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Physics 9 Chapter 8 - Thermal Properties of Matter -24
1.
What is the time taken by water at 100°C to change into steam?
a) 24.4min
b) 36.4 min
c) 26.4 min
d) 56.4 min
2.
What is the latent heat of vaporization of water found by the experiment?
a) 3.23 x10
6 J kg
-1
b) 2.33 x10
6 J kg
-1
c) 3.33 x10
6 J kg
-1
d) 2.23 x10
6 J kg
-1
3.
What is the process of changing of a liquid into vapours from the surface of the liquid without heating it called?
a) Boiling
b) Evaporation
c) Melting
d) Circulation
4.
At what temperature the process of boiling takes place?
a) Melting point
b) Fusion point
c) Boiling point
d) Freezing point
5.
At ...................., a liquid changes into vapours?
a) Fusion point
b) Boiling point
c) Freezing point
d) Melting point
6.
Which of the following affects evaporation?
a) All of these
b) Wind
c) Temperature
d) Nature of the liquid
7.
Wet clothes .......................when spread up?
a) Dry up
b) No effect
c) Becomes more wet
d) Remains wet
8.
What does evaporation causes?
a) Heating
b) Cooling
c) None of these
d) Increase in temperature
9.
Which of the following affects evaporation?
a) Wind
b) Temperature
c) All of these
d) Surface area of the liquid
10.
What is the time taken to heat water from 0°C to 100°C?
a) 4.6 min
b) 2.6 min
c) 3.6 min
d) 5.6 min
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