It is not possible to determine precisely both the position and the momentum or velocity) of a small moving particle (e.g. electron , proton, etc)
The above statements is known as :

Options

A. de-Broglie.s principle
B. Pauli.s exclusion principle
C. Heisenberg.s Uncertainity principle
D. Aufbau principle

Answer

C

Explanation

Heisenberg.s uncertainity principle : it is impossible to determine simultaneously the exact position and momentum of a body as small as an electron.