CREST Science Olympiad Class 10 Previous Year Papers

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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

Q.1

Q.2

Q.3

Q.4

Q.5

Q.6

Q.7

Q.8

Q.9

Q.10

Q.1	In the following question, an assertion and the reason are given. Choose the correct option: Assertion (A): In the periodic table of chemical elements, electron affinity is always found to increase from top to bottom in a group. Reason (R): In a group, the atomic radii generally increase from top to bottom.
	a) Both A and R are true and R is the correct explanation of A		b) Both A and R are true, but R is not the correct explanation of A
	c) A is true, but R is false		d) A is false, but R is true

Q.2	Olivia measured the focal length of a convex lens by focusing a parallel beam of yellow, violet and green colours at the principal axis. If fy, fv and fg are the respective focal lengths, then which among the following is the correct relation?
	a) fv = fy = fg		b) fv < fg < fy
	c) fv > fy > fg		d) fv > fg > fy

Q.3	It is possible to measure the passage of 50 electrons per sec with a certain sensitive device. This corresponds to a current of:
	a) 8 x 10-18 A		b) 1.6 x 10-20 A
	c) 8 x 10-20 A		d) 1.6 x 10-19 A

Q.4	Identify the reaction which takes place at the anode when an aqueous solution of CuSO4 is electrolysed using platinum as anode:
	a) Hydroxyl ions get reduced to hydrogen.		b) Hydroxyl ions get oxidised to oxygen.
	c) Copper metal gets oxidised.		d) Copper ions gets reduced.

Q.5	Match the entries of Column I with those of Column II:   Column I   Column II 1.     Stomata a.     Anaerobic respiration 2.     Mangrove trees b.     Intake of CO2 3.     Wood stem c.      Pneumatophores 4.     Yeast d.     Lenticels
	a) 1 – b, 2 – c, 3 – d, 4 – a		b) 1 – b, 2 – a, 3 – d, 4 – c
	c) 1 – d, 2 – a, 3 – c, 4 – b		d) 1 – a, 2 – b, 3 – c, 4 – d

Q.6	Which environmental hazard is not contributed by the combustion of fossil fuels?
	a) Acid rain		b) Greenhouse effect
	c) Destruction of wildlife habitat		d) Air pollution

Q.7	Match column I with column II and select the correct answer using the codes given below:   Column I   Column II 1.     Element with a smallest atomic radius a.     Ca 2.     Element with the largest atomic radius b.     F 3.     Element with the highest electron affinity c.     Cl
	a) 1 – c, 2 – b, 3 – a		b) 1 – b, 2 – a, 3 – c
	c) 1 – a, 2 – b, 3 – c		d) 1 – a, 2 – c, 3 – b

Q.8	Fill in the blank: Neutral water with pH of about 7 becomes slightly acidic when aerated. This is because ________________.
	a) oxygen from the air is dissolved in the water which makes the water acidic		b) dirt, which gets contaminated with the water during aeration makes the water acidic
	c) ultraviolet radiation dissociates water molecules and makes water acidic		d) it absorbs carbon dioxide from the air

Q.9	When a person walking in bright sunlight enters a dark room, he is not able to see clearly for a little while. Identify the correct reason for the above statement:
	a) It is because the eye muscles cannot immediately adjust the focal length of the eye lens.		b) It is because the retina retains the bright image for some time and becomes momentarily insensitive.
	c) It is because the iris is unable to contract the pupil immediately.		d) It is because the iris is unable to dilate the pupil immediately.

Q.10	Consider the following reaction: 2CaO + C → CaC2 + 2CO 2CaC2 + 2H2O → X + Y If X is involved in the neutralisation reaction with acid, then Y may be:
	a) CH4		b) C2H2
	c) Ca(OH)2		d) CaH2

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Students can find the most recent CREST Science Olympiad previous year paper pdf for class 10 on this page. The pdf is easily downloadable & answer key for all the questions is also provided on the last page.

CREST Science Olympiad previous year papers become quite useful while preparing for the CREST Science Olympiad exam. Below are some advantages of referring to the previous year papers -

1. Students get to understand the types of questions that come in the CREST Science Olympiad exam.
2. Practicing previous years’ papers help students to get to know their strengths and weaknesses.
3. Students become capable of effectively managing their time in the exam by practicing previous years' papers multiple times.

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.