A. nature of body
B. temperature of body
C. type of surface of body
D. all of the above
E. none of the above
Related Mcqs:
- 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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 - Thermal conductivity of wood depends on_______________?
A. moisture
B. density
C. temperature
D. all of the above
E. none of the above - 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
