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class 12 physics Chapter 16: Alternating Current MCQs With Explanations

Practice class 12 physics Chapter 16: Alternating Current 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 16: Alternating Current
9 MCQs

Chapter 16: Alternating Current 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.

9Total MCQs
9With explanations
1Topics represented

Topics found: Physics of Solids

Alternating Current MCQs With Explanations

Q1. Conductivity of conductor (Ωm)⁻¹:
Metals like copper and silver have conductivities around 10⁷ (Ω·m)⁻¹ due to high density of free electrons.
Q2. Partially filled conduction band:
Conductors have partially filled conduction bands, allowing free movement of electrons even at low temperatures.
Q3. Stress/strain = ?
Elastic modulus (Young’s modulus) is defined as the ratio of stress to strain within the elastic limit of a material.
Q4. Ferromagnetic to paramagnetic temperature:
The Curie temperature is the threshold above which ferromagnetic materials lose their spontaneous magnetization and become paramagnetic.
Q5. Semiconductor behaves as insulator at:
At 0 K, thermal energy is zero, so no electrons are excited to the conduction band, leaving the semiconductor with no free charge carriers.
Q6. Most stable for permanent magnet:
Steel has high coercivity and retentivity, making it ideal for permanent magnets, unlike soft iron which loses magnetism easily.
Q7. SI unit of strain:
Strain is the ratio of change in length to original length, making it a dimensionless quantity with no unit.
Q8. At Curie temperature, iron becomes:
Above the Curie temperature, thermal energy disrupts magnetic ordering, causing iron to lose ferromagnetism and become paramagnetic.
Q9. Typical number of atoms in a ferromagnetic domain:
Ferromagnetic domains contain about 10⁶ to 10⁸ atoms, aligned to produce a net magnetic moment.

After Chapter 16: Alternating Current, 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 16: Alternating Current 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: Alternating Current

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.

Alternating Current: 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 Alternating Current after the quiz

List the questions you missed from Alternating Current 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.