Free Chemical Process Principles MCQs with Answers
2,710 Chemical Process Principles MCQs from Chemical Engineering, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
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1321. Fast breeder reactors are most usable in India, because of our largest _____________ deposits?
- A. Plutonium
- B. Thorium
- C. Uranium
- D. None of these
Explanation: India has very large thorium reserves, while its uranium resources are comparatively limited.
Correct answer: Thorium- A. 1836 (approximately)
- B. 1
- C. 1/1836 (approximately)
- D. ∞
Explanation: An electron is about 1836 times lighter than a proton, so its mass is approximately 1/1836 of the proton mass.
Correct answer: 1/1836 (approximately)- A. Breeder reactor
- B. Liquid metal (e.g., molten sodium) cooled reactor
- C. Heterogeneous reactor
- D. Research reactor
Explanation: Research reactors are designed to provide intense neutron beams for experiments, isotope production, and material testing, often at…
Correct answer: Research reactor- A. 10-24 cm2
- B. 10-12 cm
- C. 1 Angstrom
- D. 10-24 cm
Explanation: A barn is a unit of nuclear cross-sectional area equal to 10^-24 cm², or 10^-28 m².
Correct answer: 10-24 cm2- A. Electronic configuration
- B. Mass number
- C. Nuclear charge
- D. Chemical properties
Explanation: Isotopes have the same number of protons but different numbers of neutrons, so their mass numbers differ.
Correct answer: Mass number- A. Resembles steel in appearance
- B. Is less hard (in the range of silver)
- C. All A., B. and C.
- D. Is highly ductile
Explanation: Thorium is a silvery-grey metal resembling steel, and it is relatively soft and ductile.
Correct answer: All A., B. and C.- A. U-238
- B. U-234
- C. U-235
- D. U-232
Explanation: Natural uranium contains mainly U-238, with small amounts of U-235 and U-234.
Correct answer: U-232- A. 85
- B. 50
- C. 3
- D. 97
Explanation: Power-reactor fuel is commonly enriched to about 3% U-235, compared with roughly 0.7% in natural uranium.
Correct answer: 3- A. Fermi
- B. °Angstrom
- C. Micron
- D. mm
Explanation: An atom typically has a diameter of about 1 angstrom, or 10⁻¹⁰ m. A fermi is about 10⁻¹⁵ m and is associated with nuclear dimensions, not…
Correct answer: °Angstrom- A. Of uncertainty principle
- B. It may have isobars
- C. It may have isotopes
- D. It contains neutrons
Explanation: Natural elements usually contain several isotopes with different masses, so their reported atomic mass is a weighted average and may be…
Correct answer: It may have isotopes- A. Chemical
- B. Nuclear
- C. Physical
- D. None of these
Explanation: Radioactive decay changes the nucleus by processes such as alpha emission, beta emission, or gamma emission.
Correct answer: Nuclear- A. Electrons
- B. Neutrons
- C. Neutrons plus protons (i.e., nucleons)
- D. Protons
Explanation: Mass number is the total number of nucleons in the nucleus, so it equals protons plus neutrons.
Correct answer: Neutrons plus protons (i.e., nucleons)- A. Isotopes
- B. None of these
- C. Isotones
- D. Isobars
Explanation: Isobars have the same mass number but different atomic numbers, meaning their nuclei contain the same total nucleons but different proton…
Correct answer: Isobars- A. 20
- B. 200
- C. 1000
- D. 2000
Explanation: Fission of a heavy nucleus such as uranium releases about 200 MeV per fission event.
Correct answer: 200- A. Calcium
- B. Sodium
- C. Mercury
- D. Zinc
Explanation: Molten sodium is widely used as a nuclear-reactor coolant because it transfers heat effectively and has a high boiling point, allowing…
Correct answer: Sodium- A. 0.015
- B. 7.54
- C. 0.71
- D. 32.97
Explanation: Naturally occurring heavy water is present at roughly 0.015% of ordinary water, mainly as deuterium-containing molecules.
Correct answer: 0.015- A. 1
- B. 0.5
- C. 2
- D. 4
Explanation: The neutron number is mass number minus atomic number: 80 − 40 = 40. Since the proton number is 40, the neutron-to-proton ratio is 40/40 =…
Correct answer: 1- A. α-ray
- B. Proton
- C. Position
- D. β-ray
Explanation: Ordinary radioactive decay commonly produces alpha particles, beta particles and gamma radiation, not emitted protons.
Correct answer: Proton- A. Slow down the secondary neutrons
- B. Absorb the fast neutrons
- C. Protect the walls of the reactor from radiation damage
- D. Protect the fuel element from coming in contact with the coolant
Explanation: A thermal shield absorbs and attenuates energy from reactor radiation, reducing irradiation and radiation damage to the reactor walls or…
Correct answer: Protect the walls of the reactor from radiation damage1340. Commercial power generation from fusion reactor is not yet possible, because___________________?
- A. Quantity of fuel required for initiating fusion reaction is prohibitively high
- B. The fuel required (i.e., deuterium & tritium) is scarce
- C. It is difficult to initiate fusion reaction
- D. It is difficult to control nuclear fusion reaction
Explanation: Fusion requires an extremely hot plasma and must be initiated and maintained without losing control through instabilities and energy…
Correct answer: It is difficult to control nuclear fusion reaction