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JAMB Physics 2001 Question 41

Question 41

Conduction through Liquids and Gases

I. Low pressure
II. High pressure
III. High p.d.
IV. Low p.d.
Which combination of the above is true of the conduction of electricity through gases?

  1. A.I and IV only
  2. B.I and III only
  3. C.II and IV only
  4. D.II and III only
Show the answer and explanation

Answer: B (I and III only)

Explanation

A gas conducts well (as in a discharge tube) when its pressure is low and a high p.d. is applied across it.