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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.
| 151. |
The gas used in refrigerating appliance causing serious damage to ozone is |
| A. | MFCs |
| B. | CFCs |
| C. | LPCs |
| D. | DPCs |
| Answer» C. LPCs | |
| 152. |
Acid rain mainly contains |
| A. | Sodium chloride |
| B. | Sulphur di oxide and Nitrogen di oxide |
| C. | Hydrochloric acid |
| D. | Carbon tetra chloride |
| Answer» C. Hydrochloric acid | |
| 153. |
_____ is a commonly used chemical method for purifying water. |
| A. | Brominization |
| B. | Flourination |
| C. | Filtration |
| D. | Chlorination |
| Answer» E. | |
| 154. |
For basic requirements of water supply, drainage and sanitation, as per the IS code, what is the domestic water demand in Indian cities and towns? |
| A. | 135 litres per head/day |
| B. | 200 litres per head/day |
| C. | 240 litres per head/day |
| D. | 340 litres per head/day |
| Answer» B. 200 litres per head/day | |
| 155. |
If the average daily consumption of water of a city is 1 × 105 m3. Then the maximum daily consumption of water will be |
| A. | 1 × 105 m3 |
| B. | 1.5 × 105 m3 |
| C. | 1.8 × 105 m3 |
| D. | 2.7 × 105 m3 |
| Answer» D. 2.7 × 105 m3 | |
| 156. |
Choose the correct statement.a) Distribution reservoir absorbs the hourly variations in demand.b) They help in maintaining constant pressure in the distribution mains |
| A. | Statement (a) alone is true |
| B. | Statement (b) alone is true |
| C. | Both the statements (a) and (b) are true |
| D. | Both the statements (a) and (b) are false |
| E. | Information insufficient |
| Answer» D. Both the statements (a) and (b) are false | |
| 157. |
Consider the following statements in respect of cast iron pipes employed for water supply:1. Easy to make joints2. Strong and durable3. Corrosion resistant4. Long lifeWhich of the above statements are correct? |
| A. | 1, 2 and 3 only |
| B. | 1, 3 and 4 only |
| C. | 2, 3 and 4 only |
| D. | 1, 2, 3 and 4 |
| Answer» E. | |
| 158. |
As per IS 10500:2012, for drinking water in the absence of an alternate source of water, the permissible limits for chloride and sulphate, in mg/L, respectively are |
| A. | 250 and 200 |
| B. | 1000 and 400 |
| C. | 200 and 250 |
| D. | 500 and 1000 |
| Answer» C. 200 and 250 | |
| 159. |
A water supply distribution system for an averagely-populate township is to be designed for |
| A. | Maximum daily demand |
| B. | Maximum hourly demand and fire demand |
| C. | Average demand |
| D. | Maximum daily demand and fire demand, or maximum hourly demand, whichever is higher. |
| Answer» E. | |
| 160. |
A “Gate Valve” also known as a _____. |
| A. | Sluice valve |
| B. | Reflux valve |
| C. | Ball valve |
| D. | Float valve |
| Answer» B. Reflux valve | |
| 161. |
Consider the following statements with reference to the mixing of industrial waste water with domestic waste water:1. The industrial waste water can be mixed with domestic water when it has higher BOD.2. The industrial waste water can be mixed with domestic water when the pH value of industrial waste water is highly alkaline.Which of the above statements is/are correct? |
| A. | 1 only |
| B. | 2 only |
| C. | Both 1 and 2 |
| D. | Neither 1 nor 2 |
| Answer» E. | |
| 162. |
Match items in List-I with items in List-II and select the correct answer from the codes given belowList - IList – IIA. GagrinI. KotaB. PipladII. BundiC. GardadaIII. JhalawarD. TakliIV. BaranCodes: |
| A. | A - I, B - II, C - III, D - IV |
| B. | A - IV, B - III, C - II, D - I |
| C. | A - III, B - III, C - II, D - I |
| D. | A - I, B - IV, C - II, D - III |
| Answer» C. A - III, B - III, C - II, D - I | |
| 163. |
In water supply pipes, wrought iron and cast iron pipes have relationship as |
| A. | Life of wrought iron pipes > life of cast iron pipes |
