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For which surfaces, spirit level is used for testing straightness?

For which surfaces, spirit level is used for testing straightness? Correct Answer Horizontal surfaces

In testing straightness, spirit level is used only for the horizontal surfaces while autocollimator can be used in any plane. In the case of spirit level, angular variations are measured by placing level on it.

Related Questions

A 60% spirit solution is mixed with r% spirit solution in the ratio 1 : 3 such that a s% spirit solution is obtained. When a (s/3)% spirit solution is mixed with 55% spirit solution in equal ratio, an (r/2)% spirit solution is obtained. Which of the following can be determined? (A) Value of ‘r’ (B) Value of ‘s’ (C) Volume of the 60% spirit solution mixed initially (D) If 9 liters of r% spirit solution was mixed initially, what was the volume of the s% spirit solution thus obtained?
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