MCQOPTIONS
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MCQOPTIONS
This section includes 8247 Mcqs, each offering curated multiple-choice questions to sharpen your Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 351. |
Fertiliser plants get their N2 requirements |
| A. | by fractionation of liquified air. |
| B. | by dissociating oxides of nitrogen. |
| C. | from coal gas (coke oven gas). |
| D. | from producer gas. |
| Answer» B. by dissociating oxides of nitrogen. | |
| 352. |
Cellulose is the main contituent of most __________ fibres. |
| A. | acrylic |
| B. | spandex |
| C. | synthetic |
| D. | natural |
| Answer» E. | |
| 353. |
__________ resins are produced by the condensation polymerisation of formaldehyde with urea or melamine. |
| A. | Epoxy |
| B. | Amino |
| C. | Alkyd |
| D. | Phenolic |
| Answer» C. Alkyd | |
| 354. |
Catalyst used in the manufacture of NH3 by Haber's process is finely divided |
| A. | nickel |
| B. | iron |
| C. | vanadium pentoxide |
| D. | alumina |
| Answer» C. vanadium pentoxide | |
| 355. |
Natural rubber is obtained from latex, which is a colloidal dispersion of rubber in water. Which of the following is used as a coagulant in latex ? |
| A. | Ammonium alum |
| B. | Potassium alum |
| C. | both a & b |
| D. | neither a nor b |
| Answer» D. neither a nor b | |
| 356. |
Automobile steering wheels are normally made of |
| A. | cellulose acetate |
| B. | cellulose nitrate |
| C. | PVC |
| D. | high density polythene |
| Answer» B. cellulose nitrate | |
| 357. |
Lavatory cisterns are normally made of |
| A. | expanded polystyrene |
| B. | saturated polyester |
| C. | perspex |
| D. | PVC |
| Answer» B. saturated polyester | |
| 358. |
Buna-S is a __________ material. |
| A. | fibrous |
| B. | plastic |
| C. | resinous |
| D. | rubbery |
| Answer» E. | |
| 359. |
Visco-elastic behaviour exhibited by plastics is a __________ like behaviour. |
| A. | solid |
| B. | liquid |
| C. | combination of solid & liquid |
| D. | neither solid nor liquid |
| Answer» D. neither solid nor liquid | |
| 360. |
Which of the following is generally not used as eord for synthetic rubber tyre casing ? |
| A. | Dacron |
| B. | Nylon |
| C. | Cellulose |
| D. | None of these |
| Answer» D. None of these | |
| 361. |
__________ is not a polyester fibre. |
| A. | Terylene |
| B. | Dacron |
| C. | Nylon |
| D. | Polyacrylonitrite |
| Answer» D. Polyacrylonitrite | |
| 362. |
The synthetic fibres produced from __________ are known as rayon. |
| A. | lignin |
| B. | cellulose |
| C. | polyamides |
| D. | ethylene glycol |
| Answer» C. polyamides | |
| 363. |
Celluloid is |
| A. | cellulose acetate |
| B. | regenerated cellulose |
| C. | cellulose nitrate |
| D. | cellulose acetate butyrate |
| Answer» D. cellulose acetate butyrate | |
| 364. |
Peptizers like aromatic mercaptans (e.g. thiophenes) are added in rubber to |
| A. | protect rubber goods from attack by oxygen & ozone present in the atmosphere. |
| B. | reduce its viscosity to permit easier processing. |
| C. | reduce the time of vulcanisation and quantity of vulcanising agent. |
| D. | increase its viscosity. |
| Answer» C. reduce the time of vulcanisation and quantity of vulcanising agent. | |
| 365. |
Fusion point of an acidic refractory material is |
| A. | increased by the addition of basic oxides. |
| B. | reduced by the addition of basic oxides. |
| C. | not affected by the addition of basic oxides. |
| D. | always more than 2500 C. |
