NDA Government Jobs Exams

Air is -
(A) always a compound (B) always a mixture
(C) a compound in pollution free zones (D) a mixture in industrial zones

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NDA Other Question

He is an INDEFATIGABLE worker -
(A) tired (B) tireless
(C) brave (D) skilful
Which one among the following is an electrochemical cell that cannot be charged ?
(A) Electrolytic cell (B) Storage cell
(C) Primary cell (D) Fuel cell