MCQOPTIONS
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MCQOPTIONS
This section includes 292 Mcqs, each offering curated multiple-choice questions to sharpen your Applied Chemistry knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
The fire demand for ascertaining the empirical formula 1136.5 [(P/10) + 10] known as |
| A. | Kuichling's formula |
| B. | Buston's formula |
| C. | Freeman formula |
| D. | Under Writers formula |
| Answer» D. Under Writers formula | |
| 52. |
For the same draw down in two observations wells at distances r1 and r2, the times after startof pumping are t1 and t2 hours respectively. The relation which holds good is |
| A. | t2 = r2/r1 × t1 |
| B. | t2 = (r2/r1)² × t1 |
| C. | t2 = (r2/r1)3× t1 |
| D. | t2 = (r2/r1) × t12 |
| Answer» C. t2 = (r2/r1)3× t1 | |
| 53. |
An earth formation which, although porous and capable of absorbing water does not provide anappreciable supply to wells, is known as |
| A. | Aquifer |
| B. | Aquiclude |
| C. | Aquifuge |
| D. | None of these |
| Answer» C. Aquifuge | |
| 54. |
While designing a water supply of an industrial township, industrial and commercial waterdemand of total supply, is assumed |
| A. | 10 % (B) (C) (D) |
| B. | 10 to 15 % |
| C. | 15 to 20 % |
| D. | 20 to 25 % |
| Answer» E. | |
| 55. |
In slow sand filters, the turbidity of raw water can be removed only up to |
| A. | 60 mg/litre |
| B. | 75 mg/litre |
| C. | 100 gm/litre |
| D. | 150 mg/litre |
| Answer» B. 75 mg/litre | |
| 56. |
If intensity of rainfall in cm per hour is I, percentage coefficient of run-off is P, area of catchmentin square kilometres is A, the total run-off Q, is given by |
| A. | Q = 1.758 × 102× API (B) (C) (D) |
| B. | Q = 2.758 × 102× API |
| C. | Q = 2.758 × 103× API |
| D. | Q = 2.758 × 103× A/PI |
| Answer» D. Q = 2.758 × 103× A/PI | |
| 57. |
From the surface of reservoir, evaporation may be minimized by sprinkling |
| A. | Spirit |
| B. | Hydrochloric acid |
| C. | Acetyl alcohol |
| D. | Methane |
| Answer» D. Methane | |
| 58. |
A strainer type well sunk through three previous layers intervened by three imperviousaquicludes, draws water from |
| A. | Top most pervious layer |
| B. | Central pervious layer |
| C. | Lowest pervious layer |
| D. | All the pervious layers |
| Answer» E. | |
| 59. |
The standard B.O.D. at 20°C, is taken for the consumption in |
| A. | 2 days |
| B. | 3 days |
| C. | 4 days |
| D. | 5 days |
| Answer» E. | |
| 60. |
In a city the ratio of the drainage to sewage is 20, the percentage discharge passing throughnonmonsoon periods, is |
| A. | 5 |
| B. | 10 |
| C. | 15 |
| D. | 20 |
| Answer» E. | |
| 61. |
For determining the velocity of flow of underground water, the most commonly usednonempirical formula is |
| A. | Darcy's formula |
| B. | Slichter's formula |
| C. | Hazen's formula |
| D. | Lacy's formula |
| Answer» B. Slichter's formula | |
| 62. |
If ‘D’ is the diameter of upper circular portion, the overall depth of New Egg shaped sewersection, is |
| A. | 1.250 D |
| B. | 1.350 D |
| C. | 1.425 D |
| D. | 1.625 D |
| Answer» E. | |
| 63. |
If “D” is the diameter of upper circular portion, the overall depth of New Egg shaped sewersection, is |
| A. | 1.250 D |
| B. | 1.350 D |
| C. | 1.425 D |
| D. | 1.625 D |
| Answer» E. | |
| 64. |
The CWA reduced the amount of pollution from _________ |
| A. | Point sources |
| B. | Non-point sources |
| C. | Chemicals |
| D. | Mining |
