic field produced by a solenoid, which acts like a bar magnet.
- Their practical applications in devices like electric bells, relays, and cranes, making them relevant for application-based questions.
5. What is a key strategy for solving assertion-reason MCQs related to electromagnetic induction in the 2025-26 CBSE exam?
A reliable strategy is to follow a two-step process:
- First, read the Assertion (A) and Reason (R) statements independently and determine if each one is true or false on its own.
- If both are true, then evaluate the final, crucial step: Does the Reason (R) provide the correct scientific explanation for the Assertion (A)?
For electromagnetic induction, a common trap is having two true but unrelated statements. For instance, the assertion might be about generating induced current, and the reason might state a property of magnetic fields. Both are true, but the reason doesn't explain the assertion.
6. Can a magnetic field change the kinetic energy of a moving charge? Why is this a common misconception tested in MCQs?
No, a magnetic field cannot change the kinetic energy of a moving charge. This is a classic conceptual trap. The magnetic force on a charged particle is always perpendicular to its direction of motion (velocity). A perpendicular force can only change the direction of the particle, not its speed. Since kinetic energy is calculated as ½mv², and the speed (v) does not change, the kinetic energy remains constant. MCQs often test this to differentiate students who have a deep understanding of work and energy from those with only surface-level knowledge.
7. What are some important concepts to master for MCQs on domestic electric circuits?
For the topic of domestic electric circuits, focus on these key concepts for MCQs:
- Wire Colour Coding: Knowing the standard colours for live (red), neutral (black), and earth (green) wires in India.
- Function of a Fuse: Its principle (Joule's law of heating), material (low melting point alloy), and placement (always in series with the live wire).
- Earthing: Its purpose is to provide a safety path for current to flow to the earth in case of a short circuit, preventing electric shock.
- AC vs DC: The advantage of Alternating Current (AC) for long-distance transmission and the standard frequency of AC in India (50 Hz).
