MCQOPTIONS
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MCQOPTIONS
This section includes 295 Mcqs, each offering curated multiple-choice questions to sharpen your Public Health Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 101. |
The artesian spring has too much hydraulic gradient and water flows out automatically. |
| A. | Right |
| B. | Wrong |
| Answer» B. Wrong | |
| 102. |
When manganese is present in water, it reduces the degree of hardness. |
| A. | Yes |
| B. | No |
| Answer» C. | |
| 103. |
The lower portion of a manhole is is known as |
| A. | access shaft |
| B. | base |
| C. | working chamber |
| D. | cover |
| Answer» F. | |
| 104. |
Aerobic bacterias takes place in the |
| A. | presence |
| B. | absence |
| Answer» B. absence | |
| 105. |
The layers such as sand and gravel which allow the water to pass through them are known as |
| A. | previous layers |
| B. | aquifers |
| C. | water bearing strata |
| D. | all of these |
| Answer» E. | |
| 106. |
The natural process in which the oxygen of water of streams is consumed by sewage and at the same time, it is replenished (filled again) by the atmosphere, is known as |
| A. | oxidation |
| B. | deoxidation |
| C. | self purification |
| D. | sedimentation |
| Answer» D. sedimentation | |
| 107. |
The yield of a rapid sand filter is |
| A. | 10 times |
| B. | 15 times |
| C. | 20 times |
| D. | 30 times |
| Answer» E. | |
| 108. |
Pre-chlorination |
| A. | improves coagulation |
| B. | reduces odours |
| C. | reduces tastes |
| D. | all of these |
| Answer» E. | |
| 109. |
Turbidity of water is expressed in terms of |
| A. | silica scale |
| B. | platinum cobalt scale |
| C. | pO value |
| D. | none of these |
| Answer» B. platinum cobalt scale | |
| 110. |
The yield of a surface stream may be obtained by |
| A. | cross-section velocity method |
| B. | strem gauging |
| C. | chemical method |
| D. | all of these |
| Answer» E. | |
| 111. |
The activated sludge process of sewage treatment |
| A. | requires smaller area for construction of whole unit |
| B. | requires smaller water head for operation than trickling filters |
| C. | has high efficiency |
| D. | all of the above |
| Answer» E. | |
| 112. |
The water which leaks into sewers from the ground is termed as infiltration. |
| A. | Yes |
| B. | No |
| Answer» B. No | |
| 113. |
The vertical wells provided along the banks of a river to draaw ground water in dry season are called |
| A. | Open wells |
| B. | tube wells |
| C. | artesian wells |
| D. | infiltration wells |
| Answer» E. | |
| 114. |
A valve which allows the water to flow in one direction but prevents its flow in the reverse direction, is known as |
| A. | sluice valve |
| B. | reflux valve |
| C. | air relief valve |
| D. | pressure relief valve |
| Answer» C. air relief valve | |
| 115. |
When the pO value of water is 5, then it has |
| A. | no perceptible odour |
| B. | distinct odour |
| C. | faint odour |
| D. | extremely strong odour |
| Answer» E. | |
| 116. |
Air binding means accumulation of |
| A. | air |
| B. | impurities |
| Answer» B. impurities | |
| 117. |
The temporary hardness in water is cused due to the salts like |
| A. | chlorides |
| B. | nitrates |
| C. | carbonates |
| D. | sulphates |
| Answer» D. sulphates | |
| 118. |
Bio-chemical oxygen demand (B.O.D.) of safe drinking water must be |
| A. | 0 |
| B. | 10 |
| C. | 50 |
| D. | 100 |
| Answer» B. 10 | |
| 119. |
Grit chambers are used to remove sand and other organic matter from sewage. |
| A. | Agree |
| B. | Disagree |
| Answer» B. Disagree | |
| 120. |
The process of dechlorination is followed by |
| A. | pre-chlorination |
| B. | post cholorination |
| C. | super chlorination |
| D. | double chlorination |
| Answer» D. double chlorination | |
| 121. |
The arithmetical increase method of forecasting population gives |
| A. | same value |
| B. | lesser value |
| C. | higher value |
| Answer» C. higher value | |
| 122. |
Crystalline hydrates of 'Ice" of chlorine are formed at a temerature of |
| A. | below 10?C |
| B. | 15?C |
| C. | 20?C |
| D. | above 20?C |
| Answer» B. 15?C | |
| 123. |
The yield of a underground source may be obtained by |
| A. | pumping test |
| B. | recupating test |
| C. | both (a) and (b) |
| D. | none of these |
| Answer» D. none of these | |
| 124. |
For house drainage and lateral connections, we shall use |
| A. | stone ware sewers |
| B. | cast iron sewers |
| C. | concrete sewers |
| D. | masonry sewers |
| Answer» B. cast iron sewers | |
| 125. |
pH value is a symbol for |
| A. | magnesium |
| B. | hydrogen |
| C. | calcium |
| D. | sodium |
| Answer» C. calcium | |
