MCQOPTIONS
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MCQOPTIONS
This section includes 2171 Mcqs, each offering curated multiple-choice questions to sharpen your Current Affairs knowledge and support exam preparation. Choose a topic below to get started.
| 1751. |
Oxidation of ammonia is |
| A. | exothermic |
| B. | endothermic |
| C. | non-catalytic |
| D. | autocatalytic |
| Answer» B. endothermic | |
| 1752. |
A fertiliser contains 82% N₂. It could be |
| A. | urea |
| B. | liquid NH₃ |
| C. | ammonium nitrate |
| D. | none of these |
| Answer» C. ammonium nitrate | |
| 1753. |
Prilling of urea should be accomplished (in a sprayer) just above the melting point of urea with minimum of retention time, otherwise it will result in |
| A. | low bulk density product |
| B. | biuret formation |
| C. | non-spherical prills |
| D. | substantially wet non-flowing and sticky product |
| Answer» C. non-spherical prills | |
| 1754. |
A phosphatic fertiliser contains 16% P₂O₅. It could be |
| A. | dicalcium phosphate |
| B. | superphosphate |
| C. | triple superphosphate |
| D. | none of these |
| Answer» C. triple superphosphate | |
| 1755. |
Fertiliser value of a nitrogeneous fertiliser is expressed in terms of its __________ content. |
| A. | N₂ |
| B. | KNO₃ |
| C. | NO₂ |
| D. | NHO₃ |
| Answer» B. KNO₃ | |
| 1756. |
Raw materials required for the production of CAN (Calcium ammonium nitrate) is NH₃ |
| A. | HNO₃ & limestone |
| B. | CO₂ & H₂SO₄ |
| C. | HNO₃ & NH₄Cl |
| D. | CO₂ & KNO₃ |
| Answer» B. CO₂ & H₂SO₄ | |
| 1757. |
Conversion of yellow phosphorus to red phosphorous is done in retorts at 250-450°C in the |
| A. | presence of an inert atmosphere. |
| B. | presence of a reducing atmosphere. |
| C. | absence of air. |
| D. | presence of an oxidising atmosphere. |
| Answer» D. presence of an oxidising atmosphere. | |
| 1758. |
Reaction of nitric acid and sulphuric acid with phosphate rock produces |
| A. | nitrophosphate |
| B. | diammonium phosphate |
| C. | tricresyl phosphate |
| D. | tributyl phosphate |
| Answer» B. diammonium phosphate | |
| 1759. |
Out of the following, N₂ content is minimum in |
| A. | urea |
| B. | ammonium nitrate |
| C. | ammonium sulphate |
| D. | ammonium chloride |
| Answer» D. ammonium chloride | |
| 1760. |
Which of the following is the costliest method for commercial production of hydrogen for ammonia synthesis ? |
| A. | H₂ separation from coke oven gas |
| B. | Steam reforming of naphtha |
| C. | Cracking of natural gas |
| D. | Electrolysis of water |
| Answer» E. | |
| 1761. |
In the manufacture of orthophosphoric acid by strong H₂SO₄ leaching wet process, keeping the reactor temperature above 100°C, results in the formation of undesriable |
| A. | CaSO₄ .1/2H₂O and CaSO₄ crystals |
| B. | pyrophosphoric acid |
| C. | metaphosphoric acid |
| D. | all (a), (b) and (c). |
| Answer» B. pyrophosphoric acid | |
| 1762. |
Tricresyl phosphate is chemically represented as |
| A. | (CH₃C₆H₄)₃PO₄ |
| B. | Ca₁₀(PO₄)₃F₆ |
| C. | (NH₄)₂HPO₄ |
| D. | NH₄H₂PO₄ |
| Answer» B. Ca₁₀(PO₄)₃F₆ | |
| 1763. |
Phosphatic fertilisers |
| A. | are useful during early stage of the plant growth. |
| B. | accelerate fruit formation in later stages of growth. |
| C. | lessen the effect of excessive nitrogen application. |
| D. | none of these |
| Answer» C. lessen the effect of excessive nitrogen application. | |
| 1764. |
Optimum reaction temperature in steam reforming of naphtha is __________ °C. |
| A. | 700 - 1000 |
| B. | 300 - 450 |
| C. | 1500-1700 |
| D. | 100-200 |
| Answer» B. 300 - 450 | |
| 1765. |
CaH₄(PO₄)₂ is the chemical formula of |
| A. | superphosphate |
| B. | triple superphosphate |
| C. | calcium phosphate |
| D. | meta phosphoric acid |
| Answer» C. calcium phosphate | |
| 1766. |
Heating a mixture of phosphate rock, coke and sand in an electric furnace produces |
