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UPSC Exam  >  UPSC Test  >  Science & Technology CSE  >  Test: Changes Around Us - UPSC MCQ

Changes Around Us - Free MCQ Practice Test with solutions, UPSC Sci & Tech


MCQ Practice Test & Solutions: Test: Changes Around Us (10 Questions)

You can prepare effectively for UPSC Science & Technology for UPSC CSE with this dedicated MCQ Practice Test (available with solutions) on the important topic of "Test: Changes Around Us". These 10 questions have been designed by the experts with the latest curriculum of UPSC 2026, to help you master the concept.

Test Highlights:

  • - Format: Multiple Choice Questions (MCQ)
  • - Duration: 10 minutes
  • - Number of Questions: 10

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Test: Changes Around Us - Question 1
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Digestion of food is a

Detailed Solution: Question 1

Digestion of food is a chemical change as chemical action takes place to break the complex food into simpler substance by action of enzymes.

Test: Changes Around Us - Question 2
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Rotation of fan blade is a

Detailed Solution: Question 2

Rotation of fan blade is a periodic change as it is repeated at fixed interval of time.

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Test: Changes Around Us - Question 3
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In which one of the following kinds of changes no new substance are formed?

Detailed Solution: Question 3

Physical changes occur when objects or substances undergo a change that does not change their chemical composition.

This contrasts with the concept of chemical change in which the composition of a substance changes or one or more substances combine or break up to form new substances.

Test: Changes Around Us - Question 4
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What happens when you blow air into a balloon and then let the air out again?

Detailed Solution: Question 4

When we blow air into a balloon, it changes its shape and size. But when we let the air out, the balloon goes back to its original shape. So, blowing air into the balloon and then letting it out is an example of a change that can be reversed.

Test: Changes Around Us - Question 5
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What does the process of heating a metal rim to fit onto a wooden wheel demonstrate?

Detailed Solution: Question 5

Heating the metal rim to fit onto a wooden wheel demonstrates a reversible change. The metal expands when heated and contracts back to its original size when cooled. This process is used in many practical applications to fit metal parts securely.

Test: Changes Around Us - Question 6
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Which of the following changes cannot be reversed?

Detailed Solution: Question 6

Cooking an egg is an irreversible change because it alters the egg's chemical structure, and it cannot return to its raw form. Unlike freezing water or dissolving sugar, which can be reversed, cooking causes permanent changes.

Test: Changes Around Us - Question 7
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When you fold a piece of paper to make an airplane and then unfold it, what kind of change is this?

Detailed Solution: Question 7

Folding and then unfolding a piece of paper is a reversible physical change. The paper returns to its original state after unfolding, showing that physical changes like this one can be reversed without altering the paper's chemical composition.

Test: Changes Around Us - Question 8
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Which of the following changes involves the formation of a new substance?

Detailed Solution: Question 8

Baking a cake involves a chemical change where new substances are formed as ingredients react and transform during the baking process. This contrasts with physical changes like melting or freezing, where the substance's chemical composition remains the same.

Test: Changes Around Us - Question 9
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What change occurs when tar is heated for road repair?

Detailed Solution: Question 9

Heating tar causes it to expand, making it easier to apply during road repairs. Once it cools, it contracts and hardens, forming a solid surface. This demonstrates a reversible physical change.

Test: Changes Around Us - Question 10
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Which of the following is a physical change?

Detailed Solution: Question 10

Dissolving salt in water is a physical change because it involves mixing salt with water without altering the chemical structure of the salt. Unlike chemical changes such as burning or rusting, the salt can be recovered by evaporating the water.

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About this UPSC Practice Test

This test contains 10 MCQs on Changes Around Us with detailed solutions for each question. It is part of the Science & Technology for UPSC CSE course on EduRev, designed to align with the current UPSC syllabus. Each solution explains not just the correct answer but also gives you an understanding of the topic — not just to attempt the question but also help you prepare for the exam with practice.

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