Pick out the wrong statement?

Production of one ton of paper in Indian paper industry consumes about ________ kWh of electricity?

A control rod________?

For a cylindrical shell, (subject to the thickness of uppermost course being more than the minimum for dia of the tank in question), the thickness of the courses of shell________?

Inhalation of lead compounds present in the automobile exhausts (using leaded petrol) causes________?

Economy of an evaporator is influenced by the________?