1.

Which one of the following statements regarding helium is incorrect

Answer»

It is used to produce and sustain powerful superconducting magnets
It is used as a cryogenic agent for carrying out experiments at low temperature
It is used to fill gas balloons insteadof HYDROGEN because it is LIGHTER and non-inflammable
It is used in gas-cooled nuclear REACTORS

Solution :Helium is twice as heavy as hydrogen , its lifting power is 92% of that of hydrogen. Helium has the lowest MELTING and boiling point of any element which makes LIQUID helium an ideal coolant for many extremely low temperature application such as super conducting magnet and cryogenic research where temperature close to absolute zero are needed.


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