Physics
Fill in the blanks:
(a) Evaporation takes place at …………… temperatures.
(b) …………… process is just the reverse of melting.
(c) …………… is a process that involves direct conversion of a solid into its vapour on heating.
(d) The temperature at which a solid converts into a liquid is called its …………… .
(e) The smallest unit of matter that exists freely in nature is called …………… .
(f) Molecules of a substance are always in a state of …………… and so they possess …………… .
(g) Inter-molecular space is maximum in …………… less in …………… and the least in …………… .
(h) Inter-molecular force of attraction is maximum in …………… , less in …………… and the least in …………… .
Matter
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Answer
(a) Evaporation takes place at all temperatures.
(b) Freezing process is just the reverse of melting.
(c) Sublimation is a process that involves direct conversion of a solid into its vapour on heating.
(d) The temperature at which a solid converts into a liquid is called its melting point.
(e) The smallest unit of matter that exists freely in nature is called molecule.
(f) Molecules of a substance are always in a state of motion and so they possess kinetic energy.
(g) Inter-molecular space is maximum in gases less in liquids and the least in solids.
(h) Inter-molecular force of attraction is maximum in solids, less in liquids and the least in gases.
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Related Questions
Assertion (A) : We often pour tea in a saucer to cool it faster.
Reason (R) : Evaporation takes place at all temperatures.
- Both A and R are true and R is the correct explanation of A
- Both A and R are true and R is not the correct explanation of A
- Assertion is true but reason is false
- Assertion is false but reason is true
Assertion (A) : The molecules in a liquid can move within the boundary of the vessel.
Reason (R) : A liquid has a definite volume and a definite shape.
- Both A and R are true and R is the correct explanation of A
- Both A and R are true and R is not the correct explanation of A
- Assertion is true but reason is false
- Assertion is false but reason is true
Write true of false for each statement:
(a) The temperature of a substance remains unaffected during its change of state.
(b) Ice melts at 100°C.
(c) Water at 100°C has more heat than steam at 100°C.
(d) Evaporation of a liquid causes cooling.
(e) Water evaporates only at 100°C.
(f) Boiling takes place at all temperatures.
(g) Evaporation takes place over the entire mass of the liquid.
(h) The process of a gas converting directly into solid is called vaporization.
(i) At high altitudes, water boils above 100°C.
(j) The melting point of ice is 0°C.
Match the following
Column A Column B (a) Molecules (i) water boils (b) 100°C (ii) evaporation (c) 0°C (iii) changes from solid to gas (d) At all temperatures (iv) matter (e) Camphor (v) water freezes