A) temporary, reversible and a new substance is produced
B) always accompanied by exchange of light
C) permanent, irreversible and a new substance is produced
D) never accompanied by exchange of light and heat energy
A solid has _________.
A) maximum intermolecular space
B) definite mass but no definite volume
C) very high compressibility
D) maximum intermolecular force of attraction
A solid that sublimes on heating is _________.
A) sodium chloride
B) copper sulphate
C) lead sulphate
D) ammonium chloride
Matter changes from one state to another with change in _________.
A) density
B) temperature
C) volume
D) height
For any substance the temperature remains same during the change of state due to ___________.
A) loss of heat
B) latent heat
C) less supply of heat
D) lattice energy
Temperature is a measure of ___________.
A) total kinetic energy of molecules
B) total potential energy of molecules
C) average potential energy of molecules
D) average kinetic energy of molecules
When we blow air into the balloon it inflates because:
A) Air particles diffuse into the balloon
B) Air particles collide with the walls of the balloon and exert pressure on them
C) Rubber is elastic in nature
D) The temperature of air in the balloon increases
As solid melts to form liquid:
A) Inter particle distance increases
B) Inter molecular forces of attraction decrease
C) Compressibility increases
D) All of the above
An example of a chemical change is ________.
A) formation of clouds
B) glowing of an electric light
C) dropping sodium into water
D) dissolving of salt in water
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