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Test: Physical & Chemical Changes


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15 Questions MCQ Test Science & Technology for UPSC CSE | Test: Physical & Chemical Changes

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

Melting of ice is a

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Melting of ice is a physical change because no new substance is formed.

Test: Physical & Chemical Changes - Question 2

Which of these is the smallest particle?

Detailed Solution for Test: Physical & Chemical Changes - Question 2

An atom is the smallest particle that forms molecules.

Test: Physical & Chemical Changes - Question 3

Formation of a compound is

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When two or more atom combine together in fixed ratio new compound is formed so, it is a chemical change.

Test: Physical & Chemical Changes - Question 4

Which of the following is a reversible change?

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Melting of ice is a reversible change while burning of matchstick, changing of milk into curd and germination of seed is chemical change.

Test: Physical & Chemical Changes - Question 5

Crystals of copper sulphate are prepared by the method of

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

Crystals of copper sulphate are prepared by the method of crystallization. It is an example of physical change.

So option D is correct answer. 

Test: Physical & Chemical Changes - Question 6

In chemical change

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In chemical changes, molecules of substance rearrange to form a new substance with different property.

Test: Physical & Chemical Changes - Question 7

Which of the following is an example of physical change?

Detailed Solution for Test: Physical & Chemical Changes - Question 7

Boiling of water is a physical change:
Boiling of water produce water vapors. Chemically the water and water vapors composed of H2O molecules. Here the change in physical state occurred. During this conversion The liquid is changed in to gas. On cooling these water vapors condensed into water. Hence it is a reversible reaction.

Test: Physical & Chemical Changes - Question 8

Sea water is a

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Sea water is a mixture because sea water contain a number of salts dissolved in it.

Test: Physical & Chemical Changes - Question 9

Which is a method to prevent rust?

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Galvanization or galvanizing is the process of applying a protective zinc coating to steel or iron, to prevent rusting. 

Test: Physical & Chemical Changes - Question 10

Which among the following is an example of a Chemical Change? 

Detailed Solution for Test: Physical & Chemical Changes - Question 10

Rusting of iron is a chemical change because it happens due to a chemical reaction between iron and air in presence of moisture.

Test: Physical & Chemical Changes - Question 11

The reaction of H2 gas with oxygen gas to form water is an example of

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The electrons are transferred from Hydrogen to Oxygen , hence Oxygen is reduced and electrons are accepted by Oxygen from Hydrogen , hence Hydrogen is oxidised . Now , both oxidation and reduction are going together , therefore it is  a Redox (Reduction- Oxidation reaction) reaction 

Test: Physical & Chemical Changes - Question 12

The process of obtaining salt by the evaporation of sea water is called 

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Crystallisation is the  process of obtaining salt by the evaporation of sea water. 

Test: Physical & Chemical Changes - Question 13

Brown color of the apple after cutting is 

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When an apple is cut (or bruised), oxygen is introduced into the injured plant tissue. The oxygen  present in cells, polyphenol oxidase (PPO) enzymes in the chloroplasts rapidly oxidize phenolic compounds naturally present in the apple tissues to o-quinones, colorless precursors to brown-colored secondary products. So it's a chemical change.

Test: Physical & Chemical Changes - Question 14

When magnesium is burnt heat and light are produced. The burning of magnesium is a :

Detailed Solution for Test: Physical & Chemical Changes - Question 14

Burning of magnesium ribbon in air is an example of chemical change. This is because when we burn magnesium ribbon in presence of oxygen it forms magnesium oxide . From magnesium oxide we cannot get back it's original state.

Test: Physical & Chemical Changes - Question 15

 One or more new substances are formed due to

Detailed Solution for Test: Physical & Chemical Changes - Question 15

 One or more new substances are formed due to chemical change.

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