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	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.2	Fill in the blank: An electric kettle has two thermal coils A and B. When current is passed through A, water in the kettle boils in 6 minutes. When current is passed through B, the same volume of water in the kettle boil in 8 minutes. If both A and B are joined in series and current is passed, water will boil in _______________.
	a) 14 minutes		b) 7 minutes
	c) 24 minutes		d) 28 minutes

Q.3	Fill in the blank: White light while passing through a glass prism breaks up into light of different colours, because __________.
	a) the refractive index of glass is different for different colours of light		b) glass prism absorbs white light and emits lights of several colours in different directions
	c) of total internal reflection of white light on surfaces of the prism		d) of the interference colours inside the prism

Q.4	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.5	Three elements X, Y and Z belong to the same group of the modern periodic table such that the difference in atomic weight of X and Y is equal to the difference in atomic weight of Y and Z. The sum of atomic weights of elements X and Z is 46 and that of X and Y is 30. Identify the elements X, Y and Z:
	a) X-Be, Y-Mg, Z-Ca		b) X-B, Y-C, Z-N
	c) X-F, Y-Cl, Z-Br		d) X-Li, Y-Na, Z-K

Q.6	A solution of sodium carbonate is prepared by dissolving 0.53 g in 100 ml of the solution. To this 200 ml of 0.001 M NaOH is added. What is the pH of the resulting mixture?
	a) 13		b) 12.53
	c) 15		d) 16. 43

Q.7	Which of the following happens when a monochromatic ray of light travels from a medium of refractive index n1 to a medium of refractive index n2 (n2 > n1)?
	a) Speed increases by a factor n2/n1		b) Speed decreases by a factor n2/n1
	c) Frequency decreases by a factor n2/n1		d) Wavelength increases by a factor n2/n1

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	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.10	The Red Data Books published by the International Union for Conservation of Nature and Natural Resources (IUCN) contains lists of which of the following?
	a) Endemic plant and animal species present in the biodiversity hot spots.		b) Threatened plant and animal species
	c) Protected sites for conservation of nature and natural resources in various countries.		d) None of the above

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.