(a) The state covenants and agrees with the holders of the bonds issued pursuant hereto as follows: (1) That such bonds shall constitute a direct and general obligation of the state; (2) that the full faith and credit of the state is hereby pledged to secure the payment of the principal of and interest on such bonds; (3) that an annual state tax shall be collected in an amount sufficient to pay, as it may accrue, the interest on such bonds and the principal thereof; and (4) that such tax shall be levied in any year only to the extent that the moneys in the veterans' mortgage fund irrevocably set aside for and applied to the payment of the interest on and principal of said bonds becoming due and payable in such year are insufficient therefor.
(b) In addition, in connection with any issue of bonds hereunder, the Governor may pledge or assign as security for the payment of the principal of or interest on such bonds, any of the following:
(1) The proceeds of any such bonds pending their use or of bonds which may be issued to renew such bonds;