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 correct sequence of fractions obtained when petroleum is subjected to fractional distillation:

(1) Lubricating oil
(2) Petrol
(3) Petroleum ether
(4) Diesel oil

Q.2

Fill in the blank:

When Ca(NO3)2 is heated, it gives CaO, NO2(g) and ) O2(g). The correct number of moles of Ca(NO3)2, CaO, NO2(g) and O2(g) are present in the reaction are respectively _________.

Q.3

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

Q.4

Consider the following reaction:

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

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

Q.5

Length and diameters of four wires of same material are given below. The resistance of which of the following wires will be minimum?

Q.6

Fill in the blank:

When a ray of light falls on a transparent glass plate, a part of it is reflected and a part is refracted. The reflected and refracted rays can be perpendicular to each other for ____________.

Q.7

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

Q.8

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.

Q.9

Which of the following is obtained in its pure form by the reaction of sugar and sulphuric acid?

Q.10

Fill in the blank:

Bronze is often used to make statues and medals whereas brass is used in making utensils, scientific apparatus and cartridges. Both brass and bronze are copper-containing alloys, yet they differ in their chemical composition for additionally containing ___________.

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Answers to Sample Questions from CREST Olympiads:

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

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Answers to Sample Questions from CREST Olympiads:

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

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