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.
| 251. |
Which of the following radiations is the least penetrating? |
| A. | α-rays |
| B. | β-rays |
| C. | γ-rays |
| D. | X-rays |
| Answer» B. ≈í‚â§-rays | |
| 252. |
Heavy water (D‚ÇÇO) in a nuclear reactor serves as a$ |
| A. | Coolant |
| B. | Moderator |
| C. | Both A & B |
| D. | Neutron absorber |
| Answer» D. Neutron absorber | |
| 253. |
Which of the following is not an ore of uranium? |
| A. | Pitchblende |
| B. | Kyanite |
| C. | Carnotite |
| D. | Rescolite |
| Answer» C. Carnotite | |
| 254. |
Which of the following is the most harmful for the human being? |
| A. | Β-rays |
| B. | X-rays |
| C. | Γ-rays |
| D. | Ultra violet rays |
| Answer» D. Ultra violet rays | |
| 255. |
Which is used as a coolant in nuclear reactor due to its high capture cross-section? |
| A. | H‚ÇÇ |
| B. | N‚ÇÇ |
| C. | He |
| D. | CO‚ÇÇ |
| Answer» B. N‚Äö√á√á | |
| 256. |
Which of the following is not a good moderating material? |
| A. | Concrete |
| B. | Boron |
| C. | 18/8 stainless steel |
| D. | All of the above |
| Answer» E. | |
| 257. |
Which of the following nuclear materials is fissile? |
| A. | Uranium⁻²38 |
| B. | Thorium⁻²32 |
| C. | Plutonium⁻²39 |
| D. | None of these |
| Answer» D. None of these | |
| 258. |
Which one is radioactive in nature? |
| A. | Helium |
| B. | Deuterium |
| C. | Heavy hydrogen |
| D. | Tritium |
| Answer» E. | |
| 259. |
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 | |
| 260. |
How many atoms are present in one gm-atom of an element? |
| A. | 2 x 10²³ |
| B. | 6 x 10²³ |
| C. | 6 x 10³² |
| D. | 5 x 10? |
| E. | 5 x 10⁵ |
| Answer» C. 6 x 10¬¨‚╬¨‚⧠| |
| 261. |
Heavy water has maximum density at __________ °C.$ |
| A. | 4 |
| B. | 11.6 |
| C. | 0 |
| D. | 18.6 |
| Answer» C. 0 | |
| 262. |
Fast breeder test reactor at Kalpakkam is designed for using |
| A. | thorium as a fertile material. |
| B. | U-238 as a fertile material. |
| C. | helium as a coolant. |
| D. | uranium ore directly as a fuel. |
| Answer» B. U-238 as a fertile material. | |
| 263. |
Thorium metal |
| A. | resembles steel in appearance. |
| B. | is less hard (in the range of silver). |
| C. | is highly ductile. |
| D. | all (a), (b) and (c). |
| Answer» E. | |
| 264. |
__________ nuclear reactor does not require a heat exchanger to supply steam to power turbine. |
| A. | Molten sodium cooled |
| B. | Helium cooled |
| C. | Boiling water |
| D. | Pressurised water |
| Answer» D. Pressurised water | |
| 265. |
Which of the following radiations is the least penetrating ? |
| A. | α-rays |
| B. | β-rays |
| C. | γ-rays |
| D. | X-rays |
| Answer» B. Œ≤-rays | |
| 266. |
The phenomenon of radioactivity was discovered by |
| A. | Madam Curie |
| B. | Bacquerrel |
| C. | Roentgen |
| D. | J.J. Thomson |
| Answer» C. Roentgen | |
| 267. |
If 4 gm of a radioisotope has a half life period of 10 days, the half life of 2 gm of the same istotope will be __________ days. |
| A. | 5 |
| B. | 10 |
| C. | 20 |
| D. | 30 |
| Answer» C. 20 | |
| 268. |
Fuel for a nuclear reactor (thermal) is |
| A. | uranium |
| B. | plutonium |
| C. | radium |
| D. | none of these |
| Answer» B. plutonium | |
| 269. |
Which of the following is a non-fissile material ? |
| A. | Plutonium-239 |
| B. | Uranium-235 |
| C. | Uranium-233 |
| D. | Thorium-232 |
| Answer» E. | |
| 270. |
