Print quality of printer is given in _______ and printing speed is given in _______

Question

Accepted Answer

The correct option is (3):
The standard unit used globally to specify the quality of a printer's output is **Dot Per Inch (DPI)**. This metric defines the spatial printing resolution, representing the number of individual ink dots a printer can place within a linear inch of paper. A higher DPI value means more dots packed into the same area, which translates directly to finer detail, smoother gradients, and higher image sharpness—hence, superior print quality. The printing speed is universally measured in **Paper Per Minute (PPM)**. This is a throughput metric indicating the number of complete pages (typically standard-sized, like A4 or Letter) that the printer can successfully output in sixty seconds. PPM is the most practical and widely recognized measure of a printer's productivity.

The incorrect option is (1):
Option 1, Paper Per Minute (PPM), Dot Per Inch (DPI), incorrectly reverses the proper units for the two concepts. PPM is an absolute measure of speed or volume over time, indicating the rate of page production, and has no direct correlation to the visual quality of the printed image. DPI, on the other hand, is a measure of density or resolution—the number of dots per square inch—which is the fundamental determinant of image quality. Since the question asks for quality first and speed second, this option is ordered incorrectly.

The incorrect option is (2):
Option 2 presents two entirely irrelevant or contextually wrong metrics for printer specifications. **Chromatic Number (CN)** is a concept primarily from the mathematical field of graph theory and has no established meaning in the context of print quality or printer hardware specifications. **Rotation Per Minute (RPM)** is a unit of frequency used to specify rotational speed for motors or spinning components, such as a fan or a hard disk platter. While internal printer parts spin, RPM is not the standard, user-facing metric for a printer's overall document output speed.

The incorrect option is (4):
Option 4, Dot Per Inch (DPI), Rotation Per Minute (RPM), correctly identifies the unit for print quality as DPI. However, it incorrectly specifies RPM for printing speed. RPM measures the angular speed of a rotating component, such as the laser printer's drum or the spinning motor within a continuous-feed printer. The speed at which a user experiences output, meaning the number of finished pages produced, is universally measured in PPM, not RPM.