CBSE Class 6 Science Chapter 6: Materials Around Us — Assertion & Reason
CBSE Class 6 Science Assertion & Reason
Expert crafted · Instant PDF download · 2026-27
The following Assertion and Reason questions are based on Chapter 6: Materials Around Us from the NCERT Class 6 Science textbook Curiosity. Each question has four options — read both the Assertion (A) and Reason (R) carefully before selecting your answer.
How to attempt Assertion & Reason questions:
(a) Both A and R are true, and R is the correct explanation of A.
(b) Both A and R are true, but R is NOT the correct explanation of A.
(c) A is true, but R is false.
(d) A is false, but R is true.
(a) Both A and R are true, and R is the correct explanation of A.
(b) Both A and R are true, but R is NOT the correct explanation of A.
(c) A is true, but R is false.
(d) A is false, but R is true.
Assertion & Reason Questions
1
Assertion (A): A single object can be made up of a combination of different materials.
Reason (R): A pen, for example, is typically made of materials like plastic, metal, and ink.
Reason (R): A pen, for example, is typically made of materials like plastic, metal, and ink.
Answer: (a)
Both A and R are true, and R is the correct explanation of A. Objects are often created by combining multiple materials to serve different functional parts, just like the plastic body and metal nib of a pen.
2
Assertion (A): All materials that have a shiny surface are always metals.
Reason (R): Surfaces of some materials are made shiny by polishing or coating them with plastic or wax.
Reason (R): Surfaces of some materials are made shiny by polishing or coating them with plastic or wax.
Answer: (d)
A is false, but R is true. Not all shiny things are metals. Some non-metallic objects look lustrous because they are polished or coated with shiny layers.
3
Assertion (A): Iron objects sometimes lose their shine and look dull over time.
Reason (R): The action of air and moisture on metals can make them lose their natural lustre.
Reason (R): The action of air and moisture on metals can make them lose their natural lustre.
Answer: (a)
Both A and R are true, and R is the correct explanation of A. Exposure to air and moisture degrades the surface of many metals, masking their true lustrous appearance until freshly cut.
4
Assertion (A): Sponge is an example of a hard material.
Reason (R): Materials which can be compressed or scratched easily are called soft.
Reason (R): Materials which can be compressed or scratched easily are called soft.
Answer: (d)
A is false, but R is true. A sponge can be compressed very easily, making it a soft material, not a hard one.
5
Assertion (A): Frosted glass and butter paper are considered translucent materials.
Reason (R): Translucent materials allow us to see through them, but not clearly.
Reason (R): Translucent materials allow us to see through them, but not clearly.
Answer: (a)
Both A and R are true, and R is the correct explanation of A. Frosted glass and butter paper scatter light as it passes through, which is why objects on the other side appear hazy.
6
Assertion (A): We can easily see through a closed wooden door.
Reason (R): Wood is an opaque material that does not allow light to pass through at all.
Reason (R): Wood is an opaque material that does not allow light to pass through at all.
Answer: (d)
A is false, but R is true. A closed wooden door blocks all light, making it opaque, which means it is impossible to see through it.
7
Assertion (A): Sugar and salt are said to be soluble in water.
Reason (R): They completely disappear when mixed and stirred in water.
Reason (R): They completely disappear when mixed and stirred in water.
Answer: (a)
Both A and R are true, and R is the correct explanation of A. Because sugar and salt dissolve fully and disappear into the water, they are classified as soluble substances.
8
Assertion (A): Sand and sawdust dissolve completely in water if stirred long enough.
Reason (R): Materials that do not mix with water and do not disappear even after stirring are called insoluble.
Reason (R): Materials that do not mix with water and do not disappear even after stirring are called insoluble.
Answer: (d)
A is false, but R is true. Sand and sawdust are insoluble materials. No matter how much you stir, they will not dissolve in water.
9
Assertion (A): Oxygen gas dissolved in water is essential for the survival of aquatic animals and plants.
Reason (R): All gases are completely soluble in water.
Reason (R): All gases are completely soluble in water.
Answer: (c)
A is true, but R is false. While oxygen does dissolve in water and sustains aquatic life, not all gases are soluble in water.
10
Assertion (A): Any object which is heavier or lighter can be measured in terms of a property called mass.
Reason (R): The one which is heavier has more mass and the one which is lighter has less mass.
Reason (R): The one which is heavier has more mass and the one which is lighter has less mass.
Answer: (a)
Both A and R are true, and R is the correct explanation of A. Mass is the property that determines the quantity of matter, making an object heavier (more mass) or lighter (less mass).
11
Assertion (A): The space occupied by water or any other matter represents its volume.
Reason (R): Two glass tumblers of the same total capacity must always contain the exact same volume of water.
