McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Civil Engineering .
| 101. |
Which of the following option is incorrect about the sludges? |
| A. | Sludges are soft, loose and slimy precipitate |
| B. | They are non-adherent deposits and can be easily removed |
| C. | Formed generally at heated portions of the boiler |
| D. | Can be removed by blow down operation |
| Answer» C. Formed generally at heated portions of the boiler | |
| 102. |
The propulsion of water into steam drum by extremely rapid, almost explosive boiling of water at the heating surface is called ___________ |
| A. | Foaming |
| B. | Priming |
| C. | Corrosion |
| D. | Caustic embrittlement |
| Answer» B. Priming | |
| 103. |
The phenomenon during which the boiler material becomes brittle due to accumulation of caustic substances is known as ___________ |
| A. | Foaming |
| B. | Priming |
| C. | Corrosion |
| D. | Caustic embrittlement |
| Answer» D. Caustic embrittlement | |
| 104. |
Foaming is caused by the formation of ___________ |
| A. | Acids |
| B. | Alcohols |
| C. | Oils and alkalis |
| D. | Ketones |
| Answer» C. Oils and alkalis | |
| 105. |
The term ‘Sullage’ refers to: |
| A. | Fresh wastewater |
| B. | Septic wastewater |
| C. | Wastewater from kitchen, laundry |
| D. | Toxic wastewater |
| Answer» C. Wastewater from kitchen, laundry | |
| 106. |
Wastewater can become septic by the loss of: |
| A. | Dissolved oxygen content |
| B. | Carbon content |
| C. | Organic compounds |
| D. | Water content |
| Answer» A. Dissolved oxygen content | |
| 107. |
Which one of the below is not an attribute of drinking water? |
| A. | Aesthetics |
| B. | Economic |
| C. | Safety |
| D. | Source |
| Answer» D. Source | |
| 108. |
The extent of water treatment depends on how many factors? |
| A. | 5 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» B. 2 | |
| 109. |
What is added to the water treatment tank to settle the colloidal particles? |
| A. | Alum |
| B. | Alum and lime |
| C. | Lime |
| D. | Potash |
| Answer» B. Alum and lime | |
| 110. |
Disinfection of water in our country is mainly done by ____________ |
| A. | Oxygenation |
| B. | Hydration |
| C. | Chlorination |
| D. | Filtration |
| Answer» C. Chlorination | |
| 111. |
Which minerals and in what form are present in ground water? |
| A. | Fe & Mn in Ferrous and Manganous |
| B. | Fe & Cu in Ferric and Cupric |
| C. | Fe & Mn in Ferric and manganous |
| D. | Cu & Mn in Cuprous and manganous |
| Answer» A. Fe & Mn in Ferrous and Manganous | |
| 112. |
How many types of wastewater treatment plants are there based on the type of wastewater? |
| A. | 5 |
| B. | 4 |
| C. | 2 |
| D. | 3 |
| Answer» D. 3 | |
| 113. |
On how many conditions does the intervention of wastewater depend on? |
| A. | 5 |
| B. | 7 |
| C. | 6 |
| D. | 4 |
| Answer» B. 7 | |
| 114. |
The surface water quality is affected by _______ and infiltration from rainfall. |
| A. | Precipitation |
| B. | Run off |
| C. | Wetlands |
| D. | Farming |
| Answer» B. Run off | |
| 115. |
_________ are constructed for water supply, electricity generation, recreation, irrigation and others. |
| A. | Swimming pools |
| B. | Ponds |
| C. | Reservoirs |
| D. | Tanks |
| Answer» C. Reservoirs | |
| 116. |
What is the next step after water abstraction in wastewater treatment? |
| A. | Supply to consumers |
| B. | Treatment |
| C. | Combine with stormwater |
| D. | Supply to receiving body |
