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CBSE Class 7  >  Class 7 Test  >  Science (Old NCERT)  >  Important Questions Test: Physical & Chemical Changes - Class 7 MCQ

Physical & Chemical Changes - Free MCQ Test with solutions, Class 7 Science


MCQ Practice Test & Solutions: Important Questions Test: Physical & Chemical Changes (10 Questions)

You can prepare effectively for Class 7 Science Class 7 (Old NCERT) with this dedicated MCQ Practice Test (available with solutions) on the important topic of "Important Questions Test: Physical & Chemical Changes". These 10 questions have been designed by the experts with the latest curriculum of Class 7 2026, to help you master the concept.

Test Highlights:

  • - Format: Multiple Choice Questions (MCQ)
  • - Duration: 20 minutes
  • - Number of Questions: 10

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Important Questions Test: Physical & Chemical Changes - Question 1
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In which one of the following situations chemical reaction does not occur?

Detailed Solution: Question 1

When common salt (sodium chloride) is exposed to air, no chemical reaction occurs under normal conditions because there is no change in its chemical composition. The exposure to air does not alter the chemical structure of common salt, hence no chemical reaction takes place. In contrast, burning coal in air, placing sodium in water, and keeping iron in moist air all result in chemical reactions due to changes in chemical composition.

Important Questions Test: Physical & Chemical Changes - Question 2
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A change in which a substance undergoes a change in its physical properties is called a _______ change.

Detailed Solution: Question 2

A physical change is when a substance changes in ways like shape, size, or color but remains the same substance. It can often be reversed, meaning you can change it back to how it was before.

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Important Questions Test: Physical & Chemical Changes - Question 3
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State whether the following statement is True or False

Paper undergoing cutting and reassembly represents a chemical change.

Detailed Solution: Question 3

  • When you cut a piece of paper into smaller pieces and then try to reassemble them, it is an example of a physical change, not a chemical change.
  • Physical changes are changes that do not alter the substance's identity.
  • In this case, cutting and reassembling paper does not change the paper into a different substance.
  • It is just changing the shape and size of the paper.

Important Questions Test: Physical & Chemical Changes - Question 4
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Magnesium oxide is formed by burning magnesium in presence of  _____.

Detailed Solution: Question 4

When magnesium reacts with oxygen, it forms magnesium oxide. This reaction creates a new substance called magnesium oxide by combining magnesium with oxygen.

Important Questions Test: Physical & Chemical Changes - Question 5
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What happens when you mix vinegar with baking soda?

Detailed Solution: Question 5

When you mix vinegar with baking soda, it creates a fizzy sound and you see bubbles coming out. This is because they react together and make something new. It's like a fun science experiment you can try at home!

Important Questions Test: Physical & Chemical Changes - Question 6
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When carbon dioxide is passed through lime water, _______ is formed, which makes lime water milky.

Detailed Solution: Question 6

When carbon dioxide is passed through lime water, calcium carbonate is formed, which makes lime water milky.

The reaction between carbon dioxide and lime water is a well-known test for the presence of carbon dioxide. Here’s a brief overview:

  • When carbon dioxide (CO2) is introduced to lime water (calcium hydroxide, Ca(OH)2), a chemical reaction occurs.
  • This reaction produces calcium carbonate (CaCO3), which is insoluble in water.
  • The formation of calcium carbonate causes the lime water to turn milky, indicating the presence of carbon dioxide.

Important Questions Test: Physical & Chemical Changes - Question 7
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State whether the following statement is True or False.

The burning of any substance is a chemical change.

Detailed Solution: Question 7

  • When something burns, it usually means it's changing into something new. This change is called a chemical change.
  • For example, when you burn a piece of paper, it turns into ash. This transformation from paper to ash is a chemical change because a new substance is formed.
  • So, the statement is TRUE.

Important Questions Test: Physical & Chemical Changes - Question 8
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Which of the following statements is true?

Detailed Solution: Question 8

Coating iron pipes with zinc prevents them from rusting easily because zinc acts as a protective barrier, preventing iron from reacting with moisture and oxygen. Cutting wood is a physical change, manure formation is a chemical change, and iron and rust are different substances, with rust being an oxide of iron.

Important Questions Test: Physical & Chemical Changes - Question 9
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The chemical name of Baking soda is _________.

Detailed Solution: Question 9

The chemical name of baking soda is Sodium Hydrogencarbonate. It is also known as Sodium Bicarbonate. Here’s why:
  • Baking soda is commonly used in baking as a leavening agent.
  • Its chemical formula is NaHCO3, indicating it contains sodium (Na), hydrogen (H), carbon (C), and oxygen (O).
  • It reacts with acids to produce carbon dioxide gas, which helps dough rise.
  • Unlike sodium chloride (table salt) or calcium carbonate, baking soda has unique properties that make it suitable for cooking.

Important Questions Test: Physical & Chemical Changes - Question 10
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What type of change occurs when carbon dioxide is mixed with lime water ?

Detailed Solution: Question 10

- When carbon dioxide is mixed with lime water (calcium hydroxide solution), a chemical change occurs.
- This reaction produces calcium carbonate, a white precipitate, and water:

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About this Class 7 Practice Test

This test contains 10 MCQs on Important Questions Test: Physical & Chemical Changes with detailed solutions for each question. It is part of the Science Class 7 (Old NCERT) course on EduRev, designed to align with the current Class 7 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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If you found this Important Questions Test: Physical & Chemical Changes MCQ Test helpful, you can further enhance your Class 7 preparation with in-depth courses on EduRev, for all the subjects and topics available in Science Class 7 (Old NCERT) course. The course offers:
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