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Important Questions Test: Changes Around Us - UPSC MCQ


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20 Questions MCQ Test - Important Questions Test: Changes Around Us

Important Questions Test: Changes Around Us for UPSC 2024 is part of UPSC preparation. The Important Questions Test: Changes Around Us questions and answers have been prepared according to the UPSC exam syllabus.The Important Questions Test: Changes Around Us MCQs are made for UPSC 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Important Questions Test: Changes Around Us below.
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Important Questions Test: Changes Around Us - Question 1

Which of the following is a reversible change?

Detailed Solution for Important Questions Test: Changes Around Us - Question 1

I) The changes where the physical property of the substance varies without any formation of new products.
ii) These changes are reversible and the products are identical to the reactants.
Ex: Melting of ice, during this change the water changes from its solid form to liquid form, melting of wax.

Important Questions Test: Changes Around Us - Question 2

In physical changes

Detailed Solution for Important Questions Test: Changes Around Us - Question 2

In physical changes no new substance is formed and can be returned back by physical process.

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Important Questions Test: Changes Around Us - Question 3

In general, on heating metals _______

Detailed Solution for Important Questions Test: Changes Around Us - Question 3

When a material is heated, the kinetic energy of that material increases and its atoms and molecules move about more. This means that each atom will take up more space due to its movement so the material will expand.

Important Questions Test: Changes Around Us - Question 4

Melting of ice is a

Detailed Solution for Important Questions Test: Changes Around Us - Question 4

Melting of ice into water is a physical change as no new substance is formed with different properties.

Important Questions Test: Changes Around Us - Question 5

Which of these is the smallest particle?

Detailed Solution for Important Questions Test: Changes Around Us - Question 5

An atom is the smallest particle of an element which cannot be seen with naked eyes.

Important Questions Test: Changes Around Us - Question 6

Formation of a compound is

Detailed Solution for Important Questions Test: Changes Around Us - Question 6

Formation of a compound is chemical change as it is a permanent change

Important Questions Test: Changes Around Us - Question 7

Which of the following is a reversible change?

Detailed Solution for Important Questions Test: Changes Around Us - Question 7

Those changes in which change can be reversed back is called as reversible change as melting of ice.

Important Questions Test: Changes Around Us - Question 8

Chemical changes are

Detailed Solution for Important Questions Test: Changes Around Us - Question 8

Chemical changes are changes that occur in the chemical properties of the substance like its flammability, radioactivity, etc. All chemical changes are mostly irreversible changes. Once the chemical properties of a substance are changed, it becomes another substance. Thus, it cannot return to its original state in most cases.

Important Questions Test: Changes Around Us - Question 9

In chemical change

Detailed Solution for Important Questions Test: Changes Around Us - Question 9

In chemical change, molecules of a substance and rearrange in different order to produce new character.

Important Questions Test: Changes Around Us - Question 10

Sea water is a

Detailed Solution for Important Questions Test: Changes Around Us - Question 10

Sea water is a mixture as it contains a number of salts dissolved in it but not in fixed ratio.

Important Questions Test: Changes Around Us - Question 11

Which of the following is a reversible change?

Detailed Solution for Important Questions Test: Changes Around Us - Question 11

A reversible change is a physical change that can be undone. A final substance can be converted back to the original substance without creating any new material. Freezing, melting, dissolving, boiling, evaporating and condensing are reversible changes.

Important Questions Test: Changes Around Us - Question 12

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

Detailed Solution for Important Questions Test: Changes Around Us - Question 12

A chemical change (chemical reaction) is a change of materials into other, new materials with different properties, and one or new substances are formed. Burning of wood is a chemical change as new substances which cannot be changed back (e.g. carbon dioxide) are formed.

Important Questions Test: Changes Around Us - Question 13

In a chemical change

Detailed Solution for Important Questions Test: Changes Around Us - Question 13

In a chemical change molecules of substance change and rearranged to change into new product.

Important Questions Test: Changes Around Us - Question 14

Which of the following is an example of physical change?

Detailed Solution for Important Questions Test: Changes Around Us - Question 14

A physical change is a type of change in which the form of matter is altered but one substance is not transformed into another. The size or shape of matter may be changed, but no chemical reaction occurs. Physical changes are usually reversible.

Important Questions Test: Changes Around Us - Question 15

Burning of candle is

Detailed Solution for Important Questions Test: Changes Around Us - Question 15

Burning of candle is both physical and chemical change as wax first melt which is a physical change and burning of wick is a chemical change that produce carbon dioxide gas.

Important Questions Test: Changes Around Us - Question 16

Which one is a periodic change

Detailed Solution for Important Questions Test: Changes Around Us - Question 16

Change in season is periodic change as it is repeated at regular interval of time.

Important Questions Test: Changes Around Us - Question 17

Rusting of iron is a

Detailed Solution for Important Questions Test: Changes Around Us - Question 17

Rusting of iron is a chemical change as new substance rust is formed with different property.

Important Questions Test: Changes Around Us - Question 18

Souring of milk is a

Detailed Solution for Important Questions Test: Changes Around Us - Question 18

Souring of milk is undesirable change as milk gets spoiled due to souring which is not desired.

Important Questions Test: Changes Around Us - Question 19

In a chemical change

Detailed Solution for Important Questions Test: Changes Around Us - Question 19

The energy change in a chemical reaction is due to the difference in the amounts of stored chemical energy between the products and the reactants.

Important Questions Test: Changes Around Us - Question 20

Which of the following is an example of physical change?

Detailed Solution for Important Questions Test: Changes Around Us - Question 20

Boiling of water is an example of physical change as water vapour can be changes into water by cooling.

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