The given image shows a measuring instrument.On the main scale of this instrument, the purpose of markings above and below the zero mark is to measure theI. depth.II. height.III. thickness.
Correct answer: A. I only
- A. I only
- B. III only
- C. I and II
- D. II and III
Explanation
A spherometer is a precision instrument primarily used to measure: * The radius of curvature of spherical surfaces, such as lenses and mirrors. * The thickness of small plates or objects. * The depth of depressions in a surface.The purpose of the markings above and below the zero mark on the main scale of a spherometer is to measure the vertical displacement of the central screw relative to the plane formed by its three outer legs.
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Physical quantities combine a numerical value with a unit, and are expressed using SI base units or derived units such as newtons, joules and pascals. The topic covers prefixes, unit conversion, dimensional analysis, significant figures and measurement uncertainty, while distinguishing scalar quantities from vectors where direction matters.
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