The chapter “Changes Around Us” From Class 6 Science BOSEM (Board of Secondary Education Manipur) is about learning about various changes that occur in day-to-day life. This chapter introduces students to the concept of change as a fundamental aspect of the natural world, focusing on both physical and chemical changes, their causes, and their consequences.
👉Changes Around Us: Learning Objectives
At the end of the chapter, students have the concept and understanding of different types of changes happening around them and the reason behind these changes.
👉 Changes Around Us Questions and Answers: Free PDF Download
The Questions and answers for the chapter “Change Around Us” are provided below. All the Answers are prepared by a subject expert.
This will help you in your exam preparation as well as in building the concepts about the lesson. The Answers are also provided in PDF. Anyone can download and read offline.
Questions And Answers
Q1. To walk through a waterlogged area, you usually shorten the length of your dress by folding it. Can this change be reversed?
Ans: Yes, this change can be reversed by unfolding the dress again.
Q2. You accidentally dropped your favourite toy and broke it. This is a change you did not want. Can it be reversed?
Ans: No, this change cannot be reversed.
Q3. Some changes are listed in the following table. For each change, write in the blank column whether the change can be reversed or not.
| Change | Can be reversed (yes/no) |
|---|---|
| Sawing a piece of wood | – |
| Melting of ice candy | – |
| Dissolving sugar in water | – |
| Cooking food | – |
| Ripening of a mango | – |
| Souring of milk | – |
Ans:
| Change | Can be reversed (yes/no) |
|---|---|
| Sawing a piece of wood | No |
| Melting of ice candy | Yes |
| Dissolving sugar in water | Yes |
| Cooking food | No |
| Ripening of a mango | No |
| Souring of milk | No |
Q4. A drawing sheet changes when you draw a picture on it. Can you reverse this change?
Ans: It depends on what type of materials were used to draw the picture. If the pencil is used to draw the picture then the change can be reversed by erasing the drawing with an eraser. If pen or colours are used to draw the picture then the change cannot be reversed.
Q5.Give examples to explain the difference between changes that can and cannot be reversed.
Ans: Examples are as follows:
| Melting of ice cube | Sawing off a piece of wood |
| Dissolving sugar in water | Cooking food |
| Inflation of balloon | Ripening of a mango |
| To roll out a roti from a dough | Burning of incense sticks or wood |
| Stretching of rubber band | Making paper toys by cutting the paper |
| Drawing a picture with a pencil | Making paper toys by cutting the paper |
| Milk changes into curd | Growth of a living being |
Q6. A thick coating of Plaster of Paris (POP) paste is applied over the bandage on a fractured bone. It becomes hard on drying to keep the fractured bone immobilized. Can the change in POP be reversed?
Ans: No, the change in Plaster of Paris cannot be reversed.
Q7. A bag of cement lying in the open gets wet due to rain during the night. The next day, the sun shines brightly. Do you think the changes, which have occurred in the cement, could be reversed?
Ans: The changes cannot be reversed because the cement that hardens up after getting wet cannot be obtained back.
Extra Questions And Answers
Q1. Explain how the wooden handle Of a tool is fixed to the iron blade.
Ans: There is a ring on the iron blade of a tool to fit the wooden handle. This ring is slightly smaller in size than the wooden handle. To fix the handle, the ring is heated and its size expands and the handle easily fits into the ring. When the ring cools down it contracts and fits tightly onto the handle.
Q2. What are the changes that occur when we burn wood? Is it reversible or irreversible changes?
Ans: Wood changes into ash and gases when burnt. The changes in this case are irreversible changes.
Q3. Match the following
| a) Evaporation | i) Irreversible changes |
| b) Melting | ii) Reversible changes |
| c) Dissolving of sugar | iii) When Heated, water changes to water vapour |
| d) Making curd | iv) Ice melts into water. |
Ans:
Q4. Differentiate between reversible and irreversible change.
Ans: Reversible changes are changes which can be reversed back to their original form whereas, irreversible changes are permanent changes that cannot be reversed back.
Q5. Name a substance that can change to all three forms of matter: solid, liquid and gas.
Ans: Water.
When water is heated above 100 °C it changes to gas (vapour form), when cooled down at room temperature it changes back to liquid form. When it cools below 0°C, it forms into ice I, e solid form.
Pingback: BOSEM Class 6 Syllabus 2023 - Infohuntz