(1) Subject to this Act, and in accordance with any relevant regulations, every question to which this section applies shall be decided by a deciding officer.
(2) This section applies to every question arising under -
(a) Part II (social insurance) being a question -
(i) in relation to a claim for benefit,
(ii) as to whether a person is or was disqualified for benefit,
(iii) as to the period of any disqualification for benefit,
(iv) as to whether an employment is or was insurable employment or insurable (occupational injuries) employment,
(v) as to whether a person is or was employed in an insurable employment or insurable (occupational injuries) employment,
(vi) as to what rate of employment contribution is or was payable by an employer in respect of an employed contributor,
(vii) as to who is or was the employer of an employed contributor,
(viii) as to whether a person is or was entitled to become a voluntary contributor,
(ix) on any such other matter relating to Part II as may