Registration of a Partnership is not necessary. However, unless a partnership firm is registered with the registrar of firms, the rights of the partners cannot be enforced in a court of law.
When the partnership deed does not contain any provision for the duration of the partnership nor conditions for the termination of partnership, it is a partnership at will.
Yes. If the number of partners is more than 20, it has to be registered as a company.
A Limited Liability Partnership is a legal entity separate from its partners and therefore, offers limited liability to its partners whereby any liability of the LLP will be borne by the assets of the LLP. However, in the case of a general partnership, the partners are jointly and severally liable for each liability of the partnership firm.