Q.

The spring balance works on the principle of -

A. Boyle's Law
B. Hooke's Law
C. Bernoulli's principle
D. Pascal's Law
Answer» B. Hooke's Law
Explanation: A spring scale or spring balance or Newton meter is a type of weighing scale. It consists of spring fixed at one end with a hook to attach an object at the other. It works by Hooke's Law, which states that the force needed to extend a spring is proportional to the distance that spring is extended from its rest position.
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