________ was developed by French Scientist Louis Pasteur.
Pasteurization
Sterilisation
lyophilisation
None of these
Growing of plant into a tree is a __________ change.
Chemical
Physical
Desirable
Permanent change.
Formation of day and night is a _________ change.
slow
Fast
man made
none of these
A change harmful to us is a _______ change.
Undesirable
Slow
Ripening of fruits is a __________ change.
Natural
Reversible change
The curdling of milk is a
Natural change
Man made change
Both A$B
Desirable change
Change of seasons is a _________ change.
natural
one of these
A change which is useful to us is a _________ change.
desirable
undesirable
fast
The formation of brown powdery material on the surface of iron in the presence of moisture is called
Rusting
Melting
Boiling
Sublimation
Dissolution of solid in liquid (ie sugar in water) is a __________ change.
