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

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Q.7

Q.8

Q.9

Q.10

Q.1	In the following question, an assertion and a reason are given. Choose the correct option: Assertion: The magnetic field produced by a current-carrying solenoid is independent of its length and cross-section area. Reason: The magnetic field inside the solenoid is uniform.
	a) Both assertion and reason are true and reason is the correct explanation of assertion		b) Both assertion and reason are true, but reason is not the correct explanation of assertion
	c) Assertion is true, but reason is false		d) Assertion is false, but reason is true

Q.2	Fill in the blank: Bronze is often used to make statues and medals whereas brass is used in making utensils, scientific apparatus and cartridges. Both brass and bronze are copper-containing alloys, yet they differ in their chemical composition for additionally containing ___________.
	a) zinc in brass and tin in bronze		b) nickel in brass and tin in bronze
	c) chromium in brass and nickel in bronze		d) iron in brass and nickel in bronze

Q.3	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.4	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.5	What volume of hydrogen gas at 273 K and 1 atm pressure will be consumed in obtaining 21.6 g of boron (At. mass: 10.8) from the reduction of BCl3 by hydrogen?
	a) 22.4 L		b) 44.8 L
	c) 67.2 L		d) 89.6 L

Q.6	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.7	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.8	The formation of the ozone hole in the Antarctic region has been a cause of concern. What could be the reason for the formation of this hole?
	a) Presence of prominent tropospheric turbulence and inflow of chlorofluorocarbons.		b) Absence of polar front and stratospheric clouds and inflow of methane and chlorofluorocarbons.
	c) Presence of prominent polar front and stratospheric clouds and inflow of chlorofluorocarbons.		d) The increased temperature at the polar region due to global warming.

Q.9	Which of the following equations is the summary of photosynthesis?
	a) 6CO2 + 12H2O → C6H12O6 + 6O2 + 6H2O		b) 6CO2 + H2O + Sunlight → C6H12O6 + O2 + 6H2O
	c) 6CO2 + 12H2O + Chlorophyll + Sunlight → C6H12O6 + 6O2 + 6H2O		d) 6CO2 + 12H2O + Chlorophyll → C6H12O6 + 6CO2 + 6H2O

Q.10	In the following question, an assertion and a reason are given. Choose the correct option: Assertion (A): Generally, the colour of indicators changes in a particular pH range. Reason (R): Indicators are weak acids or weak bases and exhibit different colours in molecular form and ionic form.
	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 and R is false		d) A is false and R is true

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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.