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.

>>> Join CREST Olympiads WhatsApp Channel for latest updates. CREST Science Olympiad Previous Year Paper PDF for Class 10:

If your web browser doesn't have a PDF Plugin. Instead you can Click here to download the 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	Consider the following statement: 1. A person with myopia can see distant objects distinctly but cannot see nearby objects clearly. 2. A person with hypermetropia cannot see distant objects clearly. 3. A person with presbyopia can see nearby objects without corrective glasses. Which of the statement given above is/are not correct?
	a) 1, 2 and 3		b) 1 and 2 only
	c) 2 and 3 only		d) 3 only

Q.2	The ciliary muscles can change the focal length of the eye lens. Find the ratio of the focal length of the eye lens when it is focused on two different objects, one at a distance of 2 m and the other at a distance of 1 m. The diameter of the normal eye is 2.5 cm.
	a) 82 : 81		b) 81 : 82
	c) 78 : 81		d) 81 : 78

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	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.5	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.6	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.7	Which among the following cannot be used for the preparation of the halogen acid?
	a) 2KBr + H2SO4 (conc.) → K2SO4 + 2HBr		b) 2NaCl + H2SO4 (conc.) → NaHSO4 + HCl
	c) NaHSO4 + NaCl (conc.) → Na2SO4 + HCl		d) CaF2 + H2SO4 (conc.) → CaSO4 + 2HF

Q.8	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.9	The magnetic field intensity of an electromagnet depends on which of the following parameter? I. Number of turns of the solenoid II. Nature of the core substance III. The magnitude of electric current IV. The shape of the core
	a) I and III		b) II and IV
	c) I, II and III		d) I, II, III and IV

Q.10	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)

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.