CREST Science Olympiad Class 10 Sample 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

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

Q.1

Identify the reaction which takes place at the anode when an aqueous solution of CuSO4 is electrolysed using platinum as anode:

Q.2

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

Q.3

Which of the following metals can not be refined by electrolytic refining?

(i) Au (ii) Cu (iii) Na (iv) K

Q.4

Which of the following equations is not an example of displacement reaction?

Q.5

Arrange the following in the increasing order of ease of oxidation:

(A) SO4-2         (B) F-1            (C) Br-1        (D) OH-

Q.6

Choose the correct option and complete the following sentence:

Sexual reproduction causes genetic variation because of _____________.

  1. blending of genes
  2. chromosomal changes
  3. shuffling of genes

Q.7

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.

Q.8

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.

Q.9

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.

Q.10

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

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Sample PDF of CREST Science Olympiad for Class 10:


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Answers to Sample Questions from CREST Olympiads:

Q.1bQ.2aQ.3dQ.4bQ.5dQ.6dQ.7aQ.8dQ.9aQ.10a

Answers to Sample Questions from CREST Olympiads:

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

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