Evaluation of subjective or text based answers has been a hurdle in the development of eLearning systems since a very long time. The problem related to evaluation of subjective answers is that each student has his/her own way of answering and it is difficult to determine the degree of correctness.
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The advancement in the technology has given us many types of concrete like plain cement concrete, high strength concrete and many other.
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Nowadays it is very hard to find drinking water which is free from bacterias and viruses and hence drinking these type of water reflects the human health.
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The demand for electricity is rising day to day with growing industries and household electrical appliances. To fulfill the daily energy requirements different energy sources like coal, water, and solar energy are employed at a very high cost. About 2/3 of the energy generated by a conventional power station is lost in the form of waste heat that escapes out of a cooling tower. But if we use the waste heat and convert the heat energy as usable electricity will make the power generation much more efficient.
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Construction of buildings is usually done on flat grounds, but due to the scarcity of flat grounds buildings are constructed on sloping grounds. Sloping grounds are those which are at an inclined level from the normal ground.
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Compressive strength is the resistance of a material to break under compression. The compression test is usually performed in a universal testing machine. This varies from tabletop to large machines. To avoid large machines, we have introduced machine learning and automation in construction.
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The Rapid increase in urbanisation and industrialisation lead to the construction of huge buildings and factories. So, the usage of concrete is also increased. As concrete is made of the limestone which is a natural resource, it is exhausted by extreme usage.
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Urban migration is the major reason for the generation of large amounts of sewage water. To overcome that large number of sewage treatment plants are built.
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In this urban life living it has become a necessity for automating everything. It is also useful when we forget something to turn off and it turns off automatically instead of people going back and turning it off.
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There are different electricity sources and from them some cause high pollution to the environment and while others are free from pollution but the efficiency is very less. If there is no water in the dam then there is no electricity from the hydro electric station.
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