Multiple choice

The pages of a book yellowed with the passage of time. A book-lover surmises that it happens due to the passage of time, resulting in certain chemical changes, rather than constant handling with hands.

Which of the following could go some way toward establishing the truthfulness of the book-lover’s hypothesis?

  1. Finding out whether it is possible to have a yellowing book, which has been frequently used.

  2. Finding out if it is possible to control yellowing by the use of certain chemicals.

  3. Finding out the relative extent of yellowing of pages in unused books after 5, 10 and 20 years.

  4. Finding out the extent of the yellowing of books after certain fixed intervals of time.
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C Correct answer
Explanation

This mentions yellowing of pages in unused books over a period of time. It is highly probable that the book-lover’s hypothesis has some weight. In this case, we have been able to rule out the other possible variables which could potentially result in the yellowing process.

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