MCQOPTIONS
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MCQOPTIONS
This section includes 180 Mcqs, each offering curated multiple-choice questions to sharpen your Environmental Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 101. |
Which of the following is correctly paired in the following figure? |
| A. | C – Impeller |
| B. | D – Outlet |
| C. | F – Deflecting wall |
| D. | E – Impeller |
| Answer» E. | |
| 102. |
What will be the surface area of the basin for a flow of 2*10⁶ litre per day having a surface loading rate 10,000 litre/day/m²? |
| A. | 100 |
| B. | 200 |
| C. | 300 |
| D. | 400 |
| Answer» C. 300 | |
| 103. |
The design value of surface loading for horizontal flow circular sedimentation is _______ |
| A. | 30-40m³/m²/d |
| B. | 20-30m³/m²/d |
| C. | 10-20m³/m²/d |
| D. | 50-100m³/m²/d |
| Answer» B. 20-30m³/m²/d | |
| 104. |
Settling tank efficiency is reduced by _______i. Eddy currentii. Surface currentiii. Density current |
| A. | i, ii |
| B. | i, ii, iii |
| C. | ii, iii |
| D. | i, iii |
| Answer» C. ii, iii | |
| 105. |
1cm per second settling velocity corresponds to a surface loading of ______ litre per day per m². |
| A. | 36000 |
| B. | 864000 |
| C. | 24000 |
| D. | 6000 |
| Answer» C. 24000 | |
| 106. |
The thickness of Anthracite used in dual media filter is __________ |
| A. | 10-20cm |
| B. | 20-30cm |
| C. | 30-40cm |
| D. | 40-50cm |
| Answer» D. 40-50cm | |
| 107. |
The chemical composition of Alum is _____________ |
| A. | Al₂ (SO₄)₃.18H₂O |
| B. | Al₂ (SO₄)₂.18H₂O |
| C. | Al₃ (SO₄)₂.18H₂O |
| D. | Al₄ (SO₄)₃.18H₂O |
| Answer» B. Al₂ (SO₄)₂.18H₂O | |
| 108. |
The chemical compound which is insoluble in water, formed when alum is added to water is _____________ |
| A. | Al (OH)₃ |
| B. | CaSO₄ |
| C. | CO₂ |
| D. | Ca (OH)₃ |
| Answer» B. CaSO₄ | |
| 109. |
What is formed when coagulant is added to water? |
| A. | Scum |
| B. | Soap |
| C. | Bubbles |
| D. | Floc |
| Answer» E. | |
| 110. |
Settling velocity of a spherical body in a viscous fluid is given by ___________ |
| A. | Reynolds law |
| B. | Newton’s law |
| C. | Stokes law |
| D. | Charles law |
| Answer» D. Charles law | |
| 111. |
The time period for which the water is stored in a sedimentation tank is called _____ |
| A. | Time of flow |
| B. | Frequency of flow |
| C. | Settling time |
| D. | Detention period |
| Answer» E. | |
| 112. |
What is the settling velocity of the particle if its diameter is 2 * 10⁻³cm. Given G=2.65, viscosity v=8 * 10⁻³cm²/Sec? |
| A. | 0.01cm/Sec |
| B. | 0.13cm/Sec |
| C. | 0.24cm/Sec |
| D. | 0.36cm/Sec |
| Answer» C. 0.24cm/Sec | |
| 113. |
The settling velocity of spherical particle is given by ____________ |
| A. | Darcy Weisbach equation |
| B. | Hazen and William equation |
| C. | Stokes equation |
| D. | Bernoulli’s equation |
| Answer» D. Bernoulli’s equation | |
| 114. |
The deviation from the ideal flow of wastewater in the sedimentation tank causes ____________ |
| A. | Whirlpool |
| B. | Increase in tank efficiency |
| C. | Short circuiting |
| D. | Coagulation |
| Answer» D. Coagulation | |
| 115. |
____ represents the size of sand particle such that 10% of particles are finer than this size. |
| A. | D₀ꓸ₁ |
| B. | D₁ |
| C. | D₁₀ |
| D. | D₁₀₀ |
| Answer» D. D₁₀₀ | |
| 116. |
What is the effective size of Anthracite when used as a filter material? |
| A. | 0.1-0.2mm |
| B. | 0.2-0.4mm |
| C. | 0.4-0.6mm |
| D. | 0.7-0.75mm |
| Answer» E. | |
| 117. |
The diameter of the vertical type pressure filter is __________ |
| A. | 2-2.5 m |
