⚗️ Biochemical Engineering Solved MCQs with Answers

Practice 513 approved ⚗️ Biochemical Engineering questions with verified answers from the 🧬 Medical Science subject for Pakistan exams.

513 solved MCQs

Permanent hardness of water may be removed by the addition ofAnswer: sodium carbonate The maximum desirable limit Bureau of Indian Standards (BIS) of lead in the drinking water isAnswer: 0.05 mg/l Zeolite softening process removesAnswer: Both temporary and permanent hardness of water Conventional tertiary treatment isAnswer: Chemical coagulation and flocculation The maximum desirable limit (BIS) of total hardness (as CaCo3) in drinking water isAnswer: 300 ppm The chemical oxygen demand (COD)measures theAnswer: Amount of oxygen that would be removed from the water in order to oxidize pollution Hardness of water does notAnswer: Make it unfit for drinking Permanent hard water may be softened by passing it throughAnswer: Sodium hexametaphosphate 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 withAnswer: 10% sodium chloride solution Temporary hardness of water is caused by the presence ofAnswer: Bicarbonates of calcium and magnesium Secondary treatment uses __________ to consume wastes.Answer: Micro-organisms Application of quaternary ammonium compounds as sanitizing agents tends toAnswer: Increase the percentage of gram(-)ve rods on utensils Permanent hardness of water is caused by the presence ofAnswer: Chlorides and sulfates of calcium and magnesium According to BIS the maximum permissible limit of dissolved solids in drinking water isAnswer: 2000 mg/l Acid used mostly for removal of milk stone isAnswer: Nitric acid Which of the following chemical is sometime added in the process of coagulation and flocculation?Answer: Aluminum sulphate Which of the following physical method is used as germicidal in modern time for the treatment of drinking water?Answer: UV radiation Sanitizer used specifically for vitreous enamel areAnswer: Weak alkali with sodium silicate The common methods used for disinfection in waste water treatment plants areAnswer: Both (a) and (b) Inhibitors are used along with sanitizer toAnswer: To prevent corrosion Sanitizers used for rubber made equipments areAnswer: Strong alkalis Which of the following substances are commonly used in a filter?Answer: Both (a) and (b) Biological oxidation processes usually referred as biological treatment, are the most common form ofAnswer: Secondary treatment The maximum permissible limit (BIS) of turbidity in drinking water isAnswer: 10 NTU Sedimentation is a physical process used in wastewater treatment toAnswer: Remove particles that are more dense than water The ultimate source of water isAnswer: Rain and snow The ultimate source of water isAnswer: Rain and snow Lagoons may be characterized asAnswer: All of these Temporary hardness of water may be removed by addingAnswer: Calcium hydroxide The maximum desirable limit (BIS of mercury in the drinking water isAnswer: 0.001 mg/l