The propellant in the proposed PSLV rocket of the Indian space programme shall consist of :
(a) a composite solid propellant
(b) liquid propellants such as N2O4 + unsymmetrical dimethyl hydrazine (UDMH) and N2O4 + monomethyl hydrazine (MMH)
(c) both (a) and (b) in different stages of rocket propulsion
(d) kerosene and liquid oxygen

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