| B. | 1 m |
| C. | 5 m |
| D. | 10 m |
| Answer» B. 1 m | |
| 118. |
Which of the following is the expression of the Carmen equation where symbols have their usual meanings? |
| A. | hf = f* (L/(s *d)) * ((1-e)/e³) * (v²/g) |
| B. | hf = f* (L/(s *d)) * ((1-e)/e³) * (v/g) |
| C. | hf = f* (L/(s *d)) * ((1-e)/e) * (v²/g) |
| D. | hf = f* (L/(s *d)) * ((1-e)/e²) * (v²/g) |
| Answer» B. hf = f* (L/(s *d)) * ((1-e)/e³) * (v/g) | |
| 119. |
The sedimentation basin should be made as deep as possible. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | Can't say |
| Answer» C. May be True or False | |
| 120. |
The slow sand filter is designed for _____________ |
| A. | Maximum daily demand |
| B. | Maximum yearly demand |
| C. | Average daily demand |
| D. | Maximum weekly demand |
| Answer» B. Maximum yearly demand | |
| 121. |
Which device is used to supply air for the agitation of sand grains during washing of filters? |
| A. | Rate control device |
| B. | Tube settlers |
| C. | Air compressors |
| D. | Flocculator |
| Answer» D. Flocculator | |
| 122. |
_______ type of trouble in filter is caused by the released of dissolved air and gases from water. |
| A. | Air binding |
| B. | Clogging |
| C. | Mud balls |
| D. | Jetting |
| Answer» B. Clogging | |
| 123. |
What is the frequency of cleaning of a slow sand filter? |
| A. | 1 week |
| B. | 1-3 months |
| C. | 2-3 days |
| D. | 2-3 weeks |
| Answer» C. 2-3 days | |
| 124. |
_______ is formed when alum is added to sewage. |
| A. | Acid |
| B. | Floc |
| C. | Salt |
| D. | Base |
| Answer» C. Salt | |
| 125. |
______ are formed in filters due to insufficient washing of sand grains. |
| A. | Sand boils |
| B. | Mud balls |
| C. | Clogging |
| D. | Bubbles |
| Answer» C. Clogging | |
| 126. |
Range of Displacement efficiency in the plain sedimentation tank is ___________ |
| A. | 0.25-0.5 |
| B. | 0.1-0.2 |
| C. | 0.5-0.8 |
| D. | 0.3-0.6 |
| Answer» B. 0.1-0.2 | |
| 127. |
The quantity of water flowing per hour per unit horizontal area is called ________ |
| A. | Detention time |
| B. | Flowing through period |
| C. | Displacement time |
| D. | Overflow rate |
| Answer» E. | |
| 128. |
The average time required by water to pass through the settling tank is called _______ |
| A. | Detention time |
| B. | Flowing through period |
| C. | Time of flow |
| D. | Mean time |
| Answer» C. Time of flow | |
| 129. |
Which of the following represents the correct relation between displacement velocity and diameter of the particle? |
| A. | v1 = (8Bg (G-1) d/f)^1/2 |
| B. | v1 = (8Bg (G-1) d2/f)² |
| C. | v1 = (8Bg (G-1) d/f) |
| D. | v1 = (8Bg (G-1) d/f)² |
| Answer» B. v1 = (8Bg (G-1) d2/f)² | |
| 130. |
The detention period of a rectangular tank is given by _______ |
| A. | t0 = LBH/Q |
| B. | t0 = LB/HQ |
| C. | t0 = Q/LBH |
| D. | t0 = HQ/LB |
| Answer» B. t0 = LB/HQ | |
| 131. |
Consider the following statement regarding the depth of sand of the rapid gravity filter?i. It should be checked against breakage of flocii. The sand depth should lie between 100-200cmiii. The floc should be attached through the sand bedWhich of the above statement is/are correct? |
| A. | Only i |
| B. | i, ii |
| C. | ii, iii |
| D. | Only ii |
| Answer» B. i, ii | |
| 132. |
The area of the filter is 1500. What is the number of beds to be provided? |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 6 |
| Answer» C. 3 | |
| 133. |
Schmutzdecke acts as an extremely fine meshed straining mat. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | Can't say |
