CBSE Class 12 Important Questions All Subjects

Physics Wallah Academic Expert
November 29, 2023

CBSE Class 12 Important Questions are your go-to source for the most up-to-date questions and solutions aligned with the latest NCERT (CBSE) guidelines. By practicing these chapter-based CBSE Class 12 Important Questions and reading the detailed explanations created by our experts, students can resolve any problems they may have about each chapter. 

CBSE Class 12 Important Questions: As the CBSE Class 12 board exams approach, students often find themselves on a quest for effective study resources that will not only help them grasp the subject matter but also fine-tune their exam preparation. In this critical phase of their academic journey, the significance of CBSE Class 12 Important Questions across all subjects cannot be overstated.

The Class 12 board exams are milestones that can shape a student's future, and thorough preparation is the key to success. However, more than simply relying on textbooks and class notes may be required. CBSE Class 12 Important Questions subject-wise come to the rescue as an indispensable resource to aid students in their exam readiness. 

These questions are designed to go beyond the conventional, offering a diverse set of problems and scenarios to help students build a strong foundation and hone their problem-solving skills.

CBSE Class 12 Important Questions Overview

CBSE Class 12 Important Questions provide students a valuable resource to enhance their preparation for the board exams. These questions are curated to cover essential topics and concepts from the CBSE (Central Board of Secondary Education) syllabus. 

The critical questions are tailored to match the CBSE syllabus, ensuring that students focus on the topics and concepts prescribed by the board. This alignment with the official syllabus helps students prepare effectively for the board exams.

CBSE Class 12 Important Questions and CBSE Class 12 extra questions are designed to match the pattern and format of the CBSE board exams. Students can familiarize themselves with the types of questions they are likely to encounter in the actual exams.

CBSE Class 12 Important Questions are a structured and exam-focused resource that can significantly benefit students preparing for their board exams. They help students enhance their knowledge, develop effective study strategies, and perform well in the CBSE Class 12 board examinations. So, learn CBSE class 12 important questions and focus on your preparation.

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CBSE Class 12 Overview

Subject Description
Subjects Offered Science, Commerce, Arts
Syllabus CBSE (Central Board of Secondary Education)
Examination CBSE Class 12 Board Exams
Importance Determines eligibility for higher education
Duration One academic year (April to March)
  • Science: PCM (Physics, Chemistry, Mathematics), PCB (Physics, Chemistry, Biology), PCMB (Physics, Chemistry, Mathematics, Biology)
  • Commerce: Business Studies, Accountancy, Economics - Arts: Humanities, various elective subjects
Grading System CGPA (Cumulative Grade Point Average) on a 10-point scale
  • Internal assessment
  • Practical exams
  • Theory exams
Core Subjects
  • English
  • Physics
  • Chemistry
  • Biology (for PCB)
  • Mathematics (for PCM and PCMB)
  • Accountancy (Commerce)
  • Business Studies (Commerce)
  • Economics (Commerce)
Optional Subjects Various options in Arts stream
Results Published usually in May/June
Eligibility Successful completion of Class 11

CBSE Class 12 Important Questions Physics

The physics question paper is structured into four sections, namely Section A, Section B, Section C, and Section D. Section A, which previously had 20 one-mark questions, may now include objective questions as well. Section B comprises seven questions, each carrying two marks, while Section C consists of seven questions, each with a weightage of three marks. 

Section D comprises three questions, each assigned a five-mark weight. Importantly, there is no provision for an overall choice, but internal choices are available. For example, two questions of one mark each, two questions of two marks each, one question worth three marks, and three questions with a five-mark value provide candidates with the option to select one from the choices offered in such questions. Here are the CBSE class 12 important questions Physics:

CBSE Class 12 Important Questions Physics

Unit Number Unit Name Questions
1 Electric Charges and Fields
  • What is the basic difference between conductors and insulators? 

  • Define the electric field intensity. 

  • Explain Coulomb's law and its mathematical expression. 

  • Derive the formula for the electric field due to a uniformly charged thin spherical shell.

2 Electrostatic Potential and Capacitance
  • Define electric potential. 

  • What are its SI units? 

  • Explain the concept of equipotential surfaces. 

