B. density

C. none of the above

D. temperature

E. moisture

A. glass

C. plastic

D. rubber

E. water

A. varies with temperature

B. does not vary with temperature and. wavelength of the incident ray

C. varies with wavelength of the incident ray

E. none of the above

A. increases

B. unpredictable

C. remains constant

E. may increase or decrease depending on temperature

A. convection and radiation

B. radiation

C. convection

D. scattering

A. first law of thermodynamic

B. zeroth law of thermodynamics

D. Kirchoffs law E. Stefans law

B. Black body law

C. Wien law

D. Stefans law

E. Plancks law

A. a complete separation between hot and cold fluids

B. generation of heat again and again

C. direct mixing of hot and cold fluids

D. indirect transfer

A. wave length

B. physical nature

D. temperature

E. none of the above

A. more or less same

B. very much higher

C. higher

D. same

A. thermal conductivity

C. thermal diffusivity

D. dynamic viscosity

E. kuiematic viscosity

A. reflected

B. transmitted

C. refracted

D. partly reflected and partly absorbed

A. kacl/m hr C

B. kcal/hr C

C. kcal/m3 hr C

E. kcal/m2

A. 1.7

B. 10.5

C. 0.1

E. 0.3

A. conduction

B. convection

C. convection and radiation combined

E. conduction and radiation combined

A. absolute temperature

C. cube of absolute temperature

D. square of temperature

E. fourth power of temperature

A. grey body

B. brilliant white polished body

C. none of the above

E. red hot body

A. p=l,x = 0anda = 0

C. p = 0, x = 0 and a = 1

D. a=0,x + p= 1.

E. p = 0, x = 1 and a = 0

A. 3

B. 6

C. 9

D. 27

A. Plancks law

B. Stefans law

C. Kirchhoffs law

E. Fouriers law

B. I2

C. t

D. f

E. 1/r

A. free convection

B. radiation and convection

C. convection

E. forced convection

B. absorptivity

C. none of the above

D. emissive power

E. emissivity

B. a = 0, x + p = 1.

C. p = 0, x = 1 and a = 0

D. p = 0, x = 0 and a = 1

E. x = 0, a + p = 1

A. T2

B. l/T

C. absolute temperature

D. T5

A. 0.75

C. 0.6

D. 0.4

E. 0.55

A. transmits all heat radiations

C. fully opaque

D. reflects all heat

E. is black in colour

B. none of the above

C. Prandtl no. and Reynold no

D. Grashoff no. and Reynold no

E. Grashoff no., Prandtl no and Reynold no

A. temperature

B. area and time

C. area

E. thickness

A. less than those for liquids

C. same as for the liquids

D. dependent on the viscosity

E. more than those for solids

A. varies with the wave length of incident ray

B. there is no such criterion

C. varies with both

D. varies with temperature

A. watt/cm4 K

B. watt2/cm K4

D. watt/cm2 K2

E. watt/cm2 K

B. x = 0, a + p = 0

C. p= l,T = 0anda = 0

D. p = 0, x = 1 and a = 0

E. a = 0,x + p= 1.

F. re a = absorptivity, p == reflectivity, X = transmissivity

A. less

B. same

D. depends on other factors

E. none of the above

A. zerci

B. less than those for gases

D. more or less same as for liquids and gases

E. jess than those for liquids

A. a = 0,x + p= 1

C. p = 0, x = 0 and a = 1

D. p=l,x = 0,anda = 0

E. X = 0, a + p = 1

A. universal gas constant

C. none of the above

D. kinematic viscosity

E. thermal conductivity

A. at all temperatures

B. at one particular temperature

C. at critical temperature

D. for a polished body

A. all coloured bodies

B. polished bodies

C. none of the above

D. all of the above

A. none of the above

B. temperature of body

D. type of surface of body

E. nature of body

A. inversely proportional to density of substance

B. inversely proportional to specific heat

C. directly proportional to thermal conductivity

E. none of the above

A. longer wavelength

B. wavelength has nothing to do with it

C. none of the above

E. remains same at all wavelengths