By default how many worksheets are available in "workbook" (Excel)?

3

Correct answer: Option (3) → 3

Concept: Basic concepts of a spreadsheet – workbook and worksheets, from Spreadsheet.

An Excel file is called a workbook, which is a collection of worksheets. NCERT states that by default three sheets – Sheet1, Sheet2 and Sheet3 – are available to the user in a workbook. Hence Option (3).