| Answer» B. Non-point sources | |
| 65. |
The residual hardness in ion-exchange process is ____________ |
| A. | 0-2 ppm |
| B. | 5-10 ppm |
| C. | 10-15 ppm |
| D. | 20-30 ppm |
| Answer» B. 5-10 ppm | |
| 66. |
Which of the following is not a result of the excess of impurity in boiler-feed? |
| A. | Scale and sludge formation |
| B. | Decomposition |
| C. | Corrosion, priming and foaming |
| D. | Caustic embrittlement |
| Answer» C. Corrosion, priming and foaming | |
| 67. |
Which of the following gases are produced in large amounts during sludge digestion? |
| A. | methane |
| B. | carbon-dioxide |
| C. | hydrogen |
| D. | nitrogen |
| Answer» B. carbon-dioxide | |
| 68. |
When the aeration system shuts off, the basin begins to perform as a ______ |
| A. | Primary clarifier |
| B. | Secondary clarifier |
| C. | Anaerobic unit |
| D. | Aeration unit |
| Answer» C. Anaerobic unit | |
| 69. |
The presence of which of the following in sewage indicates nitrogen content before decomposition ofsewage? |
| A. | Nitrites |
| B. | Nitrates |
| C. | Free ammonia |
| D. | Albuminoid nitrogen |
| Answer» E. | |
| 70. |
What is the amount of solids released into wastewater by human beings? |
| A. | 30 gpcd |
| B. | 40 gpcd |
| C. | 60 gpcd |
| D. | 70 gpcd |
| Answer» E. | |
| 71. |
Which of these is not a grit removal equipment installed in the aerated grit chamber? |
| A. | Screw conveyers |
| B. | Tubular conveyers |
| C. | Jet pumps |
| D. | Communitors |
| Answer» E. | |
| 72. |
Which CWA program controls water pollution by regulating point sources? |
| A. | SPCC |
| B. | PCC |
| C. | NPDES |
| D. | PDA |
| Answer» D. PDA | |
| 73. |
What is the colour of ozone? |
| A. | Violet |
| B. | White |
| C. | Grey |
| D. | Colourless |
| Answer» E. | |
| 74. |
The thickness of the layers of filter sand of zeolite softener is ____________ |
| A. | 20cm |
| B. | 30cm |
| C. | 40cm |
| D. | 100cm |
| Answer» E. | |
| 75. |
The discharge of regulated chemicals into surface waters is controlled by __________ |
| A. | SARA |
| B. | CERCLA |
| C. | NPDES |
| D. | PDAC |
| Answer» D. PDAC | |
| 76. |
The disappearance of the plants and animals is due to the _________ in water.www.rejinpaul.comwww.rejinpaul.com Download updated materials from Rejinpaul Network App |
| A. | Nitrogen depletion |
| B. | Chlorine depletion |
| C. | Oxygen depletion |
| D. | Ozone depletion |
| Answer» D. Ozone depletion | |
| 77. |
The addition of substances or energy forms that directly or indirectly alter the nature of the waterbody is called? |
| A. | Water contamination |
| B. | Water pollution |
| C. | Sanitation |
| D. | Water treatment |
| Answer» C. Sanitation | |
| 78. |
What is the horizontal velocity considered for grit chamber? |
| A. | 0.25-0.4m/sec |
| B. | 0.6-0.9 m/sec |
| C. | 1-2 m/sec |
| D. | 3-4m/sec |
| Answer» B. 0.6-0.9 m/sec | |
| 79. |
Belt filter presses are used in which of the following process? |
| A. | Thickening |
| B. | Stabilization |
| C. | Dewatering |
| D. | Disposal |
| Answer» D. Disposal | |
| 80. |
What percentage of solids does wastewater contain? |
| A. | 0.5% |
| B. | 5% |
| C. | 0.1% |
| D. | 1% |
| Answer» D. 1% | |
| 81. |
The color of the artificial zeolite permutit is ____________ |
| A. | Grey |
| B. | Yellow |
| C. | Green |
| D. | White |
| Answer» E. | |
| 82. |
What is the growth of huge amounts of algae and other aquatic plants leading to the deterioration ofthe water quality called? |
