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	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

Q.2	The ciliary muscles can change the focal length of the eye lens. Find the ratio of the focal length of the eye lens when it is focused on two different objects, one at a distance of 2 m and the other at a distance of 1 m. The diameter of the normal eye is 2.5 cm.
	a) 82 : 81		b) 81 : 82
	c) 78 : 81		d) 81 : 78

Q.3	Which one among the following statements is correct?
	a) All arteries carry oxygenated blood		b) All veins carry oxygenated blood
	c) Except the pulmonary artery, all other arteries carry oxygenated blood		d) Except the pulmonary vein, all other veins carry oxygenated blood

Q.4	Arrange the following in the increasing order of relative sweetness: (A) Glucose            (B) Maltose            (C) Fructose              (D) Lactose
	a) ACBD		b) DBAC
	c) ACDB		d) CADB

Q.5	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.6	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.7	Lily connected a bulb to a battery through a resistor. What will happen to the brightness of the bulb, if another resistor is connected in parallel to the first resistor?
	a) Increases		b) Remains the same
	c) Decreases		d) Increases or decreases depending upon the resistance of the filament

Q.8	In the following question, an assertion and a reason are given. Choose the correct option: Assertion: Graphite is slippery to touch. Reason: The various layers of carbon atoms in graphite are held together by weak van der Waal's forces.
	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.9	Concave and convex lenses are placed touching each other. The ratio of magnitudes of their powers is 2:3. The focal length of the system is 30 cm. hen the focal lengths of individual lenses are ________.
	a) -75 cm, 50 cm		b) -15 cm, 10 cm
	c) - 50 cm, 100 cm		d) 40 cm, -200 cm

Q.10	The reaction of KMnO4 and HCl results in:
	a) Oxidation of Mn in KMnO4 and production of Cl2		b) Reduction of Mn in KMnO4 and production of Cl2
	c) Oxidation of Mn in KMnO4 and production of H2		d) Reduction of Mn in KMnO4 and production of H2

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.