The bacteria which is involved in curdling of milk is:
Bacillus acid lactici
Strepto cocci
Bacillus cereus
None of these
The change which can be reversed by changing the condition is known as ________ change.
Reversible
Irreversible
Endothermic
________ was developed by French Scientist Louis Pasteur.
Pasteurization
Sterilisation
Syophilisation
Ripening of fruits is a __________ change.
Undesirable
Desirable
Natural
___________ is the conversion of a liquid into its vapour state at any temperature below its boiling point.
Evoporation
Boiling
Condensation
Some changes are __________ at one time but _________ at another time.
Desirable, Undesirable
Man made, desirable
Slow, undesirable
Fast
The change which takes longer time to occur is called a ___________ change.
Slow
Man made
Dissolution of common salt is a ________ change.
Physical
Chemical
Non periodic
What new materials are formed when a candle burns?
Melted wax
Water and carbon dioxide and soot
No new materials are formed
Why is nothing left behind when distilled water is evaporated?
Because nothing was dissolved in it
Because anything that was dissolved has evaporated
Because nothing can dissolve in water
