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721. In an ordinary dry cell, the electrolyte is
A. sulphuric acid
B. manganese dioxide
C. ammonium chloride
D. zinc
Explanation:
722. The two elements that are frequently used for making transistors are
A. boron and aluminium
B. silicon and germanium
C. iridium and tungsten
D. niobium and columbium
Explanation:
723. Which of the following structures (glands) is concerned with the production of cortisone hormone in man ?
A. Thyroid
B. Testis
C. Adrenal
D. Pancreas
Explanation:
724. Saponification involves the hydrolysis of fats and oils by
A. water
B. washing soda
C. stearic acid
D. caustic soda
Explanation:
725. An ordianary tubelight used for lighting purposes contains
A. fluorescent meterial and an inert gas
B. one filament,reflective material and mercury vapour
C. fluorescent material and mercury vapour
D. two filaments, fluorescent material and mercury vapour
Explanation:
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