Last Updated on May 7, 2025 by XAM CONTENT
Hello students, we are providing case study questions for class 7 Science. Case study questions are the new question format that is introduced in CBSE board. The resources for case study questions are very less. So, to help students we have created chapterwise case study questions for class 7 Science. In this article, you will find case study questions for cbse class 7 Science chapter 5 Changes Around Us: Physical and Chemical.
| Chapter | Changes Around Us: Physical and Chemical |
| Book | Curiosity: Textbook of Science for Grade 7 |
| Type of Questions | Case Study Questions |
| Nature of Questions | Competency Based Questions |
| Board | CBSE |
| Class | 7 |
| Subject | Science |
| Useful for | Class 7 Studying Students |
| Answers provided | Yes |
| Difficulty level | Mentioned |
| Important Link | Class 7 Science Chapterwise Case Study |
Case Study Questions on Changes Around Us: Physical and Chemical
Case Study Question 1
Passage: The Case of the Melting Ice and Inflated Balloons
During a group discussion, students shared everyday changes they had observed—ice cubes melting, paper being folded, and balloons inflating or bursting. Their teacher explained that these are all examples of physical changes, which may alter the size, shape, or state of matter, but do not produce new substances. They also discussed reversible and irreversible changes.
Q1. When ice melts into water, what type of change occurs?
(a) Physical and reversible
(b) Physical and irreversible
(c) Chemical and reversible
(d) Chemical and irreversible
Answer: (a)
Difficulty Level: Easy
Explanation: Melting is a physical change, and since water can be frozen back into ice, it is reversible.
Q2. Bursting of an inflated balloon is:
(a) A reversible physical change
(b) An irreversible physical change
(c) A chemical change
(d) A periodic change
Answer: (b)
Difficulty Level: Moderate
Explanation: When a balloon bursts, the shape is permanently lost; it’s a physical change that cannot be reversed.
Q3. Folding paper into different shapes (like origami) is classified as:
(a) Physical and irreversible
(b) Chemical and irreversible
(c) Physical and reversible
(d) Chemical and reversible
Answer: (c)
Difficulty Level: Moderate
Explanation: The paper’s shape changes but no new substance is formed. You can unfold it, making it reversible.
Q4. What is a common feature of all physical changes?
(a) Formation of a new substance
(b) Permanent colour change
(c) Only physical properties like shape or state change
(d) Emission of light
Answer: (c)
Difficulty Level: Easy
Explanation: Physical changes affect only appearance or state, not the chemical nature of the substance.
Case Study Question 2
Passage: Lime Water and the Magic of Chemical Reactions
In a fun activity, students blew air into lime water and observed that it turned milky. They repeated the experiment with vinegar and baking soda and noticed gas bubbles and similar results. The teacher explained that new substances were formed, indicating chemical changes. They also explored rusting of iron, burning of magnesium ribbon, and the idea of combustion.
Q1. What is the white substance formed when carbon dioxide is passed through lime water?
(a) Sodium carbonate
(b) Calcium carbonate
(c) Carbon monoxide
(d) Calcium chloride
Answer: (b)
Difficulty Level: Tough
Explanation: Carbon dioxide reacts with calcium hydroxide in lime water to form calcium carbonate, making it milky.
Q2. Which observation indicates a chemical change when vinegar reacts with baking soda?
(a) The solution remains clear
(b) A strong smell develops
(c) Bubbles form and a new gas is released
(d) The liquid freezes
Answer: (c)
Difficulty Level: Moderate
Explanation: Gas bubbles and a new substance (carbon dioxide) indicate a chemical reaction is taking place.
Q3. What kind of change is rusting of iron?
(a) Physical and reversible
(b) Physical and irreversible
(c) Chemical and irreversible
(d) Periodic and physical
Answer: (c)
Difficulty Level: Easy
Explanation: Rusting forms a new substance (iron oxide), making it a chemical and irreversible change.
Q4. What is required for combustion to occur?
(a) A cold environment
(b) Water and light
(c) A combustible substance, oxygen, and heat
(d) Just oxygen
Answer: (c)
Difficulty Level: Moderate
Explanation: Combustion needs fuel, oxygen, and a minimum ignition temperature to start the burning process.
We hope the given case study questions for Changes Around Us: Physical and Chemical Class 7 helps you in your learning.
🎮 Bonus Challenge: Can You Solve This Scientific Mystery?
🔥 Solve the Mystery: The Curious Case of Changing Things
Tara observed that wet clothes dry up, a banana turns brown, and rust appears on iron. “So many things around me keep changing!” she said.
Can you help Tara figure out which changes are **physical**, which are **chemical**, and why? Let’s solve the mystery of everyday science!
Also check
- Curiosity Class 7 Science Chapter 12 Earth, Moon, and the Sun Case Study Questions
- Curiosity Class 7 Science Chapter 11 Light: Shadows and Reflections Case Study Questions
- Curiosity Class 7 Science Chapter 10 Life Processes in Plants Case Study Questions
- Curiosity Class 7 Science Chapter 9 Life Processes in Animals Case Study Questions
- Curiosity Class 7 Science Chapter 8 Measurement of Time and Motion Case Study Questions
- Curiosity Class 7 Science Chapter 7 Heat Transfer in Nature Case Study Questions
- Curiosity Class 7 Science Chapter 6 Adolescence: A Stage of Growth and Change Case Study Questions
- Curiosity Class 7 Science Chapter 5 Changes Around Us: Physical and Chemical Case Study Questions
- Curiosity Class 7 Science Chapter 4 The World of Metals and Non-metals Case Study Questions
- Curiosity Class 7 Science Chapter 3 Electricity: Circuits and their Components Case Study Questions
- Curiosity Class 7 Science Chapter 2 Exploring Substances: Acidic, Basic, and Neutral Case Study Questions
- Curiosity Class 7 Science Chapter 1 The Ever-Evolving World of Science Case Study Questions
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Topics from which case study questions may be asked
- Reversible and irreversible changes
- Chemical changes
- Natural changes
Changes can be physical or chemical — and recognizing them is key to chemistry.
Frequently Asked Questions (FAQs) on Changes Around Us: Physical and Chemical Case Study Questions
Q1: What are case study questions in Changes Around Us: Physical and Chemical?
A1: These are competency-based questions based on real-life situations and concepts from Changes Around Us: Physical and Chemical.
Q2: Are case study questions part of Class 7 Science CBSE exams?
A2: Yes, CBSE includes such questions in line with NEP guidelines.
Q3: How can I practice Class 7 case study questions?
A3: Practice from chapterwise question banks and NCERT-integrated sources.
Q4: Are answers provided for Changes Around Us: Physical and Chemical case study questions?
A4: Yes, each case study question includes an answer.
