First, understand what is a contour. A contour represents all the points on the ground that have the same RL. So, contour interval is the difference in the RL of the two adjacent contours. Let us sa, we have drawn acontour diagram showing 70.00 m, 71.00 m , 72.00 m . Then what is a contour inerval? It is 1.00 m 

Answer:

The pressure at the base of a liquid column is given by the formula P =hdg. Or h=P/(dg).  If, h ,the height of the liquid column is in metres , d =density of the liquid in  Kgs/metre^3 and g= acceleration due to gravity in metres/sec then the      pressure P is measured in Pascals

It is given that the pressure desired at the base of the water tank tower =  60 Psi.By using the conversion formula                1 Psi = 6895 Pascals ,d= density of water =1000Kgs/Metre^3 and g= acceleration due to gravity =9.8 metres/sec^2 ,we 

have h =  P/(dg) 60*6895/(1000*9.8)  = 60*6895/9800=  42.21 metres.Hence the water tank should be at a minimum height of 42.21 metres to provide a pressure of 60Psi at the base of the water tower

By definition, the Young's Modulus is the ratio of stress to strain, within the limit of propportionality, of any material.

It is also defined  as the  stress in a material  per unit strain.

Hence Young's Modulus is an important tool to compare the load taking capability of various materials.The more the numerical value of Young's modulus, the material can safely take or experiaence more sress for the same quantity of strain.

Hence, if you plot a graph of stress versus strain, you may observe that the numerical value of Young's Modulus is the slope of the plot. 

Yes, Principles of Moments are extensively used in the study of LEVERS.

If you recall the subject of levers, it has three main features, a fulcrum and two arms. On one arm load is applied and on other arm the load is applied. So , we have to calculate moments due to tha applied Force. And, we have to calculate the moments at the load end. Remember all moment are calculated about/ with respect to the Fulcrum.  Hence, in study of Levers, the knowledge of the concept of Moments is very important and useful.

Pressure Bulb 

Pressure bulb is a graphical representation of the stresses in a material under a specified kind of loading. The Loading may be a point load, Uniformly Distributed load Uniformly Varying load or any other random loading pattern. It is in form of cuved lines which start from one side of the point of application of load and end on the other side.  So, most of the pressure bulb diagrams look like the drawing of an onion. Peerhaps that is why they are known as pressure bulbs.

The curve nearest to the load represents the maximum stress.

The curve farthest from the poin of application of load is the least stress.

No two curves intersect each other. One curve represents graphically all the points of same stress. 

If two or more curves are located near each other, it means that the region is severely stressed.

If the stress lines are placed far away from each other, it means that the region shown is not subjected to higher stresses. 

Isobar    

Isobar is defined as a line/ curve that represents all the points having a specified stress. It can be of any shape. There can be no cuts or breaks in an Isobar. It can not form a loop over itself. Two isobars of different values never intersect each other. So, you may understand that a Pressure bulb is a collection of many isobars drawn in a sequence.

Venturimeter is a device invented by gv ventury for measuring the flow velocity and discharge. It has three sections converging section, diverging section and cylindrical throat section.

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A critical path is a sequence of interdependent activities or tasks that must be finished before the project can be finished. It is the longest path (i.e. path with the longest duration) from project start to finish

A floating foundation is a type of foundation constructed by excavating the soil in such a way that the weight of structure built on the soil is nearly equal to the total weight of the soil excavated from the ground including the weight water in the soil before the construction of structure