sorting materials into groups

what makes the basis of sorting materials into groups ?

• Similarities in their properties

• Differences in their properties

• Both the above

Which one will show a metallic lustre ?

• Any surface of a metal

• Freshly cut surface of a metal

• Surface of all materials

purpose of sorting materials into groups is

• to study their property

• convenience

• both the above

which of the following has reddish brown colour ?

• gold

• iron

• copper

• brass

Materials that cannot be compressed easily are called --------materials

• soft

• rough

• scaly

• hard

nails are made up of metal because it

• is shiny

• does not bend easily

• rusts

wood is used for matches because it

• rots

• burns

• floats

which object shines ?

• plastic toy

• cotton shirt

• steel spoon

• stone piece

which is the hardest material among the following ?

• sponge

• iron

• rubber

• wood

which is the softest material among the following ?

• stone

• wood

• rubber

• sponge