Introduction
Welcome to Bhautik Study, your trusted platform for Physics learning and exam preparation. Class 12 Physics begins with Chapter 7 – Alternating Current, the foundation of electrostatics. This chapter introduces electric charges, Coulomb’s law, the superposition principle, electric fields, dipoles, and Gauss’s law.
A strong understanding of this chapter is crucial for success in CBSE Board Exams, JEE Main, JEE Advanced, and NEET. To help students, we at Bhautik Study have prepared a free practice paper PDF for Chapter 7. It includes theoretical, numerical, and competitive-level multiple-choice questions to strengthen your concepts.
Alternating Current (AC) is one of the most practical and significant topics in the Class 12 Physics syllabus. Unlike Direct Current (DC), where the flow of electric charge is in a single direction, AC is a form of electric current that reverses its direction periodically. This chapter not only builds on the knowledge of electricity and magnetism from earlier chapters but also provides students with a deep understanding of real-world applications, since alternating current is the backbone of modern power systems and electrical appliances.In this chapter, students learn how alternating current behaves in different electrical circuits containing resistors, capacitors, and inductors. Unlike DC circuits, analyzing AC circuits involves the use of concepts like phase difference, reactance, and impedance. The introduction of mathematical tools like phasor diagrams and complex numbers provides a more advanced and practical way to handle calculations, helping students develop strong problem-solving skills.
Another vital aspect of this chapter is the study of power in AC circuits. Since voltage and current are not always in the same phase, the idea of average power and power factor becomes important. Understanding the power factor helps in explaining why industries use power factor correction methods and capacitors to ensure efficient electricity usage.
Resonance in AC circuits is another fascinating concept. Just like mechanical resonance, electrical resonance occurs when the inductive reactance equals the capacitive reactance, leading to a maximum current in the circuit. This principle is applied in many devices, such as radio receivers, tuning circuits, and even in certain medical equipment.
The chapter also introduces students to transformers, which are crucial in the transmission and distribution of electricity. The principle of mutual induction and the efficiency of transformers are explained, giving students insights into how high-voltage transmission minimizes energy losses. Without transformers, the large-scale distribution of power would not be possible.
From an exam perspective, this chapter is highly important. Derivations such as the expression for current in LCR circuits, average power in AC circuits, and resonance conditions are frequently asked in board exams. Numerical problems involving impedance, phase difference, and resonance also form a significant part of competitive exams like JEE and NEET. Mastering these problems requires both conceptual clarity and mathematical accuracy.
At Bhautik Study, we understand that practice is the key to mastering Physics. That’s why we are offering a free practice paper PDF for Class 12 Physics Chapter 7 – Alternating Current. This PDF has been carefully designed by subject experts to cover NCERT syllabus questions, previous year exam problems, and advanced numerical challenges for JEE/NEET aspirants.
📖 Preview – Class 12 Physics Chapter 7 Practice Paper
Before downloading, you can preview the first few pages of the practice paper below. This helps you get an idea of the type and level of questions included in the PDF.
👉 For the full paper, Download the Complete PDF Here.
📥 Download Section
Get the Class 12 Physics Chapter 7 – Alternating Current (Medium Level) practice paper prepared by Bhautik Study. This PDF is designed to strengthen your concepts and prepare you for Board Exams, JEE, and NEET.
File Size: 1.2 MB | Format: PDF | Chapter: 7 | Level: Medium
🌟 Importance of Chapter 7 – Alternating Current
Chapter 7, Alternating Current (AC), holds immense significance in Class 12 Physics as it connects theoretical concepts of electromagnetism with practical applications in everyday life. This chapter deals with the behavior of electric current that changes its direction and magnitude with time, unlike direct current (DC) which remains constant.
Understanding AC circuits is essential because most of the electrical power we use in our homes, schools, and industries is transmitted and distributed in the form of alternating current. The chapter explains key concepts like:
AC generation and sinusoidal variation of voltage and current.
Peak and RMS values that help us analyze power consumption.
Reactance and impedance in resistive, inductive, and capacitive circuits.
Resonance in AC circuits, a critical concept for tuning in radios, communication systems, and power transmission.
Power in AC circuits and the role of the power factor in efficient energy usage.
From an exam perspective, Chapter 7 is extremely important as it frequently contributes both theory questions and numerical problems. Questions related to resonance, phasor diagrams, and LC circuits are highly scoring if concepts are clear.
From a practical viewpoint, this chapter bridges school physics with real-world applications such as:
How electricity is supplied to our homes.
Why transformers and transmission lines work efficiently with AC.
How alternating current is used in household appliances, industries, and power grids.
Thus, mastering this chapter not only helps in board exams and competitive exams like JEE/NEET, but also builds a foundation for understanding electrical engineering, electronics, and communication systems in higher studies.
🌟 Why Practice Chapter 7 Thoroughly?
Chapter 7 – Alternating Current is one of the most scoring and conceptually rich parts of Class 12 Physics. Practicing this chapter thoroughly gives you multiple advantages:
High Weightage in Exams – Questions from AC circuits, resonance, transformers, and power factor are frequent in both board exams and entrance tests (NEET/JEE).
Strengthens Conceptual Clarity – Solving problems on RMS values, reactance, and impedance helps you build strong fundamentals of electricity.
Boosts Numerical Solving Skills – This chapter is filled with numerical applications, making practice essential to gain speed and accuracy.
Direct Real-Life Applications – Alternating Current powers our homes and industries, so mastering it connects theory with practical usage.
Improves Problem-Solving Strategy – Regular practice makes you comfortable with circuit analysis, resonance conditions, and graphical interpretation.