  • Derive the expression for the capacitance of a parallel plate capacitor. 

  • How is the energy stored in a charged capacitor calculated?

3 Current Electricity
  • State Ohm's law. Explain its limitations. 

  • Define drift velocity and its relation to the current. 

  • Describe the factors affecting the resistance of a conductor. 

  • Explain the working principle of a Wheatstone bridge.

4 Moving Charges and Magnetism
  • Describe the magnetic field lines around a current-carrying straight conductor. 

  • Explain Ampere's circuital law. 

  • How does it relate to the magnetic field around a straight wire? 

  • Calculate the magnetic field at the center of a circular loop carrying current. Define the magnetic moment of a current loop.

5 Magnetism and Matter
  • Describe the magnetic properties of materials (paramagnetic, diamagnetic, ferromagnetic). 

  • Define hysteresis and explain its significance in magnetic materials. 

  • Differentiate between hard and soft magnetic materials. 

  • What is a solenoid, and how does it function in electromagnets?

6 Electromagnetic Induction
  • Explain Lenz's law and its application in electromagnetic induction. 

  • How does self-inductance differ from mutual inductance? 

  • Describe the working of an AC generator. 

  • Calculate the emf induced in a coil due to a changing magnetic field.

7 Alternating Current
  • Explain the phase difference between current and voltage in an AC circuit. 

  • Describe the resonance phenomenon in series LCR circuits. 

  • Calculate the power consumed in a pure inductive circuit. 

  • What is the power factor, and why is it important in AC circuits?

8 Electromagnetic Waves
  • Explain the characteristics of electromagnetic waves. 

  • Describe the properties of the electromagnetic spectrum. 

  • What are the uses of microwaves in communication? 

  • How do electromagnetic waves transport energy?

9 Ray Optics and Optical Instruments
  • Calculate the critical angle for total internal reflection. 

  • Define the power of a lens and its SI unit. 

  • Describe the formation of a rainbow. 

  • How do optical instruments like microscopes and telescopes work?

10 Wave Optics
  • Describe the diffraction and polarization of light. 

  • What is interference in the context of wave optics?

  •  Define coherent sources of light. 

  • How does the interference pattern change with the change in the separation between slits?

11 Dual Nature of Radiation and Matter
  • Define the threshold frequency and stopping potential. 

  • Describe the de Broglie wavelength. 

  • What is the Compton effect, and how does it support the wave-particle duality? 

  • State Heisenberg's Uncertainty Principle.

12 Atoms Explain Bohr's model of the hydrogen atom. Define atomic number, mass number, and isobars. How does the spectrum of hydrogen differ from the spectrum of helium? What is the significance of Planck's quantum theory?
13 Nucleir
  • Define nuclear reactions and nuclear fission. 

  • Describe the basic properties of nuclear radiation. 

  • What is the concept of nuclear binding energy? 

  • Calculate the energy released in a nuclear reaction.

14 Semiconductor Electronics: Materials, Devices, and Simple Circuits
  • Describe the characteristics of a transistor in the common emitter configuration. 

  • How does a diode act as a rectifier? 

  • Define digital electronics and its advantages. 

  • Explain the logic gates OR, AND, NOT, and XOR.

Objective NCERT Punch Physics + Physics Med Easy Handwritten Notes by PW is the perfect combo for the preparation of important questions for Physics class 12.

CBSE Class 12 Important Questions Chemistry

Here are the important questions for CBSE class 12 Chemistry. This table also includes CBSE Class 12 electrochemistry Important Questions. Electrochemistry is the main topic of the Chemistry exam!

