Are you in Class 12 Science and worried about the 2027 board exams? Do you study theory but still make mistakes in MCQs? You are not alone. Many students face the same problem.
The good news is – the CBSE exam pattern has changed for 2026–27. Now, 50% of the paper is Competency-Based Questions (CBQs). Most of these are MCQs, case studies, and assertion-reason questions. This means if you practise MCQs the right way, you can score much higher.
In this blog, we will cover:
- The new 2027 exam pattern
- Subject-wise important chapters (Physics, Chemistry, Maths, Biology, English)
- How to practise chapter-wise MCQs effectively
- Where to find free, distraction-free online tests
- And a step-by-step plan to improve your marks
Let’s start.
Best Way to Practise Class 12 Science MCQs for 2027
The best way is to take chapter-wise online MCQ tests that include Competency-Based Questions (CBQs) and previous year questions. Start with a free sample test for each subject. After finishing a chapter, take its test. Review the explanation for every wrong answer. Then move to the next chapter. After all chapters, attempt full mock tests. This method improves speed, accuracy, and weak area identification.
Why Class 12 Science MCQ Practice is Important for 2027
For many years, CBSE focused on long answers and theory. That has changed. For the 2026–27 session, CBSE has introduced a new 50-20-30 rule:
Type of Question | Percentage | Examples |
Competency-Based Questions (CBQs) | 50% | MCQs, case studies, assertion-reason, data analysis, source-based questions |
Objective Type | 20% | Standard MCQs, fill in the blanks, one-word answers |
Constructed Response | 30% | Short answer and long answer questions |
What does this mean for you?
70% of your paper is now MCQs or objective-type questions. If you only study theory and never practise MCQs, you will struggle to finish the paper on time. You will also lose marks on application-based questions.
Want to check if your chapter is ready?
Take a free 10-question MCQ test for any Class 12 Science subject. No login needed.
Start Your Free Test
Class 12 Science Subjects Covered – Complete List
For the CBSE Class 12 Science stream, you have two main combinations:
- PCM – Physics, Chemistry, Mathematics
- PCB – Physics, Chemistry, Biology
Plus one compulsory subject: English Core.
We will now see the important chapters for each subject.
1. Class 12 Physics MCQ Test – Important Chapters
Physics is often the most feared subject. But with regular chapter-wise MCQ practice, you can master it. Here are the most important chapters for the 2027 board exam:
Chapter Name | Why Important |
Electrostatics | High weightage, many numerical MCQs |
Current Electricity | Conceptual + numerical questions |
Magnetic Effects & Magnetism | Assertion-reason questions common |
Electromagnetic Induction | Direct & indirect MCQs |
Alternating Current | Formula-based MCQs |
Optics (Ray & Wave) | Very high weightage – diagram-based MCQs |
Dual Nature of Radiation & Matter | Small but sure questions |
Atoms & Nuclei | Theory-based MCQs |
Semiconductor Electronics | Easy marks – logic gate MCQs |
Quick Tip: For Physics, focus on understanding formulas and units. Many MCQ mistakes happen because students forget the sign or unit.
2. Class 12 Chemistry MCQ Test – Important Chapters
Chemistry has three parts: Physical, Organic, and Inorganic. You need to practise all three.
Chapter Name | Type | MCQ Focus |
Solutions | Physical | Concentration calculations |
Electrochemistry | Physical | Nernst equation, cell potential |
Chemical Kinetics | Physical | Rate laws, half-life |
d & f Block Elements | Inorganic | Properties, colour, magnetic behaviour |
Coordination Compounds | Inorganic | IUPAC naming, isomerism |
Haloalkanes & Haloarenes | Organic | Reaction mechanisms |
Alcohols, Phenols & Ethers | Organic | Distinguishing tests |
Aldehydes, Ketones & Carboxylic Acids | Organic | Named reactions |
Amines | Organic | Basicity order |
Biomolecules | Organic | Structure of glucose, vitamins |
Quick Tip: For Inorganic Chemistry, read NCERT line by line. Exam MCQs are often directly from NCERT paragraphs.
Stuck on a chapter? Test yourself immediately with a chapter-wise Chemistry MCQ test. Get instant score and explanations.
