Question

For nano metres whose diameters less than ________ are used as welding purposes.

(a) 10nm

(b) 20nm

(c) 30nm

(d) 40nm

I got this question during an interview.

This question is from Nano Wires and Nano Cones topic in section Nano Materials of Applied Chemistry

Answer 1

Right answer is (a) 10nm

For explanation I would say: For nano metres whose diameter is less than that of 10nm is mostly used for welding purposes. This requires precise control of heating mechanism.