Question

6. How many colours can be used in the background
or
foreground in QBASIC?​

Answer 1

If you want to change the entire background color of the screen, use CLS command after setting the background color. There are 16 colors (in screen mode 0), numbered from 0 to 15.

Answer 2

QuickBASIC's colour command allows you to select all 16 possible foreground colours, but only allows you to specify a number between 0 and 7 for the background colour.