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

Related Mcqs:

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 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...

The rate of energy emission from unit surface area through unit solid angle, along a normal to the surface, is known as ________________?

A. emissivity B. transmissivity C. reflectivity D. intensity of radiation E. absorptivity...

The concept of overall coefficient of heat transfer is used in case of heat transfer by________________?

A. conduction B. convection C. radiation D. conduction and convection E. convection and radiation...

The ratio of the energy absorbed by the body to total energy falling on it is called_________________?

A. absorptive power B. emissive power C. absorptivity D. emissivity E. none of the above...