1. _________quantum number describes how far away from the nucleus an electron is ……….

a) Principal b) azimuthal c) magnetic d) spin

2. What property of an element determines its chemical properties
a) Size of an element b) electrons c) The molar mass of the element
d) not any
3. Who gave the concept of fixed energy levels around the nucleus
a) Ernest Rutherford b) Neils Bohr c) J.J.Thomson d) schrodinger
4. Pick the invalid sets of quantum numbers
a) n=5, l=2, m=0, s=½ b) n=1, l=2, m=0, s=½ c) n=5, l=3, m=2, s=½
d) n=5, l=2, m=0, s=-½
5. How many electrons can exist with the principal quantum number’s value of 4
a) 6 b) 4 c) 32 d) 12 e) 10
6. Which element has 13 electrons in its M-shell is –
a) Nickel b) Copper c) Iron d) Chromium
7. Which is not true for x-rays
a) Affect ZnS film b) ionize gases c) have less energy than gamma rays d)
deflected by magnetic field
8. Which has the highest e/m value
a) Neutron b) proton c) alpha rays d) electron
9. Pick the correct set of n ,l , m , s quantum numbers for unpaired electron of chlorine
a) n=3, l=1, m=1, s=½ b) n=3, l=2, m=1, s=½ c) n=3, l=3, m=1, s=½ d) n=3,
l=0, m=1, s=½
10. Electromagnetic radiation with longest wavelength is
a) Gamma rays b) x-rays c) visible rays d) infra red
11. Which has the lowest e/m value
a) Neutron b) proton c) alpha rays d) electron
12. Which of the following has large radius of first orbit
a) Hydrogen b) He+1 c) Li+2 d) Be+3
13. Orbitals arrangement around nucleus is given by
a) Priciple quantum number b) azimuthal quantum number c) magnetic quantum number
d) spin quantum number
14. Number of unpaired electrons for electronic configuration 1s2 2s2 2p3
a) 2 b) 3 c) 1 d) 5
15. The minimum difference of energy between shells of H – atom is for
a) n = 2 and n = 3 b) n = 4 and n = 5 c) n = 4 and n =6 d) n = 6
and n = 7
16. Number of unpaired electrons for nitride ion P −3 are
a) 3 b) 6 c) 0 d) 1
17. Value of Magnetic quantum number for valence shell of potassium is
a) 1 b) 0 c) 5 d) 3
18. n + l value of 3f orbitals is
a) 8 b) 7 c) 6 d) not possible
19. Which is incorrect for line spectrum
 a) Produced by sun light b) has specific lines c) finger print for identity of
atoms d) all
20. Select the wrong statement
a) n = 2 , l = 1 , m = 0 , s = +1/2 b) n = 3 , l = 1 , m = 0 , s = +1/2 c) n = 2 , l = 2 , m = 0 , s
= +1/2 d) n = 3 , l = 4 , m = 1 , s = +1/2 e) a&d
21. Number of waves which pass through a point in one second is called as
a) Wave length b) frequency c) energy d) wave number
22. Electrons are added one by one to the various orbitals in order of their increasing energy starting
with the orbital of lowest energy
a) Aufbau principle b) n+l rule c) hunds rule d) pauli exclusion
principle
23. Nodal plane is absent in
a) S b) p c) d d) f
24. Quantum number values for 3s sub shell of potassium atom
a) n=4, l=0 , ms=+ 1⁄2 b) n=3, l=3 , ms=− 12 , +1/2 c) n=3, l=3 , ms=− 12 , +1/2 d) Not any
25. What is the number of electrons in a subshell if n=7 , l=0
a) 2 b) 6 c) 8 d) 10
26. Line spectrum is given by
a) Atoms b) Ionized gases c) Candle d) All
27. Spectral lines with shortest wave length in hydrogen studied by
a) Paschen b) Brackett c) Lyman d) Balmer
28. Who studied the hydrogen spectrum in IR region
a) Paschen b) Brackett c) Pfund d) All
29. .Plancks quantum theory give idea about
a) discontinues energy change by atom b) Absorption of energy c) Emission of energy d) all
30. Maximum value of e/m of electron is for
a) Uranium b) Lithium c) Hydrogen d) all have same value
31. Quantum number whose value is non-zero
a) Principle b) Magnetic c) Azimuthal d) Spin
32. What are the values quantum number for 5d
a) n=5,l=1 b) n=5 ,l=4 c) n=5, l=2 d) n=5,l=3
33. Angular momentum of moving electron in bohrs atomic model is
nh nh nh
a)mvr = 3π b) mr = 3π c) mvr = 2π d) All
34. Pick the set of isoelectronic species from the followings
a) K+, Ca+2 , Cl−, Sc+3 b) K+, Ca+2 , Cl−, Ti+4 c) K+, Mg+2 , Cl−, Sc+3 d) a&b
35.
