CBSE Class 12 Physics Atoms Quiz 1

1. An atom stays in an excited state for about:

A 10 micro seconds B 10 milli seconds C 10 nano seconds D 10 seconds

2. The energy equivalent to one atomic mass unit is :

A 1.6 × 10^-19 J B 6.02 × 10²³ J C 9.31 MeV D 931 MeV

3. Who explained the splitting of special lines in magnetic field?

A Zeeman B Bohr C Summerfield D Einstein

4. The mass of a neutron is:

A 1.00866 u B 1.0866 u C 1.866 u D 0.1866 u

5. Isobars have the same:

A A B Z C N D All the above

6. Isotones have the same:

A A B Z C N D All the above

7. Half-life of a substance depends on:

A pressure B temperature C density D None of these

8. The concept of electron spin was introduced by:

A Becquerel B Goudsmit C Millikan D Uhlenbeek and Goudsmit

9. The principle that a quantum orbital cannot be occupied by more than two electrons was given by:

A Pauli B Millikan C Hund D None of these

10. For ionization of excited Hydrogen atom, the, required energy is:

A a little less than 13.6 B equal to 13.6 C more than 13.6 D 3.4 or less