| B. | Life of cast iron pipes > life of wrought iron pipes |
| C. | Both life spans are equal |
| D. | Life of wrought iron pipes = 2 (life of cast iron pipes) |
| Answer» C. Both life spans are equal | |
| 164. |
Calculate the population by the end of 2011 by the arithmetical increase method.YearPopulation19511,00,00019611,09,00019711,16,00019811,28,000 |
| A. | 1,36,000 |
| B. | 1,56,000 |
| C. | 1,46,000 |
| D. | 1,26,000 |
| Answer» C. 1,46,000 | |
| 165. |
For water supply to a medium town, what is the daily variation factor? |
| A. | 2.5 |
| B. | 1.5 |
| C. | 3 |
| D. | 3.5 |
| Answer» C. 3 | |
| 166. |
If the average sewage from a city is 95 × 106 l/day and the average five-day BOD is 300 mg/l, the population equivalent of the city is: (assume 5 day BOD percapita at 20°C = 0.075 kg/day) |
| A. | 2,10,000 |
| B. | 3,80,000 |
| C. | 5,10,000 |
| D. | 6,25,000 |
| Answer» C. 5,10,000 | |
| 167. |
Name the irrigation project launched by the Prime Minister in June 2018 in Rajgarh district of Madhya Pradesh. |
| A. | Bargi Diversion Major Irrigation Project |
| B. | Rehti Medium Irrigation Project |
| C. | Mohanpura Major Irrigation Project |
| D. | Punasa Lift Irrigation Project |
| Answer» D. Punasa Lift Irrigation Project | |
| 168. |
Consider the following statements in respect of ground water aquifers:1. Specific storage is specific capacity per unit depth of the aquifer.2. Specific capacity is storage coefficient per unit aquifer depth.3. Specific capacity is a constant for a given well.4. For one-dimensional flow in a confined aquifer between two water bodies, the piezometric head line in the aquifer is a straight line.Which of the above statements are correct? |
| A. | 2 and 3 only |
| B. | 2 and 4 only |
| C. | 1 and 3 only |
| D. | 1 and 4 only |
| Answer» C. 1 and 3 only | |
| 169. |
Consider the following statements regarding groundwater pollutants :1. Most of the groundwater are generally non-alkaline2. A moderate amount of fluoride about 0.6 mg/I to 1.5 mg/l in drinking water, would help in good development of tech3. Natural waters do not have dissolved mineral matter in themWhich of the above statements is/are correct? |
| A. | 1 only |
| B. | 2 only |
| C. | 3 only |
| D. | 1, 2 and 3 |
| Answer» C. 3 only | |
| 170. |
In which one of the following industries, the water requirement in kilo litres per unit of production is very high? |
| A. | Paper industry |
| B. | Steel industry |
| C. | Sugar industry |
| D. | Fertilizer industry |
| Answer» B. Steel industry | |
| 171. |
As per IS 10500 : 2012, for drinking water in the absence of alternate source of water, the permissible limits for chloride and sulphate, in mg/L, respectively are |
| A. | 250 and 200 |
| B. | 1000 and 400 |
| C. | 200 and 250 |
| D. | 500 and 1000 |
| Answer» C. 200 and 250 | |
| 172. |
How much bleaching powder is needed to chlorinate 5000 l of water whose chlorine demand is 2 mg/l, assuming that the bleaching powder has 25% available chlorine? |
| A. | 4 g |
| B. | 40 g |
| C. | 140 g |
| D. | 400 g |
| Answer» C. 140 g | |
| 173. |
An amount of 35.67 mg HCL is added to distilled water and the total solution volume is made to one litre. The atomic weights of H and CI are I and 35.5, respectively. Neglecting the dissociation of water, the pH of the solution, is |
| A. | 3.5 |
| B. | 3.01 |
| C. | 2.5 |
| D. | 2.01 |
| Answer» C. 2.5 | |
| 174. |
As per Indian standards the water consumption per capita per day for domestic purpose is |
| A. | 85 Liters |
| B. | 135 Liters |
| C. | 175 Liters |
| D. | 273 Liters |
| Answer» C. 175 Liters | |
| 175. |
In a flow-mass curve study, the demand line drawn from a ridge in the curve did not intersect the mass curve again. This represents that: |
| A. | the reservoir was not full at the beginning. |
| B. | the storage was not adequate |
| C. | the demand cannot be met by the inflow as the reservoir will not refill |
