Atomic Structure 1000+ MCQ with answer for SSC JHT

1. Which elements is represented by the following electronic configuration?

A. Nitrogen
B. Oxygen
C. Fluorine
D. Neon
Answer : C

2. The relationship between energy of a radiation and its frequency was given by
A. Planck
B. Rutherford
C. Einstein
D. Joule
Answer : C

3. Wave number is defined as
A. $\raisebox{1ex}{$3$}\!\left/ \!\raisebox{-1ex}{$\lambda $}\right.$
B. $\raisebox{1ex}{${\lambda }^2$}\!\left/ \!\raisebox{-1ex}{$n\pi $}\right.$
C. $\raisebox{1ex}{$h$}\!\left/ \!\raisebox{-1ex}{$2\pi $}\right.$
D. $\raisebox{1ex}{$1$}\!\left/ \!\raisebox{-1ex}{$\lambda $}\right.$
Answer : D

4. Which of the following atoms has a non-spherical outermost orbital.
A. H
B. Li
C. Be
D. B
Answer : D

5. Which of the following has the highest mass?
A. Neutron
B. Alpha particle
C. Electron
D. Deuterium
Answer : B

6. Isotones have same
A. mass number
B. nuclear mass
C. no. of neutrons
D. no. of electrons
Answer : C

7. The number of neutrons present in ${}_{19}{}^{39}K$ are
A. 28
B. 39
C. 20
D. 19
Answer : C

8. Charge on an electron was shown by
A. J. J. Thomson
B. Kirchoff
C. Ohm
D. M.Planck
Answer : A

9. The atomic number of an element having the valence shell electronic configuration $4s^{2}4p^6$ is
A. 35
B. 26
C. 23
D. 34
Answer : A

10. The orbitals with maximum number of possible orientation is:
A. s
B. d
C. f
D. p
Answer : C

11. The correct set of quantum numbers for the impaired electron of fluorine atom is
A.

n	l	m
2	1	0

B.

n	l	m
2	1	1

C.

n	l	m
3	1	1

D.

n	l	m
3	0	0

Answer : B

12. Among the following ions, which are has the highest paramagnetism?
A. $\left[Cr\right(H_{2}O{)}_6{]}^{+3}$
B. $\left[Fe\right(H_{2}O{)}_6{]}^{+2}$
C. $\left[Cu\right(H_{2}O{)}_6{]}^{+2}$
D. $\left[Zn\right(H_{2}O{)}_6{]}^{+2}$
Answer : B

13. Cathode rays contain a stream of
A. $n$
B. $r$
C. ${}_{+1}e^0$
D. ${}_{-1}e^0$
Answer : D

14. The ion that is isoelectronic with CO is
A. $C{N}^{-}$
B. ${O_2}^{+}$
C. ${O_2}^{-}$
D. ${N_2}^{+}$
Answer : A

15. The number of unpaired electrons in a chromic ion $C{r}^{+3}$ (atomic number 24) is
A. 6
B. 4
C. 3
D. 1
Answer : C

16. 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

17. The corect set of quantum numbers for the impaired electron of fluorine atom is
A.

n	l	m
2	1	0

B.

n	l	m
2	1	1

C.

n	l	m
3	1	1

D.

n	l	m
3	0	0

Answer : B

18. The size of nucleus is
A. ${10}^{-12} m$
B. ${10}^{-8} m$
C. ${10}^{-15} m$
D. ${10}^{-10} m$
Answer : C

19. When the electron is excited from K level to M level we get
A. $\gamma$- rays
B. cathode rays
C. continuous spectra
D. absorption spectra
Answer : D

20. The maximum number of electrons in a sub-energy level is equal to
A. $4(2l+1)$
B. $2(2l+1)$
C. $2n^2$
D. $n^3$
Answer : B

21. A dipositive ion $Z^{++}$ has $2e^{-}$ in the K shell, 8 e~ s in the L shell and $8e^{-}$ in the M shell. Atomic number of Z is
A. 19
B. 20
C. 16
D. 15
Answer : B

