Which of the following is expected to have highest thermal conductivity_______________?

Related Mcqs:

1. Which of the following has maximum value of thermal conductivity________________?

   A. aluminium B. steel C. brass D. copper E. lead...

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. 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...

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 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 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...

7. 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...

8. 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...

9. Thermal diffusivity of a substance is __________________?

   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...

10. The thermal diffusivities for gases are generally_____________________?

    A. more than those for liquids B. less than those for liquids C. more than those for solids D. dependent on the viscosity E. same as for the liquids...