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class 12 physics Chapter 14: Electromagnetism MCQs With Explanations

Practice class 12 physics Chapter 14: Electromagnetism MCQs with explanations for Pakistani board exams. Includes solved objective questions, answer checking, chapter revision guidance and next chapter suggestions.

MCQs / class 12 / physics / Chapter 14: Electromagnetism
10 MCQs

Chapter 14: Electromagnetism Objective Preparation

Use this page for direct chapter practice, answer checking and explanation review. It is available through the clean URL shown in the browser, so students can bookmark and share this exact chapter.

10Total MCQs
10With explanations
1Topics represented

Topics found: Electromagnetic Induction

Electromagnetism MCQs With Explanations

Q1. Lenz's law conserves:
Lenz's law ensures that induced current opposes the change causing it, thereby conserving energy by preventing perpetual motion.
Q2. Transformer core is iron because:
Iron is used in transformer cores because it is a ferromagnetic material that efficiently channels magnetic flux, enhancing coupling between windings.
Q3. Device converting electrical to mechanical energy:
A DC motor converts electrical energy into mechanical rotational energy via electromagnetic forces acting on current-carrying coils.
Q4. Ideal transformer conserves:
An ideal transformer conserves energy by transferring power from primary to secondary without losses, though voltage and current change proportionally.
Q5. Energy stored in inductor:
The energy stored in an inductor is given by ½LI², where L is inductance and I is current.
Q6. Energy stored in 50 mH coil carrying 2 A is:
Using E = ½LI², with L = 0.05 H and I = 2 A, energy = ½ × 0.05 × 4 = 0.1 J.
Q7. Inductance is measured in:
Inductance is the property of a conductor that opposes changes in current, and its SI unit is the Henry, named after Joseph Henry.
Q8. In a choke:
A choke is designed to oppose AC with high inductance and low resistance to minimize power loss while blocking high-frequency currents.
Q9. The maximum induced emf in a rotating armature of an AC generator is:
The maximum emf is ε₀ = NωAB = 2πf NAB, where ω = 2πf; the option incorrectly includes N², but the correct form is NABω.
Q10. Self-inductance is given by:
Self-inductance L is defined as the flux linkage per unit current, L = NΦ/I.

After Chapter 14: Electromagnetism, Practice Next Chapters

Once you finish these MCQs, continue with the next available chapters from physics so your revision stays chapter-wise and complete.

Chapter 14: Electromagnetism Revision Guide

Complete the MCQs first, then review every incorrect answer against the textbook heading where that concept appears. For biology and other science subjects, pay attention to terminology, diagrams, sequence of processes, examples and differences between similar structures or functions.

This chapter page keeps the exact class, subject, chapter, question count, answer checking, explanations and follow-up chapters together, so students can revise from one focused URL instead of searching through the full book again.

class 12 Physics MCQ Preparation: Electromagnetism

This page supports Intermediate Part 2 practice in Physics. At this stage, the main purpose is consolidating advanced concepts while balancing board revision, college assessments and admission preparation. The questions available here should be used with the current textbook and the instructions issued by the learner's school or examination board.

What Physics MCQs can test

In Physics, objective questions commonly draw on definitions, physical quantities, SI units, laws, graphs, diagrams, formulas and the interpretation of numerical situations. A useful answer is based on the exact wording and concept, not simply on recognising a familiar option. For this subject, learners should write the known quantities and units before choosing a formula, and distinguish a law from the example used to demonstrate it.

Electromagnetism: what to focus on

Definitions, diagrams, measurable quantities, component behavior and relationships between changing physical conditions.

Label the relevant diagram or circuit and explain what changes, what remains constant and why before selecting an answer.

Common mistakes for class 12 learners

In this subject, frequent errors include mixing scalar and vector quantities, overlooking units, reversing cause and effect, or choosing a familiar formula without checking its conditions. Pay special attention to links between earlier intermediate concepts and the more advanced applications introduced in the final year. When the page marks an answer as incorrect, the next step should be to identify the mistaken idea and verify it, rather than memorising the displayed answer letter.

A practical revision routine

Use mixed recall and application questions, then revisit the chapters where formulas, processes or closely related terms are confused. Before attempting the MCQs, review definitions, symbols, unit conversions, graph shapes, diagram labels and the meaning of each term in a formula. Complete a manageable set without notes, check the result, and divide errors into missing knowledge, misunderstood concepts and careless reading. Revise the appropriate section before repeating the chapter.

How to review Electromagnetism after the quiz

List the questions you missed from Electromagnetism and write the textbook heading connected with each one. Explain the correct idea in your own words, then return later and answer a fresh set. This gives the chapter page a clear purpose: finding specific weaknesses in Physics rather than only collecting a score.

Accuracy and responsible use

Explanations are provided where they exist in the question bank, but educational databases can contain incomplete or mistaken material. Confirm disputed answers with an authoritative textbook or teacher. Ahmad Learning Hub provides a practice resource and does not claim that a question will appear in an examination or that every available item represents an official board question.