CREST Science Olympiad Class 10 Previous Year Papers

CREST Science Olympiad Previous Year Paper PDF for Class 10:

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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

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


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?


In the following question, an assertion and a reason are given. Choose the correct option:

Assertion: In a simple electric circuit, the positive terminal of the battery is a point of lowest potential.

Reason: The electronic current flow in a circuit is from a point of highest potential to a point of lowest potential.


Which of the following statements is correct regarding grafting process?


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.


Match the entries of Column I with those of Column II:

Column I Column II
A. Stomata i. Anaerobic respiration
B. Mangrove trees ii. Intake of CO2
C. Wood stem iii. Pneumatophores
D. Yeast iv. Lenticels


Match List I (Vegetative propagation type) with List II (Example) and select the correct answer using the codes given below the list:

List I (Vegetative propagation type) List II (Example)
A. Tuber eye 1. Garlic
B. Bulb 2. Rose
C. Cutting 3. Potato
D. Plantlets at margins of leaves 4. Bryophyllum


Refer to the given diagram and select the incorrect option regarding X and Y:


Fill in the blank:

Neutral water with pH about 7 becomes slightly acidic when aerated. This is because ________________.


Choose the correct option and complete the following sentence:

An electric motor consists of ____________.
I. rectangular coil of insulated copper wire
II. two poles of a magnetic field
III. split rings
IV. conducting brushes


Identify the phenomenon by which a new set of the population is formed from the change in the frequency of some genes:

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