I think has something to do with UPS?
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Answer :

Static switches are power semiconductor devices which can be turn on and turn off means which have conducting and non conducting states. Static switches are better than mechanical switches because they are faster and compact but static switches are costlier than mechanical switches.
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Description : A UPS commonly has following parts : (i) rectifier (ii) inverter (iii) static switch Which of the following is true ?   (a) only (i) (b) only (i) and (ii) (c) (i), (ii) and (iii) (d) only (ii) and (iii) 

Description : List at least two examples that show how static electricity can be generated.

Answer : Examples of how static electricity can be generated include combing your hair, walking across a carpeted room, or sliding two pieces of plastic across each other.

Description : Briefly describe the electric field of a static charge.

Description : Define following term: (i) Precision (ii) Drift (iii) Static error (iv) Dead zone

Answer : (i) Precision: It is the measure of consistency or repeatability of measurements.   OR The closeness with which the individual measurements are departed or distributed about the average of number ... variable to which instrument does not respond. It is mainly due to friction in the instrument.