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

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Q.10

Q.1	Consider the following statements and choose the correct option: I. Photolysis of water involves the breakdown of water by light. II. The specific function of light energy in the process of photosynthesis is to activate chlorophyll. III. One of the by-product of photosynthesis is oxygen.
	a) Only I is correct		b) Only II is correct
	c) Only III is correct		d) I, II and III are correct

Q.2	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

Q.3	Four equal resistances are connected as shown in figure. Find the resistance measured across AB:
	a) 3R/4		b) 3 R
	c) 4 R		d) 4/3R

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	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.6	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.7	Three resistors, each of resistance 7.5 Ω are connected in parallel. Five resistors, each of resistance 8 Ω are connected in parallel. Another three resistors, each of resistance 6 Ω are in parallel. If these three parallel combinations are in series, find the effective resistance of the circuit:
	a) 2.5 Ω		b) 2 Ω
	c) 6.1 Ω		d) 1.8 Ω

Q.8	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.9	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.10	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.

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.