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Test: Physical & Chemical Changes - UPSC MCQ


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

Test: Physical & Chemical Changes for UPSC 2024 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 2024 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

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

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

Test: Physical & Chemical Changes - Question 2

What is the formula of rust?

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

  • Rust is a chemical compound that forms when iron reacts with oxygen in the presence of water or moisture. The chemical formula of rust is Fe2O3.


Explanation:

  • When iron (Fe) comes in contact with oxygen (O2) and water (H2O), a chemical reaction occurs, leading to the formation of rust.

  • Rust is a reddish-brown compound that is commonly seen on iron and steel surfaces exposed to moisture and air.

  • The chemical formula Fe2O3 represents the compound where two iron atoms combine with three oxygen atoms to form rust.

  • Rust is a common form of corrosion that weakens iron and steel structures over time, leading to deterioration and loss of integrity.

Test: Physical & Chemical Changes - Question 3

What will happen if carbon dioxide gas is passed through lime water?

Detailed Solution for Test: Physical & Chemical Changes - Question 3
Explanation:

  • Formation of Calcium Carbonate: When carbon dioxide gas is passed through lime water, a chemical reaction occurs where the carbon dioxide reacts with the calcium hydroxide in the lime water to form calcium carbonate.

  • Lime Water Turns Milky: The formation of calcium carbonate results in the lime water turning milky or cloudy in appearance.

  • Both of These: Therefore, when carbon dioxide gas is passed through lime water, both the formation of calcium carbonate and the milky appearance of the lime water are observed as a result of the chemical reaction.

Test: Physical & Chemical Changes - Question 4

Which of the following is a reversible change?

Detailed Solution for Test: Physical & Chemical Changes - Question 4

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

Detailed Solution for Test: Physical & Chemical Changes - Question 6

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

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

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?

Detailed Solution for Test: Physical & Chemical Changes - Question 9

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

Galvanisation is a process used to prevent the rusting of which of the following?

Detailed Solution for Test: Physical & Chemical Changes - Question 11
Galvanisation Process to Prevent Rusting of Iron

  • Definition: Galvanisation is a process of applying a protective zinc coating to iron or steel to prevent rusting.


  • How it works: The zinc coating acts as a sacrificial anode, corroding before the iron does. This process protects the iron from rusting.


  • Prevention of rust: By forming a physical barrier between the iron and the surrounding environment, galvanisation prevents moisture and oxygen from coming into contact with the iron, thus inhibiting the rusting process.


  • Longevity: Galvanised iron or steel structures can last for decades without rusting, making them ideal for outdoor applications where corrosion is a concern.


  • Common uses: Galvanised iron is commonly used in construction, automotive, and industrial applications where corrosion resistance is required.

Test: Physical & Chemical Changes - Question 12

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

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

The process of obtaining salt by the evaporation of sea water is a process of crystallization which is a reversible process and a physical change, these crystals will convert again in salt solution (seawater) by dissolving them in water. 

Test: Physical & Chemical Changes - Question 13

Brown color of the apple after cutting is 

Detailed Solution for Test: Physical & Chemical Changes - Question 13

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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