| Answer» B. False | |
| 134. |
What is the normal value of the detention period adopted in a flocculator for design purpose? |
| A. | 30min |
| B. | 60min |
| C. | 90min |
| D. | 100min |
| Answer» B. 60min | |
| 135. |
In which type of settling, sedimentation of discrete particles takes place? |
| A. | Zone settling |
| B. | Compression settling |
| C. | Hindered settling |
| D. | Discrete settling |
| Answer» E. | |
| 136. |
In which action of filtration, colloidal particles are removed? |
| A. | Mechanical Straining |
| B. | Sedimentation |
| C. | Biological mechanism |
| D. | Electrolytic action |
| Answer» C. Biological mechanism | |
| 137. |
When the loss of the head exceeds the static head, the head becomes _____ |
| A. | Positive |
| B. | Negative |
| C. | Constant |
| D. | Zero |
| Answer» C. Constant | |
| 138. |
The finer the suspended impurities to be removed ___________ |
| A. | Larger will be the sand size |
| B. | Smaller will be the sand size |
| C. | Smaller will be the surface area of sand grains |
| D. | Narrow will be the sand depth of the bed |
| Answer» C. Smaller will be the surface area of sand grains | |
| 139. |
What is the settling velocity of the particle in the wastewater if its diameter is 2 * 10⁻³ cm. Given G=2.65, viscosity v=8 * 10⁻³ cm²/Sec? |
| A. | 0.01cm/Sec |
| B. | 0.13cm/Sec |
| C. | 0.24cm/Sec |
| D. | 0.36cm/Sec |
| Answer» C. 0.24cm/Sec | |
| 140. |
Rapid sand filters are very efficient in removal of color. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | Can't say |
| Answer» B. False | |
| 141. |
The thickness of the base material of a rapid sand filter on which filter media are supported is __________ |
| A. | 45-60cm |
| B. | 20-80cm |
| C. | 30-75cm |
| D. | 10-30cm |
| Answer» B. 20-80cm | |
| 142. |
Detention time for a circular tank is given by _______ |
| A. | t = D (D + 0.785H) /Q |
| B. | t = D (0.1D + 0.785H) /Q |
| C. | t = D2 (0.01D + 0.785H) |
| D. | t = D2 (0.01D + 0.785H) /Q |
| Answer» E. | |
| 143. |
In which type of filtration problem, layers of gravel are displaced? |
| A. | Clogging |
| B. | Air binding |
| C. | Sand incrustation |
| D. | Sand leakage |
| Answer» E. | |
| 144. |
When the Reynolds number is greater than 1.9 but less than 500, the coefficient of drag CD is? |
| A. | CD = 24/R |
| B. | CD = R/24 |
| C. | CD = 18.5/R⁰·⁶ |
| D. | CD = R⁰·⁶/18.5 |
| Answer» D. CD = R⁰·⁶/18.5 | |
| 145. |
The chemical composition of Chlorinated Copperas is __________ |
| A. | Fe₂ (SO₄)₃ + FeCl₃ |
| B. | FeSO₄.9H₂O |
| C. | FeSO₄.18H₂O |
| D. | Fe₂ (SO₄)₃ |
| Answer» B. FeSO₄.9H₂O | |
| 146. |
Alum is effective when pH of water is between ____ |
| A. | 8-10 |
| B. | 6-8 |
| C. | 6.5-8.5 |
| D. | 7-9 |
| Answer» D. 7-9 | |
| 147. |
Why Alum is preferred over other coagulants? |
| A. | It is easy to dewater the sludge formed |
| B. | It imparts corrosiveness to water |
| C. | It reduces taste and odor in addition to turbidity |
| D. | The time required for floc formation is less |
| Answer» D. The time required for floc formation is less | |
| 148. |
Which gas is released when alum is added to water? |
| A. | Al (OH)₃ |
| B. | CaSO₄ |
| C. | CO₂ |
| D. | Ca (OH)₃ |
| Answer» D. Ca (OH)₃ | |
| 149. |
What indicates the permanent hardness when alum is added to water? |
| A. | Al (OH)₃ |
| B. | CaSO₄ |
| C. | CO₂ |
| D. | Ca (OH)₃ |
| Answer» C. CO₂ | |
| 150. |
The rate of filtration of pressure filtration is ______ l/m²/hour. |
| A. | 1000-5000 |
| B. | 5000-10000 |
| C. | 6000-8000 |
| D. | 6000-15000 |
| Answer» E. | |