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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
In an accident a container containing ethanol(s.g 0.789) falls down in a room of dimension 1*1*2(all in m). Ethanol forms a layer of 2mm. Ethanol vaporizes and diffuses through a stagnant film of air of thickness 2.5mm. What will be the time required for the water layer to disappear completely. The diffusivity of ethanol in air is 2.567*10-5 m2/s. the total pressure is 1.013 bar and the pressure of ethanol in bulk air is 0.02244 bar and at the ethanol-air interface is 0.02718bar. The temperature is 25.2°C.
Consider the following statements with reference to the mixing of industrial waste water with domestic waste water: 1. The industrial waste water can be mixed with domestic water when it has higher BOD. 2. The industrial waste water can be mixed with domestic water when the pH value of industrial waste water is highly alkaline. Which of the above statements is/are correct?
To prevent misuse of industrial ethanol, which of the following is added to it:
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:
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.
In what ratio should 20% ethanol solution be mixed with 40% ethanol solution to obtain a 28% ethanol solution?
A mixture containing 33% of ethanol is mixed with another mixture containing 98% ethanol in the ratio 7 : 3. Find the percentage of ethanol in the mixture formed.
A mixture containing 40% of ethanol is mixed with another mixture containing 60% ethanol in the ratio 1 : 1.4. Find the percentage of ethanol in the mixture formed.
A mixture containing 13% of ethanol is mixed with another mixture containing 31% ethanol in the ratio 13 : 31. Find the percentage of ethanol in the mixture formed.