Multiple choice general knowledge

You can smell cat urine in your bedroom, but you are simply unable to identify the source. Which of the following would be the best method to find the offensive patch of carpet?*

  1. Spray the area with luminol and see what glows in the dark

  2. Have the carpet steam cleaned

  3. Get on all fours and sniff out the source yourself

  4. Turn off the lights and examine the carpet with a black light
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Cat urine contains compounds that fluoresce under ultraviolet (UV) light, which is what a black light emits. This makes the otherwise invisible stains glow, allowing you to locate the source. Luminol is used for detecting blood, not urine. Steam cleaning might remove the smell but won't help locate the source.

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