SORTING MATERIAL INTO GROUPS

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

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)

Which of the following dissolves in water

• Wood

• A piece of Rock

• A cube of Sugar

• A piece of plastic

Which of the following substance is translucent

• Oily paper

• Plain paper

• White paper

• Coloured paper

Which object is made of glass?

• 
• 
• 
• 

Which of the following materials is not lustrous?

• Gold

• Silver

• Wood

• Diamond

Materials that cannot be compressed easily are called __________

• Soft

• Rough

• Scaly

• Hard

Which of the following statements is not true?

• Materials are grouped for convenience.

• Materials are grouped to study their properties.

• Materials are grouped for fun.

• Materials are grouped according to their uses.