Correct answer
A. Ribbed
Explanation
The correct answer is Ribbed.
Maximum permissible limit of industrial noise as recommended by World Health Organisation (WHO) is ________ decibels?
The safe distance of habitation from a hazardous chemical plant (TLV of its product < 1000 ppm) should be about ________ kms?
Coal washing waste water containing about 3% suspended solids (comprising of clay, slate, stone etc.) is treated for solid particles removal?
Pick out the correct statement?
The chamber process is________?
Validity of the relationship, inputs = outputs, holds good for the system at steady state________?