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Availability of drinking water is continuously decreasing. The government decided to identify those sources of drinking water which getting polluted. The following table depicts the number of polluted sources in a district. Source of drinking water getting polluted Number Wells 24 Handpump 12 Dam 12 Borewell 6 Ponds 18 The pictograph table for the above table will be (A) Source of drinking water getting polluted Number symbol = 6 source Wells Handpump Dam Borewell Ponds (B) Source of drinking water getting polluted Number symbol  = 6 source Wells Handpump Dam Borewell Ponds (C) Source of drinking water getting polluted Number symbol  = 6 source Wells Handpump Dam Borewell Ponds (D) Source of drinking water getting polluted Number symbol  = 6 source Wells Handpump Dam Borewell Ponds
The Bureau of Indian Standards has prepared a draft standard for the supply of piped drinking water, named as "Drinking Water Supply Quality Management System-requirements for piped drinking water supply service." Which of the following statements are the key features of the draft? 1. After treatment the drinking water should conform to Indian Standard (IS) 10500. 2. Adoption of District Metering Area concept to control leakages. 3. Water audit should be conducted on quarterly basis. Select the correct answer using the code given below:
The treatment system includes a WAC, SAC, followed by a WBA and SBA. There is a degasser in this system. Calculate the amount of SBA resin required for the following data. M Alkalinity: 100 ppm as CaCO3 P Alkalinity: 100 ppm as CaCO3 Silica: 30 ppm as CaCO3 CO2: 45 ppm as CaCO3 EMA: 100 ppm as CaCO3 Capacity: 37 Kg/m3 Correction factor: 0.9 Flow rate: 35 m3/hr Operation hours: 10 hrs
Given below is statement followed by two conclusion numbered I and II. You have to assume everything in the statement to be true and decide which of them logically follow(s) from the statement beyond a reasonable doubt from the information given in the statement. Statement: In all developing countries, population is increasing. All developing countries are facing shortage of drinking water. Conclusion I: In all developing countries, if population decreases, then per person availability of drinking water will rise if availability of drinking water is fixed. Conclusion II: In some developing countries, population could be decreasing, yet they will have shortage of drinking water.
Following is an ecosystem of water-body, showing the concentration of DDT in each trophic levels. Water →  Algae → Fish → Pelican bird 1700 ppm → 500-600 ppm → 77 ppm → 0.2 ppm Which of the following feature is incorrect if the above is to represent biomagnification?
Threshold limit value (TLV) means maximum permissible/acceptable concentration. TLV of phosgene in air is about __________ ppm (parts per million).
The treatment system includes a WAC, SAC, followed by a WBA and SBA. There is no degasser in this system. Calculate the amount of resin required for the following information. M Alkalinity: 100 ppm as CaCO3 P Alkalinity: 100 ppm as CaCO3 Silica: 45 ppm as CaCO3 CO2: 45 ppm as CaCO3 Capacity: 37 Kg/m3 Correction factor: 0.9 Flow rate: 35 m3/hr Operation hours: 10 hrs
Ordinary mercury in glass thermometer is used for measuring temperature upto 120°C. However, for measuring higher temperature upto __________ °C, thermometer is made by filling nitrogen under pressure above the mercury, which stops the evaporation of mercury and reduces the chance of broken thread of mercury.
With reference to street-lighting, how do Mercury vapour lamps differ from LED lamps? 1. Mercury vapour lamps use a fraction of the energy used in the case of LED lamps. 2. LEDs have a lower radiance than mercury arc lamps.  3. Mercury lamps are eco-friendly as they require low voltages than LED lamps to operate. Select the correct answer using the code given below.
In an English class, the teacher while narrating a story, mentioned a character, who goes to a river for brining drinking water, Nakul, a student intervened by asking whether drinking river water is safe because he is drinking water from a (Purifier) at his home. What should the teacher do?