<prompt> KVP in X ray determines -Kilovolt potentialKilovolt peakKilovolt powerKilovolt per minute  <response>: Ans. is b i.e., Kilovolt peak Ref: Grainger 6the p. 154o Two exposure factors are importantKilovolt peak KVP : - It is the voltage which is applied between filament cathode and target anode. It creates an electrical potential between the anode and cathode so the electron from the cathode travel to the anode. It provides kinetic energy to x-ray therefore it is responsible for penetrating power of x-rays, higher the KVP more the penetrating power of x-rays. Contrast is also influenced by KVP, lower the KVP higher the contrast contrast is the difference in optical densities in the various regions of x-ray film which allows for differentiation of anatomic structures.Milliampere second mAs :- It is the combination of electric current for heat production at cathode. It determines the number of x-ray photons. It controls the density of the film, i.e., amount of blackening of film Density refers to overall blackening of the film. 