Question

Cryogenics deal with temperatures around _________

(a) -50^oC

(b) -90^oC

(c) -180^oC

(d) -250^oC

This question was addressed to me in a job interview.

This interesting question is from Cryogenics, Hot and Cold Working of Metals topic in division Mechanical Working Processes & Phase Transformations of Engineering Material & Metallurgy

Answer 1

Correct option is (c) -180^oC

For explanation I would say: Cryogenics is defined as the study of materials at a low temperature. This often stands at -150^oC in general use but has a standard set by National Institute of Standards and Technology as -180^oC. This comes into consideration due to the boiling point of gases.