A. directly proportional to thermal con¬ductivity
B. inversely proportional to density of substance
C. inversely proportional to specific heat
D. all of the above
E. none of the above
Related Mcqs:
- Thermal diffusivity of a substance is ____________________?
A. proportional of thermal conductivity
B. inversely proportional to k
C. proportional to (k)
D. inversely proportional to k2
E. none of the above - Thermal diffusivity is ____________________?
A. a dimensionless parameter
B. function of temperature
C. used as mathematical model
D. a physical property of the material
E. useful in case of heat transfer by radiation - Unit of thermal diffusivity is_________________?
A. m2/hr
B. m2/hr°C
C. kcal/m2 hr
D. kcal/m.hr°C
E. kcal/m2 hr°C - Thermal conductivity of non-metallic amorphous solids with decrease in temperature __________________?
A. increases
B. decreases
C. remains constant
D. may increase or decrease depending on temperature
E. unpredictable - Thermal conductivity of solid metals with rise in temperature normally___________________?
A. increases
B. decreases
C. remains constant
D. may increase or decrease depending on temperature
E. unpredictable - Thermal conductivity of water in general with rise in temperature ____________________?
A. increases
B. decreases
C. remains constant
D. may increase or decrease depending on temperature
E. none of the above - Thermal conductivity of air with rise in temperature__________________?
A. increases
B. decreases
C. remains constant
D. may increase or decrease depending on temperature
E. none of the above - Thermal conductivity of water at 20°C is of the order of_____________________?
A. 0.1
B. 0.23
C. 0.42
D. 0.51
E. 0.64 - The ratio of heat flow Q1/Q2 from two walls of same thickness having their thermal conductivities as ATj – 2K2 will be ________________?
A. I
B. 0.5
C. 2
D. 0.25
E. 4.0 - Thermal conductivity of wood depends on_______________?
A. moisture
B. density
C. temperature
D. all of the above
E. none of the above
