Multiple choice general knowledge science & technology

Which of the following is used as a lubricant?

  1. Graphite

  2. Silica

  3. Iron Oxide

  4. Diamond
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Graphite's layered structure allows sheets to slide over each other easily, making it an effective solid lubricant especially at high temperatures. Silica and iron oxide are abrasive, not lubricating. Diamond is the hardest substance and used as an abrasive, not a lubricant.

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