Class VI Science • Curiosity
🔩 Chapter 6: Materials Around Us
NCERT Solutions — Complete Question & Answer Guide
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📌 Key Concepts
✦ Objects are made of materials (wood, metal, plastic, glass, etc.)
✦ Lustrous = shiny surface (metals); Non-lustrous = dull surface
✦ Hard (diamond, iron) vs Soft (cotton, sponge)
✦ Transparent (glass), Translucent (oiled paper), Opaque (wood, metal)
✦ Soluble = dissolves in water (salt, sugar); Insoluble = doesn\'t dissolve (sand, oil)
✦ Conductors allow heat/electricity to pass; Insulators do not
✦ Same material can make different objects; same object can be made from different materials
📝 Let Us Enhance Our Learning
Q1 Classify as transparent, translucent, or opaque: Glass, Wood, Oiled paper, Cardboard, Clean water, Frosted glass, Brick, Air.
ANSWER| Transparent | Translucent | Opaque |
|---|
| Glass, Clean water, Air | Oiled paper, Frosted glass | Wood, Cardboard, Brick |
Q2 What is the difference between lustrous and non-lustrous materials?
ANSWER| Feature | Lustrous | Non-lustrous |
|---|
| Surface | Shiny, reflects light | Dull, does not shine |
| Examples | Gold, Silver, Iron, Copper | Wood, Paper, Rubber, Cloth |
Most metals are lustrous.
Q3 Classify as soluble or insoluble in water: Salt, Sand, Sugar, Chalk powder, Lemon juice, Oil, Vinegar.
ANSWER| Soluble in water | Insoluble in water |
|---|
| Salt, Sugar, Lemon juice, Vinegar | Sand, Chalk powder, Oil |
Q4 What are transparent, translucent, and opaque materials?
ANSWERTransparent: Materials that allow all light to pass through. Objects can be seen clearly. Example: Glass, water, air.
Translucent: Materials that allow some light to pass. Objects appear blurry. Example: Oiled paper, frosted glass.
Opaque: Materials that allow no light to pass. Objects cannot be seen through them. Example: Wood, metal, brick.
Q5 How can the same material be used to make different objects?
ANSWERA single material can be shaped or processed into many different objects.
Example: Wood can make a table, chair, door, bat, pencil. Metal (steel) can make spoon, knife, utensils, car parts, bridge.
Q6 Can the same object be made from different materials? Give examples.
ANSWERYes! The same object can be made from different materials depending on the purpose.
Example: A plate can be made from steel, glass, plastic, paper, or banana leaf. A chair can be made from wood, metal, or plastic.
Q7 What is the difference between hard and soft materials?
ANSWER| Hard Materials | Soft Materials |
|---|
| Difficult to scratch or compress | Easy to scratch, compress, or bend |
| Diamond, Iron, Stone, Glass | Cotton, Sponge, Rubber, Wool |
Q8 What are conductors and insulators?
ANSWERConductors: Materials that allow heat and electricity to pass through. Examples: Iron, Copper, Aluminium, Silver.
Insulators: Materials that do not allow heat and electricity to pass. Examples: Wood, Rubber, Plastic, Glass.
Why it matters
Electrical wires use copper (conductor) inside and plastic (insulator) outside for safety.