20. Standard size screwdrivers can be used for which of the following purposes? (A) Removing and installing screws. (B) Prying off oil pans. (C) Hammering on tight parts. (D) All of the above.

If the thermal strain developed in polyimide film during deposition is given as 0.0044. assume room temperature is kept at 17.3 c, and thermal coefficient of expansion for the film and the substrate are 54 x 10^-6c^-1 and 3.3 x 10^-6c^-1respectively. calculate the deposition temperature.

What is the heat treatment of metals? what is the benefit of it? why and how it's useful? answer in details, do not write by hand.

For a gate width of 2 m into the paper, determine the force required to hold the gate abc at its location.