Which of the following is a physical change ?
Melting of ice
Melting of wax
Formation of steam from water
All of these
The changing of the solid directly into vapors on heating and vapors into solid on cooling.
Evaporation
Sublimation
Condensation
Radiation
Which one of the following is a reversible change?
Ripening of fruits
Curdling of milk
Folding of paper
Burning of paper
Melting of ice causes difference in:
position
state
internal structure of particles
none of these
Which type of change occurs when the size,shape,appearance or volume of a substance is changed without changing its composition?
Chemical
Physical
Nuclear
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 an example of physical change in nature?
Chemical weathering
Nitrogen cycle
Erosion
Carbon cycle.
A chemical change is also known as
Physical reaction
Nuclear reaction
Chemical reaction
None of these
Expansion and contraction is done by
heating
mixing
cooling
both heating and cooling
Which one of the following is NOT a physical change?
Mixing salt and pepper
Mixing salt and water
Mixing sugar and water
Mixing sand and iron nails
