Question

Diuretics are substances that help eliminate water from the body. Few volunteers were taken into the study, all of which had same mass. They drank nothing for eight hours before the test and urinated just prior to ingesting the test substance. The three substances (water, caffeine, and salt) were tested on three separate days. The results are shown in the tables below.
Table-1

Volunteer	Amount of caffeine ingested (in 100 ml water)	Volume of urine collected after 1 hour
A	50 mg	302 ml
B	100 mg	492 ml
C	150 mg	667 ml
D	200 mg	863 ml

Table-2

Volunteer	Amount of sodium chloride ingested (in 100 ml water)	Volume of urine collected after 1 hour
A	0.9 g	201 ml
B	1.8 g	162 ml
C	2.7 g	125 ml
D	3.6 g	82 ml

Table-3

Volunteer	Volume of urine collected after 1 hour	Volume of urine collected after 1 hour
A	100 ml	230 ml
B	200 ml	240 ml
C	300 ml	252 ml
D	400 ml	263 ml

If a volunteer had ingest 4.5 g sodium chloride dissolved in 100 ml water, what would had be the amount of urine volume collected after one hour?

• A. 20 ml
• B. 30 ml
• C. 40 ml
• D. 50 ml
• E. 60 ml

Answer 1

The correct option is C 40 ml

From the table, as the increase in sodium chloride of 0.9 g results in the decrease in urine volume of approximately 40 ml. When 3.6 g sodium chloride is ingested, 82 ml urine is produced. Thus on ingesting 4.5 g sodium chloride, the expected urine volume would be 40 ml less than 82 ml i.e., 42 ml.

Therefore, the correct answer is option C.