Electro deposition of metals i.e. electroplating is never done on________?

Which of the following has the lowest overall heat transfer co-efficient?

The half life period of a radioactive element is 100 days. After 400 days, one gm of the element will be reduced to ________ gm?

Aromatics have the highest ________ of all the hydrocarbons of same carbon atoms?

Which equation is not an equation of state?

Velocity at a certain point in case of streamline flow is________?