Civil Engineering (CE) Exam > Civil Engineering (CE) Questions > Choose the correct option(s).a)Some amount o...
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Choose the correct option(s).
- a)Some amount of chlorine is allowed in drinking water because it helps in killing bacteria
- b)The value of electrical conductivity increases with increase in concentration of total dissolved solids
- c)Groundwater is generally free from suspended impurities
- d)Excess hardness in water is responsible for dissolved oxygen
Correct answer is option 'A, B, C'. Can you explain this answer?
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Choose the correct option(s).a)Some amount of chlorine is allowed in ...
Explanation:
Option A: Some amount of chlorine is allowed in drinking water because it helps in killing bacteria
Chlorine is commonly used as a disinfectant in drinking water treatment plants. It is added in small amounts to kill bacteria, viruses, and other microorganisms that may be present in the water. Chlorine is effective in destroying pathogens and preventing waterborne diseases. However, excessive levels of chlorine can have harmful effects on human health, so the amount of chlorine allowed in drinking water is regulated to ensure it is within safe limits.
Option B: The value of electrical conductivity increases with an increase in the concentration of total dissolved solids
Electrical conductivity is a measure of the water's ability to conduct an electric current. It is influenced by the presence of dissolved ions in the water, including total dissolved solids (TDS). TDS refers to the combined content of all inorganic and organic substances present in water as dissolved solids. These can include minerals, salts, metals, and other substances.
As the concentration of total dissolved solids increases in water, the number of ions available for conducting electricity also increases. This leads to an increase in the electrical conductivity of the water. Hence, there is a direct correlation between the concentration of total dissolved solids and the value of electrical conductivity.
Option C: Groundwater is generally free from suspended impurities
Groundwater is water that is stored beneath the Earth's surface in aquifers. It is naturally filtered as it percolates through layers of soil and rock, which helps remove many impurities and contaminants. Unlike surface water sources such as rivers or lakes, groundwater is generally free from suspended impurities.
Suspended impurities refer to solid particles that remain in suspension in water and can be visible to the naked eye. These impurities can include sediments, silt, clay, and organic matter. Due to the natural filtration process that groundwater undergoes, suspended impurities are effectively removed, resulting in relatively clear and clean water.
Option D: Excess hardness in water is responsible for dissolved oxygen
This statement is incorrect. Excess hardness in water does not directly affect the level of dissolved oxygen. Hardness in water refers to the concentration of dissolved minerals, primarily calcium and magnesium ions. It does not have a direct impact on the dissolved oxygen content.
Dissolved oxygen refers to the amount of oxygen gas dissolved in water. It is essential for aquatic life and plays a crucial role in maintaining the health of ecosystems. The primary sources of dissolved oxygen in water are atmospheric oxygen exchange, photosynthesis by aquatic plants, and aeration through turbulence or wave action.
Overall, the correct options are A, B, and C.
Option A: Some amount of chlorine is allowed in drinking water because it helps in killing bacteria
Chlorine is commonly used as a disinfectant in drinking water treatment plants. It is added in small amounts to kill bacteria, viruses, and other microorganisms that may be present in the water. Chlorine is effective in destroying pathogens and preventing waterborne diseases. However, excessive levels of chlorine can have harmful effects on human health, so the amount of chlorine allowed in drinking water is regulated to ensure it is within safe limits.
Option B: The value of electrical conductivity increases with an increase in the concentration of total dissolved solids
Electrical conductivity is a measure of the water's ability to conduct an electric current. It is influenced by the presence of dissolved ions in the water, including total dissolved solids (TDS). TDS refers to the combined content of all inorganic and organic substances present in water as dissolved solids. These can include minerals, salts, metals, and other substances.
As the concentration of total dissolved solids increases in water, the number of ions available for conducting electricity also increases. This leads to an increase in the electrical conductivity of the water. Hence, there is a direct correlation between the concentration of total dissolved solids and the value of electrical conductivity.
Option C: Groundwater is generally free from suspended impurities
Groundwater is water that is stored beneath the Earth's surface in aquifers. It is naturally filtered as it percolates through layers of soil and rock, which helps remove many impurities and contaminants. Unlike surface water sources such as rivers or lakes, groundwater is generally free from suspended impurities.
Suspended impurities refer to solid particles that remain in suspension in water and can be visible to the naked eye. These impurities can include sediments, silt, clay, and organic matter. Due to the natural filtration process that groundwater undergoes, suspended impurities are effectively removed, resulting in relatively clear and clean water.
Option D: Excess hardness in water is responsible for dissolved oxygen
This statement is incorrect. Excess hardness in water does not directly affect the level of dissolved oxygen. Hardness in water refers to the concentration of dissolved minerals, primarily calcium and magnesium ions. It does not have a direct impact on the dissolved oxygen content.
Dissolved oxygen refers to the amount of oxygen gas dissolved in water. It is essential for aquatic life and plays a crucial role in maintaining the health of ecosystems. The primary sources of dissolved oxygen in water are atmospheric oxygen exchange, photosynthesis by aquatic plants, and aeration through turbulence or wave action.
Overall, the correct options are A, B, and C.
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Choose the correct option(s).a)Some amount of chlorine is allowed in ...
Excess hard water in water is not responsible for dissolved oxygen
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Choose the correct option(s).a)Some amount of chlorine is allowed in drinking water because it helps in killing bacteriab)The value of electrical conductivity increases with increase in concentration of total dissolved solidsc)Groundwater is generally free from suspended impuritiesd)Excess hardness in water is responsible for dissolved oxygenCorrect answer is option 'A, B, C'. Can you explain this answer?
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