MCQOPTIONS
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MCQOPTIONS
This section includes 528 Mcqs, each offering curated multiple-choice questions to sharpen your Chemical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 101. |
The minimum and maximum diameters of sewers shall preferably be |
| A. | 15 cm and 100 cm |
| B. | 15 cm and 300 cm |
| C. | 30 cm and 450 cm |
| D. | 60 cm and 300 cm |
| Answer» C. 30 cm and 450 cm | |
| 102. |
The maximum efficiency of BOD removal is achieved in |
| A. | Oxidation pond |
| B. | Oxidation ditch |
| C. | Aerated lagoons |
| D. | Trickling filters |
| Answer» C. Aerated lagoons | |
| 103. |
The gas from sludge digestion tank is mainly composed of |
| A. | Nitrogen |
| B. | Carbon dioxide |
| C. | Hydrogen sulphide |
| D. | Methane |
| Answer» E. | |
| 104. |
In facultative stabilization pond, the sewage is treated by |
| A. | Aerobic bacteria only |
| B. | Algae only |
| C. | Dual action of aerobic bacteria and anaerobic bacteria |
| D. | Sedimentation |
| Answer» D. Sedimentation | |
| 105. |
In water treatment, rapid gravity filters are adopted to remove |
| A. | Dissolved organic substances |
| B. | Dissolved solids and dissolved gases |
| C. | Floating solids and dissolved inorganic solids |
| D. | Bacteria and colloidal solids |
| Answer» E. | |
| 106. |
As compared to cast iron pipes, steel pipes are |
| A. | Heavier |
| B. | Stronger |
| C. | Costlier |
| D. | Less susceptible to corrosion |
| Answer» C. Costlier | |
| 107. |
As compared to shallow wells, deep wells have |
| A. | More depth |
| B. | Less depth |
| C. | More discharge |
| D. | Less discharge |
| Answer» D. Less discharge | |
| 108. |
The correct relation between theoretical oxygen demand (TOD), Biochemical oxygen demand (BOD) and Chemical oxygen demand (COD) is given by |
| A. | TOD > BOD > COD |
| B. | TOD > COD > BOD |
| C. | BOD > COD > TOD |
| D. | COD > BOD > TOD |
| Answer» C. BOD > COD > TOD | |
| 109. |
Laying of sewers is usually done with the help of |
| A. | A Theodolite |
| B. | A compass |
| C. | Sight rails and boning rods |
| D. | A plane table |
| Answer» D. A plane table | |
| 110. |
If the total hardness of water is greater than its total alkalinity, the carbonate hardness will be equal to |
| A. | Total alkalinity |
| B. | Total hardness |
| C. | Total hardness total alkalinity |
| D. | Non carbonate hardness |
| Answer» B. Total hardness | |
| 111. |
Disinfection of water results in |
| A. | Removal of turbidity |
| B. | Removal of hardness |
| C. | Killing of disease bacteria |
| D. | Complete sterilisation |
| Answer» D. Complete sterilisation | |
| 112. |
The hourly variation factor is usually taken as |
| A. | 1.5 |
| B. | 1.8 |
| C. | 2.0 |
| D. | 2.7 |
| Answer» B. 1.8 | |
| 113. |
Standard EDTA (ethylene diamine tetra acetic acid) solution is used to determine the |
| A. | Hardness in water |
| B. | Turbidity in water |
| C. | Dissolved oxygen in water |
| D. | Residual chlorine in water |
| Answer» B. Turbidity in water | |
| 114. |
A sewer that receives the discharge of a number of house sewers is called |
| A. | House sewer |
| B. | Lateral sewer |
| C. | Intercepting sewer |
| D. | Sub-main sewer |
| Answer» C. Intercepting sewer | |
| 115. |
Most suitable section of sewer in separate sewage system is |
| A. | Rectangular section |
| B. | Circular section |
| C. | Standard form of egg shaped sewer |
| D. | Modified egg shaped section |
| Answer» C. Standard form of egg shaped sewer | |
| 116. |
An egg shaped section of sewer |
| A. | Is economical than circular section |
| B. | Provides self cleansing velocity at low discharges |
| C. | Is more stable than circular section |
| D. | Is easy to construct |
| Answer» C. Is more stable than circular section | |
| 117. |
The characteristics of fresh and septic sewage respectively are |
| A. | Acidic and alkaline |
| B. | Alkaline and acidic |
| C. | Both acidic |
| D. | Both alkaline |
| Answer» C. Both acidic | |
| 118. |
