1. Who of the following scientists made the most significant contribution to the creation of quantum mechanics?

a) Isaac Newton and Robert Boyle
b) Rudolf Hertz and Emanuel Boltzmann
c) John Houston and Max von Klapke
d) Erwin Schroedinger and Werner Heisenberg

2. What (among other things) was explained by quantum mechanics?

a) The way the sun produces energy.
b) The distribution of spectral lines of different atoms.
c) The radioactive decay of the atomic nucleus.
d) The relativity theory.

3. Who discovered the indeterminacy principle?

a) Werner Heisenberg.
b) Erwin Schroedinger.
c) Louise de Broglie.
d) Max Planck.

4. Let's imagine more and more precise measuring of the position of an electron. In such situation...

a) ... the momentum of that electron can be measured more and more precisely.
b) ... the electron emits photons at random directions.
c) ... the electron moves faster and faster.
d) ... the measurements of its momentum become less and less precise.

5. What amount of energy has an electron in its ground state in hydrogen atom?

a) About 1,69 eV.
b) About 13,6 eV.
c) About -13,6 eV.
d) About 1,69 eV.

6. Which quantum number describes the shape of an orbit?

a) The azimuthal quantum number.
b) The main quantum number.
c) The shape quantum number.
d) The partial quantum number.

7. What does the spin quantum number describe in the atom?

a) The size of an orbit of an electron.
b) The mass of an electron.
c) The electron rotation on its own axis.
d) The shape of an orbit of an electron.

8. Which of the following quantum numbers one needs to know to say all about an electron rotating around the nucleus?

a) The main and the azimuthal quantum numbers.
b) The spin and the azimuthal quantum numbers.
c) The magnetic and the spin quantum numbers.
d) All the four quantum numbers.

9. Can there be electrons of the same all four quantum numbers (n, l, ml, ms) in one atom?

a) Yes, but not more than two.
b) No, there can't be.
c) Yes, an unlimited number.
d) That depends on the kind of atom.

10. What amount of energy must be transferred to an electron in a hydrogen atom that is in its ground state to ionise that atom?

a) About 13,6 eV.
b) About -13,6 eV.
c) Exactly 11 eV.
d) Exactly -11 eV.

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