Full Marks: 35 Time: 70 mins
Multiple-Choice Questions (MCQs):
1. Who discovered the nucleus of an atom?
a) J.J. Thomson
b) John Dalton
c) Ernest Rutherford
d) Niels Bohr
2. Which subatomic particle determines the identity of an element?
a) Proton
b) Electron
c) Neutron
d) All of the above
3. Which scientist proposed the nuclear model of the atom?
a) Niels Bohr
b) James Chadwick
c) Ernest Rutherford
d) John Dalton
4. The maximum number of electrons that can be held in the third energy level is:
a) 2 b) 32 c) 8 d) 18
5. Which of the following is not an isotope of hydrogen?
a) Protium
b) Deuterium
c) Titrium
d) Hydrogen-4
6. Who discovered the electron?
a) Rutherford
b) Bohr
c) Thomson
d) Chadwick
7. The nucleus does not contain-
a) Electrons
b) Neutrons
c) Mesons
d) Protons
8. The electron configuration of sodium (Na) is:
a) 1s² 2s² 2p⁶ 3s¹
b) 1s² 2s² 2p⁶
c) 1s² 2s² 2p⁶ 3s²
d) 1s² 2s² 2p⁴
9. Which type of radiation is composed of helium nucleus?
a) Alpha radiation
b) Beta radiation
c) Gamma radiation
d) X-ray radiation
10. The number of orbitals in the p-subshell is:
a) 1 b) 3 c) 5 d) 7