In chlorination, with the rise in temperature of water, death rate of bacteria |
| A. | Increases |
| B. | Decreases |
| C. | Remains unaffected |
| D. | None of the above |
| Answer» B. Decreases | |
| 119. |
Assertion A: The consumption of water increases with increase in the distribution pressure.Reason R: Higher distribution pressure causes more loss and waste of waterSelect your answer according to the coding system given below |
| A. | Both A and R is true and R is the correct explanation of A |
| B. | Both A and R is true but R is not the correct explanation of A |
| C. | A is true but R is false |
| D. | A is false but R is true |
| Answer» B. Both A and R is true but R is not the correct explanation of A | |
| 120. |
The suitable layout of a distribution system for irregularly growing town is |
| A. | Dead end system |
| B. | Grid iron system |
| C. | Radial system |
| D. | Ring system |
| Answer» B. Grid iron system | |
| 121. |
The commonly used material for water supply pipes, which has the properties of being strong, not easily corroded and long life but is heavy and brittle, is |
| A. | Steel |
| B. | Cast iron |
| C. | Copper |
| D. | Reinforced cement concrete |
| Answer» C. Copper | |
| 122. |
The water carriage system of collection of waste product |
| A. | Is cheaper in initial cost than dry conservancy system |
| B. | Requires treatment before disposal |
| C. | Creates hygienic problem |
| D. | All of the above |
| Answer» C. Creates hygienic problem | |
| 123. |
The phenolic compounds in public water supply should not be more than |
| A. | 0.1 ppm |
| B. | 0.01 ppm |
| C. | 0.001 ppm |
| D. | 0.0001 ppm |
| Answer» D. 0.0001 ppm | |
| 124. |
The means of access for inspection and cleaning of sewer line is known as |
| A. | Inlet |
| B. | Manhole |
| C. | Drop manhole |
| D. | Catch basin |
| Answer» C. Drop manhole | |
| 125. |
Residual chlorine in water is determined by |
| A. | Starch iodide method |
| B. | Orthotolidine method |
| C. | Both (A) and (B) |
| D. | None of the above |
| Answer» D. None of the above | |
| 126. |
The method of analysis of distribution system in which the domestic supply is neglected and fire demand is considered is |
| A. | Circle method |
| B. | Equivalent pipe method |
| C. | Electrical analysis method |
| D. | Hardy cross method |
| Answer» B. Equivalent pipe method | |
| 127. |
Corrosion in concrete sewers is caused by |
| A. | Septic conditions |
| B. | Dissolved oxygen |
| C. | Chlorine |
| D. | Nitrogen |
| Answer» B. Dissolved oxygen | |
| 128. |
Chlorine demand of water is equal to |
| A. | Applied chlorine |
| B. | Residual chlorine |
| C. | Sum of applied and residual chlorine |
| D. | Difference of applied and residual chlorine |
| Answer» E. | |
| 129. |
The effective size of sand particles used in slow sand filters is |
| A. | 0.25 to 0.35 mm |
| B. | 0.35 to 0.60 mm |
| C. | 0.60 to 1.00 mm |
| D. | 1.00 to 1.80 mm |
| Answer» B. 0.35 to 0.60 mm | |
| 130. |
The specific gravity of sewage is |
| A. | Much greater than 1 |
| B. | Slightly less than 1 |
| C. | Equal to 1 |
| D. | Slightly greater than 1 |
| Answer» E. | |
| 131. |
If Biochemical oxygen demand (BOD) of a town is 20000 kg/day and BOD per capita per day is 0.05 kg, then population equivalent of town is |
| A. | 1000 |
| B. | 4000 |
| C. | 1,00,000 |
| D. | 4,00,000 |
| Answer» E. | |
| 132. |
The layout of distribution system in which water flows towards the outer periphery is |
| A. | Ring system |
| B. | Dead end system |
| C. | Radial system |
| D. | Grid iron system |
| Answer» D. Grid iron system | |
| 133. |
Ground water is usually free from |
| A. | Suspended impurities |
| B. | Dissolved impurities |
| C. | Both suspended and dissolved impurities |
| D. | None of the above |
| Answer» B. Dissolved impurities | |
| 134. |
The most commonly used sewer under culverts is |
| A. | Circular brick sewer |
| B. | Circular cast iron sewer |
| C. | Semi-elliptical sewer |
| D. | Horseshoe type sewer |
| Answer» B. Circular cast iron sewer | |
