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

Q.2

Q.3

Q.4

Q.5

Q.6

Q.7

Q.8

Q.9

Q.10

Q.1	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.2	It is possible to measure the passage of 50 electrons per sec with a certain sensitive device. This corresponds to a current of:
	a) 8 x 10-18 A		b) 1.6 x 10-20 A
	c) 8 x 10-20 A		d) 1.6 x 10-19 A

Q.3	In the following question, an assertion and the reason are given. Choose the correct option: Assertion (A): In the periodic table of chemical elements, electron affinity is always found to increase from top to bottom in a group. Reason (R): In a group, the atomic radii generally increase from top to bottom.
	a) Both A and R are true and R is the correct explanation of A		b) Both A and R are true, but R is not the correct explanation of A
	c) A is true, but R is false		d) A is false, but R is true

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	A convex mirror of focal length f produces an image 1/nth of the size of the object. Calculate the distance of the object from the mirror:
	a) (n + 1)/n f		b) (n + 1)f
	c) (n -1)f		d) (n -1/n)f

Q.6	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.7	Study the circuit given below and determine the effective resistance (in Ω) between A and B:
	a) 3R/5		b) 5R/3
	c) 3R/7		d) 7R/3

Q.8	Match List I (Vegetative propagation type) with List II (Example): Column I (Vegetative propagation type) Column II (Example) 1.     Tuber eye a.     Garlic 2.     Bulb b.     Rose 3.     Cutting c.      Potato 4.     Plantlets at margins of leaves d.     Bryophyllum
	a) 1 – c, 2 – a, 3 – d, 4 – b		b) 1 – c, 2 – a, 3 – b, 4 – d
	c) 1 – a, 2 – b, 3 – d, 4 – c		d) 1 – b, 2 – d, 3 – c, 4 – a

Q.9	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.10	Which of the following statements correctly describes the concept of sustainable development? Planned growth with minimum damage to the environment Growth irrespective of the extent of damage caused to the environment Stopping all developmental work to conserve the environment Growth that is acceptable to all the stakeholders
	a) i and iv		b) ii and iii
	c) ii and iv		d) iii and iv

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.