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Radiochemistry and Nuclear Chemistry self-test # 2

Comprises Chapter 2

This is a self grading test of your knowledge. It consists of 20 randomly chosen questions with single or multiple answers. The questions with single answers have round buttons and the questions with perhaps more than one correct answer have square buttons. Answer the questions by clicking on the corresponding button in the list of alternative answers. On questions with a single answer (round buttons to click on), it is only possible to mark one of the alternative answers as correct.
Grading of the completed test is automatic when you click on the button marked "GRADE MY ANSWERS" at the end of the test.
Correct answers can be read by clicking on the button having the same number as the question. You find these buttons at the end of the test. You can also refresh your memory first by jumping directly to the answer buttons and click on them to get answers and read relevant parts of the book before doing this test.
On the questions with one or more possible answers (squares to click on) only the first click on each button is recorded as an answer. Hence you must click on the reset button below the question before you can change the original answer(s). Failure to do this will probably make the answers on this question regarded as wrong in the grading process.
Please observe that your teacher may require a deeper understanding of the treated subject than reflected by this test. In case you have any valuable comments or questions regarding this self-test, explain them in an e-mail to: jol@nc.chalmers.se

Question # 1 (One answer) The rest mass of an electron is

    A) 0.000549 u
    B) 0.0055 u
    C) 0.056 u
    D) 9.351 keV
    E) 1.022 MeV

Question # 2 (One answer) The unit for atomic masses (1 u) is defined as

    A) 1/10 of the mass of the international standard atom in Paris
    B) the mass of the hydrogen isotope 1H
    C) 1/16 of the mass of the oxygen isotope 16O
    D) 1/12 of the mass of a carbon atom
    E) 1/12 of the mass of the carbon isotope 12C

Question # 3 (One or more correct answers) The atomic nucleus is made up of one or more of the elementary particles in the list below. Which one(s)?

    A) Electrons
    B) Positrons
    C) Protons
    D) Neutrinos
    E) Neutrons

In case of an error in the answers above, please click on this button before making any corrections

Question # 4 (One answer) The cost of uranium toll enrichment is usually based on the required

    A) type of separation equipment
    B) kinetic energy
    C) separative work
    D) purity of the product
    E) amount of feed

Question # 5 (One answer) 60Co and 60Ni is an example of

    A) isotones
    B) isotopes
    C) isogones
    D) isomers
    E) isobars

Question # 6 (One answer) A radioactive kind of atoms should in general be denoted as a

    A) radioisotope
    B) radionuclide
    C) radionucleon
    D) radiochron
    E) radiotope

Question # 7 (One or more correct answers) 60mCo and 60Co are a pair of

    A) isomers
    B) cobalt isotopes
    C) stable atomic nuclei
    D) radionuclides
    E) isochrones

In case of an error in the answers above, please click on this button before making any corrections

Question # 8 (One answer) By using the word nucleons one refers to

    A) atomic nuclei
    B) neutral atoms
    C) atoms without their electrons
    D) protons and neutrons
    E) nuclides with different atomic fractions

Question # 9 (One answer) Natural helium is a mixture of several helium isotopes. How many?

    A) 2
    B) 3
    C) 4
    D) 5
    E) 6

Question # 10 (One or more correct answers) Which of the following are parts of a normal mass spectrometer?

    A) An ion source
    B) Vacuum pumps
    C) A velocity selector
    D) Ion detector(s)
    E) A bending magnet

In case of an error in the answers above, please click on this button before making any corrections

Question # 11 (One answer) The crossed electric and magnetic fields in a normal velocity selector

    A) bend the beam in the same direction
    B) bend the beam in the opposite directions
    C) never bends the beam in any direction
    D) increases the velocity of the ions in the beam
    E) only permit electrons to pass

Question # 12 (One answer) The universal atomic mass unit corresponds to

    A) 1.67x10-23 kg
    B) 4.15x10-17 kg
    C) 1.00x10-28 kg
    D) 1.66x10-27 kg
    E) 9.11x10-31 kg

Question # 13 (One or more correct answers) Which of the following variables are used in the equation for calculating the mass in mass spectrometry?

    A) The ionic charge
    B) The detector sensitivity
    C) The bending radius in the magnetic field
    D) The magnetic field strength
    E) The acceleration potential used for the ions

In case of an error in the answers above, please click on this button before making any corrections

Question # 14 (One or more correct answers) Mass spectrometry can be used in

    A) activation analysis
    B) determining the products of nuclear reactions
    C) determination of molecular weights
    D) measuring isotopic ratios
    E) a measurement of the neutron rest mass

In case of an error in the answers above, please click on this button before making any corrections

Question # 15 (One answer) The mass number of a nucleus can be calculated by using the equation

    A) A = x1 * M1 + x2 * M2 + ...
    B) A = -931.5 * (MA - Z * MH - N * Mn)
    C) A = 3 * R * T / 2
    D) A = Z + N
    E) A = Z / N

Question # 16 (One answer) The mass of a nuclide given in Tables of atomic masses is its

    A) mass constant
    B) rest mass
    C) total mass at room temperature
    D) ionic mass
    E) mass number

Question # 17 (One answer) The total binding energy of all the electrons in an atom

    A) can be neglected in comparison with the mass of the nucleus
    B) varies considerably between the different isotopes of an element
    C) is always the same fraction of the atomic mass
    D) increases when the atom become lighter
    E) can be calculated from A = Z + N

Question # 18 (One or more correct answers) The isotopic fractions for an element in nature

    A) are always constant
    B) may vary with up to 5%
    C) causes considerable negative effects on our environment
    D) can in certain cases be used for determination of temperatures
    E) violates the laws of nature

In case of an error in the answers above, please click on this button before making any corrections

Question # 19 (One answer) The size of an atomic nucleus is in the range

    A) 10-5 - 10-7 m
    B) 10-8 - 10-10 m
    C) 10-11 - 10-12 m
    D) 10-13 - 10-15 m
    E) 10-16 - 10-18 m

Question # 20 (One answer) A batch of enriched uranium contains 5% 235U and the rest is 238U. From this information the atomic weight of uranium in this batch can be estimated to be

    A) 235.04 u
    B) 237.90 u
    C) 238.05 u
    D) 312.77 u
    E) 473.01 u

Correct answers to each question can be obtained by clicking on the corresponding button below


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(Updated 2001-08-18)