| 135. |
On standard silica scale, the turbidity in drinking water should be limited to |
| A. | 10 ppm |
| B. | 20 ppm |
| C. | 30 ppm |
| D. | 50 ppm |
| Answer» B. 20 ppm | |
| 136. |
When there is no recirculation of sewage, then recirculation factor is |
| A. | 0 |
| B. | 1 |
| C. | Infinity |
| D. | None of the above |
| Answer» C. Infinity | |
| 137. |
The maximum discharge of a tube well is about |
| A. | 5 liters/sec |
| B. | 50 liters/sec |
| C. | 500 liters/sec |
| D. | 1000 liters/sec |
| Answer» C. 500 liters/sec | |
| 138. |
Turbidity is measured on |
| A. | Standard silica scale |
| B. | Standard cobalt scale |
| C. | Standard platinum scale |
| D. | Platinum cobalt scale |
| Answer» B. Standard cobalt scale | |
| 139. |
Settling velocity increases with |
| A. | Specific gravity of solid particles |
| B. | Size of particles |
| C. | Depth of tank |
| D. | Temperature of liquid |
| Answer» D. Temperature of liquid | |
| 140. |
The hydraulic mean depth (HMD) for an egg-shaped sewer flowing two-third full is |
| A. | Equal to HMD when flowing full |
| B. | Less than HMD when flowing full |
| C. | Greater than HMD when flowing full |
| D. | None of the above |
| Answer» D. None of the above | |
| 141. |
The main disadvantage of oxidation pond is that |
| A. | Large area is required for construction |
| B. | Maintenance and operation cost are high |
| C. | BOD removal is very low |
| D. | None of the above |
| Answer» B. Maintenance and operation cost are high | |
| 142. |
The chemical most commonly used to increase speed of sedimentation of sewage is |
| A. | Sulphuric acid |
| B. | Copper sulphate |
| C. | Lime |
| D. | Sodium permanganate |
| Answer» D. Sodium permanganate | |
| 143. |
Air binding phenomena in rapid sand filters occur due to |
| A. | Excessive negative head |
| B. | Mud ball formation |
| C. | Higher turbidity in the effluent |
| D. | Low temperature |
| Answer» B. Mud ball formation | |
| 144. |
The settling velocity of a particle in a sedimentation tank increases if |
| A. | Particle size is decreased |
| B. | The surface area of tank is increased |
| C. | The depth of tank is decreased |
| D. | None of the above |
| Answer» E. | |
| 145. |
Which of the following sewers is preferred for combined system of sewage? |
| A. | Circular sewer |
| B. | Egg shaped sewer |
| C. | Rectangular sewer |
| D. | None of the above |
| Answer» C. Rectangular sewer | |
| 146. |
Assertion A: Slow sand filters are more efficient in removal of bacteria than rapid sand filters.Reason R: The sand used in slow sand filters is finer than that in rapid sand filtersSelect your answer based on the coding system given below: |
| A. | Both A and R is true and R is the correct explanation of A |
| B. | Both A and R is true but R is not the correct explanation of A |
| C. | A is true but R is false |
| D. | A is false but R is true |
| Answer» B. Both A and R is true but R is not the correct explanation of A | |
| 147. |
The major disadvantage of lime soda process of water softening is that |
| A. | It is unsuitable for turbid and acidic water |
| B. | Huge amount of precipitate is formed which creates a disposal problem |
| C. | The effluent cannot be reduced to zero hardness |
| D. | It is unsuitable for softening the water of excessive hardness |
| Answer» C. The effluent cannot be reduced to zero hardness | |
| 148. |
The design discharge for the combined sewer system shall be taken as |
| A. | Equal to rainfall |
| B. | Rainfall + DWF |
| C. | Rainfall + 2 DWF |
| D. | Rainfall + 6 DWF |
| Answer» D. Rainfall + 6 DWF | |
| 149. |
The design discharge for the separate sewer system shall be taken as |
| A. | Equal to dry weather flow (DWF) |
| B. | 2 × DWF |
| C. | 3 × DWF |
| D. | 6 × DWF |
| Answer» E. | |
| 150. |
If the sewage contains grease and fatty oils, these are removed in |
| A. | Grit chambers |
| B. | Detritus tanks |
| C. | Skimming tanks |
| D. | Sedimentation tanks |
| Answer» D. Sedimentation tanks | |