For the given statements : I. Mating spur gear teeth is

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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).