A waste water sample diluted to 100 times with aeration water had an initial dissolved oxygen (DO) of 7.0 mg/l and after 5 days of incubation at 20°C, the DO was zero. The BOD of waste water is :-A-700 mg/lB-100 mg/lC-cannot be determinedD-7mg/l-A-700 mg/l

Question

A waste water sample diluted to 100 times with aeration water had an initial dissolved oxygen (DO) of 7.0 mg/l and after 5 days of incubation at 20&deg;C, the DO was zero. The BOD of waste water is :-A-700 mg/lB-100 mg/lC-cannot be determinedD-7mg/l-A-700 mg/l

APTITUDE CRACK · Accepted Answer

The correct option is  A 700 mg/l Even I think the answer should be C because at what time do become 0 is not known. It becomes after 5 days because reading is taken after 5 days but maybe at the 3rd to 4th day it became 0. So, the answer cannot be determined.

GATE Exam Questions

Q1: A waste water sample diluted to 100 times with aeration water had an initial dissolved oxygen (DO) of 7.0 mg/l and after 5 days of incubation at 20°C, the DO was zero. The BOD of waste water is :

For help Students Orientation
Mcqs Questions

Quick Links

Newsletter

GATE Exam Questions

Q1: A waste water sample diluted to 100 times with aeration water had an initial dissolved oxygen (DO) of 7.0 mg/l and after 5 days of incubation at 20°C, the DO was zero. The BOD of waste water is :

Solution

For help Students Orientation Mcqs Questions

For help Students Orientation
Mcqs Questions