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  1. For the given statements :
    I. Mating spur gear teeth is an example of higher pair
    II. A revolute Joint is an example of lower pair Indicate the correct answer.
    1. Both I and II are false
    2. I is true and II is false
    3. I is false and II is true
    4. Both I and II are true
Correct Option: D

Since higher pair has a line or point contact and lower pair has a surface of Area contact. Hence both are true. i.e., spur gear has line contact (Higher pair) and Revolute joint has surface contact (lower pair).

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