Atomic Structure – Old Year Questions

1. Who is regarded as the Father of Modern Chemistry?

(a) Rutherford
(b) Einstein
(c) Lavoisier
(d) C.V. Raman
(e) None of the above/More than one of the above

[65th B.P.S.C. (Pre) 2019]


2. The positively charged part at the centre of an atom is called as :

(a) Proton
(b) Neutron
(c) Electron
(d) Nucleus
(e) None of the above/More than one of the above

[63rd B.P.S.C. (Pre) 2017]


3. Constituents of the atomic nucleus are –

(a) Electron and proton
(b) Electron and neutron
(c) Proton and neutron
(d) Proton, neutron and electron

[U.P. P.C.S. (Pre) 1996, 41st B.P.S.C. (Pre) 1996, 43rd B.P.S.C. (Pre) 1999]


4. Which of the following statements about molecular structure is correct :

(a) Neutron and electron are found inside the nucleus and protons revolves around the nucleus.
(b) Electrons and protons are inside the nucleus and neutrons revolve around the nucleus.
(c) Proton and neutrons are inside the nucleus and electrons revolve around the nucleus.
(d) Proton, neutron and electron all are inside the nucleus.

[R.A.S./R.T.S. (Pre) 1992]


5. Which of the following is not a part of an atom?

(a) Electron
(b) Proton
(c) Neutron
(d) Photon

[M.P.P.C.S. (Pre) 2005]


6. A single type of atom is found in –

(a) Compounds of minerals
(b) Mixture of minerals
(c) Native elements
(d) None of the above

[53rd to 55th B.P.S.C. (Pre) 2011]


7. The atomic nucleus was discovered by :

(a) Rutherford
(b) Dalton
(c) Einstein
(d) Thompson

[R.A.S./R.T.S.(Pre) 2003]


8. In an atom, neutron was discovered by :

(a) J.J. Thomson
(b) Chadwick
(c) Rutherford
(d) Newton

[Jharkhand P.C.S. (Pre) 2003, U.P.P.C.S. (Pre) 1996, U.P.P.C.S. (Pre) 1995]


9. Which of the following is not a sub-atomic particle?

(a) Neutron
(b) Proton
(c) Deuteron
(d) Electron

[U.P.P.C.S. (Pre) 2007]


10. Which one of the following pairs constitutes a particle-antiparticle pair?

(a) Electron – Positron
(b) Proton – Neutron
(c) Photon – Electron
(d) Neutron – Neutrino

[U.P.P.C.S. (Mains) 2005]


11. Match List-I with List-II and select the correct answer using the codes given below the lists :
List-I (Characteristic)            List-II (Particle)
A. Zero mass                                1. Positron
B. Fractional charge                 2. Neutrino
C. Fractional spin                      3. Quark
D. Integral spin                          4. Phonon
Code :


(a) 2 3 1 4
(b) 3 2 4 1
(c) 2 3 4 1
(d) 3 2 1 4

[I.A.S. (Pre) 2001]


12. Which one is a fundamental particle?

(a) Neutron
(b) Proton
(c) S-meson
(d) Quark

[U.P. R.O./A.R.O. (Mains) 2017]


13. Higgs Boson is also known as :

(a) Electron
(b) Proton
(c) Neutrons
(d) God Particles

[Jharkhand P.C.S. (Pre) 2021]


14. Much discussed ‘God Particle’ is :

(a) Neutrino
(b) Leptons
(c) Higgs boson
(d) Mesons

[U.P. U.D.A./L.D.A. (Pre) 2013]


15. ‘God particle is :

(a) Neutrino
(b) Higgs Boson
(c) Meson
(d) Positron
(e) None of the above/More than one of the above

[60th to 62nd B.P.S.C. (Pre) 2016]


16. The efforts to detect the existence of Higgs boson particles have become frequent news in the recent past. What is/are the importance of discovering this particle?
1. It will help us to understand why elementary particles have mass.
2. It will enable us in the near future to develop the technology to transfer matter from one point to another without traversing the physical space between them.
3. It will enable us to create better fuel for nuclear fission.
Select the correct answer using the codes given below:

