Download Aptitude Crack
img not found img not found

Heat Transfer

Q1:

Pick out the wrong statement:

A With change in temperature, the radiant energy emitted by a black body remains unchanged.

B Absorptivity of a body approaches unity in case of diffuse reflection.

C Absorptivity of a perfectly black body is unity.

D Value of Stefan-Boltzman constant is 4.876 x 10-8 KCal/m2.hr.°K4.

ANS:A - With change in temperature, the radiant energy emitted by a black body remains unchanged.

The wrong statement among the options is: "Value of Stefan-Boltzmann constant is 4.876 x 10-8 KCal/m2.hr.°K4." The correct value of the Stefan-Boltzmann constant is approximately 5.67×10−85.67×10−8 W/m²K⁴, not 4.876 x 10-8 KCal/m2.hr.°K4. So, the statement "Value of Stefan-Boltzman constant is 4.876 x 10-8 KCal/m2.hr.°K4" is incorrect.



img not found
img

For help Students Orientation
Mcqs Questions

One stop destination for examination, preparation, recruitment, and more. Specially designed online test to solve all your preparation worries. Go wherever you want to and practice whenever you want, using the online test platform.