Nuclear Science GK Questions with Answers

GK Practice Test: Question Set - 02

1. Which of the following is used as a moderator in nuclear reactor?
    (A) Thorium
    (B) Graphite
    (C) Radium
    (D) Ordinary water

2. Atoms are composed of
    (A) Electrons and protons
    (B) Electrons only
    (C) Protons only
    (D) Electrons and nuclei

3. The wavelength of X-rays is of the order of
    (A) 10 micron
    (B) 1 angstrom
    (C) 1 cm
    (D) 1 m

4. Mesons are found in
    (A) Laser beam
    (B) X-rays
    (C) Gamma rays
    (D) Cosmic rays

5. Which radioactive pollutant has recently drawn to public, due to its occurrence in the building material?
    (A) Thorium
    (B) Radium
    (C) Plutonium
    (D) Radon

6. What is the wavelength of visible spectrum?
    (A) 8500 - 9800 angstrom
    (B) 7800 - 8000 angstrom
    (C) 3900 - 7600 angstrom
    (D) 1300 - 3000 angstrom

7. The isotope of uranium capable of sustaining chain reaction is
    (A) U-235
    (B) U-245
    (C) U-239
    (D) U-238

8. In an atomic nucleus, neutrons and protons are held together by
    (A) Gravitational forces
    (B) Exchange forces
    (C) Coulombic forces
    (D) Magnetic forces

9. Atoms of an element differ from those of all other elements in
    (A) Atomic number and electronic configuration
    (B) Number of neutrons and number of valence electrons
    (C) Atomic number and number of valence electrons
    (D) Number of neutrons and electronic configuration

10. Which of the following rays are more penetrating?
    (A) Beta rays
    (B) Alpha rays
    (C) Gamma rays
    (D) X-rays

11. According to Avogadro's Hypothesis, the smallest particle of an element or a compound, that can exist independently, is called _________.
    (A) A molecule
    (B) A cation
    (C) An anion
    (D) An atom

12. The dark lines in the solar spectrum are due to
    (A) Absorption of corresponding wavelengths by the outer layers of the sun
    (B) Destructive interference between waves of certain definite wavelengths
    (C) Absorption of corresponding wavelengths by the prism used in the photograph
    (D) Absence of corresponding wavelengths from the light emitted by the core of the sun

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Nuclear Science GK:     Set 01     Set 02
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