| Answer» B. Treatment | |
| 117. |
Which of the following requires aesthetically pleasant water? |
| A. | Domestic use |
| B. | Industrial use |
| C. | Irrigation |
| D. | Aquaculture |
| Answer» B. Industrial use | |
| 118. |
The addition of substances or energy forms that directly or indirectly alter the nature of the water body is called? |
| A. | Water contamination |
| B. | Water pollution |
| C. | Sanitation |
| D. | Water treatment |
| Answer» B. Water pollution | |
| 119. |
What is the type of pollution where the pollutants reach the water body in points called? |
| A. | Point-source pollution |
| B. | Diffuse pollution |
| C. | Point-source contamination |
| D. | Diffuse contamination |
| Answer» A. Point-source pollution | |
| 120. |
What percentage of solids does wastewater contain? |
| A. | 0.5% |
| B. | 5% |
| C. | 0.1% |
| D. | 1% |
| Answer» C. 0.1% | |
| 121. |
What is the growth of huge amounts of algae and other aquatic plants leading to the deterioration of the water quality called? |
| A. | Eutrophication |
| B. | Algae growth |
| C. | Nitrification |
| D. | Denitrification |
| Answer» A. Eutrophication | |
| 122. |
The optimum temperature for bacterial activity is in what range? |
| A. | 25-35 degree Celsius |
| B. | 50 degree Celsius |
| C. | 20 degree Celsius |
| D. | 40 degree Celsius |
| Answer» A. 25-35 degree Celsius | |
| 123. |
The fluoride concentration for prevention of dental caries is ____________ |
| A. | 1mg/l |
| B. | 2mg/l |
| C. | 3mg/l |
| D. | 4mg/l |
| Answer» A. 1mg/l | |
| 124. |
In which process, the fluoride content of water is raised? |
| A. | Chlorination |
| B. | Fluoridation |
| C. | Defluoridation |
| D. | Flocculation |
| Answer» B. Fluoridation | |
| 125. |
Which of the following is not used as a fluoride compound? |
| A. | Sodium fluoride |
| B. | Sodium silico fluoride |
| C. | Hydrofluosilicic acid |
| D. | Sodium fluro carbonate |
| Answer» D. Sodium fluro carbonate | |
| 126. |
Which of the following is the pure compound? |
| A. | Sodium fluoride |
| B. | Sodium silico fluoride |
| C. | Hydrofluosilicic acid |
| D. | Sodium fluro carbonate |
| Answer» A. Sodium fluoride | |
| 127. |
As far as safer handling is considered, which of the following is used for fluoridation? |
| A. | Sodium fluoride |
| B. | Sodium silico fluoride |
| C. | Hydrofluosilicic acid |
| D. | Sodium fluro carbonate |
| Answer» C. Hydrofluosilicic acid | |
| 128. |
What happens when water contains 8-20 ppm of fluoride concentration? |
| A. | Blue baby disease |
| B. | Crippling fluorosis |
| C. | Dental fluorosis |
| D. | Mottling of teeth |
| Answer» B. Crippling fluorosis | |
| 129. |
The process of reducing the fluoride content from water is called _____ |
| A. | Chlorination |
| B. | Fluoridation |
| C. | Defluoridation |
| D. | Flocculation |
| Answer» C. Defluoridation | |
| 130. |
Which of the following is not used for defluoridation? |
| A. | Calcium phosphate |
| B. | Copper sulfate |
| C. | Alum |
| D. | Bone charcoal |
| Answer» B. Copper sulfate | |
| 131. |
At which temperature, the bone is calcinated during defluoridation with calcium phosphate? |
| A. | 100-200oC |
| B. | 200-300oC |
| C. | 400-600oC |
| D. | 500-800oC |
| Answer» C. 400-600oC | |
| 132. |
One cubic metre of bone can treat how much quantity of water containing 3.5 ppm of fluoride? |
| A. | 10m3 |
| B. | 100m3 |
| C. | 1000m3 |
| D. | 10000m3 |
| Answer» B. 100m3 | |
| 133. |
