"Typewriter" is the longest word that can be typed using only the first row on a QWERTY keyboard.

The statement "typewriter is the longest word that can be typed using only the first row on a QWERTY keyboard" is true. This is because when referring to a QWERTY keyboard, the first row consists of the letters "Q W E R T Y U I O P." All the letters of the word "typewriter" can be found on this first row without the need to shift to the other rows, making it the longest word that can be typed using only the first row.