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	Refer to the given diagram and select the incorrect option regarding X and Y:
	a) X could be cow dung whereas Y could be chemicals from paint industries.		b) X could be used syringe whereas Y could be vegetable peels.
	c) X is disposed off by the process called incineration whereas Y is disposed off by compositing.		d) X is converted into ashes and clinkers whereas Y is converted into humus.

Q.2	Fill in the blank: When Ca(NO3)2 is heated, it gives CaO, NO2(g) and O2(g). The correct number of moles of Ca(NO3)2, CaO, NO2(g) and O2(g) are present in the reaction are respectively _________.
	a) 2, 1, 3, 2		b) 2, 2, 4, 1
	c) 2, 2, 2, 1		d) 1, 2, 4, 1

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	An air bubble in a glass slab (μ = 3/2) is 6 cm deep when viewed from one face and 3 cm deep when viewed from the opposite face. Determine the thickness of the slab:
	a) 9 cm		b) 13.5 cm
	c) 15 cm		d) 18 cm

Q.5	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.6	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.7	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.8	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.9	Study the circuit given below and determine the effective resistance (in Ω) between A and B:
	a) 3R/5		b) 5R/3
	c) 3R/7		d) 7R/3

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.