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WorksheetsChapter 12 : Heat Conduction and Thermal Expansion
Total questions: 12
Worksheet time: 12mins
Hot coffee is stirred with a spoon, the spoon gets hot due to
Convection
Conduction
Radiation
Two uniform copper rods R and S are joined and are well insulated as shown in the diagram above. The length of rod R is twice that of rod S but the cross-sectional area of rod R is half that of rod S. What is the temperature at the joint of rod R and rod S?
60°C
67°C
75°C
90°C
If the area through which heat is transferred is increased by a factor of 2, then the rate of heat transfer is increased by .................
a factor of 4
a factor of 1/2
a factor of 2
a factor of 1
Units for thermal conductivity is .....
J kg-1 K-1
J mol-1 K-1
W mol-1 K-1
W m-1 K-1
The joined rod is lagged and the opposite ends are kept at 100°C and 0°C. The thermal conductivity of metal Y is twice that of X. What is the temperature at the junction?
20°C
40°C
50°C
80°C
What is Thermal expansion?
The transfer of thermal energy between materials by the collisions of particles
Is a decrease in a materials size when temperature decreases
An increase in a materials size when temperature increases
Chicken fried rice
Coefficient of linear expansion, Coefficient of area expansion and Coefficient of volume expansion have the unit of....
oC-1
oC
W m-1 oC-1
J m-1 oC-1
The length of copper wire at 20oC is 4.5m. Calculate its new length when the temperature is 95oC. Given α = 1.7×10-5 oC-1
4.55m
5.41m
5.11m
4.51m
Thermal expansion of liquid depends on the expansion of the container that it fills. However, why does liquid overflow after heating?
because container does not expand
because coefficient of volume expansion for liquid is bigger than the container
because liquid and container expand at the same amount
because particles in solid container is more closely packed together than liquid