22. The fundamental particle that has least mass is
A. meson
B. alpha-particle
C. electron
D. neutron
Answer : D

23. $\beta$ rays are a stream of
A. He
B. electrons
C. positron
D. neutrons
Answer : B

24. 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

25. The number of unpaired electrons in the ground state of chromium is
A. 1
B. 6
C. 7
D. 2
Answer : B

26. 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

27. 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

28. The wavelength of an electron moving with a velocity $5\times {10}^{5}m se{c}^{-1} is (h=6.63 \times {10}^{-34} kg m^{2 }se{c}^{-1})$ 
A. $11.6 \times {10}^{-5}m$
B. $11.6 \times {10}^{-9}{m}^{-1}$
C. $14.6 \times {10}^{-5}m$
D. $1.46 \times {10}^{-9}m$
Answer : D

29. 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

30. The interrelationship between matter and energy was given by
A. Rutherford
B. Joule
C. de Broglie
D. Einstein
Answer : D

31. Mass of positron is the same to that of
A. proton
B. meson
C. electron
D. neutron
Answer : C

32. Charge on fundamental particle neutrino is
A. 0
B. +1
C. -1
D. None of these
Answer : A

33. Argon is isoelectronic with
A. $M{g}^{++}$
B. $C{l}^{-}$
C. $B{r}^{-}$
D. $H^{+}$
Answer : B

34. Isotopes have different
A. arrangement of electrons
B. no. of P and e'
C. no. of neutrons
D. no. of electrons
Answer : C

35. For a given energy level the number of orbitals is equal to
A. $n^2$
B. $2l+1$
C. $4(2l+3)$
D. $\sqrt{2n^3}$
Answer : A

36. The atomic structure of an atom of an element is Is $1s^2, 2s^{2}2p^6, 3s^{2}3p^6$. The element is
A. Cl-35
B. S-32
C. N-18
D. O-16
Answer : A

37. Electronic configuration of $C{u}^{+}$ is
A. $\left[Ar\right]3d^9$
B. $\left[Ar\right]3d^{10}$
C. $\left[Ar\right]3d^{9}3s^2$
D. $\left[Ar\right]3d^{7}4s^{1}4p^1$
Answer : B

38. The exchange of particles considered responsible for keeping the nucleons together are
A. meson
B. electron
C. positron
D. neutron
Answer : A

39. The angular momentum of the moving electron is equal to
A. $\sqrt{nh}$
B. $\raisebox{1ex}{$h^2$}\!\left/ \!\raisebox{-1ex}{$2\pi $}\right.$
C. $\raisebox{1ex}{$nh$}\!\left/ \!\raisebox{-1ex}{$\pi $}\right.$
D. $\raisebox{1ex}{$nh$}\!\left/ \!\raisebox{-1ex}{$2\pi $}\right.$
Answer : D

40. Frequency of the wave having wave number $20000 c{m}^{-1}$ is
A. $6\times {10}^{12} se{c}^{-1}$
B. $6\times {10}^{14} se{c}^{-1}$
C. $3\times {10}^{14}MHz$
D. $4\times {10}^{6}Hz$
Answer : B

41. The charge on an atom of ${}_{13}{}^{27}Al$ is
A. +40
B. +27
C. +14
D. Zero
Answer : D

42. In the nucleus of ${}_{20}C{a}^{40}$ 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

43. 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

44. 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

45. The number of neutrons in the deuterium atom is
A. 16
B. 3
C. 1
D. 0
Answer : C

46. 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

47. 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

48. If value of h is taken as ${10}^{-34} kg m^2 se{c}^{-1}$, the de-Broglie wavelength of a particle of mass ${10}^{-31}$ having velocity ${10}^{9}cm se{c}^{-1}$ is
A. 0.01 m
B. 2 nm
C. 0.1 nm
D. $15\AA$
Answer : C

49. Which of the following weighs the least?
A. 1 g of $C{O}_2$
B. 2 litres of $C{O}_2$ at N.T.P.
C. $3.01\times {10}^{11}$ molecules of $C{O}_2$
D. $3.01\times {10}^{22}$ atoms of carbon
Answer : A

50. The number of unpaired electrons in fluorine atoms is/are
A. 4
B. 2
C. 1
D. 0
Answer : C