A. 0.1
B. 0.3
C. 0.7
D. 1.7
E. 10.5

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Related Mcqs:

  1. Thermal conductivity of air at room temperature in kcal/m hr °C is of the order of__________________?
    A. 0.002 B. 0.02 C. 0.01 D. 0.1 E. 0.5...
  2. Thermal conductivity of air with rise in temperature__________________?
    A. increases B. decreases C. remains constant D. may increase or decrease depending on temperature E. none of the above...
  3. Which of the following property of air does not increase with rise in temperature ________________?
    A. thermal conductivity B. thermal diffusivity C. density D. dynamic viscosity E. kuiematic viscosity...
  4. Which of the following has least value of conductivity_________________?
    A. glass B. water C. plastic D. rubber E. air...
  5. Which of the following has maximum value of thermal conductivity________________?
    A. aluminium B. steel C. brass D. copper E. lead...
  6. 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...
  7. Unit of thermal conductivity in M.K.S. units is ___________________?
    A. kcal/kg m2 °C B. kcal-m/hr m2 °C C. kcal/hr m2 °C D. kcal-m/hr °C E. kcal-m/m2 °C...
  8. Which of the following is expected to have highest thermal conductivity_______________?
    A. steam B. solid ice C. melting ice D. water E. boiling water...
  9. 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...
  10. Depending on the radiating properties, a body will be opaque when _________________?
    A. p = 0, x = 0 and a = 1 B. p=l,x = 0anda = 0 C. p = 0, x = 1 and a = 0 D. x – 0, a + p = 1 E. a=0,x + p= 1. where a = absorptivity, p = reflectivity, X = transmissivity...
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