CBSE Class 12 Physics Atoms Quiz 2

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CBSE › Class 12 › Physics › Atoms

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1. According to Bohr's theory of hydrogen atom, the radius r of stationary orbit are related to principal quantum number n as:

A r_g ∝ \(\frac{1}{n^2}\) B r_g ∝ \(\frac{1}{n}\) C r_g ∝ n D r_g ∝ n²

2. F_g and F_e represents the gravitational and electrostatic force respectively between two electrons situated at some distance the ratio \(\frac{F_g}{F_e}\) is if the order of:

A 9.8 B 10⁹ C 10⁴² D 10^-42

3. Artificial radioactivity was discovered by:

A Joliot B Becquerel C Pauli D None of these

4. P-decay produces:

A isobars B isotopes C isotones D All the above

5. Natural radioactivity was discovered by:

A Joliot B Becquerel C Pauli D None of these

6. Transmutation of nuclei was discovered by:

A Rutherford B Becquerel C Pauli D None of these

7. The energy equivalent to mass defect is called :

A binding energy B internal energy C external energy D enthalpy

8. The total energy that will be released if a nucleus is built from its constituents is called the:

A binding energy of the nucleus B binding energy of the solid C binding energy of the atom D None of these

9. The binding energy of \(_{2}^{4}\)He is about:

A 28.3 eV B 28.3 MeV C 28.3 J D 2.83 MeV

10. The binding energy of a deuteron is about:

A 2.22 MeV B 2.22 J C 2.22 eV D None of these

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