Heat Transfer

A. directly proportional to the surface area of the body
B. directly proportional to the temperature difference on the two faces of the body
C. dependent upon the material of the body
D. inversely proportional to the thickness of the body
E. all of the above

A. different heat contents
B. different specific heat
C. different atomic structure
D. different temperatures
E. none of the above

A. glass
B. water
C. plastic
D. rubber
E. air

A. composition
B. density
C. porosity
D. structure
E. all of the above

A. it is impossible to transfer heat from low temperature source to t high temperature source
B. heat transfer by radiation requires no medium
C. all bodies above absolute zero emit radiation
D. heat transfer in most of the cases takes place by combination of conduction, convection and radiation
E. rate of heat transfer depends on thermal conductivity and temperature difference

A. proportional of thermal conductivity
B. inversely proportional to k
C. proportional to (k)
D. inversely proportional to k2
E. none of the above

A. I
B. 0.5
C. 2
D. 0.25
E. 4.0

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

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
C. heat conducted in unit time across unit area through unit thickness when a temperature difference of unity is maintained between opposite faces
D. all of the above
E. none of the above

A. steam
B. solid ice
C. melting ice
D. water
E. boiling water