In such case, and also where such denial as aforesaid is made before a Registrar in respect of a document presented for registration to him, the Registrar shall, as soon as conveniently may be, enquire.—
(a) whether the document has been executed;
(b) whether the requirements of the law for the time being in force have been complied with on the part of the applicant or person presenting the document for registration, as the case may be, so as to entitle the document to registration.