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	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.2	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.3	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.4	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.5	Answer the following questions: Which of the following would not change the pH of 10 cm3 of dilute HCl when added to the acid? Identify the salt whose aqueous solution has the highest pH at the same temperatures. How many times a solution of pH = 2 is more acidic than a solution of pH = 6?
	a) 1 - 5 cm3 of pure water, 2 - NaCl, 3 - 1000		b) 1 - 20 cm3 of pure water, 2 - (NH4)2SO4, 3 - 400
	c) 1 - 10 cm3 of dil. HCl, 2 - CH3COONH4, 3 - 100		d) 1 - 20 cm3 of the same dil. HCl, 2 - K2CO3, 3 - 10,000

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	Match the following: Function of blood vessels Entering/leaving blood vessels (i) It carries the blood from the upper part of the body. (a) Hepatic artery (ii) It carries oxygenated blood to all the parts of the body. (b) Renal veins (iii) It supplies oxygenated blood to the liver from the aorta.  (c) Pulmonary artery (iv) It transports the blood from the kidney to the posterior vena cava for its purification. (d) Superior vena cava (v) It carries the deoxygenated blood from the right ventricle to the lungs for purification. (e) Aorta
	a) i-d, ii-e, iii-a, iv-c, v-b		b) i-c, ii-e, iii-a, iv-b, v-d
	c) i-d, ii-e, iii-a, iv-b, v-c		d) i-b, ii-e, iii-a, iv-d, v-c

Q.8	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.9	Read the following clues and identify X: Clue 1: X is embedded in the uterine wall. Clue 2: It secretes hormones such as oestrogen. Clue 3: It acts as a storage of glycogen.
	a) Zygote		b) Embryo's head
	c) Placenta		d) Eggs

Q.10	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

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.