AFOQT Physical Science questions with verified solution 2023

AFOQT Physical ScienceAbsolute zero - correct answer the lowest possible temperature (-273.15 degrees Celsius) Atmospheric pressure - correct answer The pressure exerted by the gases in the air. Units of measurement are kilopascals (kPa), atmospheres (atm), millimeters of mercury (mm Hg) and Torr. Standard atmospheric pressure is 100 kPa, 1 atm, 760 mm Hg or 760 Torr. Atom - correct answer The smallest particle of an element; a nucleus and its surrounding electrons. Atomic mass - correct answer The mass of an atom measured in atomic mass units (amu). An atomic mass unit is equal to one-twelfth of the atom of carbon-12. Atomic mass is now more generally used instead of atomic weight. Example: the atomic weight of cholrine is about 35 g/mol. Atomic number - correct answer Also known as proton number, it is the number of electrons or the number of protons in an atom. Example: the atomic number of gold is 79 Atomic weight - correct answer A common term used to mean the average molar mass of an element. This is the mass per mole of atoms. Example: the atomic weight of chlorine is about 35 g/mol. Boiling point - correct answer the temperature at which a substance undergoes a phase change from a liquid to a gas Celsius scale - correct answer a temperature scale on which the freezing point of water is at 0 degrees and the normal boiling point at standard atmospheric pressure is 100 degrees Change of state - correct answer A change between two of the three states of matter, solid, liquid and gas. Example: when water evaporates it changes from a liquid to a gaseous state.