MCQOPTIONS
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MCQOPTIONS
This section includes 157 Mcqs, each offering curated multiple-choice questions to sharpen your Concrete Technology knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
What is the permissible limits for construction of suspended matter in water? |
| A. | 200mg/l |
| B. | 2000mg/l |
| C. | 3000mg/l |
| D. | 500mg/l |
| Answer» C. 3000mg/l | |
| 2. |
What is the permissible limits for construction of inorganic matter in water? |
| A. | 200mg/l |
| B. | 2000mg/l |
| C. | 3000mg/l |
| D. | 500mg/l |
| Answer» D. 500mg/l | |
| 3. |
The mineral oil if present in mixing for concrete __________ |
| A. | Improves strength |
| B. | Reduces strength |
| C. | Gives more slump |
| D. | Gives a smooth surface |
| Answer» B. Reduces strength | |
| 4. |
The vegetable oil if present in mixing for concrete __________ |
| A. | Improves strength |
| B. | Reduces strength |
| C. | Gives more slump |
| D. | Gives a smooth surface |
| Answer» C. Gives more slump | |
| 5. |
Which of the following statement is incorrect for mixing water? |
| A. | Suspended particles of clay and slit < .02% |
| B. | The quality of CaCl2 is restricted to 1.5% |
| C. | The pH value of water should be between 6-8 |
| D. | Free vegetable oil is beneficial |
| Answer» E. | |
| 6. |
________is the apparatus in which turbidity is measured as a function of intensity of light scattered as it passes through the water sample. |
| A. | Barometer |
| B. | Tintometer |
| C. | Colorimeter |
| D. | Nephelometer |
| Answer» E. | |
| 7. |
Calculate number of moles of oxygen required for reacting with one mole of ammonium ions to convert to nitrate ions? |
| A. | 2 |
| B. | 2.5 |
| C. | 3 |
| D. | 1 |
| Answer» B. 2.5 | |
| 8. |
Excessive nitrate in drinking water causes |
| A. | Colour blindness |
| B. | Fluorosis |
| C. | Methemoglobinemia |
| D. | Rickets |
| Answer» D. Rickets | |
| 9. |
A water treatment plant treats 6000 m3 of water per day. If it consumes 20 kg chlorine per day, then the chlorine dosage would be: |
| A. | 3.00 mg/l |
| B. | 3.75 mg/l |
| C. | 4.25 mg/l |
| D. | 3.33 mg/l |
| Answer» E. | |
| 10. |
On standard silica scale, the turbidity in drinking water should be limited to: |
| A. | 10 ppm |
| B. | 50 ppm |
| C. | 30 ppm |
| D. | 20 ppm |
| Answer» B. 50 ppm | |
| 11. |
Production of incrustation and sediment deposits are found in: |
| A. | Acidic water |
| B. | Alkaline water |
| C. | Acidic and alkaline water both |
| D. | Neither acidic nor alkaline water |
| Answer» C. Acidic and alkaline water both | |
| 12. |
pH of sea water varies from__________. |
| A. | 6.5 to 7.5 |
| B. | 8.2 to 9.3 |
| C. | 6.2 to 7.1 |
| D. | 7.5 to 8.4 |
| Answer» E. | |
| 13. |
Per capita water demand is |
| A. | Average amount of daily water required by one person |
| B. | Monthly average amount of daily water required by one person |
| C. | Annual average amount of daily water required by one person |
| D. | Weekly average amount of daily water required by one person |
| Answer» D. Weekly average amount of daily water required by one person | |
| 14. |
Air binding in rapid sand filter occurs due to |
| A. | Cracking of filter sand |
| B. | Low temperature |
| C. | Mud ball formation |
| D. | Excessive negative head |
| Answer» E. | |
| 15. |
Dissolved oxygen is measured by titrating the water sample with |
| A. | N/35.5 AgNO3 |
| B. | N/40 Na2S2O3 |
| C. | H2SO4 |
| D. | N/50 EDTA |
| Answer» C. H2SO4 | |
| 16. |
As per IS 10500-2012, which of the following Pollutant(s) have some relaxation in their Acceptable Limits in the absence of alternate sources of water?(i) Aluminium (as Al)(ii) Ammonia (as total ammonia-N)(iii) Barium (as Ba)(iv) Boron (as B) |
| A. | Only (i) |
| B. | (i) and (iv) |
| C. | (iii) and (iv) |
| D. | (i) and (ii) |
| Answer» C. (iii) and (iv) | |
| 17. |
Match List-I (parameters) and List-II (diseases) and select the correct answer using the codes given below the lists:List I(a) Absence of fluorides(b) Excess of lead(c) Presence of excess nitrate(d) Absence of iodide List II (i) Methemoglobinemia (ii) Goitre (iii) Dental caries(iv) Anaemia |
