CREST Science Olympiad Class 10 Previous Year Paper

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

Previous Year Questions

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Q.5

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Q.7

Q.8

Q.9

Q.10

Q.1	Fill in the blank: When 480 plants are produced in the F2 generation of dihybrid cross made with pure breeding plants, the total number of plants with parental combinations obtained is __________.
	a) 300		b) 270
	c) 30		d) 180

Q.2	In the following question, an assertion and a reason are given. Choose the correct option: Assertion: The magnetic force experienced by moving charge will be zero if the direction of the velocity of charge is parallel to the applied magnetic field. Reason: Force on moving charge is independent of the direction of the applied magnetic field.
	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) Assertion is CORRECT, but the reason is INCORRECT.

Q.3	In the following question, an assertion and a reason are given. Choose the correct option: Assertion (A): In a motion picture, usually 24 frames are projected every second over the whole length of the film. Reason (R): An image formed on the retina of eye persists for about 1/15s after the removal of the stimulus.
	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	Hydrogen chloride and SO2 are the side products in the reaction of ethanol and thionyl chloride. Which of the following is the main product in this reaction?
	a) C2H5OC2H5		b) C2H6
	c) CH5Cl		d) C2H5Cl

Q.5	Consider the following balanced equation and identify a, b, c and d: aFe2O3 + bH2 → cFe + dH2O
	a) a-1, b-1, c-2, d-3		b) a-1, b-1, c-1, d-1
	c) a-1, b-3, c-2, d-3		d) a-1, b-2, c-2, d-3

Q.6	Which among the following cannot be used for the preparation of the halogen acid?
	a) 2KBr + H2SO4 (conc.) → K2SO4 + 2HBr		b) 2NaCl + H2SO4 (conc.) → NaHSO4 + HCl
	c) NaHSO4 + NaCl (conc.) → Na2SO4 + HCl		d) CaF2 + H2SO4 (conc.) → CaSO4 + 2HF

Q.7	In the following question, an assertion and a reason are given. Choose the correct option: Assertion: Atomic size decreases as we move from left to right in a period. Reason: In a period from left to right, the number of valence electrons in the same shell increases.
	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) Assertion is CORRECT, but reason is INCORRECT.

Q.8	Read the following statements and choose the correct option: Statement 1: During vigorous physical exercise, lactic acid is formed inside the muscle cell because there is an excess of carbon dioxide. Statement 2: Villi present on the internal wall of intestine help in the digestion of carbohydrates.
	a) Statement 1 is correct and statement 2 is incorrect		b) Statement 1 is incorrect and statement 2 is correct
	c) Both the statements are correct		d) Both the statements are incorrect

Q.9	Four equal resistances are connected as shown in figure. Find the resistance measured across AB:
	a) 3R/4		b) 3 R
	c) 4 R		d) 4/3R

Q.10	Which of the following is employed for harnessing the potential energy of surface water stored in a reservoir?
	a) Thermal power plant		b) Hydroelectric power plant
	c) Tidal power plant		d) Nuclear power plant

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.