Description : Which of the following men was involved with the first controlled nuclear reaction? w) Linus Pauling x) Nelson Sartoris y) Edward Teller z) Enrico Fermi
Last Answer : ANSWER: Z -- ENRICO FERMI
Description : Natural radioactivity was discovered by - (1) Marie Curie (2) Ernest Rutherfor (3) Henri Becquerel (4) Enrico Fermi
Last Answer : (3) Henri Becquerel Explanation: The Discovery of Radioactivity. In 1896 Henri Becquerel was using naturally fluorescent minerals to study the properties of xrays, which had been discovered in 1895 by Wilhelm Roentgen.
Description : Which of the following may be used to measure the rate of nuclear disintegration? (A) Geiger-Muller Counter (B) Cyclotron (C) Cold chamber (D) Mass spectrograph
Last Answer : (A) Geiger-Muller Counter
Description : Nuclear sizes are expressed in a unit named - (1) Fermi (2) Angstrom (3) Newton (4) Tesla
Last Answer : (1) Fermi Explanation: The fermi (1 fm = 10⁻¹⁵ m) is of the order of magnitude of the size of nucleons and nuclei, so it is more appropriate to describe sizes for nuclear phenomena.
Description : The most suitable unit for expressing nuclear radius is - (1) nanometre (2) fermi (3) angstrom (4) micron
Last Answer : (2) fermi Explanation: The atomic radius is a measure of the size of an atom. It is defined as one half the distance between the nuclei of two identical atoms that are bonded together. Angstrom is the most common unit used for measuring atomic radius.
Description : Which unit we use to express nuclear sizes? (1) Tesla (2) Newton (3) Fermi (4) None of above
Last Answer : (3) Fermi
Description : First experimental observation of nuclear fission was done by (A) Plane (B) Rutherford (C) Fermi (D) Hahn and Strassmann
Last Answer : (C) Fermi
Description : The most suitable unit for expressing nuclear radius is : (1) nanometre (2) fermi (3) angstrom (4) micron
Last Answer : angstrom
Description : The device used for measuring the wavelength of X-rays is – (1) G.M. Counter (2) Cyclotron (3) Bragg Spectrometer (4) Mass Spectrometer
Last Answer : (3) Bragg Spectrometer Explanation: Bragg Spectrometer is an instrument used to analyze crystal structure by using X-rays. In it, a beam of collimated X-rays strikes the crystal, and a detector measures the angles and intensities of the reflected beam.
Description : The device used for measuring the wavelength of X-rays is (1) G.M. Counter (2) Cyclotron (3) Bragg Spectrometer (4) Mass Spectrometer
Last Answer : Bragg Spectrometer
Description : Manoj's father works in a nuclear power reactor. He asked his father to take him for a visit to nuclear power reactor. But his father was not keen to take him there. Now answer the following ... could be the possible reason of Manoj's father not taking him to the nuclear power reactor? -Science
Last Answer : a) (i) Safety concerns. (ii) Health concerns. (b) Advantage: From a small amount of nuclear fuel, a large amount of energy is released in a nuclear power reactor. Disadvantage: There is risk of harmful radiation leakage from nuclear waste.