Try Class 12 Chemistry MCQ test for free here
3. Class 12 Mathematics MCQ Test – Important Chapters
Maths MCQs test your speed and formula recall. The new pattern also includes case-study based MCQs.
Unit | Chapters | MCQ Weightage |
Relations & Functions | Relations, Functions, Inverse Trig | Medium |
Algebra | Matrices, Determinants | High |
Calculus | Continuity, Differentiability, Integration, Differential Equations | Very High |
Vectors & 3D Geometry | Vector Algebra, Three Dimensional Geometry | High |
Probability | Probability | Medium |
Linear Programming | LPP | Low (but easy marks) |
Quick Tip: Practise calculus MCQs daily. At least 10 questions per day. You will see improvement in 15 days.
4. Class 12 Biology MCQ Test – Important Chapters (For PCB students)
Biology has a very long syllabus. But if you focus on NCERT, you can score well.
Chapter Name | Why Important |
Sexual Reproduction in Flowering Plants | Diagram-based MCQs common |
Human Reproduction | High weightage – hormones & anatomy |
Reproductive Health | Small chapter – direct questions |
Principles of Inheritance & Variation | Genetics – very high weightage |
Molecular Basis of Inheritance | DNA replication, transcription – MCQs sure |
Evolution | Theory-based – easy marks |
Human Health & Disease | Immunity, AIDS, cancer – common MCQs |
Biotechnology & Its Applications | NCERT-based MCQs |
Ecosystem & Environment | Ecology – food chain, pyramids |
Quick Tip: Never skip NCERT diagrams. Many Biology MCQs are asked directly from diagrams and their labels.
5. Class 12 English Core MCQ Test – What to Practise
English Core also has MCQs now. They appear in two sections:
- Reading Comprehension: Unseen passage with 5–8 MCQs. Questions test vocabulary, inference, and main idea.
- Literature: From Flamingo and Vistas. Extract-based MCQs (poems and prose), character-based MCQs, and theme-based MCQs.
Quick Tip: Practise at least one unseen passage every week. For literature, read the summary of each chapter before attempting MCQs.
What is the Marking Scheme for Class 12 Science 2027?
For theory subjects (Physics, Chemistry, Biology):
- Theory exam: 70 marks
- Practical / Internal assessment: 30 marks
- Passing marks: 33% in aggregate (theory + practical)
For Mathematics:
- Theory exam: 80 marks
- Internal assessment: 20 marks
For English Core:
- Theory exam: 80 marks
- Internal assessment: 20 marks
Important: The 50% CBQ rule applies to the theory paper (70 or 80 marks). So out of 70 marks in Physics, around 35 marks will be Competency-Based Questions – mostly MCQs and case studies.
Don’t wait for exams to start. Practise with the exact 2027 pattern. Your first test is free.
Take a free Class 12 Science MCQ test now
Features of a Good Class 12 Science Online Test Platform
Not all online test websites are good. Many free websites have wrong answers, too many ads, or old syllabus questions. Here is what you should look for:
Feature | Why You Need It |
Chapter-wise tests | You can test only one chapter at a time. Finds weak chapters easily. |
Explanation for every question | Understand why your answer is wrong. Learn the concept, not just the answer. |
Previous year questions (PYQs) | Real exam questions from past CBSE, CUET, JEE, NEET papers. |
Competency-based questions (CBQs) | Exactly what CBSE asks from 2027. Case studies, assertion-reason, data-based. |
Instant score & analysis | See your mistakes immediately. No waiting. |
Mobile-friendly (no app) | Open in phone browser. No download, no storage problem. |
Free sample test | Try first. Pay only if you like it. |
No ads / distraction-free | Focus only on the test. No pop-ups, no video ads, no notification spam. |
Updated syllabus | Questions match the latest NCERT and CBSE 2026–27 pattern. |
Why Choose Aspirations Institute MCQ Test Portal?
The Aspirations Institute MCQ portal is built specifically for students like you. Here are the facts:
- 28,000+ MCQs – All manually checked by subject experts with 8–25 years of teaching experience.
- Covers CBSE Class 12 Science (PCM & PCB), CUET, JEE Main, NEET – One platform for all your goals.
- Updated for 2026–27 – Includes the new Competency-Based Questions (CBQs) pattern.
- PYQs integrated into every test – You don’t have to search separately for old papers.
