Find the odd one out based on the principle of Wheel and Axle:

Find the odd one out based on the principle of Wheel and Axle:
  1. Steering wheel of a bus
  2. Screwdriver turning a screw
  3. Rolling pin used for flattening dough
  4. Door key turning a lock mechanism

Solution

Steering wheel, screwdriver, and door key operate on differential radii (wheel and axle) to multiply torque. A plain rolling pin is a simple cylinder pressed down without differential torque action.

Asked in: Homi Bhabha Practice

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