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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Open CREST Science Olympiad Class 10 Previous Year Paper (PDF)

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	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.2	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.3	26 g of an alloy of copper and zinc reacts with H2SO4 releasing 4.48 L of H2 at STP. What is the percentage of zinc in the alloy?
	a) 10.2%		b) 76.5%
	c) 25.5%		d) 48.8%

Q.4	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.5	Consider the following statements: If the sperm and ovum are fertilised in the uterus, then the baby born as a result is known as a test tube baby. The rupture of Graafian follicles to produce ovum is called capacitation. Tubectomy is a surgical procedure that prevents the entry of sperms into the uterus. The involvement of two organisms of the same species to produce a new offspring is known as asexual reproduction.  Which of the above statement(s) is/are incorrect?
	a) 1 only		b) 2 only
	c) 2 and 3 only		d) 1, 2, 3 and 4

Q.6	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. Then 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.7	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.8	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.9	What happens when aqueous sodium carbonate (Na2CO3) reacts with HCl(aq)?
	a) NaOH, H2(g) and CO2(g) is formed		b) NaCl, H2O and CO2(g) is formed
	c) NaHCO3, H2(g) and CO2(g) is formed		d) NaHCO3, HO2, (g) and CO2(g) is formed

Q.10	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

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.