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Olympiad Test: Physical & Chemical Changes


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20 Questions MCQ Test General Science(Prelims) by IRS Divey Sethi | Olympiad Test: Physical & Chemical Changes

Olympiad Test: Physical & Chemical Changes for UPSC 2022 is part of General Science(Prelims) by IRS Divey Sethi preparation. The Olympiad Test: Physical & Chemical Changes questions and answers have been prepared according to the UPSC exam syllabus.The Olympiad Test: Physical & Chemical Changes MCQs are made for UPSC 2022 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Olympiad Test: Physical & Chemical Changes below.
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Olympiad Test: Physical & Chemical Changes - Question 1

In a chemical change

Detailed Solution for Olympiad Test: Physical & Chemical Changes - Question 1

Burning of candle wick is an example of chemical change as wick gets burnt and new substance is formed with new property.

Olympiad Test: Physical & Chemical Changes - Question 2

A substance which is burned to produce heat and light is known as

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On Combustion, fuel is the substance which produces heat and light.

Olympiad Test: Physical & Chemical Changes - Question 3

When water freezes it undergoes a

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When water freezes it undergoes a physical change and no new substance is formed.

Olympiad Test: Physical & Chemical Changes - Question 4

Which of the following is an example of physical change?

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Boiling of water is a physical change as water vapour can be changed into water again by cooling.

Olympiad Test: Physical & Chemical Changes - Question 5

What property stays the same during physical and chemical changes?

Detailed Solution for Olympiad Test: Physical & Chemical Changes - Question 5

Since the law of conservation of mass is valid under all circumstances, hence, mass always remains the same, whether a substance undergoes physical change or chemical change.

Olympiad Test: Physical & Chemical Changes - Question 6

Plastic industry was started when a chemist made a

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Then in 1909, a Belgian chemist named Leo Baekeland created the first entirely synthetic plastic—and it would revolutionize the way many consumer goods were manufactured. Baekeland called his plastic “Bakelite.”

Olympiad Test: Physical & Chemical Changes - Question 7

Which of the following is a chemical change?

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Rusting of iron is a chemical change as rust is a new substance having new properties unlike the iron.

Olympiad Test: Physical & Chemical Changes - Question 8

Crystals of copper sulphate are prepared by the method of

Detailed Solution for Olympiad Test: Physical & Chemical Changes - Question 8

D is the correct option.Crystallization is the process by which we can obtain crystals of copper sulphate. In this process, a few drops of dilute sulphuric acid is added to water. The water is then boiled & as it starts boiling, copper sulphate powder is added with stirring. The powder must be added on till the solution becomes saturated.

Olympiad Test: Physical & Chemical Changes - Question 9

Chemical change are characterised by

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Chemical changes are characterised by formation of new substance having new properties

Olympiad Test: Physical & Chemical Changes - Question 10

The product formed by dissolving a substance into another is called

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The product formed by dissolving a substance into another is called a solution. Solution is a mixture.

Olympiad Test: Physical & Chemical Changes - Question 11

Rusting of iron is a slow change but burning of petrol is a

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Rusting of iron is slow change as it takes few days on the other hand burning of petrol is a fast change as it takes less than a second.

Olympiad Test: Physical & Chemical Changes - Question 12

Ripening of fruit is a

Detailed Solution for Olympiad Test: Physical & Chemical Changes - Question 12

Ripening of fruit is a slow change as it takes time. Ripening of fruit is also desirable as we want to do show.

Olympiad Test: Physical & Chemical Changes - Question 13

During chemical changes, ________________ change may not take place.

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During chemical changes, change in colour, heat or temperature may takes place but not always the size and shape.

Olympiad Test: Physical & Chemical Changes - Question 14

Electric wires or telephone wire became tight during winter and sag a little during summers because metal

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Metal wires expand on heating and contract on cooling. The electric wires become tight during winter due to expansion and tight during winter due to contraction.

Olympiad Test: Physical & Chemical Changes - Question 15

The process of converting gas into liquid is called

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The process of converting gas into liquid is called condensation. Condensation is a physical change.

Olympiad Test: Physical & Chemical Changes - Question 16

The chemical name of Baking soda is

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The chemical name of Baking soda is Sodium hydrogen carbonates, which is basic in nature.

Olympiad Test: Physical & Chemical Changes - Question 17

Air is a

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Air is a mixture of gases like nitrogen, oxygen and carbon dioxide along with other gases and other particles.

Olympiad Test: Physical & Chemical Changes - Question 18

Tearing of paper in small pieces is an example of

Detailed Solution for Olympiad Test: Physical & Chemical Changes - Question 18

Tearing of paper in small piece is an example of physical change as no new substance is formed and properties remain same.

Olympiad Test: Physical & Chemical Changes - Question 19

Magnesium ribbon burns with

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Magnesium ribbon burns with brilliant white light to produce magnesium oxide.

Olympiad Test: Physical & Chemical Changes - Question 20

Which of the following is a physical change?

Detailed Solution for Olympiad Test: Physical & Chemical Changes - Question 20

Melting of an ice cube is physical change.

Burning of candle is both physical and chemical change.

When the candle burns, the wax slowly melts which freezes after some time (Physical change).

Rusting is an oxidation reaction. The iron reacts with water and oxygen to form hydrated iron(III) oxide, which we see as rust.

When the magnesium metal burns it reacts with oxygen found in the air to form Magnesium Oxide, which is a compound.

Oxygen and magnesium come together in a chemical reaction to form this compound. After it burns, it forms a white powder of the magnesium oxide.

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