A dumpy level with an interval focusing telescope has set-up on the left bank of a river and the rod readings tabulated below were taken on a stadia rod held successively at the left and right water edges. If the stadia interval factor of the instrument is 100, what is the width of the river? Hair Rod Position Upper (a) Middle (b) Lower © Rod Held @ 2.189 2.172 2.155 LWE Rod held @ 2.277 2.173 2.069 RWE Where: LWE = Left water edge RWE = Right Water edge Unit: meter

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Unit Conversion

Standard units are also called SI units. SI units are used for measuring a physical quantity satisfying certain conditions. There are two types of units: fundamental units and derived units. Fundamental units are physical quantities that are independent, that is, they do not depend on other quantities like mass, length, or time. There are plenty of quantities in our lives which need to be measured and compared. Measuring is the comparison of a particular physical quantity with its reference value. A unit is a measure of a fixed physical quantity. A physical quantity is the product of a unit and the numerical value we need to compare with.