Unit Number Unit Name Questions
1 The Solid State
  • Explain the difference between amorphous and crystalline solids.
  • Describe the types of unit cells in a crystal lattice.<br> - Calculate the density of a crystal if given the length of the unit cell and molar mass.
  • Discuss the properties of ionic solids.
2 Solutions
  • Define colligative properties. Explain how the elevation of boiling point is related to the number of solute particles.
  • Calculate the osmotic pressure of a solution using the ideal gas equation.
  • Explain Henry's law and its application in gas-liquid solutions.
  • Discuss the factors affecting the solubility of gases in liquids.
3 Electrochemistry
  • Explain the concept of standard reduction potential (E°).
  • Calculate the standard cell potential (E°cell) for a given electrochemical cell.
  • Define conductivity and molar conductivity. Describe the variation of molar conductivity with concentration.
  • Discuss the applications of fuel cells.
4 Chemical Kinetics
  • Define the rate of a chemical reaction. Explain the factors affecting reaction rates.
  • Describe the integrated rate laws for zero-order, first-order, and second-order reactions.
  • Calculate the rate constant (k) and half-life of a reaction using appropriate data.
  • Discuss the collision theory and the concept of activation energy.
5 Surface Chemistry
  • Explain the role of physisorption and chemisorption in surface chemistry.
  • Define and calculate the Freundlich adsorption isotherm constants.
  • Describe the Langmuir adsorption isotherm. Discuss the applications of colloids in daily life.
  • Explain the role of catalysts and their mechanism.
6 General Principles and Processes of Isolation of Elements
  • Describe the extraction of copper from copper pyrites (chalcopyrite) using a suitable chemical equation.
  • Explain the process of zone refining with a schematic diagram.
  • Discuss the Ellingham diagram and its use in predicting the feasibility of reduction reactions.
  • Define froth floatation and its principle.
7 The p-Block Elements
  • Discuss the trends in the properties of the p-block elements (boron to neon).
  • Explain the formation of different types of oxides and chlorides in p-block elements.
  • Describe the preparation and properties of ammonia and its use as a refrigerant.
  • Discuss the uses of noble gases and their occurrence.
8 The d and f-Block Elements
  • Explain the lanthanide contraction and its consequences.
  • Discuss the magnetic properties of d-block elements.
  • Describe the extraction of iron from its ore (hematite) using a blast furnace.
  • Discuss the properties and applications of actinides.
9 Coordination Compounds
  • Define coordination compounds and ligands. Explain the Werner coordination theory.
  • Describe isomerism in coordination compounds with examples.
  • Calculate the coordination number for a complex given its formula.
  • Discuss the stability of coordination compounds and the chelate effect.
10 Haloalkanes and Haloarenes
  • Explain the mechanism of nucleophilic substitution reactions in haloalkanes.
  • Describe the preparation and uses of DDT and BHC.
  • Discuss the mechanism of electrophilic aromatic substitution reactions in haloarenes.
  • Define organometallic compounds and discuss their importance.
11 Alcohols, Phenols, and Ethers
  • Describe the methods of preparation of alcohols from alkenes and alkynes.
  • Explain the Williamson synthesis of ethers.
  • Discuss the acidic nature of phenols and the formation of diazonium salts.
  • Explain the structure and uses of common phenols and ethers.
12 Aldehydes, Ketones, and Carboxylic Acids
  • Describe the preparation of aldehydes and ketones by oxidation of alcohols and ozonolysis of alkenes.
  • Explain the aldol condensation reaction with examples.
  • Discuss the effect of substituents on the acidity of carboxylic acids.
  • Define esters and discuss their properties and uses.
13 Amines
  • Explain the classification of amines based on the number of alkyl groups attached to nitrogen.
  • Describe the preparation of primary, secondary, and tertiary amines.
  • Discuss the basicity of amines and their reactions with nitrous acid.
  • Define amino acids and discuss their role in the body.
14 Biomolecules
  • Define carbohydrates and classify them as monosaccharides, disaccharides, and polysaccharides.
  • Describe the structure and functions of proteins, enzymes, and vitamins.
  • Explain the structure of nucleic acids and their role in genetic information.
  • Discuss the role of hormones and their chemical nature.
15 Polymers
  • Explain the different types of polymerization processes (addition and condensation).
  • Discuss the structure and uses of common synthetic polymers such as polyethylene and PVC.
  • Describe the natural polymers cellulose, starch, and proteins.
  • Explain the classification of polymers based on their molecular forces.
16 Chemistry in Everyday Life
  • Discuss the classification of drugs based on their pharmacological effects.
  • Describe the principles of antiseptics and disinfectants.
  • Explain the action of analgesics, antibiotics, and antacids.
  • Discuss the importance of food preservatives and artificial sweeteners.


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