Question

Blood cell counters, operating on the principle of conductivity change, which occurs each time a cell passes through an orifice, are generally known as ________________

(a) optical method

(b) electrical conductivity

(c) coulter Counter

(d) microscopic method

Answer 1

Correct answer is (c) coulter Counter

The explanation: Blood cell counters, operating on the principle of conductivity change, which occurs each time a cell passes through an orifice, are generally known as Coulter Counters. The method was patented by Coulter in 1956 and it forms the basis of several particle counting instruments manufactured by a number of firms throughout the world.