Reason (R): Two glass tumblers of the same total capacity must always contain the exact same volume of water.
Answer: (c)
A is true, but R is false. Even if two tumblers have the same total capacity, they can contain different volumes of water (e.g., one could be half-filled and the other fully-filled).
12
Assertion (A): Air is not considered matter because we cannot see it.
Reason (R): Anything that occupies space and has mass is called matter.
Reason (R): Anything that occupies space and has mass is called matter.
Answer: (d)
A is false, but R is true. Even though it is invisible, air occupies space and has mass, which absolutely classifies it as matter.
13
Assertion (A): A volume of 500 millilitres of water should be written as 500 mL.
Reason (R): The abbreviation for millilitre has 'm' in lower case and 'L' in upper case with no space between them.
Reason (R): The abbreviation for millilitre has 'm' in lower case and 'L' in upper case with no space between them.
Answer: (a)
Both A and R are true, and R is the correct explanation of A. By SI unit conventions, the abbreviation for millilitre is strictly written as 'mL' without a space inside the symbol.
14
Assertion (A): Ayurveda describes all physical matter using 20 properties grouped in opposite pairs.
Reason (R): 'Guru' (heavy) and 'laghu' (light) is one such pair of opposite properties.
Reason (R): 'Guru' (heavy) and 'laghu' (light) is one such pair of opposite properties.
Answer: (b)
Both A and R are true, but R is NOT the correct explanation of A. R simply provides a single example of the 20 properties used in Ayurveda, rather than explaining why the system exists.
15
Assertion (A): A tumbler meant to store water is never made of pieces of cloth.
Reason (R): We choose a material to make an object depending on its properties, and cloth cannot hold water.
Reason (R): We choose a material to make an object depending on its properties, and cloth cannot hold water.
Answer: (a)
Both A and R are true, and R is the correct explanation of A. Because cloth is porous and lets liquids pass through, it lacks the essential property required to act as a tumbler.
16
Assertion (A): All materials possess the properties of mass and volume.
Reason (R): Anything that occupies space (volume) and has mass is called matter, and materials are types of matter.
Reason (R): Anything that occupies space (volume) and has mass is called matter, and materials are types of matter.
Answer: (a)
Both A and R are true, and R is the correct explanation of A. Because all materials are forms of matter, they inherently must have mass and take up space.
17
Assertion (A): Certain liquids, like oil, do not mix with water.
Reason (R): When mixed and left undisturbed, they form a completely separate layer.
Reason (R): When mixed and left undisturbed, they form a completely separate layer.
Answer: (b)
Both A and R are true, but R is NOT the correct explanation of A. The formation of a separate layer is an observation/result of the fact that oil is insoluble in water, not the explanation of why.
18
Assertion (A): We group objects into categories because it helps us study and observe patterns in their properties.
Reason (R): Objects can only be classified based on their colour and shape.
Reason (R): Objects can only be classified based on their colour and shape.
Answer: (c)
A is true, but R is false. Grouping helps us study patterns, but objects can be classified by many properties beyond just colour and shape, such as hardness, transparency, or solubility.
19
Assertion (A): Hardness and softness are relative properties of materials.
Reason (R): A piece of rubber is harder than a sponge, but it is softer than a piece of iron.
Reason (R): A piece of rubber is harder than a sponge, but it is softer than a piece of iron.
Answer: (a)
Both A and R are true, and R is the correct explanation of A. Since an object can be harder than one material but softer than another, hardness is a comparative (relative) trait.
20
Assertion (A): The mass of an object indicates the quantity of matter present in it.
Reason (R): The standard units used to measure mass are litre (L) and millilitre (mL).
Reason (R): The standard units used to measure mass are litre (L) and millilitre (mL).
Answer: (c)
A is true, but R is false. Mass does indicate the quantity of matter, but it is measured in grams (g) or kilograms (kg). Litres and millilitres are used to measure volume.
❓ Frequently Asked Questions
What is covered in CBSE Class 6 Science Chapter 6 Materials Around Us?
This chapter covers all key topics from Materials Around Us as per CBSE 2026-27 syllabus.
Is this Assertion & Reason useful for CBSE board exams?
Yes, designed for CBSE Class 6 board exam preparation covering the complete syllabus.
Are these CBSE Class 6 Science Assertion & Reason updated for 2026-27?
Yes, all content at eBookPublisher is updated as per the latest 2026-27 CBSE syllabus.
How many chapters are in CBSE Class 6 Science?
All chapters of CBSE Class 6 Science are covered at eBookPublisher with free Assertion & Reason for each chapter.
Can I study Materials Around Us online for free?
Yes, complete Assertion & Reason for Materials Around Us is available free at eBookPublisher. Study online directly — no download needed.
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