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Test: Physical & Chemical Changes - UPSC MCQ


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

Test: Physical & Chemical Changes for UPSC 2025 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 2025 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 process where solid ice turns into liquid water.
  • This change is classified as a physical change because:

    • No new substances are created; water remains water in different states (solid vs. liquid).
    • The chemical composition (H2O) stays the same before and after the melting process.
  • Physical changes can often be reversed, such as freezing water back into ice.
Test: Physical & Chemical Changes - Question 2

Which of the following is a correct observation for a chemical change?

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

.Answer: B) A new substance is formed.

  • A chemical change results in the formation of one or more new substances with different properties from the original substances.
  • This process involves breaking and forming chemical bonds, leading to a change in the chemical composition.
  • Examples include rusting of iron, burning of wood, and baking a cake.
  • Unlike physical changes, chemical changes are usually not easily reversible and often involve energy changes.
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 wax 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

Which is a method to prevent rust?

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

1. Galvanisation

Explanation: Galvanisation is a process used to prevent rusting by coating iron or steel with a layer of zinc. The zinc layer acts as a protective barrier, preventing moisture and oxygen from reaching the metal surface and causing rust.

  • Sedimentation and crystallization are unrelated to rust prevention.
Test: Physical & Chemical Changes - Question 7

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

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

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

Rusting of iron is an example of a chemical change because it involves a chemical reaction between iron, oxygen, and moisture to form a new substance, iron oxide (rust). This process changes the chemical composition of the iron, and the change is irreversible under normal conditions.

In contrast:

  • Heating of an iron rod (1) is a physical change as it only increases the temperature of the iron without changing its chemical structure.
  • Melting of wax (2) is also a physical change as it changes the state of the wax from solid to liquid without altering its chemical composition.
  • Woollen yarn to knitted sweater (4) is a physical change as it involves changing the shape and form of the yarn without changing its chemical properties.
Test: Physical & Chemical Changes - Question 8

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

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

The burning of magnesium ribbon in air is an example of a chemical and exothermic change. This is because when magnesium burns in the presence of oxygen, it forms magnesium oxide and releases energy in the form of heat and light. This release of energy is characteristic of an exothermic reaction. Additionally, from magnesium oxide, we cannot revert to its original state, which confirms the chemical change.

Test: Physical & Chemical Changes - Question 9

How can we prevent rusting of iron articles?

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

To prevent rusting of iron articles, one simple way is to apply a coat of paint or grease regularly. This helps to protect the iron from coming in contact with oxygen or water, which are essential for rust formation.

Test: Physical & Chemical Changes - Question 10

Which of the following statements is true for a chemical change?

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

Answer: c) It is a permanent change that means it can not be reversed.

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