MCQOPTIONS
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MCQOPTIONS
This section includes 486 Mcqs, each offering curated multiple-choice questions to sharpen your Chemical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 401. |
A radioactive substance does not emit |
| A. | α-ray |
| B. | proton |
| C. | position |
| D. | β-ray |
| Answer» C. position | |
| 402. |
MeV is the unit of |
| A. | radioactivity |
| B. | energy |
| C. | potential difference |
| D. | none of these |
| Answer» C. potential difference | |
| 403. |
The atomic number of an element is equal to the number of __________ present in its atom. |
| A. | neutrons |
| B. | electrons |
| C. | protons |
| D. | either (b) or (c) |
| Answer» E. | |
| 404. |
The new nucleus formed after β-decay of a radioactive element has$ |
| A. | less atomic number |
| B. | less atomic weight |
| C. | more atomic number |
| D. | more atomic weight |
| Answer» B. less atomic weight | |
| 405. |
Commercial power generation from fusion reactor is not yet possible, because |
| A. | it is difficult to control nuclear fusion reaction. |
| B. | the fuel required (i.e., deuterium & tritium) is scarce. |
| C. | it is difficult to initiate fusion reaction. |
| D. | quantity of fuel required for initiating fusion reaction is prohibitively high. |
| Answer» B. the fuel required (i.e., deuterium & tritium) is scarce. | |
| 406. |
A radioactive isotope undergoes decay with respect to time following __________ law. |
| A. | logarithmic |
| B. | exponential |
| C. | linear |
| D. | inverse square |
| Answer» C. linear | |
| 407. |
Which one is the radioactive isotope of hydrogen ? |
| A. | Deuterium |
| B. | Ortho-hydrogen |
| C. | Tritium |
| D. | None of these |
| Answer» D. None of these | |
| 408. |
Which is a fertile nuclear fuel ? |
| A. | U-233 |
| B. | U-235 |
| C. | Pu-239 |
| D. | Th-232 |
| Answer» E. | |
| 409. |
Which of the following is not used as a moderator in nuclear reactor ? |
| A. | Molten sodium |
| B. | Light water |
| C. | Beryllium |
| D. | Boron hydride |
| Answer» B. Light water | |
| 410. |
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. | 12.5 |
| D. | 25 |
| Answer» C. 12.5 | |
| 411. |
"Critical mass" is the minimum mass of nuclear fissile material required for the |
| A. | sustainment of chain reaction. |
| B. | power generation on commercial scale. |
| C. | economic power generation. |
| D. | none of these. |
| Answer» B. power generation on commercial scale. | |
| 412. |
Isotopes of an element have the same |
| A. | number of neutrons |
| B. | mass number |
| C. | electronic configuration |
| D. | atomic weight |
| Answer» D. atomic weight | |
| 413. |
Enrichment of uranium is done to increase the concentration of __________ in the natural uranium. |
| A. | U-238 |
| B. | U-233 |
| C. | U-235 |
| D. | Pu-239 |
| Answer» D. Pu-239 | |
| 414. |
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). | |
| 415. |
Nuclear reactors are provided with shield to guard against the emission of mainly __________ rays. |
| A. | X |
| B. | α and β |
| C. | neutrons & gamma |
| D. | infrared |
| Answer» D. infrared | |
| 416. |
Atoms of U-238 and U-235 differ in structure by three |
| A. | electrons and three protons |
| B. | protons |
| C. | neutrons |
| D. | electrons |
| Answer» D. electrons | |
| 417. |
The phenomenon of nuclear fission is opposite to that of |
| A. | radioactive decay |
| B. | thermionic emission |
| C. | nuclear fusion |
| D. | combustion |
| Answer» D. combustion | |
| 418. |
Enriched uranium means that, it contains |
| A. | more than 0.71% of U-235. |
| B. | only fertile material. |
| C. | only fissile material. |
| D. | no impurities. |
| Answer» B. only fertile material. | |
| 419. |
Which of the following is not used as a nuclear fuel cladding material ? |
| A. | Zircalloy |
| B. | Cadmium |
| C. | Ceramics |
| D. | Stainless steel |
| Answer» C. Ceramics | |
| 420. |
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 | |
| 421. |
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. | |
| 422. |
Moderating material used in a thermal-reactor should be a |
| A. | good absorber of neutrons. |
| B. | solid substance. |
| C. | poor absorber of neutrons. |
| D. | none of these. |
| Answer» D. none of these. | |
| 423. |
A boiling water reactor is the one, in which the |
| A. | coolant water is allowed to boil in the core of the reactor. |
| B. | coolant water, after being heated in the reactor core, generates steam in a boiler. |
| C. | pressurised water is pumped into the core. |
| D. | fuel and the coolant are thoroughly mixed to form a homogeneous solution. |
| Answer» B. coolant water, after being heated in the reactor core, generates steam in a boiler. | |
| 424. |
Nuclear power generation capacity in India is |
| A. | 3000 MW. |
| B. | 10000 MW. |
| C. | more than hydroelectric power generation capacity. |
| D. | more than thermal power generation capacity. |
