Answer The Following Questions In Short.[2 Marks Each]

Question 12 Marks

Classify the following materials into soluble in water and insoluble in water: Sugar, glass, iron powder, alum, saltpetre, sulphur, washing soda, iodine, lemon salt, oil, honey, plastic.

Answer

$(1)$ Soluble in water: Sugar, alum, saltpetre, washing soda, lemon salt, honey.
$(2)$ Insoluble in water: Glass, iron powder, sulphur, iodine, oil, plastic.

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Question 22 Marks

Classify the following materials into transparent, opaque and translucent: Wood, spectacle lens, muddy water, iron, water, frosted glass, fog, air, brick, stone.

Answer

$(1)$ Transparent matçrials: Spectacle lens, water, air.
$(2)$ Opaque materials : Wood, brick, stone, iron.
$(3)$ Translucent materials : Muddy water, frosted glass, fog.

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Question 32 Marks

Explain giving scientific reasons: The showcases kept in shops have glass doors.

Answer

Glass is a transparent material. If the shutters of the showcases are made of glass, the goods that are kept in the showcase can be easily seen without even opening the shutter. Hence, the costumer can easily see the available product and the shopkeeper can easily sell it.

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Question 42 Marks

What are the benefits of grouping materials?

Answer

Grouping materials has the following benefits:
$(1)$ Similar objects are placed together, making them easier to locate.
$(2)$ Dividing materials into groups makes it easier to study their properties.
$(3)$ Grouping also helps to study the patterns in the properties of the material.
$(4)$ It becomes easy to take stock of the materials. Also can get information about the shortfall of the materials.

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Science Answer The Following Questions In Short.[2 Marks Each]

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