Which material is used in contact filters for the removal of fluorides? |
| A. | Calcium phosphate |
| B. | Copper sulfate |
| C. | Synthetic tri-calcium phosphate |
| D. | Bone charcoal |
| Answer» C. Synthetic tri-calcium phosphate | |
| 134. |
Which material is used for removing fluorides from hard water containing 3ppm of fluorides? |
| A. | Lime |
| B. | Copper sulfate |
| C. | Synthetic tri-calcium phosphate |
| D. | Bone charcoal |
| Answer» A. Lime | |
| 135. |
Fluorex is a special mixture of ____________ |
| A. | Di-calcium phosphate and carbon |
| B. | Tri-calcium phosphate and hydroxyapatite |
| C. | Di-calcium phosphate and phosphoric acid |
| D. | Tri-calcium phosphate and carbon |
| Answer» B. Tri-calcium phosphate and hydroxyapatite | |
| 136. |
Which of these materials is not added to iron for improving its oxidation resistance? |
| A. | Nickel |
| B. | Chromium |
| C. | Aluminum |
| D. | Silicon |
| Answer» D. Silicon | |
| 137. |
How much chromium is required to provide oxidation resistance for use over 1000oC? |
| A. | 1% |
| B. | 6% |
| C. | 12% |
| D. | 17% |
| Answer» D. 17% | |
| 138. |
Molybdenum with hydrogen can be used up to ________ |
| A. | 1000oC |
| B. | 1500oC |
| C. | 2000oC |
| D. | 4000oC |
| Answer» B. 1500oC | |
| 139. |
% chromium mixed with ______ can be used up to 1100oC. |
| A. | Nickel |
| B. | Chromium |
| C. | Aluminum |
| D. | Silicon |
| Answer» A. Nickel | |
| 140. |
Which of these metals does not require alloying for oxidation resistance? |
| A. | Iron |
| B. | Copper |
| C. | Aluminum |
| D. | Molybdenum |
| Answer» C. Aluminum | |
| 141. |
_________ is used to prevent duralumin from corrosion. |
| A. | Iron |
| B. | Kynal |
| C. | Titanium |
| D. | Alclad |
| Answer» D. Alclad | |
| 142. |
Galvanized ion is made by dipping low carbon steel in molten zinc at ________ |
| A. | 100oC |
| B. | 150oC |
| C. | 200oC |
| D. | 450oC |
| Answer» D. 450oC | |
| 143. |
Which of these is not a way to prevent intergranular corrosion? |
| A. | Reduction of carbon level |
| B. | Quenching |
| C. | Addition of carbide forming elements |
| D. | Reduction of alloying elements |
| Answer» D. Reduction of alloying elements | |
| 144. |
Dezincification of brass is prevented by addition of ________ |
| A. | Nickel |
| B. | Zinc |
| C. | Arsenic |
| D. | Tungsten |
| Answer» C. Arsenic | |
| 145. |
Season-cracking can be prevented by cold-working of brass at _________ |
| A. | 15oC |
| B. | 100oC |
| C. | 300oC |
| D. | 550oC |
| Answer» C. 300oC | |
| 146. |
How can caustic embrittlement be avoided? |
| A. | Addition of nickel |
| B. | Increasing potential |
| C. | Decreasing carbon |
| D. | Adding tannins |
| Answer» D. Adding tannins | |
| 147. |
A grit chamber is usually installed ______ primary sedimentation tanks. |
| A. | Before |
| B. | After |
| C. | In between |
| D. | In |
| Answer» A. Before | |
| 148. |
At what velocity will the particles settle down? |
| A. | 0.5 m/s |
| B. | 0.3 m/s |
| C. | 0.1 m/s |
| D. | 0.25 m/s |
| Answer» B. 0.3 m/s | |
| 149. |
Grit chambers are constructed to prevent their accumulation in _______ |
| A. | Sedimentation tank |
| B. | Sludge digesters |
| C. | Coagulation tank |
| D. | Sand filter |
| Answer» B. Sludge digesters | |
| 150. |
What is the cleaning period for manual grit chambers? |
| A. | 3 days |
| B. | 5 days |
| C. | 48 hours |
| D. | 1 week |
| Answer» D. 1 week | |
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