Lead (Pb) is used for

Correct answer: (b) Transmission of light

Explanation

Lead is used in storage batteries, as a shield against X-rays and gamma rays, in solder and cable sheathing. As lead oxide it goes into flint (lead) glass, whose high refractive index suits lenses, prisms and other optical glass for carrying light.

Of the options given, the key takes this use, transmission of light.

None of the options describes lead's main uses well; the key takes its use in optical (flint) glass.