Class 10 Science MCQ Questions – Chapter Wise CBSE

This page is the single directory for class 10 science mcq questions covering all 13 NCERT Class 10 Science chapters — Chemistry, Biology and Physics units together. Each chapter’s MCQ set will include standard single-answer questions, assertion-reason pairs and case-based sets, with every option explained so you know why an answer is right or wrong, not just which one is correct.

Use this hub to find your chapter fast, understand how MCQs are scored in the board paper, and see a worked numerical example before you start practising.

Class 10 Science Chapter-wise MCQ Directory

The table below lists all 13 chapters in NCERT order, with the subject unit and current status. Chapter pages are being built one at a time, so most rows show “Coming soon” for now.

Here is what each chapter actually teaches, so you know what to expect once its MCQ set goes live:

• Chemical Reactions and Equations — balancing chemical equations and telling apart combination, decomposition, displacement and redox reactions. Coming soon.
• Acids, Bases and Salts — the pH scale, reactions between acids and bases, and salts used at home such as baking soda and bleaching powder. Coming soon.
• Metals and Non-metals — the reactivity series, ionic bonding, and how corrosion damages metals over time. Coming soon.
• Carbon and its Compounds — covalent bonding, the homologous series of hydrocarbons, and the chemistry behind soaps and detergents. Coming soon.
• Life Processes — how living organisms carry out nutrition, respiration, transportation and excretion. Coming soon.
• Control and Coordination — the nervous system, reflex action, and hormone-driven responses in plants. Coming soon.
• How do Organisms Reproduce? — the modes of sexual and asexual reproduction and the changes of adolescence. Coming soon.
• Heredity — Mendel’s laws of inheritance and how sex is determined in humans. Coming soon.
• Light – Reflection and Refraction — mirror and lens formulas along with ray diagram construction. Coming soon.
• The Human Eye and the Colourful World — defects of vision, dispersion of light, and why the sky looks blue. Coming soon.
• Electricity — Ohm’s law, combinations of resistance, and calculating electrical power. Coming soon.
• Magnetic Effects of Electric Current — the right-hand rule, magnetic field patterns, and electromagnetic induction. Coming soon.
• Our Environment — ecosystems, food chains, and how ozone depletion affects the biosphere. Coming soon.

For the rest of the syllabus arranged by chapter, visit the Class 10 MCQ Questions hub, which links every subject in this class.

How to Use These MCQs for Board Exam Revision

Guessing an option rarely builds real understanding. Work through each MCQ using this method instead:

1. Read the question stem twice before looking at the options — many marks are lost to misreading, not lack of knowledge.
2. Eliminate options that are obviously wrong first; this narrows your choice to two before you even calculate.
3. Verify the remaining option against the actual concept or formula — do not pick an answer because it “sounds right”.
4. For assertion-reason pairs, check the assertion and the reason separately: is the reason itself a true statement, and does it actually explain the assertion?
5. Time yourself at roughly 40-45 seconds per MCQ, which matches the pace needed for Section A of the board paper.

What You’ll Find Inside Each Chapter’s MCQ Set

Once a chapter page is published, it will follow the same format across the site:

• Standard single-answer MCQs covering definitions, facts and direct concept checks.
• Assertion-reason pairs that test whether you understand cause and effect, not just recall.
• Case-based or source-based question sets built around a short passage, diagram or data table.
• A short explanation for every option — including the wrong ones — so you learn why an option fails, not just that it does.

Sample Solved MCQ: Working Out an Ohm’s Law Numerical

Electricity is one of the more numeric-heavy chapters in this book, so here is a worked example of the kind of numerical MCQ you should expect.

Question: A resistor carries a current of 0.6 A when a potential difference of 9 V is applied across it. What is its resistance, and what current will flow if the voltage is doubled to 18 V, with resistance unchanged?

• (a) 10 Ω; 1.8 A — wrong. Dividing 9 by 0.6 does not give 10; this option comes from an arithmetic slip.
• (b) 15 Ω; 1.2 A — correct. Using Ohm’s law, resistance R = V/I = 9 ÷ 0.6 = 15 ohm. At 18 V, the new current is I = V/R = 18 ÷ 15 = 1.2 A.
• (c) 15 Ω; 2.4 A — wrong. The resistance is right, but this assumes current quadruples when voltage doubles, which contradicts Ohm’s law (I is directly proportional to V, not V squared).
• (d) 5.4 Ω; 3.33 A — wrong. This comes from multiplying V and I instead of dividing, giving a resistance value with no physical basis here.

The working rule to remember: resistance stays constant unless the resistor itself changes, so current always scales in direct proportion to voltage.

Common Mistakes Students Make in Science MCQs

These errors show up across Chemistry, Biology and Physics MCQs, often from rushing rather than not knowing the concept:

• Confusing reaction types — for example, mistaking a displacement reaction for a decomposition reaction because both involve a compound breaking apart or reforming.
• Sign or unit errors in numericals, such as forgetting to convert centimetres to metres in lens and mirror problems, which throws off the final magnitude by a factor of 100.
• Picking an assertion-reason option based on the assertion alone, without checking whether the reason actually explains it — a true assertion paired with an unrelated true reason is still not option (a).
• Misreading words like “NOT” or “except” in case-based question stems, which flips the correct choice entirely.

How Class 10 Science MCQs Fit the CBSE Board Exam Pattern

In the CBSE Class 10 Science paper, Section A is typically made up of objective-type questions worth 1 mark each, including assertion-reason and case-based items. These are scored strictly on the exact correct option — there is no partial credit for a half-right answer.

Because of this strict scoring, treat chapter MCQs as a warm-up for accuracy and speed, not a replacement for long-answer practice. You still need to write full steps and diagrams for Section B and beyond.

You can cross-check any topic against the source material on the official NCERT Class 10 Science textbook page if you want to see how a concept is presented in the original chapter.

Frequently Asked Questions on Class 10 Science MCQs

Are Class 10 Science MCQs enough to score well in the CBSE board exam?

No. MCQs cover Section A of the paper, but Sections B, C and D require long and short answers, diagrams and derivations. Use MCQ practice to build accuracy and speed, then move to full-answer practice.

How many MCQs typically appear in the Class 10 Science board paper?

The exact count varies by year’s question paper design, but Section A is generally made up of 1-mark objective questions, including assertion-reason and case-based items. Check the current year’s CBSE sample paper for the exact split.

Are assertion-reason questions part of Class 10 Science MCQs?

Yes. Assertion-reason pairs are a standard format in Section A. You must judge both the assertion and the reason, and whether the reason actually explains the assertion, before choosing an option.

What is a case-based question in Class 10 Science?

A case-based question gives you a short passage, diagram or data set and asks several MCQs based on it. You have to apply a concept to the given situation rather than recall a fact directly.

When will the chapter-wise Class 10 Science MCQ pages be published?

Chapter pages are being added one at a time. As each one goes live, it will appear as a working link in the directory table above instead of a “Coming soon” label.

Which Class 10 Science chapters have the most numerical MCQs?

Electricity, Light – Reflection and Refraction, and Magnetic Effects of Electric Current carry the most numerical work, since they rely on formulas like Ohm’s law and the mirror/lens equations. Acids, Bases and Salts also includes pH-based calculations.

Reference: NCERT textbooks (CBSE).