Description : Which element is used as moderator in nuclear reactor? A. Light water B. Dense water C. Fresh water D. Heavy water (Answer)
Last Answer : D. Heavy water (Answer)
Description : A nuclear reactor is a device used to carry out controlled nuclear reaction whereas GM counter is a device used to detect? A. Current B. Voltage C. Nuclear Radiation (Answer) D. power E. None of these
Last Answer : C. Nuclear Radiation (Answer)
Description : A moderator is used in nuclear reactor in order to ? A. Accelerate the neutrons B. Slow down the speed of the neutrons (Answer) C. Increase the number of elections D. Decrease the number of electrons E. None of these
Last Answer : B. Slow down the speed of the neutrons (Answer)
Description : Cyclotron is used to accelerate
Last Answer : Cyclotron is used to accelerate A. protons B. deutrons C. neutrons D. electrons
Description : In cyclotron for a given magnet radius of the semicircle traced by positive ion is directly proportional to (where v= velocity of positive ion)
Last Answer : In cyclotron for a given magnet radius of the semicircle traced by positive ion is directly proportional to (where v= ... 1)` C. `v` D. `v^(2)`
Last Answer : Cyclotron is used to accelerate A. Only negatively charged particles B. neutron C. Both ... charged paticles D. Only positively charged particles
Description : The maximum energy of a deuteron coming out a cyclotron is 20 MeV. The maximum energy of proton that can be obtained from this acceleration is
Last Answer : The maximum energy of a deuteron coming out a cyclotron is 20 MeV. The maximum energy of proton that can be ... MeV B. 20 MeV C. 30 MeV D. 40 MeV
Description : In a cyclotron, a charged particle
Last Answer : In a cyclotron, a charged particle A. undergoes acceleration all the time B. speeds up between the ... down within a dee and speeds up between dees
Description : Which of the following cyclotron produced radiopharmaceuticals is used for assessing regional myocardial perfusion as part of an exercise stress test? (a) Thallous chloride 201TI USP (b) Sodium iodide 123I (c) Gallium citrate 67Ga USP (d) Indium 111In pentetate (e) Cobalt 57Co cyanocobalamin
Last Answer : Ans: A
Description : Who constructed the first cyclotron?
Last Answer : ANSWER: (ERNEST O.) LAWRENCE
Description : The idea that we CANNOT know both the position and velocity of a subatomic particle at the same time was formulated by: w) Einstein x) Heisenberg y) Fermi z) Schroedinger
Last Answer : ANSWER: X -- HEISENBERG
Description : The dark lines constituting the absorption spectrum exhibited by sunlight are frequently called: w) Fresnel lines x) Fraunhofer lines y) Fermi lines z) Franklin lines
Last Answer : ANSWER: X -- FRAUNHOFER LINES
Description : The random motion of particles suspended in a fluid is called: w) Boson Condensation x) Fermi Motion y) Brownian Motion z) Pauli Motion
Last Answer : ANSWER: Y -- BROWNIAN MOTION
Description : Most of the new atoms formed when atoms in a nuclear reactor capture neutrons without fissioning are: w) fission products x) activation products y) actinides z) lead isotopes
Last Answer : ANSWER: Y -- ACTINIDES
Description : Reactors in commercial nuclear power plants in the U.S. are often referred to as thermal reactors. A thermal reactor uses: w) fissionable plutonium-239 as fuel. x) a relatively low heat output. y) neutrons moderated to relatively low energies. z) liquid sodium as a coolant.
Last Answer : ANSWER: Y -- NEUTRONS MODERATED TO RELATIVELY LOW ENERGIES.
Description : Of the following, which is the best fuel for a nuclear fusion reactor: w) hydrogen x) lithium y) deuterium z) helium
Last Answer : ANSWER: Y -- DEUTERIUM
Description : The part of a nuclear power plant that prevents thermal pollution of lakes or rivers is the: w) reactor x) coolant/moderator y) cooling tower z) control rod
Last Answer : ANSWER: Y -- COOLING TOWER
Description : The most serious environmental pollution from a nuclear reactor is: w) radioactivity x) particulate formation y) thermal pollution z) noise pollution
Last Answer : ANSWER: Y -- THERMAL POLLUTION
Description : What substance was used as a moderator for the chain reaction in the first nuclear reactor? w) graphite x) boron y) water z) cadmium
Last Answer : ANSWER: W -- GRAPHITE
Description : An important safety feature required at U.S. nuclear power plants that was not present at the Chernobyl Power Plant in the Soviet Union was the: w) reactor x) cooling water y) control rods z) containment building
Last Answer : ANSWER: Z -- CONTAINMENT BUILDING
Last Answer : X-ray discoverer (W. K. Ranjen (German), 1895)
Last Answer : X-ray discovers rontgen.
Description : Alfred Nobel invented - (1) X ray (2) Diesel Engine (3) Dynamite (4) Dynamo
Last Answer : (3) Dynamite Explanation: Alfred Nobel if Sweden invented Dynamite in 1867, X ray was invented by Wilhelm Roentgen of Germany in 1895, Diesel Engine was invented by Rudolf Diesel of Germany 1892, Dynamo was invented by Michael Faraday of England in 1831.
