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

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Q.3

Q.4

Q.5

Q.6

Q.7

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Q.9

Q.10

Q.1	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

Q.2	In the following question, an assertion and a reason are given. Choose the correct option: Assertion (A): Children necessarily possess the same blood group as either of the parents. Reason (R): The gene corresponding to the blood group has three alleles.
	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.3	Which of the following would stop evolution by natural selection from occurring?
	a) If humans became extinct because of an epidemic disease.		b) If a thermonuclear war killed most living organisms and changed the environment drastically.
	c) If ozone depletion led to increased ultraviolet radiation, which may cause many new mutations.		d) If all individuals in a population were genetically identical, and there was no genetic recombination, sexual reproduction, or mutation.

Q.4	When SO2 is passed through a solution of K2Cr2O7 turns green. Which of the following correctly shows the change in the oxidation state of chromium and sulphur?
	a) +3 to +6 and +4 to +2 respectively		b) +6 to +3 and +4 to +6 respectively
	c) +4 to +6 and +4 to -2 respectively		d) No change in 0 states

Q.5	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.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	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.8	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.9	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.10	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

Your Score: 0/10

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.