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	Fill in the blank: When a ray of light falls on a transparent glass plate, a part of it is reflected and a part is refracted. The reflected and refracted rays can be perpendicular to each other for ____________.
	a) angle of incidence equal to 90o		b) angle of incidence equal to zero
	c) only one angle of incidence		d) more than one angle of incidence

Q.2	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.3	A convex mirror of focal length f produces an image 1/nth of the size of the object. Calculate the distance of the object from the mirror:
	a) (n + 1)/n f		b) (n + 1)f
	c) (n -1)f		d) (n -1/n)f

Q.4	In the following question, an assertion and a reason are given. Choose the correct option: Assertion (A): In any food chain, the number of organisms in any trophic level should always be less than that in its previous trophic level. Reason (R): Only 10 percent of total energy present in a trophic level is transferred to the next trophic level in any food chain.
	a) Both A and R are true and R is the correct explanation for A		b) Both A and R are true, but R is not the correct explanation for A
	c) A is true and R is false		d) A is false and R is true

Q.5	In the following question, an assertion and a reason are given. Choose the correct option: Assertion: According to Döbereiner's, a group of three similar elements arranged in their increasing atomic weights show that the atomic weight of middle is equal to the arithmetic mean of the other two elements. Reason: Atomic weight is equal to one-twelfth of the mass of a carbon atom.
	a) Both assertion and reason are correct and reason is the correct explanation of the assertion.		b) Both assertion and reason are correct, but reason is not the correct explanation of the assertion.
	c) Both assertion and reason are incorrect.		d) Both assertion and reason are correct.

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	In the following question, an assertion and a reason are given. Choose the correct option: Assertion: In a simple electric circuit, the positive terminal of the battery is a point of lowest potential. Reason: The electronic current flow in a circuit is from a point of highest potential to a point of lowest potential.
	a) Both assertion and reason are correct and reason is the correct explanation of the assertion.		b) Both assertion and reason are correct, but reason is not the correct explanation of the assertion.
	c) Both assertion and reason are incorrect.		d) Both assertion and reason are correct.

Q.8	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)

Q.9	Choose the correct option and complete the following sentence: An electric motor consists of ____________. I. rectangular coil of insulated copper wire II. two poles of a magnetic field III. split rings IV. conducting brushes
	a) I and II		b) I, II and III
	c) I, II, III and IV		d) None of these

Q.10	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

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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.