| A. | Eutrophication |
| B. | Algae growth |
| C. | Nitrification |
| D. | Denitrification |
| Answer» B. Algae growth | |
| 83. |
The presence of free ammonia in sewage represents ____________ |
| A. | Air pollution |
| B. | Old pollution |
| C. | Recent pollution |
| D. | Water pollution |
| Answer» D. Water pollution | |
| 84. |
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» B. 50 degree Celsius | |
| 85. |
Stoke’s law holds good for Reynolds’s number ______ |
| A. | Less than 1 |
| B. | Equal to 1 |
| C. | Greater than 1 |
| D. | Nearer to 1 |
| Answer» B. Equal to 1 | |
| 86. |
Water is mainly used in boilers for the generation of ________________ |
| A. | Power |
| B. | Electricity |
| C. | Steam |
| D. | Current |
| Answer» D. Current | |
| 87. |
Sludge from the primary clarifier is ______ |
| A. | Brown and flocculant like appearance |
| B. | Dark in colour |
| C. | Gray and slimy |
| D. | Dark brown in colour |
| Answer» D. Dark brown in colour | |
| 88. |
If the precipitate formed is soft, loose and slimy, these are __________ and if the precipitate is hardand adhering on the inner wall, it is called _____________ |
| A. | Sludges, scale |
| B. | Scale, sludges |
| C. | Sludges, rodent |
| D. | Scale, rodent |
| Answer» B. Scale, sludges | |
| 89. |
What is the detention time considered for aerated grit chamber? |
| A. | 5-6 mins |
| B. | 2-5 mins |
| C. | 1-2 mins |
| D. | 3-4 mins |
| Answer» C. 1-2 mins | |
| 90. |
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» D. Bone charcoal | |
| 91. |
_________ is accomplished by the replenishment of oxygen lost to bacterial degradation of organicwaste. |
| A. | Gas transfer |
| B. | Dilution |
| C. | Filtration |
| D. | Re-suspension |
| Answer» B. Dilution | |
| 92. |
Natural zeolite is mainly processed from ____________ |
| A. | White sand |
| B. | Green sand |
| C. | Grey sand |
| D. | Red sand |
| Answer» C. Grey sand | |
| 93. |
How can caustic embrittlement be avoided? |
| A. | Addition of nickel |
| B. | Increasing potential |
| C. | Decreasing carbon |
| D. | Adding tannins |
| Answer» E. | |
| 94. |
The fluoride concentration for prevention of dental caries is ____________ |
| A. | 1mg/l |
| B. | 2mg/l |
| C. | 3mg/l |
| D. | 4mg/l |
| Answer» B. 2mg/l | |
| 95. |
The maximum amount of pollution that each waterway could absorb is known as _________ |
| A. | TMDL |
| B. | TSML |
| C. | TDSML |
| D. | TDS |
| Answer» B. TSML | |
| 96. |
In ion-exchange process, the capital cost is _________ and the operational expenses are______________ |
| A. | Low, high |
| B. | High, low |
| C. | High, high |
| D. | Low, low |
| Answer» D. Low, low | |
| 97. |
Which section of CWA regulates land disposal of sludge? |
| A. | Section 402 |
| B. | Section 403 |
| C. | Section 404 |
| D. | Section 405 |
| Answer» E. | |
| 98. |
The exhausted anion exchange column is regenerated by passing a solution of ____________ |
| A. | Dil. KOH |
| B. | Conc. KOH |
| C. | Conc. NaOH |
| D. | Dil. NaOH |
| Answer» E. | |
| 99. |
The decomposition of sewage takes place, causing a pungent smell. Which of the following causes thepungent smell? |
| A. | CO2 |
| B. | H2SO4 |
| C. | HCL |
| D. | H2S |
| Answer» E. | |
| 100. |
The type of solids which floats in sewage is __________ |
| A. | Suspended solids |
| B. | Settleable solids |
| C. | Dissolved solids |
| D. | Total solids |
| Answer» B. Settleable solids | |