A musical rest is used to represent moment of silence in music.they are intervals of silence in pieces of music notably represented by symbols which indicates the length of the pause.
The quarter note represents silence as well in a piece of music, similar to the quarter note,rest equals to one beat in a measure.
The quarter note gets one beat if there are four beats in the measure.
Quarter rest corresponds in time value to a quarter note while half rest,a pulse or an interval of silence corresponds in terms of duration to two quarter rest or one half of a whole rest.
However,A whole rest is an interval or pause of silence equals in terms of duration to two half rest or one half of a breve rest.