The amount of radiation mainly depends on___________________?

Related Mcqs:

1. Heat transfer by radiation mainly depends upon___________________?

   A. its temperature B. nature of the body C. kind and extent of its surface D. all of the above E. none of the above...

2. 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...

3. Which of the following is the case of heat transfer by radiation ___________________?

   A. blast furnace B. heating of building C. cooling of parts in furnace D. heat received by a person from fireplace E. all of the above...

4. Heat is transferred by all three modes of transfer, viz, conduction, convection and radiation in _________________?

   A. electric heater B. steam condenser C. melting of ice D. refrigerator condenser coils E. boiler...

5. Two balls of same material and finish have their diameters in the ratio of 2 : 1 and both are heated to same temperature and allowed to cool by radiation. Rate of cooling by big ball as compared to smaller one will be in the ratio of____________________?

   A. 1 :1 B. 2: 1 C. 1 : 2 D. 4 : 1 E. 1 : 4...

6. According to Stefan’s law, the total radiation from a black body per second per unit area is proportional to____________________?

   A. absolute temperature B. T2 C. T5 D. t E. l/T...

7. Two plates spaced 150 mm apart are maintained at 1000°C and 70°C. The heat transfer will take place mainly by ___________________?

   A. convection B. free convection C. forced convection D. radiation E. radiation and convection...

8. Heat flowing from one side to other depends directly on ___________________?

   Pick up the wrong case? A. face area B. time C. thickness D. temperature difference E. thermal conductivity...

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 emissive power of a body depends upon its___________________?

    A. temperature B. wave length C. physical nature D. all of the above E. none of the above...