Class 6 Science Chapter 6 Changes Around Us Oxford Solution

In our daily life, we notice many changes happening around us. Some changes are fast, like melting of ice, while others are slow, like rusting of iron. In Class 6 Science Chapter 6 Changes around us Oxford, we learn about different kinds of changes such as reversible and irreversible, physical and chemical, and natural and man-made changes.

This chapter helps us understand how and why these changes occur, and their importance in our daily life. By studying this, students will be able to classify changes with examples and relate them to real-life situations.

Class 6 Science Chapter 6 Changes around us Oxford Book Answers

I. Objective type questions

A. Fill in the blanks with the correct words.

1. Glass sheets and flower petals are examples of (smooth/rough) surfaces.
Answer: Smooth

2. (Hard/Soft) materials can be compressed easily.
Answer: Hard

3. Materials that allow some light to pass through them are called (transparent/translucent) materials.
Answer: Translucent

4. (Solids/Gases) are highly compressible.
Answer: Gases

5. Liquids that do not dissolve in water are called (immiscible/soluble) in water.
Answer: Immiscible

B. Choose the correct option.

1. Which of the following has a rough surface?
a) Sandpaper
b) Petals of a flower
c) Surface of an apple
d) Glass sheet
Answer: a) Sandpaper

2. Which of the following can be compressed to a small extent?
a) Gases
b) Liquids
c) Solids
d) None of these
Answer: b) Liquids

3. Which of the following is translucent?
a) Cellophane paper
b) Oiled paper
c) Water
d) Wood
Answer: a) Cellophane paper

4. Which of the following is a characteristic feature of a solid?
a) It has no definite shape.
b) It is highly compressible.
c) It has no definite volume.
d) Its particles are closely packed.
Answer: d) Its particles are closely packed.

5. Which of the following is insoluble in water?
a) Common salt
b) Sugar
c) Wax
d) Carbon dioxide
Answer: c) Wax

6. Which of the following is a conductor of heat?
a) Metals
b) Plastic
c) Bamboo
d) Glass
Answer: a) Metals

7. Which of the following states of matter has close packing of particles?
a) Solid state
b) Liquid state
c) Gaseous state
d) All of these
Answer: a) Solid state

8. Which of the following materials will sink in water?
a) Wood
b) Feather
c) Rock
d) Leaf
Answer: c) Rock

9. Which of the following gases is soluble in water?
a) Hydrogen
b) Nitrogen
c) Helium
d) Carbon dioxide
Answer: d) Carbon dioxide

10. Which of the following is a conductor of electricity?
a) Air
b) Copper wire
c) Plastic
d) Wood
Answer: b) Copper wire

II. Very short answer type questions

1. Give two examples of soft materials.
Answer: Cotton, Rubber

2. Give two examples of transparent materials.
Answer: Glass, Water

3. Give two examples of opaque materials.
Answer: Wood, Metal

4. Give two examples of gases insoluble in water.
Answer: Oxygen, Nitrogen

5. Give two examples of magnetic materials.
Answer: Iron, Nickel

6. Give two examples of insulators of heat.
Answer: Wood, Plastic

B. Give one word for the following:

1. Materials that have uneven or bumpy surface.
Answer: Rough materials

2. Materials that do not allow light to pass through them.
Answer: Opaque materials

3. Liquids that are soluble in water.
Answer: Miscible liquids

4. Materials that are attracted to a magnet.
Answer: Magnetic materials

5. Materials that do not have a definite shape and volume.
Answer: Gases

III. Short answer type questions

1. Which property of metals makes them suitable for making jewellery?
Answer: Metals are malleable and ductile, so they can be drawn into wires and sheets to make jewellery.

2. Compare hard and soft materials with one example of each.
Answer:

Hard materials cannot be easily compressed (e.g., Iron).
Soft materials can be easily compressed (e.g., Rubber).

3. What is floatation?
Answer: The tendency of lighter objects to float and heavier objects to sink in water is called floatation.

4. Why are cooking utensils made of metals while their handles are made of wood or hard plastic?
Answer:

Metals are good conductors of heat, so they help in cooking.
Wood and hard plastic are insulators, so they are used for handles to protect from heat.

5. Why are electric cables made of metal wires?
Answer: Because metals are good conductors of electricity.

6. What are conductors and insulators of electricity? Give one example of each.
Answer:

Conductors: Materials that allow electricity to pass (e.g., Copper).
Insulators: Materials that do not allow electricity to pass (e.g., Plastic).

IV. Long answer type questions

1. Differentiate between transparent, translucent and opaque. Give two examples for each.
Answer: Materials can be classified based on how they allow light to pass through them:

Examples: Wood, cardboard.

Transparent materials –

These materials allow light to pass through them completely.
Objects can be seen clearly through them.

Examples: Clear glass, clean water.

Translucent materials –

These materials allow light to pass through them only partially.
Objects cannot be seen clearly, they appear blurred or unclear.

Examples: Oiled paper, frosted glass.

Opaque materials –

These materials do not allow light to pass through them at all.
Objects cannot be seen through them.

2. What is magnetism? Describe an activity to differentiate between magnetic and non-magnetic substances.
Magnetism is a force of attraction or repulsion that acts between certain materials, mainly those made of iron, nickel, cobalt, and some alloys. It arises due to the motion of electric charges, especially the movement of electrons inside atoms.

Activity to Differentiate Between Magnetic and Non-magnetic Substances

This simple activity helps you to classify objects based on their magnetic properties.

Materials:

A magnet (bar magnet or horseshoe magnet)
Various small objects:
- Magnetic: Paperclip, iron nail, steel key, pin
- Non-magnetic: Plastic ruler, rubber band, wooden stick, glass marble, aluminum foil, paper

Procedure:

Gather the objects and place them on a table or a flat surface.
Take the magnet and slowly bring it close to each object, one at a time.
Observe what happens. If an object is pulled toward the magnet, it is a magnetic substance.
If an object does not react to the magnet, it is a non-magnetic substance.
Record your observations in a two-column chart to organize your findings. This will help you see which materials are magnetic and which are not.

This activity demonstrates that magnetism is a property of specific materials and not all objects, even those made of metal, are attracted to a magnet.

3. Describe grouping of materials depending upon their solubility in water.
Answer: Materials can be grouped into two main types based on their solubility in water:

Soluble materials – These are substances that completely dissolve in water. Example: sugar, salt, lemon juice.
Insoluble materials – These are substances that do not dissolve in water. They remain separate and settle down or float. Example: sand, chalk powder, oil.

Thus, depending on whether a material dissolves in water or not, we can classify it as soluble or insoluble.

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In this lesson, we explored different types of changes happening around us, such as reversible and irreversible changes, and how they affect our daily life. Understanding these ideas in Class 6 Science Chapter 6 Changes around us Oxford helps students relate science to real-world situations. By studying Class 6 Science Chapter 6 Changes around us Oxford, learners become more observant and aware of the changes in nature and the environment.