Question

Consider the following statements:

Statement 1: Cryogenics involves temperatures below - ${80}^{\circ }$C.

Statement 2: Nitrogen and helium gases are used to attain low temperatures in cryogenics.

• A. Statement 1 is true, statement 2 is false
• B. Statement 1 is false, statement 2 is true.
• C. Both the statements are true.
• D. Both the statements are false.

Answer 1

The correct option is D

Both the statements are false.

Cryogenics involves temperatures below 123 K or - ${150}^{\circ }$C. So statement 1 is false. Also, liquid nitrogen and liquid helium are used to attain this low temperature; hence statement 2 is also false.