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.2

Q.3

Q.4

Q.5

Q.6

Q.7

Q.8

Q.9

Q.10

Q.1	Study the reaction given: C2H5ONa + A → C2H5-O-CH3 + NaBr Identify which of the following reactions produces 'A':
	a) Ethane with HBr		b) Methyl alcohol with PBr5
	c) Ethyl alcohol with PBr3		d) Ethane with excess of bromine in the presence of sunlight

Q.2	Which of the following statements is/are true? I. The lattice structure of diamond and graphite are different. II. Graphite is an impure form of carbon while diamond is pure form. III. Graphite conducts electricity while diamond does not. IV. Graphite has a lower density than diamond.
	a) Only II		b) I and II
	c) I, II and III		d) I, III and IV

Q.3	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.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	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.6	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

Q.7	A student connects a coil of wire with a sensitive galvanometer as shown in figure. He will observe the deflection in the galvanometer if bar magnet is:
	a) placed near one of the faces of the coil and parallel to the axis of the coil		b) moved towards or away from the coil parallel to the axis of the coil
	c) placed inside the coil		d) placed near one of the faces of the coil and perpendicular to the axis of the coil

Q.8	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.9	Consider the following statement: 1. A person with myopia can see distant objects distinctly but cannot see nearby objects clearly. 2. A person with hypermetropia cannot see distant objects clearly. 3. A person with presbyopia can see nearby objects without corrective glasses. Which of the statement given above is/are not correct?
	a) 1, 2 and 3		b) 1 and 2 only
	c) 2 and 3 only		d) 3 only

Q.10	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-

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.