Which of the following instruments make use of principle of moments during operation?

Ruler

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Vernier calipers

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Spring balance

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Simple balance

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Solution

The correct option is D Simple balance
The principle of moments states that when in equilibrium the total sum of the anti clockwise moment is equal to the total sum of the clockwise moment. When a system is stable or balance it is said to be in equilibrium as all the forces acting on the system cancel each other out. This is the basic principle of Simple balance (as shown on the image).

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