Q. Which one of the following statements regarding helium is incorrect?
A) It is used to produce and sustain powerful super conducting magnets
B) It is used in gas-cooled nuclear reactors
C) It is used to fill gas balloons instead of hydrogen because it is lighter and non-inflammable
D) It is used as a cryogenic agent for carrying out experiments at low temperature
Explanation
(c)
Helium is twice as heavy as hydrogen, its lifting power is 92% of that of hydrogen. Helium has the lowest melting point of any element which makes liquid helium an ideal coolant for many extremely low temperature application such as crystals, a sophisticated measuring instrument based on super conducting magnet and cryogenic research where, temperature close to absolute zero are needed
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.