1. The particle settling velocity in a fluid–particle suspension: (a) increases with increasing ratio of particle diameter to characteristic system dimension; (b) increases with increasing particle concentration; (c) increases with increasing fluid viscosity; (d) none of the above. 2. The terminal velocity of a particle settling in a stagnant fluid: (a) increases with increasing ratio of particle diameter to characteristic system dimension; (b) increases with increasing solids concentration; (c) both (a) and (b); (d) none of the above.

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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.