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1. Which one of the following statements applies to atoms which are isotopes of the same element?
A. The number of electrons outside the nucleus is the same.
B. The mass numbers are the same.
C. The sum of the number of electrons and neutrons is the same.
D. The sum of the number of protons and neutrons is the same.
2. An atom of the most common isotope of platinum, has the following combination of protons, neutrons, and electrons.
A. 78, 116, 78
B. 194, 78, 78
C. 78, 116, 78
D. 78, 194, 78
4. The atoms of different isotopes of same element differ from each other in the number of
A. Protons
B. Neutrons
C. Electrons in the inner shell only
D. Electrons in outer most shell only
5. Which statement is correct?
A. protons, neutrons and electrons together uniformly occupy the total volume of the atom
B. Neutrons and protons together have the least mass
C. Electrons occupy most of the space and contributes very little to the mass of the atom.
D. Electrons and protons have most of the mass and occupy very little space.
6. The radius of the nucleus of an atom is approximately:
A. 10-15 m
B. 1 nm
C. 10-10 m
D. 10-12 m
9. Thomson's plum pudding model explained:
A. Existence of protons
B. Electrical neutrality of an atom
C. Existence of electrons
D. Electrons move in fixed circular orbits
10. In which pair is the two species Isoelectronic?
A. As, P
B. O, F
C. Fe2+, Fe3+
D. O, N-
11. Which pair of species has the same number of electrons?
A. Fe, Mn+
B. Ar, K+
C. Te, Se
D. Mn, Tc
12. The smallest particle of an element which can take part in chemical reactions and may or may not exist independently is the
A. Nucleus
B. Compound
C. Atom
D. Neutron
13. The charge on electron was determined by
A. Crooks
B. Bohr
C. Milliken
D. Schrodinger
14. The ratio of e/m for cathode rays
A. Varies with gas in discharge tube
B. Is maximum when hydrogen is taken
C. Is fixed
D. Varies with different electrode
15. The three fundamental particles of the atom are
A. Mesons, Quarks and Anti-neutrino
B. Positron, Neutrino and Gamma Rays
C. Nucleus, Anti-quarks and Electrons
D. Proton, Neutron and Electron
16. A subshell with n = 6, = 2 can accomodate a maximum of
A. 10 electrons
B. 72 electrons
C. 12 electrons
D. 36 electrons
18. The radius of an atom is approximately :
A. 10-12 cm
B. 1 nm
C. 1cm
D. 10-10 m
19. The nucleus of a tritium atom, 3H, contains
A. three protons
B. three neutrons
C. two protons and one neutron
D. two neutrons and one proton
20. Which of the following is true about electron:
A. It is negatively charged and is lighter than a proton.
B. It is negatively charged and has same mass as a proton.
C. It is positively charged and has no mass
D. None of the above
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