| Answer» B. 10000 MW. | |
| 425. |
Gas cooling as compared to water cooling of nuclear reactors |
| A. | can not attain a high temperature. |
| B. | is more efficient as gas has a higher specific heat. |
| C. | can produce only saturated steam for feeding to power turbine. |
| D. | none of these. |
| Answer» E. | |
| 426. |
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. | |
| 427. |
The ratio of volume of an atom to that of its nucleus is |
| A. | 1012 |
| B. | 43809 |
| C. | 43687 |
| D. | 108 |
| Answer» B. 43809 | |
| 428. |
H2 is a better coolant than CO2, due to its relatively |
| A. | lower density. |
| B. | higher specific heat. |
| C. | non-reactivity to uranium. |
| D. | lower neutron capture cross-section. |
| Answer» C. non-reactivity to uranium. | |
| 429. |
Main source of __________ is monazite sand. |
| A. | uranium |
| B. | polonium |
| C. | hafnium |
| D. | thorium |
| Answer» E. | |
| 430. |
Radioactive decay is a __________ change. |
| A. | chemical |
| B. | nuclear |
| C. | physical |
| D. | none of these |
| Answer» C. physical | |
| 431. |
Uranium Corporation of India Limited (UCIL) engaged in the mining & concentration of uranium ore is located at |
| A. | Alwaye (in Kerala) |
| B. | Jadugoda (in Jharkhand) |
| C. | Kalpakkam (in Tamilnadu) |
| D. | Gopalpur coast (in Orissa) |
| Answer» C. Kalpakkam (in Tamilnadu) | |
| 432. |
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 | |
| 433. |
Velocity of the thermal neutron (< 0.025 eV) used for fission of U-235 is around __________ m/sec. |
| A. | 1 |
| B. | 2200 |
| C. | 3 x 1011 |
| D. | 9 x 1021 |
| Answer» C. 3 x 1011 | |
| 434. |
Thorium-232 is converted into uranium-233 in a/an __________ nuclear reactor. |
| A. | thermal |
| B. | fast breeder |
| C. | heavy water moderated |
| D. | enriched uranium |
| Answer» C. heavy water moderated | |
| 435. |
Sodium melts (at atmospheric pressure) at a temperature of __________ °C. |
| A. | 58 |
| B. | 98 |
| C. | 348 |
| D. | 588 |
| Answer» C. 348 | |
| 436. |
A control rod |
| A. | should have small absorption cross-section. |
| B. | is generally made of boron, hafnium or cadmium. |
| C. | should have large absorption cross-section. |
| D. | both (b) and (c). |
| Answer» E. | |
| 437. |
Nuclides having the same atomic numbers are termed as |
| A. | isotopes |
| B. | isomers |
| C. | isotones |
| D. | isobars |
| Answer» C. isotones | |
| 438. |
The mass number of an element is equal to the number of __________ in the nucleus. |
| A. | electrons |
| B. | neutrons |
| C. | protons |
| D. | neutrons plus protons (i.e., nucleons) |
| Answer» E. | |
| 439. |
Which of the following accounts for the maximum energy release in the nuclear fission process ? |
| A. | Kinetic energy of fission products |
| B. | Radioactive decay of fission products |
| C. | Instantaneous release of γ-rays |
| D. | Kinetic energy of neutrons |
| Answer» B. Radioactive decay of fission products | |
| 440. |
Thermal nuclear reactors using enriched uranium as fuel contains a maximum of __________ percent fissile material i.e. U-235. |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 7 |
| Answer» D. 7 | |
| 441. |
Nucleus of 92U235 contains __________ protons. |
| A. | 92 |
| B. | 235 |
| C. | 143 |
| D. | 325 |
| Answer» B. 235 | |
| 442. |
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. | |
| 443. |
Number of secondary neutron emitted on fission of an atom of U-235 by slow neutron bombardment is |
| A. | 3 |
| B. | 235 |
| C. | 200 |
| D. | 92 |
| Answer» B. 235 | |
| 444. |
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 | |
| 445. |
The emission of an a-particle causes the resultant nucleus to have |
| A. | more atomic weight and less atomic number. |
| B. | less atomic weight and less atomic number. |
| C. | less atomic weight and more atomic number. |
| D. | none of these. |
| Answer» B. less atomic weight and less atomic number. | |
| 446. |
Which of the following types of nuclear reactors is most prone to radioactive hazards ? |
| A. | Pressurised water reactor |
| B. | Gas cooled reactor |
| C. | Molten sodium cooled reactor |
| D. | Boiling water reactor |
| Answer» E. | |
| 447. |
Which is not a fissile nuclear material ? |
| A. | U-233 |
| B. | U-235 |
| C. | U-238 |
| D. | Pu-239 |
| Answer» D. Pu-239 | |
| 448. |
The function of moderators in nuclear reactor is to |
| A. | slow down the secondary neutrons. |
| B. | absorb the secondary neutrons. |
| C. | control the chain reaction. |
| D. | none of these. |
| Answer» B. absorb the secondary neutrons. | |
| 449. |
Which of the following gases has very high neutron capture cross-section, making it unsuitable as a coolant in nuclear reactor? |
| A. | N2 |
| B. | He |
| C. | CO2 |
| D. | H2 |
| Answer» B. He | |
| 450. |
The largest stable nucleus is |
| A. | U-235 |
| B. | U-238 |
| C. | Pb-206 |
| D. | Bi-209 |
| Answer» B. U-238 | |