| A. | phosphoric acid |
| B. | ammonium phosphate |
| C. | phosphorous |
| D. | superphosphate |
| Answer» D. superphosphate | |
| 1767. |
Nitro-phosphate (manufactured at Trom-bay) is a __________ fertiliser. |
| A. | mixed |
| B. | complex |
| C. | highly hygroscopic |
| D. | highly explosive |
| Answer» C. highly hygroscopic | |
| 1768. |
Maximum stability of white phosphorous is at |
| A. | very high pressure |
| B. | atmospheric pressure |
| C. | room temperature |
| D. | >600°C |
| Answer» E. | |
| 1769. |
Chemical formula of metaphosphoric acid is |
| A. | H₃PO₄ |
| B. | H₄P₂O₇ |
| C. | HPO₃ |
| D. | same as that of pyrophosphoric acid |
| Answer» D. same as that of pyrophosphoric acid | |
| 1770. |
Which fertiliser is made (using coke oven gas) in by products plant of an integrated steel plant ? |
| A. | Urea |
| B. | CAN |
| C. | Ammonium sulphate |
| D. | Superphosphate |
| Answer» D. Superphosphate | |
| 1771. |
Nitrogen content of urea is about __________ percent. |
| A. | 10 |
| B. | 46 |
| C. | 80 |
| D. | 94 |
| Answer» C. 80 | |
| 1772. |
The main constituent of rock phosphate is |
| A. | mono-calcium phosphate |
| B. | di-calcium phosphate |
| C. | fluorspar |
| D. | none of these |
| Answer» C. fluorspar | |
| 1773. |
HPO₃ is the chemical formula of __________ phosphoric acid. |
| A. | pyro |
| B. | ortho |
| C. | meta |
| D. | none of these |
| Answer» D. none of these | |
| 1774. |
NPK fertiliser is a __________ fertiliser. |
| A. | complex |
| B. | mixed |
| C. | nitrogenous |
| D. | phosphatic |
| Answer» C. nitrogenous | |
| 1775. |
Maximum nitrogen percentage is in |
| A. | ammonium sulphate. |
| B. | calcium ammonium nitrate. |
| C. | urea. |
| D. | liquid ammonia. |
| Answer» E. | |
| 1776. |
Which of the following is the costliest source of hydrogen needed for ammonia manufacture under Indian condition ? |
| A. | Electrolysis of water. |
| B. | Cryogenic removal of H₂ from coke oven gas. |
| C. | Steam reforming of naphtha. |
| D. | Natural gas cracking. |
| Answer» B. Cryogenic removal of H₂ from coke oven gas. | |
| 1777. |
Phosphatic fertiliser is graded based on its __________ content. |
| A. | P₂O₃ |
| B. | PCl₅ |
| C. | P₂O₅ |
| D. | H₃PO₄ |
| Answer» D. H₃PO₄ | |
| 1778. |
Monte catini process is a widely used process for the manufacture of |
| A. | urea |
| B. | calcium ammonium nitrate |
| C. | triple superposphate |
| D. | none of these |
| Answer» B. calcium ammonium nitrate | |
| 1779. |
Reaction of orthophosphoric acid with phosphate rock produces |
| A. | superphosphate |
| B. | triple superphosphate |
| C. | metaphosphoric acid |
| D. | monoammonium phosphate |
| Answer» C. metaphosphoric acid | |
| 1780. |
Potassic fertilisers |
| A. | are useful during early stage of the plant growth. |
| B. | stimulate early growth and accelerate seeding. |
| C. | help in development of starches of potatoes and grain. |
| D. | none of these. |
| Answer» D. none of these. | |
| 1781. |
Which of the following gasifiers can be attached to coal based fertiliser plants ? |
| A. | Lurgi (high pressure) gasifier. |
| B. | Kopper-Totzek gasifier. |
| C. | Gasifier working at 20 atm. |
| D. | Gasifier working at 40 atm. |
| Answer» C. Gasifier working at 20 atm. | |
| 1782. |
Hydrogen is recovered from coke oven gas on commercial scale (as practised in fertiliser plant at Rourkela) by |
| A. | adsorption on palladium. |
| B. | cryogenic operations (low temperature cooling). |
| C. | absorption (using ethanolamine or pyragalloll solution). |
| D. | none of these. |
| Answer» C. absorption (using ethanolamine or pyragalloll solution). | |
| 1783. |
The grade of concrete not recommended by I.S. : 456, is |
| A. | M 100 |
| B. | M 200 |
| C. | M 300 |
| D. | M 500 |
| Answer» E. | |
| 1784. |
Joints in concrete structures, are provided |