| Answer» C. not affected by the addition of basic oxides. | |
| 366. |
Which is required in an insulating refractory ? |
| A. | High thermal conductivity |
| B. | Low porosity |
| C. | Both (a) and (b) |
| D. | Neither (a) nor (b) |
| Answer» E. | |
| 367. |
'Super refractories' are made from pure |
| A. | carbides |
| B. | oxides |
| C. | borides |
| D. | nitrides |
| Answer» C. borides | |
| 368. |
Chromite refractories are |
| A. | acidic refractory. |
| B. | neutral refractory. |
| C. | basic refractory. |
| D. | fired at a temperature of 600 C only. |
| Answer» C. basic refractory. | |
| 369. |
Conversion of yellow phosphorous to red phosphorous is done by heating it in covered retorts at __________ C in absence of air. |
| A. | 50-80 |
| B. | 250-400 |
| C. | 1000-1200 |
| D. | 800-900 |
| Answer» C. 1000-1200 | |
| 370. |
Commercial fertilisers are available mostly in the form of |
| A. | powder |
| B. | grannules |
| C. | lumps |
| D. | flakes |
| Answer» C. lumps | |
| 371. |
Ammonia synthesis gas is produced from natural gas by |
| A. | thermal cracking |
| B. | steam reforming |
| C. | partial oxidation |
| D. | hydrogenation |
| Answer» C. partial oxidation | |
| 372. |
Caprolactum, a raw material for the manufacture of nylon-6, is produced from |
| A. | phenol |
| B. | naphthalene |
| C. | benzene |
| D. | pyridine |
| Answer» D. pyridine | |
| 373. |
The monomer of poly vinyl chloride (PVC) is |
| A. | chloroethene |
| B. | ethylene dichloride |
| C. | ethyl chloride |
| D. | chloroform |
| Answer» B. ethylene dichloride | |
| 374. |
Buna-S is also known as |
| A. | teflon |
| B. | PTFE |
| C. | SBR |
| D. | polycrylates |
| Answer» D. polycrylates | |
| 375. |
Regenerators are installed in |
| A. | coke ovens |
| B. | open hearth furnace |
| C. | both (a) & (b) |
| D. | neither (a) nor (b) |
| Answer» D. neither (a) nor (b) | |
| 376. |
Hydrogen bomb employs the nuclear fusion of |
| A. | hydrogen |
| B. | deuterium |
| C. | tritium |
| D. | helium |
| Answer» C. tritium | |
| 377. |
Sodium melts (at atmospheric pressure) at a temperature of __________ C. |
| A. | 58 |
| B. | 98 |
| C. | 348 |
| D. | 588 |
| Answer» C. 348 | |
| 378. |
The type of pump used for the recirculation of molten sodium coolant in liquid metal cooled reactor is a/an __________ pump. |
| A. | electromagnetic |
| B. | reciprocating |
| C. | centrifugal |
| D. | volute |
| Answer» B. reciprocating | |
| 379. |
Fast breeder Test Reactor (FBTR) is located at |
| A. | Kalpakkam (near Madras). |
| B. | Kota (in Rajasthan). |
| C. | BARC (Trombay). |
| D. | Tarapur (in Maharashtra). |
| Answer» B. Kota (in Rajasthan). | |
| 380. |
Tarapur atomic power station |
| A. | has two boiling water reactors of American design. |
| B. | has an installed capacity of 400 MW. |
| C. | is the first power reactor in India, which became critical in 1969. |
| D. | all (a), (b) and (c). |
| Answer» E. | |
| 381. |
The largest stable nucleus is |
| A. | U-235 |
| B. | U-238 |
| C. | Pb-206 |
| D. | Bi-209 |
| Answer» B. U-238 | |
| 382. |
MeV is the unit of |
| A. | radioactivity |
| B. | energy |
| C. | potential difference |
| D. | none of these |
| Answer» C. potential difference | |
| 383. |
In a nuclear explosion, the energy is released primarily in the form of __________ energy- |
| A. | potential |
| B. | thermal |
| C. | kinetic |
| D. | electrical |
| Answer» D. electrical | |
| 384. |
Which of the following is not, a fertile material ? |
| A. | Th-232 |
| B. | U-238 |
| C. | U-233 |