Description : What is the Fermi paradox?
Last Answer : The Fermi paradox is the apparent contradiction between the high probability of the existence of extraterrestrial civilizations, as suggested by the Drake equation, and the lack of evidence for their existence, and has been the subject of much speculation and debate.
Description : What is the Fermi-Dirac statistics?
Last Answer : The Fermi-Dirac statistics is a type of quantum statistics that describes the behavior of fermions, which are a type of subatomic particle that follow the rules of quantum mechanics, and are important in many areas of physics, including the behavior of electrons in solids.
Last Answer : The Fermi paradox is the apparent contradiction between the high likelihood of the existence of extraterrestrial civilizations and the lack of evidence for their existence
Description : What is your solution to or thoughts on the Fermi paradox?
Last Answer : answer:The size of the universe combined with the age of the universe makes the probability ridiculous. Consider that humans have only had written communication (And by that I mean the ability to ... it makes sense to believe that there may be advanced intelligent life out there somewhere, somewhen.
Description : The Fermi Paradox asks, "Where is everybody?" Could intelligent life be mostly self extinguishing?
Last Answer : answer:It's a good piece, and the overall thesis is worth thinking about. Still, it seems to me that there are several alternatives to the pessimistic hypothesis that intelligent life extinguishes ... think about how far away a civilization in another solar system-or even another galaxy-would be.
Description : The name of the scientist who discovered neutron is - (1) Fermi (2) Rutherford (3) Chadwick (4) Bohr
Last Answer : (3) Chadwick Explanation: Sir James Chadwick, CH, FRS (20 October 1891 – 24 July 1974) was a British physicist who was awarded the 1935 Nobel Prize in Physics for his discovery of the neutron in 1932.
Description : Neutron was discovered by - (1) Chadwick (2) Rutherford (3) Fermi (4) Bohr
Last Answer : (1) Chadwick Explanation: Neutron was discovered by James Chadwick in the year 1932. The neutron is a subatomic particle, symbol n or n⁰, with no net electric charge and a mass slightly larger than that of a proton. Protons and neutrons constitute the nuclei of atoms.
Description : Unit of radioactivity is (A) Barn (B) Fermi (C) Angstrom (D) Curie
Last Answer : (D) Curie
Description : The size of an atom is of the order of one (A) °Angstrom (B) Fermi (C) Micron (D) mm
Last Answer : (A) °Angstrom
Description : Which of the following properties distinguish a material as conductor, insulator and semiconductor? a) Free electron charges b) Fermi level after doping c) Energy band gap d) Electron density
Last Answer : c) Energy band gap
Description : The dark lines constituting the absorption spectrum exhibited by sunlight are frequently called: A. Fresnel lines B. Fraunhofer lines C. Fermi lines D. Franklin lines
Last Answer : B. Fraunhofer lines
Description : Define (i) Intrinsic semiconductor (ii)Fermi energy level
Last Answer : (i) Intrinsic semiconductor: The semiconductor in extremely pure form is called as intrinsic semiconductor. (ii) Fermi energy level : The energy difference between conduction band and valence band is called as fermi energy level.
Description : In a single crystal of an intrinsic semiconductor, the number of free carriers at the Fermi level at room temperature is: A) Half the total number of electrons in the crystal B) Zero C) Half the number of atoms in the crystal D) Half the number of free electrons in the crystal
Last Answer : In a single crystal of an intrinsic semiconductor, the number of free carriers at the Fermi level at room temperature is: Zero
Description : In an n-type semiconductor, as the donor concentration ND increases, the Fermi level EF: (1) Remains unaltered (2) Moves towards the conduction band (3) Move towards the center of forbidden energy gap (4) May or may not move depending on temperature
Last Answer : In an n-type semiconductor, as the donor concentration ND increases, the Fermi level EF: Moves towards the conduction band
Description : Fermi level is the measure of (A) Doping of electrons (B) Probability of occupancy of electrons or holes (C) Probability of occupancy of photons (D) Probability of occupancy of wavelength
Last Answer : (C) Probability of occupancy of photons