1. ‘Atomic theory’ of matter was given by
2. Atomic size is of the order of—
(A) 10–8 cm
(B) 10–10 cm
(C) 10–13 cm
(D) 10–6 cm
3. The fundamental particles that composed on atom are –
(A) Proton, electron, meson
(B) Proton, electron, photon
(C) Proton, electron, neutron
(D) Proton, electron, deuteron
4. The size of the nucleus is measured in:
5. The radius of an atomic nucleus is of the order of—
(A) 10–10 cm
(B) 10–13 cm
(C) 10–15 cm
(D) 10–8 cm
6. Nucleus of an atom consists of.
(C) Proton and Neutron
(D) Electron, Proton and Neutron
7. Which of the following is not a nucleon?
8. According to Rutherford’s atomic model, the electron inside an atom are–
(D) None of these
9. Rutherford’s -scattering experiment related to the size of the—
10. Discovery of the nucleus of an atom was due to the experiment carried out by—
11. The atomic number of carbon is 6 and its atomic mass is 12. How many are there protons in the
nucleus of carbon?
12. When Helium atom loses electron, then it becomes–
(B) Positive Helium ion
(C) Negative Helium ion
(D) Alpha Particle
13. Which of the following particle is negatively charged ?
14. The absolute value of charge on electron was determined by—
(A) J.J. Thomson
(B) R.A. Millikan
15. Electrons move around the nucleus in
16. An atom has 2 electorns in K-shell, 8 electrons in L-shell and 6 electrons in M – shell. The number of s – electrons present in that element is –
17. The proton is heavier than an electron by
(A) 187 times
(B) 1837 times
(C) 3837 times
(D) 2827 times
18. CN– ion is isoelectronic with –
(C) both a & b
19. Which of the following is the maximum number of electrons that can be present in M-shell?
20. Which among the following will be a negative ion ?
(A) If it has more electrons than protons
(B) If it has more electrons than neutrons
(C) If it has more protons than electrons
(D) If it has more protons than neutrons
21. Electrons in the highest energy level of an atom are called ________.
(A) Valence protons
(B) Orbital protons
(C) Valence electrons
(D) Orbital electrons
22. Fe has 26 protons in its nucleus. What are the number of electrons in Fe2+ (II) ion?
(A) 24 (B) 26
(C) 28 (D) 13
23. Number of p-electrons in bromine atom:
24. Which of the following has maximum Mass?
(D) Nucleus of Hydrogen
25. The mass of proton and mass of _____ is same.
(D) Alpha particle
26. The nuclear particle having no mass and no charge, but only spin is
27. Who is awarded by Nob le prize for the discovery of Neutron?
(C) Neil Bohr
28. The electronic configuration of a dipositive ion M²+ is 2, 8, 14 and its atomic mass is 56. The
number of neutrons in the nucleus would be:
(A) 30 (B) 32
(C) 34 (D) 42
29. The triad of nuclei is isotone in :
(A) 6C14 , 7N15, 9F17
(B) 6C12 , 7N14 , 9F18
(C) 6C14 , 7N14 , 9F17
(D) 6C14 , 7N14 , 9F19
30. The unrelated member of the following group is
(A) Helium ion
31. The antiparticle of an electron is
(C) Alpha particle
(D) Beta particle
32. Which two basic forces are able to provide an attractive force between two neutrons?
(A) Gravitational and Electrostatic forces
(B) Some other forces
(C) Gravitational and Nuclear forces
(D) Electrostatic and Nuclear forces