Class 6 Science Chapter 2 Important Question Answers - Sorting Materials into Groups

Very Short Answer Type Questions

Q1: Which criterion can be used to categorize objects?
Ans: Various criteria can be used Like States of Matter, Material Composition etc.

Q2: What are some examples of soft materials?
Ans: Cotton and sponge

Q3: Give an example of a transparent material.
Ans: Glass

Q4: What happens to the appearance of metals when exposed to air and moisture?
Ans: Metals can lose their shine and look dull when exposed to air and moisture.

Q5: What are some objects that float on the surface of water?
Ans: Paper, leaves, and wood

Q6: Define solubility in water.
Ans: Solubility in water refers to the ability of a substance to dissolve completely in water.

Q7: Name a substance that is insoluble in water.
Ans: Sand

Q8: What is the purpose of using transparent containers for biscuits and sweets?
Ans: Transparent containers allow buyers to easily see the contents.

Q9: What is the difference between transparent and opaque materials?
Ans: Transparent materials allow light to pass through, while opaque materials do not.

Q10: Give an example of a translucent material.
Ans: Butter paper

Short Answer Type Questions

Q11: Why is it important to sort materials into groups?
Ans: Sorting materials into groups helps us organize and understand the objects around us based on their properties, which is useful for various purposes such as making choices, understanding their uses, and making informed decisions.

Q12: Explain the difference between transparent and translucent materials.
Ans: Transparent materials allow light to pass through them completely, while translucent materials allow only partial light to pass through.

Q13: Give an example of a material that loses its shine when exposed to air and moisture. Why does this happen?
Ans: Iron is an example of a material that loses its shine when exposed to air and moisture. This happens because iron can rust when it reacts with oxygen and moisture in the air, forming a dull layer of iron oxide on its surface.

Q14: What does the solubility of a substance in water mean?
Ans: Solubility in water refers to the ability of a substance to completely dissolve in water, forming a homogeneous solution.

Q15: Explain why some objects float on the surface of water while others sink.
Ans: Objects float on the surface of water if they are less dense than water. Heavier objects, which have a higher density than water, sink in water due to buoyancy.

Long Answer Type Questions

Q16: Discuss the importance of appearance as a property of materials. Provide examples.
Ans: Appearance is an important property of materials because it helps us identify and differentiate them. For example, metals like gold and copper have a shiny appearance, while wood has a distinct, non-shiny appearance. Appearance also influences our choices in selecting materials for specific purposes.

Q17: Explain the significance of hardness in materials. Provide examples of both soft and hard materials.
Ans: Hardness is significant because it determines how easily a material can be scratched or compressed. For instance, materials like wood and sponge are soft and can be easily scratched, while materials like iron are hard and resistant to scratches.

Q18: Describe the differences between soluble and insoluble substances in water. Provide examples of each.
Ans: Soluble substances completely dissolve in water, forming a homogeneous solution. Examples include salt and sugar. Insoluble substances do not dissolve in water and remain as solid particles. An example of an insoluble substance is sand.

Q19: Explain why some materials are transparent, some are translucent, and others are opaque. Provide real-life examples of each.
Ans: Transparency in materials is determined by their ability to allow light to pass through. Materials like glass are transparent because they allow light to pass through completely. Translucent materials, like butter paper, allow only partial light to pass through. Opaque materials, such as wood, do not allow light to pass through at all.

Q20: Discuss the role of buoyancy in objects floating or sinking in water.
Ans: Buoyancy is the upward force exerted by a fluid (in this case, water) on an object submerged in it. Objects float on the surface of water if they are less dense than water, meaning they displace an amount of water equal to or greater than their own weight. Heavier objects, with higher density than water, sink because they displace less water than their weight. Buoyancy plays a crucial role in determining whether objects float or sink in water.