Critical energy should be __________ the neutron binding energy of the atom in order to initiate a nuclear fission. |
| A. | equal to |
| B. | less than |
| C. | more than |
| D. | either more or less |
| Answer» D. either more or less | |
| 271. |
Water is a better coolant than a gas (like CO2, He, N2 etc.), because it |
| A. | is a better neutron moderator as well. |
| B. | requires comparatively smaller pumps and heat exchanger for a given heat transfer rate. |
| C. | has a better heat transfer characteristics, and it can be pressurised to attain a high temperature. |
| D. | all (a), (b) and (c). |
| Answer» E. | |
| 272. |
Which of the following ores contains maximum percentage of uranium ? |
| A. | Carnotite |
| B. | Thorium. |
| C. | Rescolite |
| D. | Pitchblende |
| Answer» E. | |
| 273. |
The ratio of atomic radius to its nuclear radius is about |
| A. | 105 |
| B. | 108 |
| C. | 1012 |
| D. | 1015 |
| Answer» B. 108 | |
| 274. |
A pressurised water reactor (PWR) uses pressurised water as a |
| A. | coolant. |
| B. | working fluid in power turbine. |
| C. | moderator. |
| D. | none of these. |
| Answer» B. working fluid in power turbine. | |
| 275. |
Which of the following reactors is operated at high neutron flux and low power level ? |
| A. | Breeder reactor. |
| B. | Research reactor. |
| C. | Heterogeneous reactor. |
| D. | Liquid metal (e.g., molten sodium) cooled reactor. |
| Answer» C. Heterogeneous reactor. | |
| 276. |
Atoms with same number of neutrons, but different number of nucleons are called |
| A. | isotones |
| B. | isobars |
| C. | isotopes |
| D. | isoters |
| Answer» B. isobars | |
| 277. |
The main ore of thorium is |
| A. | pitchblende |
| B. | monazite sand |
| C. | limonite |
| D. | galena |
| Answer» C. limonite | |
| 278. |
Coolant used in a fast breeder reactor is |
| A. | molten sodium |
| B. | heavy water |
| C. | ordinary water |
| D. | helium |
| Answer» B. heavy water | |
| 279. |
__________ moderator is used in a fast breeder reactor. |
| A. | Graphite |
| B. | Heavy water |
| C. | Beryllium |
| D. | No |
| Answer» E. | |
| 280. |
Which of the following undergoes fission reaction easily ? |
| A. | U-235 |
| B. | U-238 |
| C. | Th-232 |
| D. | none of these |
| Answer» B. U-238 | |
| 281. |
Absorption/scattering cross-section of an element is expressed in "barn", which is equivalent to |
| A. | 10-24 cm2 |
| B. | 10-12 cm |
| C. | 1 Angstrom |
| D. | 10-24 cm |
| Answer» B. 10-12 cm | |
| 282. |
A moderator __________ the neutrons. |
| A. | slows down |
| B. | absorbs |
| C. | accelerates |
| D. | reflects |
| Answer» B. absorbs | |
| 283. |
Liquid metal (e.g, . molten sodium) is preferred as a coolant in case of a/an __________ reactor. |
| A. | homogeneous |
| B. | graphite moderated |
| C. | fast breeder |
| D. | enriched uranium (3% U-235) fuelled |
| Answer» D. enriched uranium (3% U-235) fuelled | |
| 284. |
Indian monazite sand contains __________ percent thorium. |
| A. | 10 |
| B. | 25 |
| C. | 60 |
| D. | 90 |
| Answer» B. 25 | |
| 285. |
Percentage of natural uranium present in uranium ore found in Jadugoda (Jharkhand) is |
| A. | 0.1 |
| B. | 1 |
| C. | 3 |
| D. | 12 |
| Answer» B. 1 | |
| 286. |
The specific heats of three gaseous coolants namely H2, He and CO2 in the increasing order are |
| A. | CO2, He, H2 |
| B. | CO2, H2, He |
| C. | H2, He, CO2 |
