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	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

Q.2	Arrange the following compounds in the decreasing order of covalency of the non-metallic elements: A) PCl5 B) NCl3 C) CH4 D) SO3 E) Cl2O7
	a) EDACB		b) BCADE
	c) ECADB		d) BDACE

Q.3	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.4	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.5	A myopic person has a power of -1.25 dioptre. What is the focal length and nature of his lens?
	a) 50 cm and convex lens		b) 80 cm and convex lens
	c) 50 cm and concave lens		d) 80 cm and concave lens

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	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.8	Which of the following shows the correct order for ionization energy?
	a) Be > B > C > N > O		b) N > O > C > Be > B
	c) B < Be < C < N < O		d) B < Be < N < C < O

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	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

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.