Sorting of Materials into groups. Assignment. Q1. Why is classification of
materials done? Ans. Classification of materials is done to make their study
easier and ...
BAL BHARATI PUBLIC SCHOOL, PITAMPURA, DELHI-110034 Class- 6 Sorting of Materials into groups Assignment Q1. Why is classification of materials done? Ans. Classification of materials is done to make their study easier and also easier to locate them. Q2. How is the classification of materials done? Ans. Classification of materials is done on the basis of similarities in dissimilarities in properties. Q3. How do you differentiate between hard & soft materials? Ans. Hard Materials: Those materials which cannot be compressed or scratched easily are called hard materials. Soft Materials: Those materials which can be compressed or scratched easily are called soft materials. Q4. What do you mean by lusture? Ans. Those materials which have a shiny appearance are said to have a lusture. Q5. Classify the following as soluble or insoluble in water: Ans. Milk Soluble Plastic Insoluble Sand Insoluble Alcohol Soluble Potassium permanganate Soluble Glass Insoluble Q6. How does water play an important role in the functioning of our body? Ans. Water plays an important role in the functioning of our body as it can dissolve a large number of substances in it. Q7. How is oxygen gas dissolved in water helpful? Ans. Oxygen gas dissolved in water is important for the survival of aquatic plants and animals as they use it for respiration. Q8. Name any two gases which are soluble in water. Ans. Oxygen and Carbon dioxide Q9. Name any two gases which are insoluble in water. Ans. Nitrogen and methane
Q10. How are transparent materials different from opaque materials? Ans. Transparent Materials: Those materials through which we can see clearly are called transparent materials. Example: water Opaque Materials: Those materials through which we cannot see at all are called opaque materials. Example: wood. Q11. Classify the following as transparent, translucent or opaque: Ans. Butter paper Translucent Ground glass Translucent Clear glass Transparent Aluminium sheet Opaque Air Transparent Water Transparent Cardboard Opaque