| D. | none of these |
| Answer» D. none of these | |
| 385. |
Hydrogen has __________ isotopes. |
| A. | no |
| B. | one |
| C. | two |
| D. | three |
| Answer» E. | |
| 386. |
Energy equivlant to one atomic mass unit (amu) is __________ MeV. |
| A. | 9.31 |
| B. | 93.1 |
| C. | 931 |
| D. | 9310 |
| Answer» D. 9310 | |
| 387. |
Molten sodium (as a coolant in fast breeder reactor) |
| A. | can't attain high temperature at normal pressure. |
| B. | is not at all corrosive, even at a higher temperature. |
| C. | is highly radioactive at elevated temperatures and can cause explosion, when it comes in contact with air or water. |
| D. | none of these |
| Answer» D. none of these | |
| 388. |
A nuclear reactor can't be used for |
| A. | the production of radioisotopes. |
| B. | supplying intense fields or beams of neutron for scientific experiments. |
| C. | marine ship propulsion. |
| D. | none of these. |
| Answer» E. | |
| 389. |
Final product of uranium extraction plant at Jadugoda (Bihar) is |
| A. | uranium |
| B. | uranium oxide |
| C. | uranium carbide |
| D. | magnesium diuranate |
| Answer» E. | |
| 390. |
Which one is the radioactive isotope of hydrogen ? |
| A. | Deuterium |
| B. | Ortho-hydrogen |
| C. | Tritium |
| D. | None of these |
| Answer» D. None of these | |
| 391. |
A homogeneous reactor is the one, in which the |
| A. | fissile atoms are evenly distributed throughout the mass of nuclear reactor. |
| B. | same substance (e.g. heavy water) is used as moderator & coolant. |
| C. | the fuel and the moderator is mixed to form a homogeneous material. |
| D. | all (a), (b) and (c). |
| Answer» D. all (a), (b) and (c). | |
| 392. |
The atomic number of a radioactive element is not changed, when it emits __________ rays. |
| A. | |
| B. | |
| C. | |
| D. | & |
| Answer» D. & | |
| 393. |
Which of the following is a moderating material used in nuclear reactor ? |
| A. | Graphite. |
| B. | Cadmium. |
| C. | Zircalloy (an alloy of zirconium and aluminium). |
| D. | Stainless steel. |
| Answer» B. Cadmium. | |
| 394. |
The decay product of tritium (a beta emitter) is |
| A. | lithium |
| B. | helium |
| C. | deuterium |
| D. | hydrogen |
| Answer» C. deuterium | |
| 395. |
Heat is generated in a nuclear reactor (thermal) by |
| A. | combustion of a nuclear fuel e.g. uranium. |
| B. | fusion of atoms of uranium. |
| C. | absorption of neutrons in uranium atoms. |
| D. | fission of U-235 by neutrons. |
| Answer» E. | |
| 396. |
The time taken for a radioactive element to reduce to 50% of its original weight is __________ years, if its half life period is 12 years. |
| A. | 24 |
| B. | 18 |
| C. | 6 |
| D. | 36 |
| Answer» C. 6 | |
| 397. |
Which of the following may not need a moderator ? |
| A. | Candu reactor |
| B. | Fast breeder reactor |
| C. | Homogeneous reactor |
| D. | Pressurised water reactor |
| Answer» C. Homogeneous reactor | |
| 398. |
The amount of a radioisotope remaining undecayed after a time equal to four times its half life, will be __________ percent. |
| A. | 3.125 |
| B. | 6.25 |
| C. | 12.50 |
| D. | 25 |
| Answer» C. 12.50 | |
| 399. |
Which is the most commonly used molten metal for cooling of nuclear reactors ? |
| A. | Calcium |
| B. | Sodium |
| C. | Mercury |
| D. | Zinc |
| Answer» C. Mercury | |
| 400. |
The amount of a radioactive material (having a half life of 100 years) remaining after 400 years will be __________ of its original weight. |
| A. | 1/2 |
| B. | 1/4 |
| C. | 1/8 |
| D. | 1/16 |
| Answer» E. | |