(a) only 1
(b) only 2 and 3
(c) only 1 and 3
(d) only 1, 2 and 3

[I.A.S. (Pre) 2013]


17. Which particle is free of charge?

(a) α-particle
(b) Electron
(c) Neutron
(d) Proton
(e) None of the above/More than one of the above

[66th B.P.S.C. (Pre) (Re. Exam) 2020]


18. Which of the following particles has zero charge?

(a) Positron
(b) Neutrino
(c) Electron
(d) α-particle

[U.P. P.C.S. (Pre) 2021]


19. The alpha particle carries two positive charges. Its mass is very nearly equal to that of –

(a) Two protons
(b) Nucleus of an atom of helium
(c) Sum of masses of two positrons and two neutrons
(d) Two positrons, as each positron carries a single positive charge

[I.A.S. (Pre) 1996]


20. The Nucleus of Helium has –

(a) Only one neutron
(b) Two protons
(c) Two protons and two neutrons
(d) One proton and two neutrons

[R.A.S./R.T.S. (Pre) 1996]


21. Which of the following elements does not contain neutrons?

(a) Oxygen
(b) Nitrogen
(c) Hydrogen
(e) Copper
(d) None of the above/More than one of the above

[64th B.P.S.C. (Pre) 2018]


22. Which of the following carries a negative charge?

(a) X-rays
(b) Alpha particles
(c) Beta particles
(d) Gamma rays

[45th B.P.S.C. (Pre) 2002]


23. In an atom, the order of filling up of the orbitals is governed by –

(a) Aufbau’s principle
(b) Heisenberg’s uncertainty principle
(c) Hund’s rule
(d) Pauli’s exclusion principle

[I.A.S. (Pre) 2001]


24. Regarding the atom of a chemical element, the magnetic quantum number refers to –

(a) Orientation
(b) Shape
(c) Size
(d) Spin

[I.A.S. (Pre) 2003]


25. The number of electrons and neutrons in an element is 18 and 20 respectively. Its mass number is

(a) 22
(b) 2
(c) 38
(d) 20
(e) None of the above/More than one of the above

[65th B.P.S.C. (Pre) 2019]


26. What is the mass number of an element, the atom of which contains two protons, two neutrons and two electrons?

(a) 2
(b) 4
(c) 6
(d) 8

[43rd B.P.S.C. (Pre) 1999]


27. The number of neutrons in the nucleus of plutonium nuclide (94Pu242) is :

(a) 94
(b) 148
(c) 242
(d) 336
(e) None of the above / More than one of the above

[66th B.P.S.C. (Pre) 2020]


28. The atoms, in which the number of protons is the same but the number of neutrons is different, is known as –

(a) Isobars
(b) Isomers
(c) Isotones
(d) Isotopes

[U.P.P.C.S. (Mains) 2009, Chhattisgarh P.C.S. (Pre) 2005, Uttarakhand U.D.A./L.D.A. (Pre) 2003]


29. Isotopes are those atoms of the same element which have–

(a) Atomic mass is same but atomic number is different
(b) Atomic mass is different but atomic number is same
(c) Atomic number and atoms mass both are same
(d) None of the above.

[U.P. U.D.A./L.D.A. (Pre) 2001]


30. Isotopes is that nucleus of atomic nuclei in which –

(a) Number of neutrons is same but number of protons is different
(b) Number of protons is same but number of neutrons is different
(c) Number of both protons and neutrons is same
(d) Number of both protons and neutrons is different

[41st B.P.S.C. (Pre) 1996]


31. The neutronic group, in the following, is :

(a) 6 C12, 7 N14, 8 O16
(b) 6 C12, 7 N14, 8 N18
(c) 6 C14, 7 N14, 8 O16
(d) 6 C14, 7 N15, 8 O16

[R.A.S./R.T.S. (Pre) 1999]


32. Radioactivity is measured by –

(a) Hydrometer
(b) Geiger Counter
(c) Seismometer
(d) Ammeter

[U.P.P.S.C. (GIC) 2010]


33. Radioactivity was discovered by :

(a) Rutherford
(b) Becquerel
(c) Bohr
(d) Madam Curie

[U.P.P.C.S. (Mains) 2003]