Multiple choice

Directions: Choose the most appropriate word or phrase from the options given below that best explains the meaning of the word in bold.

Lubricants are necessary to keep machines in good running condition.

  1. Substances to increase speed

  2. Substances to increase friction

  3. Substances to reduce friction

  4. Substances to reduce speed
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

 'Lubricate' means 'to make slippery or smooth', lubricant is therefore, a substance which increases smoothness and reduces friction.

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