See the map below showing the position of two factories and a village. People in the village suspect that one or both of the factories are polluting the river from which they use the water for their daily needs. However the factories claim that the river is polluted upstream and they are not responsible for the pollution. (Note the direction of the rivers flow.)
Which is the minimum number of points at which samples of water should be taken to identify whether and which factory is polluting?
A. All five points 1, 2, 3, 4 and 5
B. Four points 1, 2, 3 and 4
C. Four points 1, 2, 4 and 5
D. Three points 2, 4 and 5
(correct answer is B but I want the explanation)
Answers
Answer:
D. Three points 2,4 and 5
Explanation:
Answer:
Explanation:
Factory:
A factory, also known as a manufacturing plant or production facility, is a type of industrial building that frequently consists of numerous buildings that are all filled with machinery and is used to create goods or run machines that turn one thing into another. The vast majority of the world's goods are produced or processed in factories, making them an essential component of contemporary economic output.
When the space and financial needs for cottage industry or workshops increased throughout the Industrial Revolution, factories were created. The term "glorified workshops" has been used to describe early factories that only had a few pieces of machinery, such as one or two spinning mules, and a small number of employees.
Factories can create discrete goods or a certain kind of material continuously, such chemicals, pulp and paper, or refined oil products. Chemical manufacturing facilities—often referred to as plants—may have the majority of their machinery—tanks, pressure vessels, chemical reactors, pumps, and piping—outside and run from control rooms. The majority of the equipment used in oil refineries is outdoors.
Discrete products can be finished things or components and subassemblies that are used to create finished goods somewhere else. Parts may be shipped to factories from overseas or made at factories using raw materials. Industries with continuous manufacturing often convert streams of raw materials into final goods using heat or electricity.
The name "mill" historically referred to the process of grinding grain, which typically required the use of natural resources like until steam power replaced it in the 19th century, wind power. The phrase still exists as in steel mill, paper mill, etc. because numerous activities, including spinning and weaving, iron rolling, and paper production, were first powered by water.
Minimum number of points at which samples of water should be taken to identify whether and which factory is polluting:
Correct answer is B at Four points 1,2,3 and 4
In order to determine whether and which factory is polluting, water samples must be taken at a minimum of four locations: points 1, 2, 3, and 4, as the river is closer to these locations than it is to the village and as a result, more people are affected and contract diseases as a result.
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