$2.$ What is the primary mechanism by which internal treatment chemicals prevent scale formation in boilers?a$)$ Precipitationb$)$ Adsorptionc$)$ Ion exchanged$)$ Corrosion inhibitionWhat are the typical specifications for drinking water as per regulatory standards?a$)$ pH$,$ temperature, and colorb$)$ Turbidity, conductivity, and hardnessc$)$ Total dissolved solids, pH$,$ and microbial contentd$)$ Alkalinity, salinity, and odorWhich of the following is a common parameter used to assess the quality of drinking water?a$)$ Luminosityb$)$ Viscosityc$)$ Turbidityd$)$ DensityWhat is the acceptable limit for turbidity in drinking water?a$)10$ NTUb$)50$ NTUc$)100$ NTUd$)500$ NTU