BASIC COMPUTER CONCEPTS
IMPACT OF COMPUTERS ON WORK ENVIRONMENTS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Drinking water must have more than 4 ppm of chlorine.
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Drinking water in the United States contains 4 ppm of chlorine.
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The EPA has never found more than 4 ppm of chlorine in drinking water.
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The amount of chlorine in drinking water must be less than or equal to 4 ppm.
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Detailed explanation-1: -What are safe levels of chlorine in drinking water? Chlorine levels up to 4 milligrams per liter (mg/L or 4 parts per million (ppm)) are considered safe in drinking water .
Detailed explanation-2: -EPA has set the maximum contaminant level goal for lead in drinking water at zero because lead can be harmful to human health even at low exposure levels. Lead is a toxic metal that is persistent in the environment and can accumulate in the body over time.
Detailed explanation-3: -The United States Environmental Protection Agency (EPA) recommends treatment when TDS concentrations exceed 500 mg/L, or 500 parts per million (ppm). The TDS concentration is considered a Secondary Drinking Water Standard, which means that it is not a health hazard.
Detailed explanation-4: -There is a federal standard of 4 mg/L for chlorine in drinking water known as a Maximum Residual Disinfectant Level (MRDL).