Multiple choice general knowledge

If A1, A2, A3,etc. represent paper sizes. What does C1, C2, C3 represent ?

  1. Paper Thickness

  2. Paper Whiteness

  3. Cover Sizes

  4. There is nothing like C1,C2,C3
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The ISO 216 paper size standard includes A series (A1, A2, A3) for general printing and C series (C1, C2, C3) specifically for envelopes and covers. C sizes are designed to accommodate A series paper - a C4 envelope fits an unfolded A4 sheet perfectly.

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