The changes which do not repeat themselves at regular intervals of time are called __________ changes.
Non periodic
Periodic
Both A$B
None of these
From the below changes which change gives us harmful effects?
Flood
Ripening of fruits
Fermentation of rice dough
Decaying of organic wastes into organic manure
Which of these statements is FALSE?
A reversible reaction produces new materials.
Chemical changes are usually irreversible.
Physical changes are usually reversible.
Sublimation is a ___________ change.
Physical
Chemical
Desirable
Dissolution of common salt is a ________ change.
The changes that occur in nature on their own are called:
Natural
Man made
The changes which occur in a short period is known as a__________ change.
Fast
Slow
Pick the odd one out.
Rain fall
Construction of roads
Change of day and night
The changes which repeat themselves at regular intervals of time are called __________ changes.
Heart beat is a _________ change.
None periodic
Reversible