| 126. |
The permanent hardness of water can be removed by |
| A. | adding alum |
| B. | adding chlorine |
| C. | boiling |
| D. | zeolite process |
| Answer» E. | |
| 127. |
The amount of water collected in a reservoir is divided into three portions and the order of their existance from bottom to the top is |
| A. | useful storage, surcharge storage, dead storage |
| B. | useful storage, dead storage, surcharge storage |
| C. | dead storage, useful storage, surcharge storage |
| D. | none of the above |
| Answer» D. none of the above | |
| 128. |
Aluminium sulphate may be used for coagulation. |
| A. | Correct |
| B. | Incorrect |
| Answer» B. Incorrect | |
| 129. |
The maximum permissible turbidity for domestic supplies, on silica scale is |
| A. | 5 to 10 ppm |
| B. | 10 to 20 ppm |
| C. | 20 to 30 ppm |
| D. | 30 to 40 ppm |
| Answer» B. 10 to 20 ppm | |
| 130. |
The open wells or dug wells wells |
| A. | act as a small storage reservoir |
| B. | are suitable for a small discharge |
| C. | are cheap in construction |
| D. | all of these |
| Answer» E. | |
| 131. |
When the pH value of water is |
| A. | equal to 7 |
| B. | less than 7 |
| C. | more than 7 |
| Answer» C. more than 7 | |
| 132. |
House plumbing is difficult in |
| A. | separate |
| B. | combined |
| Answer» B. combined | |
| 133. |
In Zeolite process |
| A. | no sludge is formed |
| B. | water of varying quality can be treated |
| C. | ferrous and manganese from water are removed |
| D. | all of tha above |
| Answer» E. | |
| 134. |
By lime soda process, hardness can be reduced to less than |
| A. | 50 ppm |
| B. | 75 ppm |
| C. | 100 ppm |
| D. | 150 ppm |
| Answer» B. 75 ppm | |
| 135. |
Disposal by dilution will be suitable where |
| A. | there are strong forward currents |
| B. | there is no back currents |
| C. | the sewage arriving at the out fall point is fresh and non-septic |
| D. | all of the above |
| Answer» E. | |
| 136. |
The maximum permissible colour for domestic supplies, on platinum cobalt scale is |
| A. | 5 to 10 ppm |
| B. | 10 to 20 ppm |
| C. | 20 to 30 ppm |
| D. | 30 to 40 ppm |
| Answer» C. 20 to 30 ppm | |
| 137. |
B-coli or E-coli are harmless organisms but their presence in water indicates the |
| A. | presence of pathogenic bacteria |
| B. | absence of pathogenic bacteria |
| C. | presence of non-pathogenic bacteria |
| D. | absence of non-pathogenic bacteria |
| Answer» B. absence of pathogenic bacteria | |
| 138. |
The copper contents in water for domestic purposes should not be |
| A. | less than |
| B. | more than |
| Answer» C. | |
| 139. |
The maximum permissible quantity of iron and manganese in water for domestic purposes should be |
| A. | 0.1 ppm |
| B. | 0.3 ppm |
| C. | 0.6 ppm |
| D. | 0.8 ppm |
| Answer» C. 0.6 ppm | |
| 140. |
The total count of bacteria per cubic centimetre for domestic purposes varies from |
| A. | 0 to 100 |
| B. | 100 to 150 |
| C. | 150 to 200 |
| D. | 200 to 250 |
| Answer» B. 100 to 150 | |
| 141. |
The temporary hardness due to calcium bicarbonates can be removed by |
| A. | boiling |
| B. | lime process |
| C. | lime-soda process |
| D. | zeolite process |
| Answer» B. lime process | |
| 142. |
The presence of bacteria in water causes |
| A. | hardness |
| B. | alkalinity |
| C. | diseases |
| D. | bad taste |
| Answer» D. bad taste | |
| 143. |
The presence of hydrogen sulphide in water causes |
| A. | softening |
| B. | alkalinity |
| C. | aciity |
| D. | bad taste |
| Answer» D. bad taste | |
| 144. |
Calcium sulphate present in water causes corrosion. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 145. |
The residual chlorine |
| A. | is zero |
| B. | is maximum |
| C. | reappears |
| Answer» D. | |
| 146. |
When a pervious strata is sandwitched between two impervious strata of cup shape, the well is called a tube well. |
| A. | True |
| B. | False |
| Answer» C. | |
| 147. |
The method adopted for removing, bushes branches, debries etc. from water is known as |
| A. | sedimentation |
| B. | coagulation |
| C. | screening |
| D. | filteration |
| Answer» D. filteration | |
| 148. |
The void spaces in the filtering material act like a |
| A. | drain |
| B. | inlet |
| C. | tiny settling basins |
| D. | outlet |
| Answer» D. outlet | |
| 149. |
The leakage of sewage from the sewer into the soil surrounding the water is called ex-filtration. |
| A. | Agree |
| B. | Disagree |
| Answer» B. Disagree | |
| 150. |
The growth of population may be conveniently represented by |
| A. | semi-logarthmic curve |
| B. | logistic curve |
| C. | straight line curve |
| D. | all of these |
| Answer» C. straight line curve | |