changes around us

what type of change is the

"rusting of iron"

• physical , reversible

• chemical , irreversible

• physical , irreversible

• chemical , reversible

physical changes are _____________

• always reversible

• always irriversible

• sometimes irreversible but most of the time , reversible

• some times reversible but most of the time , irreversible

is growth of weeds an desirable change?

• Yes

• No

• maybe

• none of the above.

the change that occors at regular intervals of times are called _________ changes

Change of milk to curd

• physical

• chemical

• reversible

• irreversible

common mistake growth of weeds are undesirable , because "weeds" mean useless and even harmful plants for vegetation.

• OK.

• WHY?

________________ is an example of desirable change .

• rusting of iron

• breaking of glass

• drying of cloths

• tearing of paper

growth of plants is ________ change

• fast , desirable

• slow , undesirable

• fast , undesirable

• slow , desirable

melting of wax is a _______________ and a physical change

Changing of seasons is a

• periodic

• irreversible

• reversible

• none of the above.