| A. | (a)-(iii), (b)-(iv), (c)-(i), (d)-(ii) |
| B. | (a)-(ii), (b)-(iii), (c)-(i), (d)-(iv) |
| C. | (a)-(iii), (b)-(ii), (c)-(i), (d)-(iv) |
| D. | (a)-(iii), (b)-(iv), (c)-(ii), (d)-(i) |
| Answer» B. (a)-(ii), (b)-(iii), (c)-(i), (d)-(iv) | |
| 18. |
Match List – I with List – II and select the correct answer using the code given below the Lists: List I(Impurity in drinking water) List II(Harm caused)(A)Excess of nitrates(1)Brackish water(B)Excess of fluorides(2)Goiter(C)Lack of iodides(3)Fragile bones(D)Excess of chlorides(4)Blue babies |
| A. | A – 4, B – 2, C – 3, D – 1 |
| B. | A – 1, B – 2, C – 3, D – 4 |
| C. | A – 4, B – 3, C – 2, D – 1 |
| D. | A – 1, B – 3, C – 2, D – 4 |
| Answer» D. A – 1, B – 3, C – 2, D – 4 | |
| 19. |
A 25 ml sample was diluted to 250 ml with odourless distilled water so that the odour of the sample no longer perceivable. What was the Threshold odour number ? |
| A. | 11 |
| B. | 10 |
| C. | 25 |
| D. | 05 |
| Answer» C. 25 | |
| 20. |
In water supply for public, threshold odour should be |
| A. | 1 |
| B. | between 1 and 3 |
| C. | 3 |
| D. | more than 3 |
| Answer» C. 3 | |
| 21. |
Lead Poisoning occurs when the lead content in water exceeds ______. |
| A. | 0.5 ppm |
| B. | 0.05 ppm |
| C. | 0.15 ppm |
| D. | 0.1 ppm |
| Answer» C. 0.15 ppm | |
| 22. |
Non-disposal of solid waste may cause |
| A. | Malaria |
| B. | Typhoid |
| C. | Plague |
| D. | Dysentery |
| Answer» C. Plague | |
| 23. |
B-coli or E-coli are harmless organism but their presence in water indicates |
| 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 | |
| 24. |
Column I lists various impurities in drinking water and Column II lists effects/ diseases caused by these impurities.Column IColumn IIP. Nitrate > 45 ppm1. Minamata diseaseQ. Mercury > 0.001 ppm2. Discoloration of teethR. Fluoride < 1.0 ppm3. Cavities in teethS. Fluoride > 1.5 ppm4. Methemoglobenemia 5. PneumoconiosisThe correct match of the column I with column II is |
| A. | P - 4, Q - 5, R - 2, S - 3 |
| B. | P - 4, Q - 1, R - 3, S - 2 |
| C. | P - 4, Q - 1, R - 2, S - 3 |
| D. | P - 5, Q - 4, R - 1, S - 2 |
| Answer» C. P - 4, Q - 1, R - 2, S - 3 | |
| 25. |
Acidity in natural water in surface water bodies is mainly due to |
| A. | Oxygen |
| B. | BOD |
| C. | Carbon dioxide |
| D. | Sulfuric and nitric acids |
| Answer» D. Sulfuric and nitric acids | |
| 26. |
As per IS 10500: 1991, what is the permissible limit in the absence of alternative sources for the total hardness of drinking water? |
| A. | 600 mg/I |
| B. | 300 mg/I |
| C. | 800 mg/I |
| D. | 500 mg/I |
| Answer» B. 300 mg/I | |
| 27. |
A water borne disease may be controlled by |
| A. | disinfection of water |
| B. | sterilization of water |
| C. | demineralization of water |
| D. | desalination of water |
| Answer» B. sterilization of water | |
| 28. |
Match List-I (parameters) with List-II (Permissible concentrations in drinking water) and select the correct answer using the codes given below the lists:List I(a) Hardness(b) Chlorides(c) Iron (d) FluorideList II(i) 1 mg/l (ii) 200 mg/l (iii) 250 mg/liv) 0.1 mg/l |
| A. | (a)-(ii), (b)-(iii), (c)-(i), (d)-(iv) |
| B. | (a)-(ii), (b)-(iii), (c)-(iv), (d)-(i) |
| C. | (a)-(iii), (b)-(ii), (c)-(i), (d)-(iv) |
| D. | (a)-(iii), (b)-(ii), (c)-(iv), (d)-(i) |
| Answer» C. (a)-(iii), (b)-(ii), (c)-(i), (d)-(iv) | |
| 29. |
In water treatment, the manual screens are kept inclined at an angle of |
| A. | 30 - 50° with the horizontal |
| B. | 45 - 60° with the horizontal |
| C. | 50 - 70° with the horizontal |
| D. | 45 - 80° with the horizontal |
| Answer» C. 50 - 70° with the horizontal | |
| 30. |
Consider the following impurities:i) CO2 and H2Sii) Finely divided suspended matteriii) Disease-causing bacteriaiv) Excess alkalinityThe correct sequence of the removal of these impurities in a water treatment plant is – |
| A. | i) ii) iii) iv) |
| B. | i) iv) iii) ii) |
| C. | i) iv) ii) iii) |
| D. | iv) i) iii) ii) |
| Answer» D. iv) i) iii) ii) | |
| 31. |
As per l.S.10500, the acceptable limit for chlorides in mg/l in drinking water is |
| A. | 100 mg/l |
| B. | 500 mg/l |
| C. | 250 mg/l |
| D. | 1500 mg/l |
| Answer» D. 1500 mg/l | |
