CREST Science Olympiad Class 10 Sample 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

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


Fill in the blank:

An electric current through a horizontal metal wire flows in East to West direction, the direction of the magnetic field at a point directly above it is from ___________.


When current flows in a long straight solenoid, north and south poles are created at the two ends. Which of the following statements is/are correct?


Which environmental hazard is not contributed by the combustion of fossil fuels?


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?


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

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


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:


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?


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.


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


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.

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Answers to Sample Questions from CREST Olympiads:


Answers to Sample Questions from CREST Olympiads:

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