Question

Which one of the following statements regarding helium is incorrect?

• A. It is used to fill gas balloons instead of hydrogen because it is lighter and non-inflammable
• B. It is used as a cryogenic agent for carrying out experiments at low temperatures
• C. It is used to produce and sustain powerful superconducting magnets
• D. It is used in gas-cooled nuclear reactors

Answer 1

The correct option is A It is used to fill gas balloons instead of hydrogen because it is lighter and non-inflammable

Evidence shows that the human voice can be changed with a bit of helium.
The gas is also used as light weight aircraft fuel. Helium is heavier than hydrogen, still the element is usually combined with hydrogen in air balloons. Hydrogen alone is fine, but helium makes the balloon safer to use. The same gas is used by caisson workers too. Divers use oxygen and helium during their dives.
Helium is used to cool down superconduction magnets. This is required during their operation. Welding companies also rely on it to provide protection. It is used the same way in the development of titanium, zirconium, germanium and silicon.