Sorting Materials into Groups Class 6 MCQ with Answers

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Practice Sorting Materials into Groups Class 6 MCQs with answers.
Learn material properties, classification, solubility, transparency, and grouping - with instant answers and performance report.

📘 Sorting Materials into Groups Class 6 Questions and Answers
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Quick Revision: Sorting Materials into Groups

  • Objects and Materials: All objects around us are made of one or more materials like wood, metal, plastic, glass, cotton, paper, etc.
  • Properties of Materials: Different materials have different properties that determine their use.
  • Lustre: Shiny appearance of materials. Metals like iron, copper, aluminium, gold have lustre. Non-metals like wood, paper do not.
  • Hardness: Hard materials are difficult to compress or scratch (e.g., iron). Soft materials can be easily compressed or scratched (e.g., cotton, sponge).
  • Soluble/Insoluble: Soluble substances dissolve in water (e.g., salt, sugar). Insoluble substances do not dissolve (e.g., sand, chalk powder).
  • Float/Sink: Materials lighter than water float (e.g., wood, paper, oil). Materials denser than water sink (e.g., iron, stone).
  • Transparency: Transparent materials allow clear visibility (glass, water). Translucent allow partial visibility (oiled paper, frosted glass). Opaque allow no visibility (wood, metal).
  • Grouping Convenience: Grouping materials helps in study, storage, and easy location of objects.

Sorting Materials into Groups Class 6 Questions and Answers (FAQ)

Why do we need to group materials into categories in Class 6 Science?
Grouping materials helps us study their properties systematically, store them conveniently, and locate them easily. For example, all metals can be grouped together because they share similar properties like lustre, hardness, malleability, and conductivity. Grouping also helps us understand why certain materials are used for specific purposes - like why copper is used for electrical wires and wood for furniture.
What are the main properties used to sort materials into groups?
Materials are grouped based on their properties: appearance (lustre/shiny or dull), hardness (hard or soft), solubility in water (soluble or insoluble), floatation (float or sink), transparency (transparent, translucent, or opaque), and response to magnets (magnetic or non-magnetic). These properties help identify materials and determine their uses.
What is the difference between transparent, translucent, and opaque materials?
Transparent materials allow light to pass through completely, so objects can be seen clearly on the other side (glass, water, air). Translucent materials allow only some light to pass through, so objects appear blurred or unclear (butter paper, frosted glass, oiled paper). Opaque materials do not allow any light to pass through, so objects cannot be seen (wood, iron, stone, cardboard).
What is the difference between soluble and insoluble substances?
Soluble substances dissolve completely in water to form a clear solution (salt, sugar, potassium permanganate). Insoluble substances do not dissolve in water and remain as separate particles or settle at the bottom (sand, chalk powder, sawdust). Solubility is an important property used to separate mixtures and identify substances.
Why do some materials float on water while others sink?
Whether a material floats or sinks in water depends on its density compared to water. Materials with lower density than water float (wood, cork, oil, plastic). Materials with higher density than water sink (iron, stone, copper). Interestingly, a steel ship floats because its hollow shape contains air, making its average density less than water, while a solid steel nail sinks.

Chapter Summary: Sorting Materials into Groups

This chapter introduces the concept that objects around us are made from different materials. Materials can be classified based on their properties such as appearance (lustre), hardness, solubility in water, whether they float or sink, and transparency. Metals typically have lustre, are hard, and sink in water. Non-metals like wood and paper are generally non-lustrous, may float, and are opaque.

Materials that dissolve in water are called soluble (salt, sugar), while those that do not are insoluble (sand, chalk). Transparent materials allow light to pass through clearly, translucent materials allow partial passage, and opaque materials block light completely. Grouping materials helps us study their properties systematically and makes everyday storage and identification convenient.

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