- Explanations for every single question – Right or wrong, you get a clear reason.
- Free sample test – No login, no payment. Just open and try.
- No app needed – Works on any Android phone, iPhone, or laptop browser.
- Zero distractions – No ads, no pop-ups, no upsells during the test.
- 10,000+ students have already used it – Trusted by real students across India.
- 21+ years of educational experience – Aspirations Institute has been teaching since 2004.
See the difference yourself. Try a free test and compare with other websites. You will feel the focus.
Start your free Class 12 Science MCQ test here
How Do Aspirations Institute Tests Compare with Free Websites and Big Apps?
Feature | Aspirations Institute | Free Websites (SelfStudys, StudiesToday) | Large Apps (Vedantu, PW, Byju’s) | Offline PDFs |
Chapter-wise tests | Yes | Mostly subject-wise | Yes but expensive | No |
Explanation for every question | Yes (detailed) | Often missing or one-line | Yes | No |
Competency-based questions (CBQs) | Yes (2027 pattern) | Rare | Some | No |
Previous year questions | Yes (integrated) | Separate section | Yes but extra cost | Only in books |
Mobile-friendly without app | Yes | Poor mobile experience | Requires app | Not interactive |
Ad-free / distraction-free | Yes | Many pop-ups and ads | Yes but costly | No ads |
Free sample test | Yes (no login) | Usually no | Limited free tests | Not applicable |
Price | Affordable (one subject or full pack) | Free (but low quality) | ₹10,000 – ₹30,000 per year | ₹500 – ₹1,000 per book |
The difference is clear. Aspirations Institute gives you quality, focus, and affordability – without forcing you to download heavy apps or watch long video ads.
Step-by-Step Plan to Master Class 12 Science MCQs
You don’t need to study 10 hours a day. Just follow this simple 6-step plan:
Step 1: Revise the NCERT chapter-
Read the theory once. Mark important formulas, definitions, and diagrams.
Step 2: Take a chapter-wise MCQ test-
Open the Aspirations Institute portal. Select your subject and chapter. Attempt the test.
Step 3: Review explanations-
After the test, see which answers were wrong. Read the explanation carefully. Note down why you made the mistake.
Step 4: Re-study weak concepts-
Open your NCERT book again. Focus only on the concepts where you made mistakes.
Step 5: Retake the same chapter test-
Take the same test again. Your score should improve. Repeat until you get 90%+.
Step 6: Move to the next chapter-
Finish one chapter completely before moving to the next.
After finishing all chapters, Take full subject-wise mock tests with a timer. Simulate real exam conditions.
Ready to start your 6-step plan? Your first chapter test is completely free. No credit card, no signup mess.*
Click here to take your first free Class 12 Science MCQ test
Frequently Asked Questions (FAQs)
How many MCQ questions come in the CBSE Class 12 Science board exam 2027?
There is no fixed number of MCQs. But MCQs + Competency-Based Questions together make up about 70% of the paper. That means roughly 35–40 questions out of 50–60 total questions can be MCQs or CBQs.
What is the 50% Competency-Based Question (CBQ) rule for Class 12 2027?
CBSE has mandated that 50% of the question paper will test competencies – application, analysis, and real-life problem solving. These appear as MCQs, case studies, assertion-reason, data interpretation, and source-based questions.
Which chapters are most important for Class 12 Physics MCQ test 2027?
Electrostatics, Current Electricity, Optics (Ray & Wave), Electromagnetic Induction, and Semiconductors are the most important. These chapters alone cover more than 50% of the physics MCQ weightage.
Which chapters have the highest weightage in Class 12 Chemistry MCQs?
Electrochemistry, Chemical Kinetics, Coordination Compounds, Haloalkanes & Haloarenes, Aldehydes & Ketones, and Biomolecules. These 6 chapters cover nearly 60% of chemistry MCQs.
Which Biology chapters are most important for Class 12 board MCQs?
Genetics (Principles of Inheritance & Molecular Basis), Human Reproduction, Biotechnology, and Ecology. These four units usually account for 50–60% of biology MCQs.
How many questions are there in the Class 12 Maths MCQ test?
It depends on the test you choose. Chapter-wise tests usually have 15–30 MCQs. Full subject mock tests can have 40–50 MCQs, matching the board exam pattern.
