Question

Which one of the following statements regarding helium is not true ?

• 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 carryingout experiments at low temperature

Answer 1

Answer: (C)

It is used to fill gas balloons instead of hydrogen because it is lighter and non inflammable

Answer 2

He is twice as heavy as hydrogen, its lifting power is 92% of that of hydrogen. He has the lowest melting point of any element which makes liquid helium an ideal oolant for many extremely low temperature applications based on super conducting magnet and cryogenic research where temperature close to absolute zero are needed