| 32. |
As per the Indian Standard specification for drinking water (IS 10500 : 2012), what is the maximum acceptable limit of Fluoride (as F), in mg/l |
| A. | 0.03 |
| B. | 0.7 |
| C. | 1 |
| D. | 30 |
| Answer» D. 30 | |
| 33. |
EDTA titration method of hardness determination of water sample uses an indicator which combines with hardness causing divalent cations and forms a coloured complex. The name of the indicator and the colour of the formed complex respectively are |
| A. | Ferroin and Dark blue |
| B. | Ferroin and Wine red |
| C. | Erichrome Black T and Dark blue |
| D. | Erichrome Black T and Wine red |
| Answer» E. | |
| 34. |
If methyl orange alkalinity of water equals or exceeds total hardness, all of the hardness is: |
| A. | Non-carbonate hardness |
| B. | Carbonate hardness |
| C. | Pseudo hardness |
| D. | Negative non-carbonate hardness |
| Answer» C. Pseudo hardness | |
| 35. |
Calculate pOH of a buffer solution containing 0.02M acetic acid and 0.02M sodium acetate? (given pKa = 4.74) |
| A. | 9.0 |
| B. | 6.0 |
| C. | 9.26 |
| D. | 4.0 |
| Answer» D. 4.0 | |
| 36. |
pH of water solution having concentration of [OH--] ions of 0.008 is ______. |
| A. | 5.4 |
| B. | 7.1 |
| C. | 9.0 |
| D. | 11.9 |
| Answer» E. | |
| 37. |
According to IS 10500-2012, what is the desirable limit for residual chlorine in mg/L is? |
| A. | 0.3 |
| B. | 0.4 |
| C. | 0.1 |
| D. | 0.2 |
| Answer» D. 0.2 | |
| 38. |
For drainage pipes in buildings, the test applied before putting them to use is |
| A. | smoke test |
| B. | water test |
| C. | straightness test |
| D. | All of the above |
| Answer» B. water test | |
| 39. |
A test used to measure the strength of waste water is called ______. |
| A. | pH |
| B. | BOD |
| C. | Surface setting rate |
| D. | Detention period |
| Answer» C. Surface setting rate | |
| 40. |
Eutrophication of lakes is caused by the discharge of water containing excessive quantities of |
| A. | Discharge of heavy metals |
| B. | Phosphorus |
| C. | Potassium |
| D. | Carbonaceous matter |
| Answer» C. Potassium | |
| 41. |
Blue baby disease found in infants is due to excessive ________ in drinking water. |
| A. | Colour |
| B. | Sulphates |
| C. | Carbonates |
| D. | Nitrates |
| Answer» E. | |
| 42. |
An activated carbon is specially treated carbon which has the property of absorbing and attracting impurities. Which of the following points is / are not among the advantages of activated carbon?A. It minimizes the chlorine demand of treated waterB. It accelerates the coagulationC. Its overdose is harmful |
| A. | Only B |
| B. | A and C |
| C. | Only C |
| D. | Only A |
| Answer» D. Only A | |
| 43. |
One degree of hardness is equivalent to _____. |
| A. | 1425 mg/litre |
| B. | 14.25 mg/litre |
| C. | 142.5 mg/litre |
| D. | 1.425 mg/litre |
| Answer» C. 142.5 mg/litre | |
| 44. |
In surface water, the color produced by colloidal suspension is termed as |
| A. | Apparent color |
| B. | True color |
| C. | Light color |
| D. | Dark color |
| Answer» C. Light color | |
| 45. |
Lake water contains phosphate ions. Which specie would be formed if ferric ions in form of ferric chloride are added in lake water? |
| A. | Sodium chloride |
| B. | Ferric chloride |
| C. | Ferric phosphate |
| D. | Ferrous hydroxide |
| Answer» D. Ferrous hydroxide | |
| 46. |
As per IS 10500-1991, maximum lead content allowed in drinking water is _____ mg/l. |
| A. | 0.05 |
| B. | 0.15 |
| C. | 0.015 |
| D. | 0.005 |
| Answer» B. 0.15 | |
| 47. |
Artificial lake use to store water for human use is known as |
| A. | Lake |
| B. | Ocean |
| C. | Sea |
| D. | Reservoir |
| Answer» E. | |
| 48. |
The rocks through which water can pass is referred as |
| A. | Water Table |
| B. | Permeable Rock |
| C. | Impermeable Rock |
| D. | Semi Permeable Rocks |
| Answer» C. Impermeable Rock | |
| 49. |
Further cooling of clouds leads to |
| A. | Transpiration |
| B. | condensation |
| C. | Vapor-transpiration |
| D. | Precipitation |
| Answer» E. | |
| 50. |
Which state of USA is supplied by a network of water pipelines? |
| A. | Atlanta |
| B. | Alaska |
| C. | California |
| D. | Network |
| Answer» D. Network | |