| D. | the reservoir is wasting water by spill |
| Answer» D. the reservoir is wasting water by spill | |
| 176. |
In which of the following systems of water distribution, water can reach a particular point only through one route and any damage or repairs at a point in the pipe line will completely stop the water supply in the area being fed by that pipe beyond the point of damage or repairs? |
| A. | Dead-end system |
| B. | Radial system |
| C. | Ring system |
| D. | Grid iron system |
| Answer» B. Radial system | |
| 177. |
A city has a population of 36000 and water is supplied at 240 I/ per head per day. The peak hourly demand of water in cum/s will be |
| A. | 0.01 |
| B. | 0.1 |
| C. | 0.27 |
| D. | 0.027 |
| E. | 100 |
| Answer» D. 0.027 | |
| 178. |
Assertion A: The consumption of water increases with increase in the distribution pressure.Reason R: Higher distribution pressure causes more loss and waste of water.Which of the following is correct? |
| A. | Both A and R are true, but R is not a correct explanation of A. |
| B. | A is true but R is false. |
| C. | A is false but R is true. |
| D. | Both A and R are true, and R is the correct explanation of A. |
| Answer» E. | |
| 179. |
As per IS 1536, what is the working pressure of a class A pipe of increasing thickness for the same diameter? |
| A. | 2,000 kN/m2 |
| B. | 1,800 kN/m2 |
| C. | 1,000 kN/m2 |
| D. | 2,400 kN/m2 |
| E. | 5,000 kN/m2 |
| Answer» B. 1,800 kN/m2 | |
| 180. |
If Q is the total quantity of water required by a town per year in litres, and P is the population of the town, then the per capita demand of water will be: |
| A. | \(\dfrac{2Q}{P\times 270}\) |
| B. | \(\dfrac{2Q}{P\times 365}\) |
| C. | \(\dfrac{Q}{P\times 365}\) |
| D. | \(\dfrac{Q}{P\times 270}\) |
| Answer» D. \(\dfrac{Q}{P\times 270}\) | |
| 181. |
If the depletion of oxygen is found to be 2 mg/l after incubating 3 ml of sewage diluted to 300 ml at 20°C for 5 days, then the BOD5 of the sewage is |
| A. | 500 mg/l |
| B. | 200 mg/l |
| C. | 550 mg/l |
| D. | 300 mg/l |
| Answer» C. 550 mg/l | |
| 182. |
If P is the population (in thousands) of a city exceeding 50000, what will be the water requirement (in Kilo litres)? |
| A. | 100P |
| B. | 100P2 |
| C. | 100√P |
| D. | 75√P |
| Answer» D. 75√P | |
| 183. |
Air valves or Air-relief valves are provided at |
| A. | Summits |
| B. | Valleys |
| C. | All joints |
| D. | None of the above |
| Answer» B. Valleys | |
| 184. |
Neeru-Meeru is a watershed management programme in the state of ______. |
| A. | Rajasthan |
| B. | Odisha |
| C. | Maharashtra |
| D. | Andhra Pradesh |
| Answer» E. | |
| 185. |
A water having pH value equal to 9 will have hydrogen ion concentration equal to |
| A. | 10-9 moles/litre |
| B. | 109 moles/litre |
| C. | 10-5 moles/litre |
| D. | 105 moles/litre |
| Answer» B. 109 moles/litre | |
| 186. |
A valve that 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 | |
| 187. |
Consider the following characteristics of E coli bacteria:1. Gram negative2. Spore- forming3. Facultative anaerobic4. BacillusWhich of the above are correct? |
| A. | 1, 2 and 3 only |
| B. | 2 and 4 only |
| C. | 1, 3 and 4 only |
| D. | 1, 2, 3 and 4 |
| Answer» D. 1, 2, 3 and 4 | |
| 188. |
According to Kuichling formula, if P is the population of a place in thousands, then the fire demand of water in liters per minute is given by: |
| A. | 6563 √p |
| B. | 4640 √p |
| C. | 3182 √p |
| D. | 5663 √p |
| Answer» D. 5663 √p | |
| 189. |
If the depletion of the oxygen is found to be 3 mg/ liter after incubating 5 ml of sewage diluted to 250 ml for 5 days at 20° C, B.O.D of the sewage is |
| A. | 150 mg/litre |
| B. | 250 mg/litre |
| C. | 350 mg/litre |
| D. | 40 mg/llitre |
| Answer» B. 250 mg/litre | |
| 190. |
