6551. The destruction of microorganisms by steam may be described as
6552. Typical aeration rates for aerobic fermentation are
6553. The sterilization method depends
6554. The specific death rate of an organism can be expressed as
6555. The interception efficiency can be expressed as (where dp is the particle diameter and Dc cylindrical collection diameter)
6556. The relationship between the del factor, temperature and time is given as
6557. The del factor (Δ) increases as the final number of cells
6558. Fresco paintings of Ajanta Caves belong to the:
6559. Which of the following contains a list of files in Unix?
6560. To which of the following is the term “Operation flood” associated?
6561. The capital-seat Gangaikondacholapuram was founded by
6562. Shivaji assumed the title of Chhatrapati in the year
6563. Hardness of water does not
6564. Permanent hard water may be softened by passing it through
6565. 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
6566. Temporary hardness of water is caused by the presence of
6567. Secondary treatment uses __________ to consume wastes.
6568. Application of quaternary ammonium compounds as sanitizing agents tends to
6569. Permanent hardness of water is caused by the presence of
6570. According to BIS the maximum permissible limit of dissolved solids in drinking water is
6571. Acid used mostly for removal of milk stone is
6572. Which of the following chemical is sometime added in the process of coagulation and flocculation?
6573. Which of the following physical method is used as germicidal in modern time for the treatment of drinking water?
6574. Sanitizer used specifically for vitreous enamel are
6575. The common methods used for disinfection in waste water treatment plants are
6576. Inhibitors are used along with sanitizer to
6577. Sanitizers used for rubber made equipments are
6578. Which of the following substances are commonly used in a filter?
6579. Biological oxidation processes usually referred as biological treatment, are the most common form of
6580. The maximum permissible limit (BIS) of turbidity in drinking water is
6581. Sedimentation is a physical process used in wastewater treatment to
6582. The ultimate source of water is
6583. Permanent hardness of water may be removed by the addition of
6584. Both temporary and permanent hardness of water can be removed on boiling water with
6585. Lagoons may be characterized as
6586. Temporary hardness of water may be removed by adding
6587. The maximum desirable limit (BIS of mercury in the drinking water is
6588. From the following sanitizers which one comes under category of surface active agents?
6589. The purest form of naturally occurring water is
6590. Calgon is used for removal of
6591. The water being used in dairy industry should contain not more than
6592. The activated sludge process consists of returning a portion of the clarifier
6593. The activated sludge process is sometime referred as
6594. BOD stands for
6595. When temporary hard water is boiled, one of the substances formed is
6596. Zeolite softening process removes both temporary and permanent hardness of water. In this process the calcium and magnesium present in water are precipitated as
6597. The methods used for biological treatment are
6598. Both temporary and permanent hardness of water can be removed by
6599. Coliform bacteria in water is an indication of the presence of
6600. The maximum desirable limit Bureau of Indian Standards (BIS) of lead in the drinking water is