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

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Q.9

Q.10

Q.1	In the following question, an assertion and a reason are given. Choose the correct option: Assertion: According to Döbereiner's, a group of three similar elements arranged in their increasing atomic weights show that the atomic weight of middle is equal to the arithmetic mean of the other two elements. Reason: Atomic weight is equal to one-twelfth of the mass of a carbon atom.
	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.2	Choose the correct option and complete the following sentence: Sexual reproduction causes genetic variation because of _____________. blending of genes chromosomal changes shuffling of genes
	a) Only 1		b) Only 2
	c) Only 3		d) All of the above

Q.3	Choose the correct option and complete the following sentence: An electric motor consists of ____________. I. rectangular coil of insulated copper wire II. two poles of a magnetic field III. split rings IV. conducting brushes
	a) I and II		b) I, II and III
	c) I, II, III and IV		d) None of these

Q.4	Why shouldn't we light a candle in a closed room with people?
	a) The CO2 formed causes breathlessness.		b) Carbon particles are formed which are dangerous for the respiratory tract.
	c) Methane gas, which is poisonous, is formed.		d) Carbon monoxide gas which reduces the ability of blood to carry oxygen is formed.

Q.5	Identify the correct sequence of fractions obtained when petroleum is subjected to fractional distillation: Lubricating oil Petrol Petroleum ether Diesel oil
	a) 2, 3, 4, 1		b) 3, 2, 4, 1
	c) 3, 2, 1, 4		d) 2, 4, 3, 1

Q.6	Which environmental hazard is not contributed by the combustion of fossil fuels?
	a) Acid rain		b) Greenhouse effect
	c) Destruction of wildlife habitat		d) Air pollution

Q.7	Which of the following equations is not an example of displacement reaction?
	a) 2Al + Fe2O3 → Al2O3 + 2Fe		b) Ca + Cl2 → CaCl2
	c) 2Kl + Cl2 → 2KCl + l2		d) 2Na + 2H2O → 2NaOH + H2

Q.8	Match the entries of Column I with those of Column II:   Column I   Column II 1.     Stomata a.     Anaerobic respiration 2.     Mangrove trees b.     Intake of CO2 3.     Wood stem c.      Pneumatophores 4.     Yeast d.     Lenticels
	a) 1 – b, 2 – c, 3 – d, 4 – a		b) 1 – b, 2 – a, 3 – d, 4 – c
	c) 1 – d, 2 – a, 3 – c, 4 – b		d) 1 – a, 2 – b, 3 – c, 4 – d

Q.9	Identify the phenomenon by which a new set of the population is formed from the change in the frequency of some genes:
	a) Genetic drift		b) Organic evolution
	c) Variations		d) Speciation

Q.10	Which one of the following elements is alloyed with iron to produce steel which can resist high temperatures and also have high hardness and abrasion resistance?
	a) Aluminium		b) Chromium
	c) Nickel		d) Tungsten

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.