1000+ Atomic Structure MCQ for XAT [Solved]
Thursday 9th of March 2023
1. The wavelength of an electron moving with a velocity
A.
B.
C.
D.
Answer : D
2. Isotopes have different
A. arrangement of electrons
B. no. of P and e'
C. no. of neutrons
D. no. of electrons
Answer : C
3. The number of unpaired electrons in fluorine atoms is/are
A. 4
B. 2
C. 1
D. 0
Answer : C
4. The ion that is isoelectronic with CO is
A.
B.
C.
D.
Answer : A
5. The size of nucleus is
A.
B.
C.
D.
Answer : C
6. The charge on an atom of is
A. +40
B. +27
C. +14
D. Zero
Answer : D
7. The exchange of particles considered responsible for keeping the nucleons together are
A. meson
B. electron
C. positron
D. neutron
Answer : A
8. Among the following ions, which are has the highest paramagnetism?
A.
B.
C.
D.
Answer : B
9. If value of h is taken as , the de-Broglie wavelength of a particle of mass having velocity is
A. 0.01 m
B. 2 nm
C. 0.1 nm
D.
Answer : C
10. In the nucleus of there are
A. 40 protons and 20 electrons
B. 20 protons and 40 electrons
C. 20 protons and 40 neutrons
D. 20 protons and 20 neutrons
Answer : D
11. The number of unpaired electrons in the ground state of chromium is
A. 1
B. 6
C. 7
D. 2
Answer : B
12. The relationship between energy of a radiation and its frequency was given by
A. Planck
B. Rutherford
C. Einstein
D. Joule
Answer : C
13. The maximum number of electrons that can be accommodated by an atom in g-sub-energy level are
A. 20
B. 25
C. 18
D. 12
Answer : C
14. The number of unpaired electrons in a chromic ion (atomic number 24) is
A. 6
B. 4
C. 3
D. 1
Answer : C
15. The maximum number of electrons in a sub-energy level is equal to
A.
B.
C.
D.
Answer : B
16. The wavelength of an electron
A. is equal to that of light
B. remains constant with velocity
C. decreases with an increasing velocity
D. increases with an decreasing velocity
Answer : C
17. The atomic number of an element having the valence shell electronic configuration is
A. 35
B. 26
C. 23
D. 34
Answer : A
18. In Lyman series an electron jumps from higher energy level to
A. K energy level
B. M energy level
C. N energy level
D. L energy level
Answer : A
19. A dipositive ion has in the K shell, 8 e~ s in the L shell and in the M shell. Atomic number of Z is
A. 19
B. 20
C. 16
D. 15
Answer : B
20. The atomic structure of an atom of an element is Is . The element is
A. Cl-35
B. S-32
C. N-18
D. O-16
Answer : A
21. Cathode rays contain a stream of
A.
B.
C.
D.
Answer : D
22. The velocity of a photon is
A. dependent on its wavelength
B. dependent on its source
C. equal to cube of its amplitude
D. independent of its wavelength
Answer : D
23. Frequency of the wave having wave number is
A.
B.
C.
D.
Answer : B
24. Mass of positron is the same to that of
A. proton
B. meson
C. electron
D. neutron
Answer : C
25. Wave number is defined as
A.
B.
C.
D.
Answer : D
26. In an atom of hydrogen, which of the following orbitais has the lowest energy for an electron present in it?
A. 3r
B. 2p
C. 4p
D. 2s
Answer : B
27. Which of the following atoms has a non-spherical outermost orbital.
A. H
B. Li
C. Be
D. B
Answer : D
28. Electronic configuration of is
A.
B.
C.
D.
Answer : B
29. For a given energy level the number of orbitals is equal to
A.
B.
C.
D.
Answer : A
30. Which elements is represented by the following electronic configuration?
A. Nitrogen
B. Oxygen
C. Fluorine
D. Neon
Answer : C
31. The interrelationship between matter and energy was given by
A. Rutherford
B. Joule
C. de Broglie
D. Einstein
Answer : D
32. No two electrons in an atom can have the same values of all four quantum numbers according to
A. Hund's rules
B. Flemming rule
C. Pauli's exclusion principle
D. Bohr theory
Answer : C
33. The corect set of quantum numbers for the impaired electron of fluorine atom is A. B. C. D. Answer : B
34. Charge on an electron was shown by
A. J. J. Thomson
B. Kirchoff
C. Ohm
D. M.Planck
Answer : A
35. rays are a stream of
A. He
B. electrons
C. positron
D. neutrons
Answer : B
36. The correct set of quantum numbers for the impaired electron of fluorine atom is A. B. C. D. Answer : B
37. The possible values of l for an s orbital are
A. -1, +1
B. 0 to 2
C. -2 and + 1
D. 0
Answer : D
38. Argon is isoelectronic with
A.
B.
C.
D.
Answer : B
39. When the electron is excited from K level to M level we get
A. - rays
B. cathode rays
C. continuous spectra
D. absorption spectra
Answer : D
40. Which of the following weighs the least?
A. 1 g of
B. 2 litres of at N.T.P.
C. molecules of
D. atoms of carbon
Answer : A
41. Isotones have same
A. mass number
B. nuclear mass
C. no. of neutrons
D. no. of electrons
Answer : C
42. The number of neutrons present in are
A. 28
B. 39
C. 20
D. 19
Answer : C
43. The number of neutrons in the deuterium atom is
A. 16
B. 3
C. 1
D. 0
Answer : C
44. Which of the following has the highest mass?
A. Neutron
B. Alpha particle
C. Electron
D. Deuterium
Answer : B
45. The angular momentum of the moving electron is equal to
A.
B.
C.
D.
Answer : D
46. The orbitals with maximum number of possible orientation is:
A. s
B. d
C. f
D. p
Answer : C
47. Davisson and Germer gave an experimental evidence for
A. wave nature of electron
B. particle nature of electron
C. particle nature of light
D. wave nature of light
Answer : D
48. In the case of atomic spectrum of hydrogen which series of lines lie in the visible region?
A. Balmer
B. Paschen
C. Pfund
D. None of these
Answer : B
49. The fundamental particle that has least mass is
A. meson
B. alpha-particle
C. electron
D. neutron
Answer : D
50. Charge on fundamental particle neutrino is
A. 0
B. +1
C. -1
D. None of these
Answer : A