📘 Detailed Syllabus Breakdown – Chapter 7: Alternating Current
Chapter 7 focuses on the study of AC (Alternating Current), its generation, behavior in different circuits, and applications. Below is the topic-wise breakdown:
🔹 1. Basics of Alternating Current
Concept of AC and how it differs from DC
Peak value, average value, and RMS value of AC
Angular frequency, time period, and phase difference
🔹 2. AC Circuits with Components
AC through a resistor (R)
AC through an inductor (L)
AC through a capacitor (C)
Phasor diagrams and mathematical expressions
🔹 3. RLC Series Circuit
Impedance and phase relationship
Power in an AC circuit
Power factor and its importance
Variation of current and voltage with frequency
🔹 4. Resonance in AC Circuits
Condition for resonance in RLC series
Impedance at resonance
Graphical representation of resonance
Quality factor (Q-factor) and its significance
🔹 5. Transformers
Working principle of transformers
Step-up and step-down transformers
Energy losses in transformers
Applications in power transmission
🔹 6. Important Graphs and Derivations
Voltage-current graphs for R, L, and C circuits
Phasor diagrams for R, L, C, and RLC circuits
Derivation of average power in AC circuits
✅ Exam Note: This chapter carries 5–7 marks in CBSE Board exams and is equally important for JEE & NEET aspirants, especially numerical-based questions.
Highlights of the PDF – Class 12 Physics Chapter 7 (Alternating Current)
The Class 12 Physics Chapter 7 – Alternating Current Practice Paper PDF is more than just a collection of questions—it’s a complete preparation toolkit for board exams, JEE, and NEET aspirants. At Bhautik Study, we believe that every student has the potential to score high if they combine smart preparation with the right resources. This PDF is designed to give you clarity, confidence, and consistency in one of the most scoring chapters of Physics.
Comprehensive Coverage of Topics
This practice paper covers the entire NCERT syllabus of Alternating Current in a structured manner. You will find well-framed questions on key concepts like:
AC voltage applied to a resistor, inductor, and capacitor
Series LCR circuit (resonance and Q-factor)
Power in AC circuits (average, RMS, power factor)
LC oscillations and resonance phenomena
Transformers and their applications
Analytical problems involving phasor diagrams
With this wide coverage, you won’t miss out on any concept that could appear in your exams.
Balanced Mix of Questions
The paper contains a blend of conceptual, numerical, and higher-order thinking problems. Easy questions help you build confidence, while medium and difficult questions push you to apply your understanding in real exam-like conditions. This balance ensures that you can attempt both board-level and competitive exam questions effectively.
Step-Up Learning Approach
Instead of random questions, the PDF is organized in a progressive way—starting from simple recall-based questions and gradually moving towards application-based and analytical problems. This step-by-step approach makes revision more systematic and less stressful.
Motivation to Keep Going
We know that Physics can sometimes feel challenging, especially when numerical problems seem tricky. But remember—every expert was once a beginner. Each question you solve brings you one step closer to mastery. This practice paper is not just about testing your knowledge, but about building the self-belief that you can crack even the toughest problems.
When you sit down with this PDF, don’t think of it as a test—think of it as a training ground for success. Every time you get stuck, remind yourself:
“If it’s difficult, it means I am learning.”
“If I solve it, I will never forget it.”
“Every question solved today is an extra mark secured tomorrow.”
Stay consistent, and you’ll be amazed at how quickly your confidence in Alternating Current improves.
Exam-Oriented Design
The questions are prepared with real exam patterns in mind. Many of these problems reflect the latest CBSE trends and the type of questions JEE/NEET aspirants face. By practicing regularly, you not only prepare for exams but also develop speed and accuracy—two skills that are absolute game-changers.
Free & Student-Friendly
At Bhautik Study, we strongly believe that education should be accessible to everyone. That’s why all our practice papers, including this Chapter 7 PDF, are 100% free to download. You don’t need to pay anything—just download, practice, and improve.
Final Motivation
Physics is not about memorizing formulas—it’s about understanding the beauty of how the world works. Chapter 7 – Alternating Current is not only important for exams but also forms the foundation for real-world applications like household electricity, transformers, and communication systems.
So, when you practice with this PDF, think beyond marks. Think about how each concept is shaping your analytical skills and problem-solving mindset. Success in Physics comes to those who practice with passion and consistency.
Be regular. Challenge yourself with tough questions. Celebrate small victories.
And most importantly—believe in yourself. Because if you stay disciplined and motivated, this chapter can become your strongest weapon in Physics.
📌 How to Use This Practice Paper
Revise NCERT examples and theory before solving.
Attempt questions in a time-bound manner (simulate exam).
Focus on derivations and formula-based problems.
Identify weak areas and revise with NCERT and your notes.
Welcome to Bhautik Study’s Class 12 Physics Practice Paper series. Here you can download free practice papers for Chapter 7 – Alternating Current to strengthen your preparation for CBSE, JEE, and NEET exams.
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📥 Download PDF: Class 12 Physics Chapter 7 Practice Paper
Frequently Asked Questions (FAQs)
Q1: What is covered in Class 12 Physics Chapter 7 – Alternating Current?
It covers AC voltage applied to resistor, inductor, and capacitor, phasor diagrams, LC oscillations, resonance, transformers, and power in AC circuits.
Q2: How do these practice papers help in CBSE board exam preparation?
These practice papers follow the NCERT Class 12 syllabus and contain conceptual and numerical problems important for CBSE board exams.
Q3: Are these papers useful for JEE and NEET?
Yes, AC circuit questions are frequently asked in JEE Main, JEE Advanced, and NEET. These practice sets include application-based numericals and problem-solving exercises.
Q4: Is there any cost for downloading these papers?
No, all practice papers are completely free to download from Bhautik Study.