The most liquid asset among the options listed is bank deposit. Liquidity refers to the ease with which an asset can be converted into cash without affecting its market value. Bank deposits are highly liquid assets because they can be easily converted into cash by simply making a withdrawal from a bank account. On the other hand, bank notes, silver, and cheques may not be as readily accepted as a means of payment and may take longer to convert into cash. Therefore, bank deposits are considered the most liquid asset.