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

Q.1

Q.2

Q.3

Q.4

Q.5

Q.6

Q.7

Q.8

Q.9

Q.10

Q.1	A concave mirror has a focal length of 15 cm. An object is initially placed 30 cm in front of the mirror and is then moved to 20 cm in front of it. Which change occurs in the image?
	a) It moves towards the mirror and becomes three times larger.		b) It moves away from the mirror and becomes three times larger.
	c) It moves towards the mirror and becomes one-third as large.		d) It moves away from the mirror and remains equal in size.

Q.2	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.3	In the following question, an assertion and a reason are given. Choose the correct option: Assertion: Bending a wire increases the electrical resistance. Reason: Resistance of wire is inversely proportional to the length of the material.
	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.4	Two snapdragon plants with pink flowers were hybridized. The F1 plants produced red, pink, and white flowers in the proportion of 1 red, 2 pink, and 1 white. What could be the genotype of the two plants used for hybridization? (Red flower colour-RR white-rr)
	a) rr		b) Rr
	c) RR		d) Rr x RR

Q.5	Which of the following statements is incorrect?
	a) Sodium and potassium are soft and silvery white metals.		b) Sodium and potassium in the air get tarnished due to the formation of a layer of oxide or carbonate.
	c) Sodium and potassium burn in dry oxygen (excess) giving peroxides.		d) Sodium and potassium are kept under kerosene to avoid contact with air and moisture.

Q.6	The following are the ions obtained by the dissociation of different salts. Which of the following is not possible?
	a) Disodium potassium phosphate → Na+, K+, PO4-3		b) Sodium argentocyanide → Na+, Ag+, CN-
	c) Potash alum → K+, Al+3, SO4-2		d) Bleaching powder → Ca+2, Cl-, OCl-

Q.7	Two particles having charges q1 and q2 when kept at a certain distance, exert a force F on each other. If the distance between the two charges is reduced to half and the charge on each particle is doubled then the force exerted on each other would be:
	a) 2 F		b) 4 F
	c) 8 F		d) 16 F

Q.8	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: Across a period, nuclear charge increases while electrons are added to the same principal shell.
	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.9	A reactive metal (M) is treated with H2SO4(dil). The gas is evolved and is collected over the water as shown in the figure. What conclusion can be drawn from the above experiment?
	a) The gas evolved is hydrogen.		b) The gas evolved is lighter than air.
	c) The gas evolved is O2 and is lighter than air.		d) Both (a) and (b)

Q.10	When Peter rotated a plane mirror through an angle of 60o, the reflected ray turned through the angle 120o. What will happen to the size of the image during this rotation?
	a) Doubled		b) Halved
	c) Remains the same		d) Becomes infinite

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.