Can I take Class 12 Science MCQ tests on my phone without an app?
Yes. The Aspirations Institute portal works directly in your mobile browser. Open Chrome or any browser, go to Aspirations Institute Test Portal, and start your test. No download needed.
Is it better to practice chapter-wise MCQs or full mock tests first?
Always start with chapter-wise tests. They help you find weak chapters quickly. After finishing all chapters, then take full mock tests. That order gives the best results.
How many total MCQs does the Aspirations Institute Class 12 Science portal have?
The portal has more than 28,000 MCQs across all subjects and exams. For Class 12 Science alone, there are thousands of chapter-wise, CBQ, and PYQ-based questions.
Are previous year questions (PYQs) included in these tests?
Yes. Previous year board questions (CBSE), CUET PYQs, JEE Main PYQs, and NEET PYQs are integrated into regular chapter-wise tests. You don’t have to search separately.
Is there a free Class 12 Science MCQ test I can try before buying?
Absolutely. Every subject has a free 10-question sample test. No login, no email, no payment. You can try Physics, Chemistry, Maths, Biology, or English for free right now.
How do Class 12 Science MCQs help in JEE Main and NEET preparation?
The NCERT syllabus is the same for boards and entrance exams. When you practise chapter-wise MCQs for boards, you are also preparing for JEE/NEET. The portal includes JEE and NEET pattern questions as well.
Does the portal include competency-based questions for the 2027 exam pattern?
Yes. The entire question bank has been updated for the 2026–27 academic session. You will find case studies, assertion-reason, data-based, and source-based MCQs – exactly as CBSE demands.
What is the passing marks for CBSE Class 12 Science subjects in 2027?
You need at least 33% marks in aggregate (theory + practical). For a subject with 70 theory marks + 30 practical, you need roughly 23 marks in theory and 10 in practical to pass.
Can I practice English Core MCQs for Class 12 online?
Yes. The portal has English Core MCQs for reading comprehension (unseen passages) and literature (Flamingo and Vistas). Extract-based MCQs and vocabulary questions are also included.
How many times can I attempt a chapter-wise test?
As many times as you want. There is no limit. You can retake any test to improve your score. This is very useful for revision before exams.
Will the explanations show why the wrong options are incorrect?
Yes. Every explanation clearly tells you: (1) why the correct answer is right, (2) why each wrong option is wrong, and (3) which concept you need to revise.
Does CBSE have negative marking in Class 12 board exams?
No. CBSE board exams do not have negative marking for MCQs. You only lose marks if your answer is wrong. But CUET, JEE, and NEET have negative marking, so practise with +5/-1 pattern there.
What is the difference between a standard MCQ and a competency-based MCQ?
A standard MCQ tests recall – “What is the formula of X?” A competency-based MCQ tests application – “In this real situation, which formula will you use and why?” The second type requires deeper understanding.
How soon can I start the free test – do I need to sign up?
You can start immediately. Open Aspirations Institute Test Portal, choose your subject, click the free test, and begin. No sign-up, no email, no phone number. Instant access.
Final Words – Your 2027 Board Exam Success Starts Now
The 2027 CBSE board exams are different from previous years. The focus has shifted from rote learning to real understanding. Competency-Based Questions are here to stay. The students who start practising early will have a huge advantage.
You don’t need expensive coaching or complicated apps. All you need is:
- A clear chapter-wise plan
- A reliable MCQ test platform with explanations
- Daily 30 minutes of focused practice
- And the discipline to review your mistakes
The Aspirations Institute MCQ portal gives you all of that. 28,000+ MCQs, chapter-wise tests, detailed explanations, PYQs, CBQs, and a completely distraction-free interface – all at an affordable price. And you can try everything for free first.
Stop guessing. Start practising.
Take your free Class 12 Science MCQ test in the next 5 minutes.
Subjects available: Physics, Chemistry, Mathematics, Biology, English Core – all chapter-wise, all updated for 2027.
- Class 12 Physics Chapter-wise MCQ Test
- Class 12 Chemistry MCQ Online Test
- Class 12 Maths MCQ Practice
- Class 12 Biology MCQ Questions
- Class 12 English Core MCQ Test
- CUET 2027 MCQ Practice
- JEE Main Chapter-wise Test
- NEET Biology MCQ Series.
