Sorting materials into groups

Which of the following materials is hard, opaque and shines?

• Rubber

• Plastic

• Wood

• Tin

Which property of clay is useful for making pots and bricks?

• Opacity

• Non-magnetic nature

• A good conductor of heat

• malleability

Which of the following materials is suitable to make raincoats?

• Cotton

• Plastic

• Silk

• Paper

Why are most of the balloons, tyres and footballs made of rubber?

• It is naturally available.

• It is cheap.

• It is an electrical insulator.

• It is soft and flexible.

If opacity is the distinct feature of wood, then what is glass known for in the same way?

• Its transparency

• Its magnetic nature

• Its conductivity to heat

• Its lustrous nature

A mirror is

• opaque.

• transparent

• translucent.

• flexible

When Amrita was asked to pick up a few articles from a collection, she picked up the following:

Wooden scale

Glass test tube

Paper basket

Which of the following articles is she most likely to pick up the next

• Steel cup

• Iron chain

• Rubber gloves

• Copper wire

Which characteristics given below are of metals?

(i) They are hard.

(ii) They have lustre.

(iii) They are good conductors of electricity

• Only (i) and (ii

• Only (ii) and (iii)

• Only (i) and (iii)

• i), (ii) and (iii)

Why are paper bags preferred over plastic bags?

• Paper bags are lighter.

• Paper bags are stronger.

• Paper bags are cheap

• Paper bags are biodegradable.

A vendor sells white powdered salt mixed with white powdered stone. Which of these properties will help you detect his malpractice?

• Ductility

• Opacity

• Density

• Solubility