Scope Significance Question and Answer

Scope Significance Question and Answer Points : Scope Significance and basic definition chapter Question and Answer Q1. Define the density? Ans: The density (or mass density) of a liquid may be defined as the mass per unit volume at a standard temperature and pressure and is usually denoted as (p) Mathematically density, mass/volume. Q2. Write down the units of den s1t In S.I and M.K.S system. Ans: KN/m³ or Kg/m³ Q3. Define the specific weight. Ans: The specific weight (or weight density) of a liquid may be defined as the weight per unit volume at the standard temperature and pressure and is usually denoted as (w), Q4. Write down the units of sp. wt and also write down the formula? Ans. Kg/m³ or weight/volume. Q5. Define the sp volume. Ans. Unit density of the liquid is called sp. volume. Q6. Write down the value of sp.wt of water In MKS and F.P.S system. Ans. 1000 kg/m³ or 62.416/ft³. Q7. Define the sp. gravity? Ans. The specific gravity (briefly written as sp gr. of a liquid may e defined as the ratio of its specific weight to that of a standard substance at a standard temperature. For liquids, pure water, is taken as a standard substance and at 4°C Mathematically specific gravity. Q8. Define the viscosity. Ans. We see that the flow of thin liquids, such as alcolol or water, is much easier than thick liquids, such as syrup or heavy oil. It is thus obvious, that each liquid possesses some property, which controls its rate of flow. This property is termed as viscosity and is an essential property of the liquid. We shall study the viscosity in detail in a separate chapter. Q9. Define the compressibility of water. Ans. The compressibility of a liquid may be defined as the variation in its volume, with the variation of pressure. The variation in the volume of water, with the Variation of pressure, is so small that for all practical purposes it is neglected. Thus, the water is considered to be an incompressible liquid. Q10. Define the surface tension, Ans. The surface tension of a liquid is its property, which enables it to resist tensile stress. It Is due to the cohesion between the molecules at the surface of a liquid.