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class 12 physics Chapter 13: Current Electricity MCQs With Explanations

Practice class 12 physics Chapter 13: Current Electricity 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 13: Current Electricity
10 MCQs

Chapter 13: Current Electricity 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: Electromagnetism

Current Electricity MCQs With Explanations

Q1. Energy density of magnetic field in an inductor is:
The energy density of a magnetic field in vacuum is given by u = B²/(2μ₀), derived from magnetic field energy per unit volume.
Q2. The power loss in transformer is due to:
Eddy currents and hysteresis are the two primary sources of energy loss in transformer cores.
Q3. Maximum value of induced emf in the coil of AC generator is:
The maximum induced emf in an AC generator is ε₀ = NωAB, derived from Faraday’s law for rotating coil in magnetic field.
Q4. Which is the correct relation for an ideal transformer?
For an ideal transformer, voltage ratio equals turns ratio, and current ratio is inverse, so Nₛ/Nₚ = Iₚ/Iₛ.
Q5. The frequency of AC in Pakistan is:
Pakistan uses a standard AC frequency of 50 Hz, consistent with most of Europe and Asia.
Q6. One henry is equal to:
Henry is the unit of inductance, and since V = L(dI/dt), rearranging gives L = V·s/A, so 1 H = 1 V·s·A⁻¹.
Q7. The ratio of average induced emf to rate of change of current in a coil is called:
Self inductance is defined as the ratio of induced emf to the rate of change of current in the same coil, given by L = -ε/(dI/dt).
Q8. An inductor may store energy in its:
Inductors store energy in the magnetic field created by current flowing through their coils.
Q9. Which converts mechanical energy into electrical energy?
An AC generator uses mechanical rotation to induce alternating current via electromagnetic induction, converting mechanical to electrical energy.
Q10. Lenz's law is actually the law of conservation of:
Lenz's law ensures induced current opposes the change causing it, conserving energy by preventing perpetual motion.

After Chapter 13: Current Electricity, 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 13: Current Electricity 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: Current Electricity

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.

Current Electricity: 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 Current Electricity after the quiz

List the questions you missed from Current Electricity 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.