A. manometer
B. a mechanical gauge
C. hydrometer
D. psychrometer
A. nickel hydroxide
B. powdered iron and its oxide
C. 21% solution of KOH
D. all of the above
A. compactness
B. lower e.m.f.
C. small quantity of electrolyte used
D. higher internal resistance
A. Loss of capacity
B. Loss of life
C. Corrosion of the grids of the plate
D. All above
A. to allow gases out when the cell is on charge
B. to add water to the cell if needed
C. to check the level of electrolyte
D. to do all above functions
A. NaOH
B. KOH
C. HC1
D. HN03
A. lead and lead peroxide
B. lead sulphate and lead
C. lead peroxide and lead
D. none of the above