CREST Science Olympiad Class 10 Previous Year Papers

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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

Please visit for free preparation material.

Q.1 Q.2 Q.3 Q.4 Q.5 Q.6 Q.7 Q.8 Q.9 Q.10


Consider the following reaction:

2CaO + C → CaC2 + 2CO
2CaC2 + 2H2O → X + Y

If X is involved in the neutralisation reaction with acid, then Y may be:


It is possible to measure the passage of 50 electrons per sec with a certain sensitive device. This corresponds to a current of:


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.


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:


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?


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.


Match column I with column II and select the correct answer using the codes given below:


Column I


Column II


Element with a smallest atomic radius




Element with the largest atomic radius




Element with the highest electron affinity




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.


Which one of the following elements is alloyed with iron to produce steel which can resist high temperatures and also have high hardness and abrasion resistance?


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?

Your Score: 0/10

Answers to Previous Year Questions from CREST Olympiads:


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 -> Dashboard -> Additional Practice -> Buy & new users can visit
  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.

Answers to Previous Year Questions from CREST Olympiads:

Q.1 : b | Q.2 : a | Q.3 : d | Q.4 : b | Q.5 : b | Q.6 : b | Q.7 : b | Q.8 : a | Q.9 : b | Q.10 : c