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	What happens when 1 mole of ethyne undergoes complete combustion?
	a) 2 moles of carbon monoxide and half-mole of water are formed		b) 4 mole of carbon dioxide and 1 mole of water are formed
	c) 2 mole of carbon dioxide and 1 mole of water are formed		d) 2 moles of carbon dioxide and 2 moles of water are formed

Q.2	Length and diameters of four wires of same material are given below. The resistance of which of the following wires will be minimum?
	a) L and D		b) 2 L and D
	c) (L/2) and 2D		d) 2 L and (D/2)

Q.3	Which of the following equations is not an example of displacement reaction?
	a) 2Al + Fe2O3 → Al2O3 + 2Fe		b) Ca + Cl2 → CaCl2
	c) 2Kl + Cl2 → 2KCl + l2		d) 2Na + 2H2O → 2NaOH + H2

Q.4	In the following question, an assertion and a reason are given. Choose the correct option: Assertion (A): A person, who has suffered from smallpox can be recommended for providing nursing care to the victims of smallpox than the person who hadn't suffered from smallpox. Reason (R): The immune system of the person who had suffered from smallpox remembers the microbes causing smallpox and responds vigorously on the next encounter.
	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) Both (A) and (R) are false

Q.5	Which of the following statements is correct regarding the grafting process?
	a) The rooted plant that is cut in a slanting manner is known as a scion.		b) The part of a stem that is cut in a slanting way is called stock.
	c) This is a natural method of vegetative reproduction.		d) Grafting is practised for mango and citrus plants.

Q.6	Match List I (Vegetative propagation type) with List II (Example): Column I (Vegetative propagation type) Column II (Example) 1.     Tuber eye a.     Garlic 2.     Bulb b.     Rose 3.     Cutting c.      Potato 4.     Plantlets at margins of leaves d.     Bryophyllum
	a) 1 – c, 2 – a, 3 – d, 4 – b		b) 1 – c, 2 – a, 3 – b, 4 – d
	c) 1 – a, 2 – b, 3 – d, 4 – c		d) 1 – b, 2 – d, 3 – c, 4 – a

Q.7	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.8	Choose the correct option and complete the following sentence: Sexual reproduction causes genetic variation because of _____________. blending of genes chromosomal changes shuffling of genes
	a) Only 1		b) Only 2
	c) Only 3		d) All of the above

Q.9	Identify the phenomenon by which a new set of the population is formed from the change in the frequency of some genes:
	a) Genetic drift		b) Organic evolution
	c) Variations		d) Speciation

Q.10	Which of the following metals cannot be refined by electrolytic refining? (i) Au (ii) Cu (iii) Na (iv) K
	a) (i) and (ii)		b) (i) and (iii)
	c) (ii) and (iii)		d) (iii) and (iv)

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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.