Consider the following statements regarding valves in a pipe line:1. In long pipe lines, air will accumulate in the low point of the line and will interfere with the flow.2. Pressure relief valves are used in pipe lines where pressure may increase beyond the maximum permissible pressure.3. Non-return valves prevent water flowing back i.e in the opposite direction.Which of the above statements are correct? |
| A. | 1 and 2 only |
| B. | 2 and 3 only |
| C. | 1 and 3 only |
| D. | 1, 2 and 3 |
| Answer» C. 1 and 3 only | |
| 191. |
From high level water resource, the water supply system used is termed as:- |
| A. | Pumping and storage system. |
| B. | Pumping system |
| C. | Gravity system |
| D. | Dual system |
| Answer» D. Dual system | |
| 192. |
As per IS 1175-1993 in the design of a water supply scheme for a town will full flushing system minimum water supply for domestic water demand is |
| A. | 135 lpcd |
| B. | 200 lpcd |
| C. | 240 lpcd |
| D. | 27 lpcd |
| Answer» B. 200 lpcd | |
| 193. |
Consider the following statements pertaining to the sources of supply:a. Groundwater has low organic content and high dissolved oxygen.b. Lake water at the bottom has silt and bacteria.c. River water in floods has low dissolved oxygen and colour.Which of the above statements is/are correct? |
| A. | A only |
| B. | B only |
| C. | C only |
| D. | A, b and c |
| Answer» C. C only | |
| 194. |
___________ is tolerant to boron upto 4 ppm in irrigation water. |
| A. | Orange |
| B. | Cabbage |
| C. | Grape |
| D. | Wheat |
| Answer» C. Grape | |
| 195. |
Alkalinity of water, in equivalent/litre (eq/litre), is given by \(\left\{ \text{HCO}_{3}^{-} \right\}+2\left\{ CO_{3}^{2-} \right\}+\left\{ O{{H}^{-}} \right\}-\left\{ {{H}^{+}} \right\}\) where, {} represents concentration in mol/litre. For a water sample, the concentrations of \(\text{HCO}_{3}^{-}=2\times {{10}^{-3}}\) mol/litre, \(\text{CO}_{3}^{2-}=3.04\times {{10}^{-4}}\) mol/litre and the pH of water = 9.0. The atomic weights are: Ca = 40; C = 12; and O = 16. If the concentration of OH- and H+ are NEGLECTED, the alkalinity of the water sample (in mg/litre as CaCO3), is |
| A. | 130.4 |
| B. | 100 |
| C. | 50 |
| D. | 65.2 |
| Answer» B. 100 | |
| 196. |
In a water distribution network, which of the following valves will work automatically? |
| A. | Check valve |
| B. | Butterfly valve |
| C. | Scour valve |
| D. | Sluice valve |
| Answer» B. Butterfly valve | |
| 197. |
In Rajasthan, the soldering and khadin type is |
| A. | Of traditional water conservation techniques |
| B. | Of traditional war skills |
| C. | Of traditional folk dances |
| D. | Of traditional farming method |
| Answer» B. Of traditional war skills | |
| 198. |
Out of the following distribution systems, which have the least number of cut-off valves? |
| A. | Ring system |
| B. | Radial system |
| C. | Dead end system |
| D. | Grid iron system |
| Answer» D. Grid iron system | |
| 199. |
Abyssinian tube well is a special type of strainer tube well in which the diameter of the well pipe is kept equal to ___________. |
| A. | 3.8 cm |
| B. | 3.0 cm |
| C. | 4.2 cm |
| D. | 2.4 cm |
| Answer» B. 3.0 cm | |
| 200. |
A water sample is analyzed for coliform organisms by the multiple - the fermentation method. The results of the confirmed test are as follows:Sample size (mL)Number of positive results out of 5 tubesNumber of negative results out of 5 tubes0.01500.001320.000114The most probable number (MPN) of coliform organisms for the above results is to be obtained using the following MPN Index.MPN Index for Various Combinations of Positive Results when Five Tubes used per Dilution of 10.0 mL, 1.0 mL, and 0.1 mLCombination of positive tubesMPN Index per 100 mL0 – 2 – 4111 – 3 – 5194 – 2 – 0225 – 3 – 1110The MPN of coliform organisms per 100 mL is |
| A. | 110000 |
| B. | 1100000 |
| C. | 110 |
| D. | 1100 |
| Answer» B. 1100000 | |