Chapter 4 sorting materials into groups

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

• Rubber

• Plastic

• Wood

• Tin

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.

A mirror is

• opaque.

• transparent

• translucent.

• flexible

Which one of these is NOT a type of metal

• Copper

• Gold

• Aluminum

• Nitrogen

Which type of the following materials is used for making the front glass (wind screen) of a car?

• Transparent

• Translucent

• Opaque

• None of the above

Which of the following substance is opaque?

• Wood

• Glass container

• Oily paper

• Water

What will happen to these cubes of ice when they melt?

• Turn into a solid.

• Turn into a gas.

• Turn into a liquid.

• Nothing, they will not melt.

Find the odd one out from the following.

• A) Iron Nail

• B) Utensils

• C) Magnet

• D) Glass beaker

Which of the following is correct for the term ' lustre '?

• A) Hardness

• B) Softness

• C) Dull appearance

• D) Shiny appearance