The emissive power of a body depends upon its___________________?

Related Mcqs:

1. The ratio of the emissive power and absorptive power of all bodies is the same and is equal to the emissive power of a perfectly black body. This statement is known as_________________?

   A. Krichoff’s law B. Stefan’s law C. Wien’ law D. Planck’s law E. Black body law...

2. According to Kirchoff’s law, the ratio of emissive power to absorptivity for all bodies is equal to the emissive power of a _________________?

   A. grey body B. brilliant white polished body C. red hot body D. black body E. none of the above...

3. The value of the wavelength for maximum emissive power is given by ___________________?

   A. Wien’s law B. Planck’s law C. Stefan’s law D. Fourier’s law E. Kirchhoff’s law...

4. If the temperature of a solid surface changes form 27°C to 627°C, then its emissive power changes in the ratio of___________________?

   A. 3 B. 6 C. 9 D. 27 E. 81...

5. When heat is transferred form hot body to cold body, in a straight line, without affecting the intervening medium, it is referred as heat transfer by __________________?

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

6. Emissivity of a white polished body in comparison to a black body is________________?

   A. higher B. lower C. same D. depends upon the shape of body E. none of the above...

7. 40% of incident radiant energy on the surface of a thermally transparent body is reflected back. If the transmissivity of the body be 0.15, then the emissivity of surface is____________________?

   A. 0.45 B. 0.55 C. 0.40 D. 0.75 E. 0.60...

8. The total emissivity power is .defined as the total amount of radiation emitted by a black body per unit_______________?

   A. temperature B. thickness C. area D. time E. area and time...

9. Thermal conductivity of wood depends on_______________?

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

10. The amount of radiation mainly depends on___________________?

    A. nature of body B. temperature of body C. type of surface of body D. all of the above E. none of the above...