In a ________ ,only physical properties of the substances change.
physical change
chemical change
endothermic change
exothermic change
The changes which occur within a very short time are called____________.
Man-made changes
Natural changes
Fast changes
Slow changes
The changes which are brought and controlled by man are called__________.
Natural Changes
Fast change
desirable change
The change which can be reversed by reversing the conditions is called_____________.
reversible changes
Irreversible changes
desirable changes
Undesirable changes
The changes which takes longer time to occur are called__________.
Undesirable changes.
