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

Related Mcqs:

1. 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

2. 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

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. 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

5. 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

6. 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

7. 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

8. Thermal conductivity of a material may be defined as the________________?

   A. quantity of heat flowing in one second through one cm cube of material when opposite faces ^re maintained at a temperature difference of 1°C
   B. quantity of heat flowing in one second through a slab of the material of area one cm square, thickness 1 cm when its faces differ in temperature by 1°C
   C. heat conducted in unit time across unit area through unit thickness when a temperature difference of unity is maintained between opposite faces
   D. all of the above
   E. none of the above

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