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Physics 9 Chapter 8 - Thermal Properties of Matter -17
1.
In central heating systems, which of the following is used to carry thermal energy through pipes from boiler to radiators?
a) Cold water
b) Hot water
c) Hot gas
d) Cold gas
2.
A container has 2.5 litres of water at 20°C. How much heat is required to boil the water?
a) 80 J
b) 84 000 J
c) 840 000 J
d) 4200 J
3.
What is the quantity of thermal energy absorbed by a body for one kelvin (1 K) increase in its temperature called?
a) Latent heat of fusion
b) Specific heat capacity
c) Heat capacity
d) Latent heat of vaporization
4.
Which of the following material has large specific heat?
a) Mercury
b) Ice
c) Water
d) Copper
5.
What is the formula for heat capacity of a substance?
a) Heat capacity = m / c
b) Heat capacity = m - c
c) Heat capacity = m + c
d) Heat capacity = mc
6.
What is the heat capacity of 5 Kg of water?
a) 2100 JK
-1
b) 4200 JK
-1
c) 21000 JK
-1
d) 42000 JK
-1
7.
How much heat is required to increase the temperature of 0.5kg of water from 10
o
C to 65
o
C?
a) 1155 J
b) 115500 J
c) 11.550 J
d) 11550 J
8.
Matter can be changed from one state to another, when................?
a) Both b and c
b) Light energy is added to a substance
c) Thermal energy is added to a substance
d) Thermal energy is removed from a substance
9.
At which temperature, ice begins to melt?
a) 100
o
C
b) 50
o
C
c) 32
o
C
d) 0
o
C
10.
At which temperature, water begins to boil?
a) 32
o
C
b) 50
o
C
c) 100
o
C
d) 0
o
C
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