Hello seema

Today I will tell you some logic behind choosing a pen always use BLACK BALL PEN and NOT GEL PEN to answer questions. When you are appearing for your paper exam or which generally takes time to declare result ,the answer sheets are kept here and there for a long period of time in which it may happen that the colour may fade. That’s why prefer black ball pen. Always use BLUE GEL PEN to highlight the points or underline them . As it is shiny in nature and will be clearly visible in one glance. and now If your asking to fill up form then prefer BLACK BALL PEN because there is a common sense writing forms take time and black pen don't fade away.

hope you do well!