A. aluminium
B. steel
C. brass
D. copper
E. lead

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Related Mcqs:

  1. Which of the following is expected to have highest thermal conductivity_______________?
    A. steam B. solid ice C. melting ice D. water E. boiling water...
  2. 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...
  3. Thermal conductivity of non-metallic amorphous solids with decrease in temperature __________________?
    A. increases B. decreases C. remains constant D. may increase or decrease depending on temperature E. unpredictable...
  4. 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...
  5. Unit of thermal conductivity in S.I. units is__________________?
    A. J/m2 sec B. J/m °K sec C. W/m °K D. A. and C. above E. B. and C. above...
  6. Thermal diffusivity of a substance is ____________________?
    A. proportional of thermal conductivity B. inversely proportional to k C. proportional to (k) D. inversely proportional to k2 E. none of the above...
  7. Thermal conductivity of glass-wool varies from sample to sample because of variation in ________________ ?
    A. composition B. density C. porosity D. structure E. all of the above...
  8. Thermal diffusivity is ____________________?
    A. a dimensionless parameter B. function of temperature C. used as mathematical model D. a physical property of the material E. useful in case of heat transfer by radiation...
  9. Thermal diffusivity of a substance is __________________?
    A. directly proportional to thermal con¬ductivity B. inversely proportional to density of substance C. inversely proportional to specific heat D. all of the above E. none of the above...
  10. The thermal diffusivities for gases are generally_____________________?
    A. more than those for liquids B. less than those for liquids C. more than those for solids D. dependent on the viscosity E. same as for the liquids...
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