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Look at the chlorine residual data during chlorination of wastewater which consists of ammonia, organic matter, and microorganisms. Chlorine dosage (mg/L) 0.1 0.5 1.0 1.5 2.0 2.5 Chlorine residual (mg/L) 0.0 0.4 0.8 0.4 0.9 1.4 Calculate chlorine dose at the breakthrough point
An aqueous solution with chlorine 30 g/L and an organic compound with no chlorine at the rate 50 L/min were put into an extraction machine and produced aqueous solution with chlorine 5 g/L and organic compound with chlorine 10 g/L, what is the rate of aqueous solution?
Which of the following statements regarding static methods are correct?
1. Static methods are difficult to maintain, because you can not change their implementation.
2. Static methods can be called using an object reference to an object of the class in which this method is defined.
3. Static methods are always public, because they are defined at class-level.
4. Static methods do not have direct access to non-static methods which are defined inside the same class.
How much bleaching powder (having 20% available chlorine) is needed to disinfect 10,000 litres of water whose chlorine demand is 1.0 mg/l? It should  be ensured that, after about 1 hour contact time, 0.2 mg/l chlorine is available.
How many kg of bleaching powder is needed per day to chlorinate 4 MLD of water so than, after 40 minutes of contact, there remains residual chlorine of 0.25 mg/l. The input water has a chlorine demand of 1.25 mg/l. And that the bleaching powder has only 25% available chlorine. 
In a swimming pool, water and chlorine is mixed in which chlorine is 15% and water is 170 litres, what quantity of chlorine should be added in the swimming pool to make it 32% of the total weight of the swimming pool?
Consider the following statements in respect of injecting chlorine between rapid sand filter and storage tank: 1. More contact time is available. 2. Chlorine demand is reduced. 3. NHCl2 is formed which is more effective than residual chlorine. 4. Break point chlorination takes place. Which of the above statements are correct?
Disinfection of water is done to destroy pathogenic bacteria and thus prevent water-borne diseases. Disinfection of water may be done by the use of
Which of the following has developed an Ultra Violet Disinfection Tower for rapid and chemical-free disinfection of high infection-prone areas?
Below are given two Columns. Column- A presents the methods of teaching and Column-B presents the focus of a method. Match the two Columns. Column-A (Methods of Teaching) Column-B (focus of a Method) a) Collaborative Method  i) When expertise of teachers are used in teaching b) Co-operative Method ii) When emphasis is given on students as creator of knowledge c) Constructivist Method iii) When students share different aspects of a learning activity d) Team teaching iv) When students help each other to learn Select your answer from the options given below: