SORTING MATERIALS INTO GROUPS

which is the hardest known substance on Earth:-

• diamond

• gold

• all of the above

• none of the above

the substances that dissolve in water are called

• soluble substances

• immiscible substances

• sugar

• water

which is form of matter:-

• washing powder

• solid

• sugar

• plasma

choose the symbol for:- oxygen

• $O_2$

• $H_2O$

• atom

• water

choose the symbol for:- sodium

• Na

• C1

• O

• sodium

choose the following which are soft:-

• satin fabric

• bark of tree

• cushion

• none of the above

choose the following that are hard:-

• bark of tree

• potter's clay

• lampshade

• stone

which is the fourth state of matter:-

• plasma

• solid

• liquid

• none of the above

materials that allow the transfer of heat and electricity are called:-

• conductors

• insulators

• water

• conduction

materials that allow light to pass through it completely:-

• opaque

• transparent

• translucent

• all of the above