Competitive Exams: Chemistry MCQs (Practice-Test 30 of 31)

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  1. Solve

    1. alpha particles.

    2. beta particles.

    3. gamma rays.

    4. protons.

    5. ultraviolet.

  2. Orange-colored Fiesta tableware causes a Geiger counter to emit a rapid clicking sound. The BEST explanation of this phenomenon is that the pottery:

    1. has a lead glaze.

    2. undergoes fusion.

    3. is made with uranium ores.

    4. emits neutrons.

    5. is painted with radium-based paints.

  3. Isotopes with neutron to proton ratios that are too low would be expected to undergo radioactive decay by which one of the following processes? That is, which of the following processes would result in an increase in the neutron to proton ratio?

    1. neutron emission

    2. beta particle emission

    3. alpha particle emission

    4. gamma ray emission

    5. positron emission

  4. The presence of radon-222 in homes poses a serious health risk. Radon-222 decays by alpha particle emission with a half-life of 3.8 days. Which of the following is the product nuclide from this decay?

    1. astatine-221

    2. francium-222

    3. astatine-222

    4. radon-221

    5. polonium-218

  5. Naturally occurring uranium-238 decays in a series of steps to produce the stable nuclide, lead-206. The product nuclide that results after the seventh step in this decay series is polonium-218. Which of the following series of decays would produce polonium-218 from uranium-238?

    1. 3 alpha + 4 beta

    2. 4 alpha + 3 beta

    3. 5 alpha + 2 beta

    4. 2 alpha + 5 beta

    5. 1 alpha + 6 beta

  6. Which of the following types of radiation generally has the greatest potential for biological damage?

    1. alpha particles

    2. beta particles

    3. gamma rays

    4. positrons

    5. neutrons

  7. Positron Emission Tomography (PET) is a medical diagnostic technique that is based on which one of the following processes?

    1. neutron bombardment

    2. fission

    3. annhilation

    4. fusion

    5. electron scattering

  8. An isotope of an element decays by emitting an alpha particle and forming lead-208. The original element was:

    1. Bi

    2. Hg

    3. Po

    4. Rn

    5. Tl

  9. The only stable isotope of fluorine is fluorine-19. What type of radioactivity would you expect from the isotope fluorine-18, which has one less neutron?

    1. protons

    2. neutrons

    3. beta particles

    4. positrons

    5. alpha particles

  10. The isotope with the greatest nuclear binding energy per nucleon is:

    1. hydrogen-2

    2. helium-4

    3. carbon-14

    4. iron-56

    5. uranium-238