CREST Science Olympiad Class 8 Previous Year Papers

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Syllabus:

Section 1: Crop Production and Management, Microorganisms, Synthetic Fibres and Plastics, Metals and Non-metals, Coal and Petroleum, Combustion and Flame, Conservation of Plants and Animals, Cell, Reproduction and Endocrine System, Force and Pressure, Friction, Sound, Chemical Effects of Electric Current, Some Natural Phenomena, Light, Stars and the Solar System, Pollution of Air and Water.

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.1	During a lab experiment, Mark used a dye to stain a cell to observe its various structures. Which cellular structure would likely appear colorless or transparent due to this staining process?
	a) Nucleus		b) Mitochondria
	c) Cell membrane		d) Endoplasmic reticulum

Q.2	Which of the following can lead to menstruation in a 21-year-old woman after ovulation? A. Sperms not available for fertilisation B. Oviducts blocked C. Sperms available for fertilisation D. Oviducts not blocked
	a) A and B		b) B and C
	c) A and D		d) C and D

Q.3	Four classmates were having a discussion about the correct way for sowing seeds. This is what they said: Richard: Seeds should be sown at right intervals. Susan: Seeds should be sown at the right depth. David: Seeds should be sown in dry soil. Jacob: Seeds should not be sown in highly wet soil. Which of them was/were incorrect?
	a) Only Jacob		b) Only David
	c) Both Susan and Richard		d) Both David and Susan

Q.4	Susan was walking on ice, her mother advised her to take smaller steps to avoid slipping. Which of the following could be the reason for the smaller steps?
	a) The frictional force of ice is large.		b) Normal reaction is larger.
	c) The frictional force of ice is small.		d) Normal reaction is smaller.

Q.5	Consider the following statements and choose the correct option: Statement 1: The ignition temperature of white phosphorus is nearly equivalent to the temperature of the earth. Statement 2: Combustion of fuel by motor vehicles is an example of spontaneous combustion.
	a) Statement 1 is correct and statement 2 is incorrect		b) Statement 1 is incorrect and statement 2 is correct
	c) Both the statements are correct		d) Both the statements are incorrect

Q.6	James noticed that a flame produced by burning wood is orange-yellow, while a Bunsen burner flame is blue. What is the primary reason for this difference in flame colour?
	a) Wood releases different gases, causing a coloured flame.		b) The temperature of the flame determines its colour.
	c) The presence of impurities in wood affects the flame colour.		d) The combustion of different materials produces varying flame colours.

Q.7	An echo returned in 3 s. What is the distance of the reflecting surface from the source, given that the speed of sound is 342 m s-1?
	a) 520 m		b) 515 m
	c) 530 m		d) 513 m

Q.8	The pressure at a certain depth in river water is p1 and at the same depth the pressure in seawater is p2. Given that the density of seawater is greater than that of river water. Identify the correct relation between p1 and p2:
	a) p1 = p2		b) p1 > p2
	c) p1 < p2		d) p1 - p2 = Atmospheric pressure

Q.9	In the given question, an assertion and a reason are given. Choose the correct option: Assertion: The temperature increases inside the fractionating column on going from the bottom to the top. Reason: The column is not heated at the bottom.
	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 the assertion.
	c) Assertion is correct, but reason is incorrect.		d) Both assertion and reason are incorrect.

Q.10	Different microorganisms taking part in the nitrogen cycle are: (i) Rhizobium in roots (ii) Ammonifying bacteria (iii) Nitrifying bacteria (iv) Denitrifying bacteria Which of them strictly work under anaerobic conditions?
	a) Only iv		b) i and iv
	c) i, ii and iv		d) ii and iv

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Students can download the CREST Science Olympiad previous year paper pdf for class 8 from this page. Each question in the paper carries 1 mark. The answer key for all the questions is also provided on the last page.

One of the most significant advantages of solving the past years’ papers is that it helps students improve their time management skills, strengthens their understanding of concepts and aids them in applying the concepts they have mastered. Also, solving previous years’ papers a few days before the exam can help students to revise the concepts quickly. Therefore, students must refer to previous years' papers before appearing for the final exam as many advantages are associated with it.

Additional Preparation Resources

Students can also refer to the following resources to level up their CREST Science Olympiad (CSO) exam preparation for class 8 -

1. CREST Science Worksheets Package for class 8 - 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 8 - 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 8 for free.

Note: Don’t forget to download the CREST Science Olympiad past year paper pdf for class 8.