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What to do if We want only items like 1. 2. and so on have a background color

I managed to get the sheading tab, but still, there are some problems. Problem 1: A black box on gray strip with question number in white. Problem 2 Insert indent of 1 cm for text throughout the document. Problem 3: Can we define globally for spacing between items or there is the only way to put ...

Table unnecessarily floats to next page. I want it to be placed where it is specified.
\renewcommand{\familydefault}{\sfdefault}
\usepackage{multirow}
\usepackage{graphicx}
\usepackage[scaled=1]{helvet}
\usepackage[helvet]{sfmath}
\usepackage{graphicx}
\setcounter{chapter}{0}
\frontmatter ...