Physics GK 23 - Atomic and Nuclear Physics Basics

1. Which of the following is equivalent to 1 a.m.u?
[A] 1/12th of the mass of the helium atom
[B] 1/12th of the mass of the hydrogen atom
[C] 1/12th of the mass of the oxygen atom
[D] 1/12th of the mass of the carbon atom

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2. What of following is equivalent to 1 a.m.u?
[A] 1.660539 x 10-18 kg
[B] 1.660539 x 10-21 kg
[C] 1.660539 x 10-24 kg
[D] 1.660539 x 10-27 kg

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3. Which of the following element has an isotope named as Tritium?
[A] Helium
[B] Carbon
[C] Titanium
[D] Hydrogen

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4. What do we call the atomic species of the same element differing in mass?
[A] Isobars
[B] Isotopes
[C] Isomers
[D] Such species don’t exist

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5. Which of the following gives us the mass number of an atom?
[A] total number of electrons
[B] total number of neutrons
[C] total number of nucleons
[D] None of the above

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6. What do we call the nuclides having same mass number?
[A] Isotopes
[B] Isobars
[C] Isotones
[D] Such species don’t exist

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7. What is Mass defect of a nucleus?
[A] difference between mass of a nucleus and its constituents
[B] sum of the mass of a nucleus and its constituents
[C] difference between mass of a neutron and mass of proton
[D] sum of mass of a neutron and mass of proton

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8. Which of the following is correct?
[A] The nuclear force does not depend on the electric charge
[B] The nuclear force is much weaker than the Coulomb force
[C] Both a and b
[D] None of the above

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9. Which of the following is the name given to electrons moving at high speed?
[A] Alpha particles
[B] Beta particles
[C] Gamma particles
[D] None

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10. Which of the following is a limitation of Bohr’s model of atom?
[A] it does not explain why orbits of electrons are taken as circular
[B] it does not take into account the wave nature of electrons
[C] Both a and b
[D] None

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