General Science question from FAA exam, 2024 by JKSSB
The washing machine works on the principle of which of the following?
Last updated May 13, 2026
Correct Answer:
Option D —
Centrifugation
The Principle: Centrifugation
A washing machine, specifically during the spin cycle, utilizes centrifugation to separate water from clothes. This process is based on the behavior of objects in a rotating frame of reference.
How it works: When the tub spins at high speeds, it creates a centrifugal force that acts on the mixture of clothes and water.
Separation: Because the tub has small perforations (holes), the water—which is less constrained than the fabric—is forced outward and through these holes, leaving the clothes damp but not soaked.
Physics Concept: This is essentially an application of Inertia. The water wants to continue moving in a straight line (tangent to the circle), while the curved wall of the tub constantly pulls the clothes toward the center. Since the holes offer no resistance, the water "escapes" the circular path.
Answer verified by Quintessence Classes faculty — Karan Nagar, Srinagar.
