Which one of the following statements regarding helium is incorrect?A. It is used to produce and sustain powerful superconducting magnetsB. It is used to as a cryogenic agent for crrying out experiments at low tempreturesC. It is used to fill gas balloons insteat of hydrogen because it is lighter and non-inflammableD. It is used in gas-cooled nuclear reactors

Which one of the following statements regarding helium is incorrect?A.

1.	Which one of the following statements regarding helium is incorrect?A. It is used to produce and sustain powerful superconducting magnetsB. It is used to as a cryogenic agent for crrying out experiments at low tempreturesC. It is used to fill gas balloons insteat of hydrogen because it is lighter and non-inflammableD. It is used in gas-cooled nuclear reactors
Answer» Correct Answer - C Helium is twice as heavy as hydrogen, its lifting power is `92%` of that of hydrogen. Helium fas the lowest melting and boiling point of any element which makes liquid helium an ideal coolant for many externely low temperature application such as super conducting magnet and cryogenic research where tempereature close to absolute zero are needed.

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