43. Temperature of steam at around 540°C can be measured by
A.Thermometer
B.Thermistor
C.Thermocouple
D.Thermopile

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44. If the temperature of a solid surface changes form 27°C to 627°C, then its emissive power changes in the ratio of
A.3
B.81
C.9
D.27

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45. Thermal conductivity of water at 20°C is of the order of
A.0.1
B.0.23
C.0.42
D.0.51

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46. Heat flows from one body to other when they have
A.Different heat contents
B.Different specific heat
C.Different atomic structure
D.Different temperatures

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47. The concept of overall coefficient of heat transfer is used in heat transfer problems of
A.Conduction
B.Convection
C.Radiation
D.Conduction and convection

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48. Total emissivity of polished silver compared to black body is
A.Same
B.Higher
C.More or less same
D.Very much lower

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49. The amount of heat flow through a body by conduction is
A.Directly proportional to the surface area of the body
B.Dependent upon the material of the body
C.Inversely proportional to the thickness of the body
D.All of the above

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