CREST Science Olympiad Class 10 Previous Year Papers

Getting ready for the Class 10 Science Olympiad? Practising with previous year question papers is one of the smartest ways to prepare. These papers help students understand the level of questions asked and focus on the most important concepts during revision.

Why These Papers Are a Must-Have

• They include questions from vital topics like Chemical Reactions and Equations, Acids, Bases and Salts, Metals and Non-metals etc.
• They help improve speed, accuracy, and confidence when solving science problems under exam conditions.
• Each paper comes with an answer key, making self-assessment easy and effective.

Download the Science Olympiad Previous Year Paper for Class 10 (PDF) and help your child revise smarter, practice better, and perform their best on exam day.

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Syllabus:

Section 1: Chemical Reactions and Equations, Acids, Bases and Salts, Metals and Non-metals, Carbon and its Compounds, Periodic Classification of Elements, Life Processes, Reproduction in Organisms, Heredity and Evolution, Light-Reflection and Refraction, Human Eye and Colourful World, Electricity, Magnetic Effects of Electric Current, Sources of Energy, Our Environment and its Management.

Achievers Section: Higher Order Thinking Questions - Syllabus as per Section 1

Sample Paper Previous Year Paper Marking Scheme Free Study Material

Q.1

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Q.5

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Q.9

Q.10

Q.1	Which of the following would stop evolution by natural selection from occurring?
	a) If humans became extinct because of an epidemic disease.		b) If a thermonuclear war killed most living organisms and changed the environment drastically.
	c) If ozone depletion led to increased ultraviolet radiation, which may cause many new mutations.		d) If all individuals in a population were genetically identical, and there was no genetic recombination, sexual reproduction, or mutation.

Q.2	If I1 is the first ionization potential, I2 is the second ionization potential, I3 is the third ionization potential and I4 is the fourth ionization potential of an element, then which of the following has the least value?
	a) I1		b) I2
	c) I3		d) I4

Q.3	Fill in the blank: Bronze is often used to make statues and medals whereas brass is used in making utensils, scientific apparatus and cartridges. Both brass and bronze are copper-containing alloys, yet they differ in their chemical composition for additionally containing ___________.
	a) zinc in brass and tin in bronze		b) nickel in brass and tin in bronze
	c) chromium in brass and nickel in bronze		d) iron in brass and nickel in bronze

Q.4	Consider the following reaction: 2CaO + C → CaC2 + 2CO 2CaC2 + 2H2O → X + Y If X is involved in the neutralisation reaction with acid, then Y may be:
	a) CH4		b) C2H2
	c) Ca(OH)2		d) CaH2

Q.5	Label A, B, C and D in the following diagram:
	a) A-Chloroplast, B-Guard cell, C-Air spaces, D-Upper epidermis		b) A-Air spaces, B-Guard cell, C-Chloroplast, D-Epidermis
	c) A-Guard cells, B-Air spaces, C-Chloroplast, D-Upper epidermis		d) A-Epidermis, B-Guard cells, C-Air spaces, D-Chloroplast

Q.6	Fill in the blank: Neutral water with pH of about 7 becomes slightly acidic when aerated. This is because ________________.
	a) oxygen from the air is dissolved in the water which makes the water acidic		b) dirt, which gets contaminated with the water during aeration makes the water acidic
	c) ultraviolet radiation dissociates water molecules and makes water acidic		d) it absorbs carbon dioxide from the air

Q.7	In the following question, an assertion and a reason are given. Choose the correct option: Assertion: In a simple electric circuit, the positive terminal of the battery is a point of lowest potential. Reason: The electronic current flow in a circuit is from a point of highest potential to a point of lowest potential.
	a) Both assertion and reason are correct and reason is the correct explanation of the assertion.		b) Both assertion and reason are correct, but reason is not the correct explanation of the assertion.
	c) Both assertion and reason are incorrect.		d) Both assertion and reason are correct.

Q.8	Fill in the blank: When a ray of light falls on a transparent glass plate, a part of it is reflected and a part is refracted. The reflected and refracted rays can be perpendicular to each other for ____________.
	a) angle of incidence equal to 90o		b) angle of incidence equal to zero
	c) only one angle of incidence		d) more than one angle of incidence

Q.9	In the following question, an assertion and a reason are given. Choose the correct option: Assertion: The magnetic field produced by a current-carrying solenoid is independent of its length and cross-section area. Reason: The magnetic field inside the solenoid is uniform.
	a) Both assertion and reason are true and reason is the correct explanation of assertion		b) Both assertion and reason are true, but reason is not the correct explanation of assertion
	c) Assertion is true, but reason is false		d) Assertion is false, but reason is true

Q.10	Which of the following statements about carbon is/are correct? A. It has a small atomic size. B. Its melting and boiling point is low as compared to other members of the group. C. It shows the electropositive character. D. It shows the maximum tendency of catenation.
	a) A and B correct		b) B and D correct
	c) A, C and D correct		d) A and D correct

Your Score: 0/10

Additional Preparation Resources

Students can also refer to the following resources to level up their CREST Science Olympiad (CSO) exam preparation for class 10 -

1. CREST Science Worksheets Package for class 10 - It is a package of 5 worksheets. The worksheets are in the same pattern as the previous year paper. Hence, very useful for preparation. Existing users can purchase additional practice worksheets by following these steps: Login at https://www.crestolympiads.com/login -> Dashboard -> Additional Practice -> Buy & new users can visit https://www.crestolympiads.com/registration
2. CREST Science Olympiad book for class 10 - The book covers topic-wise reading material, chapter-wise practice questions with answer key & contains the previous year paper. The book is available in both physical and pdf formats. Proceed now to purchase the Olympiad book. Also, students can view & download the first chapter of the Science Olympiad book for class 10 for free.

Note: Don’t forget to download the CREST Science Olympiad past year paper pdf for class 10.