7 The following are factors affecting selective discharge of ions during electrolysis except Concentration of ions. Catalysts used Nature of the electrode d Position of ion in reactivity series Which one of the following can reduce friction on a moving parts of machines Ball bearing b. Hammering Steering d. Braking C 9 Fluid pressure depends on speed of flow of fluids b. depth of fluid in the container temperature of the fluid d. none of the above The following are the nature of image formed by a plume mirror except virtual b crect laterally inverted d real. 10 1. 11 The substance responsible for the formation of permanent hardness of water is sulphuric acid b calcium sulphate. c. calcium carbonate d. sodium carbonate. 12. Which one of the following practices does not damage the baur magnet? heating h. hammering keeping them in their keeper. d throwing them up and down. 13. One advantage of soup-less detergent over soapy detergent is soap-less detergent is cheaper than soapy one. soup-less detergent does not form scum with hard water soap-less detergent are made by white people. d. soap-less detergent are imported, 14. Which one of the following is a type of frietion' D.C generator b. Motor Kinetic energy d. None of the above 0 0 0 0 0 0