When a candle burns,
Physical change occurs
Chemical change occurs
Both the changes occur
None of these changes occur
Which one of the following is a reversible change?
Ripening of fruits
Curdling of milk
Folding of paper
Burning of paper
Which statement is true in the case of a physical change?
Burning is one example
It alters the form of appearance of a substance
It changes a substance into a different substance
More than one substance must be present
Tearing of paper is a
physical change
chemical change
irreversible change
none of these changes
Which of the following is a physical change ?
Melting of ice
Melting of wax
Formation of steam from water
All of these
Sublimation of iodine is an example of ______ change .
physical
chemical
exothermic
none of these
Expansion and contraction is done by
heating
mixing
cooling
both heating and cooling
In which one of the following examples heat produces no change in chemical composition?
Burning of magnesium
Decomposition of zinc carbonate
Burning of Sulphur
Magnetization of iron piece
Which type of change occurs when the size,shape,appearance or volume of a substance is changed without changing its composition?
Chemical
Physical
Nuclear
Which of the following is a chemical change ?
Germination of seed
Formation of coal from the wood
