Thermal conductivity of a material may be defined as the________________?

Related Mcqs:

1. 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

2. Unit of thermal conductivity in M.K.S. units is ___________________?

   A. kcal/kg m2 °C
   B. kcal-m/hr m2 °C
   C. kcal/hr m2 °C
   D. kcal-m/hr °C
   E. kcal-m/m2 °C

3. 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

4. Unit of thermal conductivity in S.I. units is__________________?

   A. J/m2 sec
   B. J/m °K sec
   C. W/m °K
   D. A. and C. above
   E. B. and C. above

5. 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

6. Thermal conductivity of air at room temperature in kcal/m hr °C is of the order of__________________?

   A. 0.002
   B. 0.02
   C. 0.01
   D. 0.1
   E. 0.5

7. 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

8. 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

9. Thermal conductivity of glass-wool varies from sample to sample because of variation in ________________ ?

   A. composition
   B. density
   C. porosity
   D. structure
   E. all of the above

10. Thermal conductivity of wood depends on_______________?

    A. moisture
    B. density
    C. temperature
    D. all of the above
    E. none of the above