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	Two snapdragon plants with pink flower were hybridized. The F1 plants produced red, pink, and white flowers in the proportion of 1 red, 2 pink, and 1 white. What could be the genotype of the two plants used for hybridization? (Red flower colour-RR white-rr)
	a) rr		b) Rr
	c) RR		d) RRRR

Q.2	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

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	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.5	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.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	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.8	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. hen 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.9	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.10	Consider the following statements and choose the correct option: I. RNA is double-stranded. II. RNA can be genetic or non-genetic. III. Viruses have RNA as a genetic material. IV. In RNA, uracil is present in place of thymine.
	a) Only I is incorrect		b) I and III are incorrect
	c) I, II and III are incorrect		d) II and III are incorrect

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.