21051. To which of the following is the term “Operation flood” associated?
21052. The capital-seat Gangaikondacholapuram was founded by
21053. Shivaji assumed the title of Chhatrapati in the year
21054. Hardness of water does not
21055. Permanent hard water may be softened by passing it through
21056. Zeolite used in zeolite softening process for the treatment of hard water gets exhausted after certain time of usage but can be regenerated by flushing it with
21057. Temporary hardness of water is caused by the presence of
21058. Secondary treatment uses __________ to consume wastes.
21059. Application of quaternary ammonium compounds as sanitizing agents tends to
21060. Permanent hardness of water is caused by the presence of
21061. According to BIS the maximum permissible limit of dissolved solids in drinking water is
21062. Acid used mostly for removal of milk stone is
21063. Which of the following chemical is sometime added in the process of coagulation and flocculation?
21064. Which of the following physical method is used as germicidal in modern time for the treatment of drinking water?
21065. Sanitizer used specifically for vitreous enamel are
21066. The common methods used for disinfection in waste water treatment plants are
21067. Inhibitors are used along with sanitizer to
21068. Sanitizers used for rubber made equipments are
21069. Which of the following substances are commonly used in a filter?
21070. Biological oxidation processes usually referred as biological treatment, are the most common form of
21071. The maximum permissible limit (BIS) of turbidity in drinking water is
21072. Sedimentation is a physical process used in wastewater treatment to
21073. The ultimate source of water is
21074. Permanent hardness of water may be removed by the addition of
21075. Both temporary and permanent hardness of water can be removed on boiling water with
21076. Lagoons may be characterized as
21077. Temporary hardness of water may be removed by adding
21078. The maximum desirable limit (BIS of mercury in the drinking water is
21079. From the following sanitizers which one comes under category of surface active agents?
21080. The purest form of naturally occurring water is
21081. Calgon is used for removal of
21082. The water being used in dairy industry should contain not more than
21083. The activated sludge process consists of returning a portion of the clarifier
21084. The activated sludge process is sometime referred as
21085. BOD stands for
21086. When temporary hard water is boiled, one of the substances formed is
21087. Zeolite softening process removes both temporary and permanent hardness of water. In this process the calcium and magnesium present in water are precipitated as
21088. The methods used for biological treatment are
21089. Both temporary and permanent hardness of water can be removed by
21090. Coliform bacteria in water is an indication of the presence of
21091. The maximum desirable limit Bureau of Indian Standards (BIS) of lead in the drinking water is
21092. Zeolite softening process removes
21093. Conventional tertiary treatment is
21094. The maximum desirable limit (BIS) of total hardness (as CaCo3) in drinking water is
21095. The chemical oxygen demand (COD)measures the
21096. The First Indian Cosmonaut
21097. In Unix ‘grep’ command is used for :
21098. The currency of Japan is
21099. The Chief Executive of a Municipality
21100. Who, amongst the following, lost his kingdom in Hindustan but retrieved it after about 15 years in exile ?
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