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

Short Answer Questions

Q1: What are the three main states of matter?
Ans: The three main states of matter are solids, liquids, and gases.

Q2: Name a material that is a good conductor of heat.
Ans: Copper is a good conductor of heat.

Q3: What property of materials determines whether they float or sink in water?
Ans: Density is the property that determines whether materials float or sink in water.

Q4: Which materials are good conductors of electricity?
Ans: Most metals are good conductors of electricity.

Q5: Give an example of a material that is both a good conductor of heat and electricity.
Ans: Silver is an example of a material that is a good conductor of both heat and electricity.

Long Answer Questions

Q1: How are solutions formed, and can you provide an example of a solution?
Ans: Solutions are formed when a substance (solute) dissolves in a liquid (solvent) to create a homogeneous mixture. For instance, when you dissolve sugar (solute) in water (solvent) and mix it thoroughly, you create a sugar solution, where the sugar is evenly distributed in the water, resulting in a clear and uniform liquid.

Q2: Explain the properties of materials that make them good conductors of heat.
Ans: Good conductors of heat have high thermal conductivity, which means they can efficiently transfer heat. For example, metals like copper have closely packed atoms and free electrons that allow them to rapidly transfer heat from one point to another, making them good conductors of heat.

Q3: What properties of materials determine whether they will float or sink in water? Provide an example of each.
Ans: Whether a material floats or sinks in water depends on its density compared to the density of water. For example, a wooden log, being less dense than water, will float. In contrast, a metal object like a steel nail, which is denser than water, will sink.

Q4: Why is it important to classify materials based on their properties? Offer an example to illustrate the significance of such classification.
Ans: Classifying materials based on their properties is crucial as it helps us understand their behaviors and select the right material for specific purposes. For instance, metals like copper, aluminum, and iron are classified together because they share properties like being hard, good conductors of heat and electricity, and having high melting points. This classification is valuable because it guides us in choosing the appropriate material for various applications, such as using copper for electrical wiring.

Q5: Explain why wooden boats are a popular choice for boat construction, emphasizing the key property of wood that makes it suitable for this purpose.
Ans: Wooden boats are favored for construction because wood has lower density than water, making it buoyant and allowing boats to float. Additionally, wood is durable and can resist water damage when treated or coated. The combination of buoyancy, durability, and workability makes wood a practical material for boat construction, ensuring that boats can remain afloat and withstand the challenges of a water environment.