| A. | to reduce the tensile stresses likely to be developed due to evaporation of water |
| B. | to minimise the change in the dimensions of the slab |
| C. | to minimise the necessary cracking |
| D. | all the above. |
| Answer» E. | |
| 1785. |
Sand generally contains salt if it is obtained from: |
| A. | nala beds |
| B. | river beds |
| C. | sea beds |
| D. | all the above |
| Answer» D. all the above | |
| 1786. |
Bulking of sand is |
| A. | mixing of different sizes of sand particles |
| B. | mixing of lime with sand |
| C. | maximum water with sand |
| D. | swelling of sand when wetted. |
| Answer» E. | |
| 1787. |
Horizontal construction joints in concrete walls are generally provided at |
| A. | soffit level |
| B. | window sill level |
| C. | floor level |
| D. | all the above. |
| Answer» E. | |
| 1788. |
If P, Y and Z are the weights of cement, fine aggregates and coarse aggregates respetively and W/C is the water cement ratio, the minimum quantity of water to be added to first batch, is obtained by the equation |
| A. | 0.1P + 0.3Y + 0.1Z = W/C x P |
| B. | 0.3P + 0.1Y + 0.01Z = W/C x P |
| C. | 0.4P + 0.2Y + 0.01Z = W/C x P |
| D. | 0.5P + 0.3Y + 0.01Z = W/C x P |
| Answer» C. 0.4P + 0.2Y + 0.01Z = W/C x P | |
| 1789. |
If the depth of moist sand in a cylinder is 15 cm and the depth of the sand when fully inundated with water is 12 cm, the bulking of the moist sand, is |
| A. | 10% |
| B. | 12% |
| C. | 15% |
| D. | 25%. |
| Answer» E. | |
| 1790. |
A flaky aggregate is said to be elongated if its length is |
| A. | equal to the mean size |
| B. | twice the mean size |
| C. | thrice the mean size |
| D. | four times the mean size |
| Answer» C. thrice the mean size | |
| 1791. |
For given workability the grading requiring the least amount of water is one that gives |
| A. | greatest surface area for the given cement and aggregates |
| B. | least surface area for the given cement and aggregates |
| C. | least weight for the given cement and aggregates |
| D. | greatest weight for the given cement and aggregates |
| Answer» B. least surface area for the given cement and aggregates | |
| 1792. |
To hydrate 500kg of cement full water needed, is |
| A. | 100 kg |
| B. | 110 kg |
| C. | 120 kg |
| D. | 130 kg |
| Answer» E. | |
| 1793. |
Inert material of a cement concrete mix, is |
| A. | water |
| B. | cement |
| C. | aggregate |
| D. | none of these. |
| Answer» D. none of these. | |
| 1794. |
The ratio of various ingredients (cement, sand, aggregates) in concrete of grade M 200, is |
| A. | 1 : 2 : 4 |
| B. | 1 : 3 : 6 |
| C. | 1 : 1.5 : 3 |
| D. | 1 : 1 : 2 |
| Answer» D. 1 : 1 : 2 | |
| 1795. |
Non-uniform compaction may cause the concrete |
| A. | porous |
| B. | non-homogeneous |
| C. | reduced strength |
| D. | all the above. |
| Answer» E. | |
| 1796. |
Pozzolanic properties exist in |
| A. | shales |
| B. | fly ash |
| C. | pumicite |
| D. | all the above. |
| Answer» E. | |
| 1797. |
In the method of voids for determination of the quantity of cement paste, it is assumed that |
| A. | Voids in coarse aggregates are filled by fine aggregates |
| B. | Voids in fine aggregates are filled by the cement paste |
| C. | Volume of fine aggregates is equal to total voids in coarse aggregates plus 10% extra |
| D. | All the above. |
| Answer» E. | |
| 1798. |
M10 grade of concrete approximates |
| A. | 1 : 3 : 6 mix |
| B. | 1 : 1 : 2 mix |
| C. | 1 : 2 : 4 mix |
| D. | 1 : 1.5 : 3 mix |
| Answer» B. 1 : 1 : 2 mix | |
| 1799. |
If the average compressive strength is 4000 kg/cm² and standard deviation is 500, the co-efficient of variation is |
| A. | 10% |
| B. | 12.5% |
| C. | 15% |
| D. | 18.5 % |
| Answer» C. 15% | |
| 1800. |
For road pavements, the cement generally used, is |
| A. | ordinary Portland cement |
| B. | rapid hardening cement |
| C. | low heat cement |
| D. | blast furnace slag cement |
| Answer» C. low heat cement | |