Post-UTME Physics 2008 Objective — Question 7
Question 7 of 10 from the Post-UTME Screening (Post-UTME) Physics 2008 Objective paper, with the correct answer and a full explanation.
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The colour of the positive column in a discharge tube is characteristic of the
- A. Gas and the coating in the tubeCorrect
- B. Pressure of the gas only
- C. Temperature of the gas only
- D. Pressure and potential difference
Explanation
The colour depends on the gas identity (its emission spectrum) and any fluorescent coating.
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