SSC JE - Atomic Structure 1000+ MCQ [Solved] PDF Download
Thursday 9th of March 2023
1. 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
2. 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
3. Cathode rays contain a stream of
A.
B.
C.
D.
Answer : D
4. The number of neutrons present in are
A. 28
B. 39
C. 20
D. 19
Answer : C
5. The ion that is isoelectronic with CO is
A.
B.
C.
D.
Answer : A
6. The angular momentum of the moving electron is equal to
A.
B.
C.
D.
Answer : D
7. The maximum number of electrons in a sub-energy level is equal to
A.
B.
C.
D.
Answer : B
8. The atomic number of an element having the valence shell electronic configuration is
A. 35
B. 26
C. 23
D. 34
Answer : A
9. Frequency of the wave having wave number is
A.
B.
C.
D.
Answer : B
10. rays are a stream of
A. He
B. electrons
C. positron
D. neutrons
Answer : B
11. 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
12. 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
13. Bohr's concept of the orbit in an atom was contradicted by
A. de Broglie relationship
B. Uncertainty principle
C. Planck's hypothesis
D. Hund's rule
Answer : B
14. The relationship between energy of a radiation and its frequency was given by
A. Planck
B. Rutherford
C. Einstein
D. Joule
Answer : C
15. 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
16. Mass of positron is the same to that of
A. proton
B. meson
C. electron
D. neutron
Answer : C
17. Which of the following atoms has a non-spherical outermost orbital.
A. H
B. Li
C. Be
D. B
Answer : D
18. The charge on an atom of is
A. +40
B. +27
C. +14
D. Zero
Answer : D
19. The exchange of particles considered responsible for keeping the nucleons together are
A. meson
B. electron
C. positron
D. neutron
Answer : A
20. The size of nucleus is
A.
B.
C.
D.
Answer : C
21. The number of neutrons in the deuterium atom is
A. 16
B. 3
C. 1
D. 0
Answer : C
22. 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
23. Among the following ions, which are has the highest paramagnetism?
A.
B.
C.
D.
Answer : B
24. 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
25. The fundamental particle that has least mass is
A. meson
B. alpha-particle
C. electron
D. neutron
Answer : D
26. The number of unpaired electrons in a chromic ion (atomic number 24) is
A. 6
B. 4
C. 3
D. 1
Answer : C
27. Which elements is represented by the following electronic configuration?
A. Nitrogen
B. Oxygen
C. Fluorine
D. Neon
Answer : C
28. The corect set of quantum numbers for the impaired electron of fluorine atom is A. B. C. D. Answer : B
29. 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
30. 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
31. 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
32. The orbitals with maximum number of possible orientation is:
A. s
B. d
C. f
D. p
Answer : C
33. The number of unpaired electrons in the ground state of chromium is
A. 1
B. 6
C. 7
D. 2
Answer : B
34. The wavelength of an electron moving with a velocity
A.
B.
C.
D.
Answer : D
35. Charge on fundamental particle neutrino is
A. 0
B. +1
C. -1
D. None of these
Answer : A
36. Argon is isoelectronic with
A.
B.
C.
D.
Answer : B
37. For a given energy level the number of orbitals is equal to
A.
B.
C.
D.
Answer : A
38. The number of unpaired electrons in fluorine atoms is/are
A. 4
B. 2
C. 1
D. 0
Answer : C
39. Which of the following has the highest mass?
A. Neutron
B. Alpha particle
C. Electron
D. Deuterium
Answer : B
40. 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
41. 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
42. 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
43. Isotones have same
A. mass number
B. nuclear mass
C. no. of neutrons
D. no. of electrons
Answer : C
44. 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
45. The interrelationship between matter and energy was given by
A. Rutherford
B. Joule
C. de Broglie
D. Einstein
Answer : D
46. The correct set of quantum numbers for the impaired electron of fluorine atom is A. B. C. D. Answer : B
47. Isotopes have different
A. arrangement of electrons
B. no. of P and e'
C. no. of neutrons
D. no. of electrons
Answer : C
48. Wave number is defined as
A.
B.
C.
D.
Answer : D
49. Charge on an electron was shown by
A. J. J. Thomson
B. Kirchoff
C. Ohm
D. M.Planck
Answer : A
50. 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