| D. | H2, CO2, He |
| Answer» B. CO2, H2, He | |
| 287. |
The main purpose of control rod in a nuclear reactor is to control the |
| A. | chain reaction and hence the power output by regulating the number of secondary neutrons causing fission. |
| B. | emission of hazardous radiation. |
| C. | conversion of fissile material into fertile material. |
| D. | velocity of the secondary neutrons. |
| Answer» B. emission of hazardous radiation. | |
| 288. |
Thorium can be converted into U-233 in a __________ reactor. |
| A. | liquid metal cooled |
| B. | fast breeder |
| C. | thermal |
| D. | swimming pool |
| Answer» C. thermal | |
| 289. |
When the difference between mass number and atomic number of atoms of two or more elements are same, the atoms are termed as |
| A. | isomers |
| B. | isotopes |
| C. | isobars |
| D. | isotones |
| Answer» E. | |
| 290. |
Heavy water has maximum density at __________ °C.$ |
| A. | 4 |
| B. | 11.6 |
| C. | 0 |
| D. | 18.6 |
| Answer» C. 0 | |
| 291. |
'Heavy water' is termed as 'heavy' because it is |
| A. | denser than water. |
| B. | an oxide of deuterium. |
| C. | a heavy liquid. |
| D. | an oxide of heavier isotope of oxygen. |
| Answer» C. a heavy liquid. | |
| 292. |
How many atoms are present in one gm-atom of an element ? |
| A. | 2 x 1023 |
| B. | 6 x 1023 |
| C. | 6 x 1032 |
| D. | 5 x 105 |
| Answer» C. 6 x 1032 | |
| 293. |
The molecular weight of heavy water is |
| A. | 10 |
| B. | 18 |
| C. | 20 |
| D. | 36 |
| Answer» D. 36 | |
| 294. |
The half life period of a radiactive element is 100 days. After 400 days, one gm of the element will be reduced to __________ gm. |
| A. | 43556 |
| B. | 43678 |
| C. | 43497 |
| D. | 42370 |
| Answer» E. | |
| 295. |
The half life period of a radioactive substance is best determined by counting the number of alpha particles emitted per second in a Geiger Muller counter from its known quantity. If the half life period of a radioactive substance is one month, then |
| A. | 3/4th of it will disintegrate in two months. |
| B. | it will completely disintegrate in two months. |
| C. | it will completely disintegrate in four months. |
| D. | l/8th of it will remain intact at the end of four months. |
| Answer» C. it will completely disintegrate in four months. | |
| 296. |
Radioactive decay of a material involves a __________ order reaction. |
| A. | third |
| B. | second |
| C. | first |
| D. | zero |
| Answer» D. zero | |
| 297. |
Which of the following is present in Bhabha Atomic Research Centre (BARC) complex, Trombay (Bombay) ? |
| A. | Power reactor |
| B. | Research reactor |
| C. | Fast breeder reactor |
| D. | Heavy water plant |
| Answer» C. Fast breeder reactor | |
| 298. |
In the nuclear reaction, 93N239 94Pu239 + ?; the missing particle is a/an |
| A. | electron |
| B. | proton |
| C. | neutron |
| D. | position |
| Answer» B. proton | |
| 299. |
Which of the following is not a good moderating material ? |
| A. | Concrete |
| B. | Boron |
| C. | 18/8 stainless steel |
| D. | All (a), (b) and (c) |
| Answer» E. | |
| 300. |
A fertile material is the one, which can be |
| A. | converted into fissile material on absorption of neutron. |
| B. | fissioned by slow (thermal) neutrons. |
| C. | fissioned by fast neutrons. |
| D. | fissioned by either slow or fast neutrons. |
| Answer» B. fissioned by slow (thermal) neutrons. | |