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Test: Changes Around Us - UPSC MCQ


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10 Questions MCQ Test Science & Technology for UPSC CSE - Test: Changes Around Us

Test: Changes Around Us for UPSC 2024 is part of Science & Technology for UPSC CSE preparation. The Test: Changes Around Us questions and answers have been prepared according to the UPSC exam syllabus.The Test: Changes Around Us MCQs are made for UPSC 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Changes Around Us below.
Solutions of Test: Changes Around Us questions in English are available as part of our Science & Technology for UPSC CSE for UPSC & Test: Changes Around Us solutions in Hindi for Science & Technology for UPSC CSE course. Download more important topics, notes, lectures and mock test series for UPSC Exam by signing up for free. Attempt Test: Changes Around Us | 10 questions in 10 minutes | Mock test for UPSC preparation | Free important questions MCQ to study Science & Technology for UPSC CSE for UPSC Exam | Download free PDF with solutions
Test: Changes Around Us - Question 1
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Digestion of food is a

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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 for Test: Changes Around Us - 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 for Test: Changes Around Us - 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 for Test: Changes Around Us - 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 for Test: Changes Around Us - 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 for Test: Changes Around Us - 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 for Test: Changes Around Us - 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 for Test: Changes Around Us - 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 for Test: Changes Around Us - 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 for Test: Changes Around Us - 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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