If l=1 and n=7 what should be correct number of electrons in sub shell
a) 11 b)14 c) 10 d) 6
36. They are found in all principal energy levels
a) S-orbitals b) p-orbitals c) d-orbitals d) f-orbital
37. The principal quantum number of the first d orbital is _____
a) 3 b) 1 c) 2 d) 4
38. Orbit numbers or integers used in bohr atomic model stand for ____________ quantum number
a) Principle b) Magnetic c) Azimuthal d) Spin
39. Which orbital exist equally at all three axis
a) S-orbitals b) p-orbitals c) d-orbitals d) f-orbital
40. gamma-rays consist of
a) Electrons b) proton c) photons d) neutrons
41. As mass of sub atomic particle increases , charge of electron ____________
a) Increase b) decrease c) remain same d) not any
42. The balmer transition give
a) Line spectrum b) continuous spectrum c) VIBGYOR d) all
43. Which is the paschen series transition
a) 𝑛7 → 𝑛1 b) 𝑛4 → 𝑛3 c) 𝑛7 → 𝑛2 d) 𝑛7 → 𝑛5
44. Which orbit has the least value of energy
a) 1st b) 2nd c) 3rd d) 7th
45. Which metal anode emit x-rays of longer wave length
a) Aluminium b) iron c) zinc d) gold
rd
46. Which has the smallest radii of 3 orbit
a) H b) 𝐻𝑒 + c) 𝐿𝑖 2+ d) 𝐵𝑒 +3
−𝐾𝑍 2
47. What energy of electron in joule for 3rd of H atom ( E ) K= --2.18𝑥10 −19 J
𝑛2
a) --2.4𝑥10−19 J b) --3.4𝑥10 −19 J c) --9.4𝑥10−19 J d) --1.1𝑥10 −19 J
48. When electron of H atom is excited from ground state to first excited state its radius will be
a) Increase twice b) 4 times increase c) remain same d) become half
49. Which of the following is found in the UV region of the spectrum
a) Pfund series b) Brackett series c) Lyman series d) Paschen series
37
50. What is the number of neutrons, protons, and electrons of 17CL respectively.
a) 20, 20, 17 b) 17, 17, 20 c) 20, 17, 17 d) 17, 17, 17
51. Which metal anode emit x-rays of short wave length
b) Aluminium b) iron c) zinc d) gold
52. As atomic number increase frequency of x-rays ___________
a) Increase b) decrease c) remain same d) not any
53. Radius of 1st orbit of 𝐻𝑒 + is
a) 0.53A b) 2.12A c) 0.26A d) 0.13A
54. Electrons in p,dand f orbitals remain unpaired as far as possible
a) Humds rule b) pauli rule c) aufbau d) n+l rule
55. Which of the following atoms has three unpaired electrons
a) N b) P c) 𝑆 + d) all
56. Which of the following is iso electronic with Ca
a) Sc +3 b) Sc +2 c) Sc + d) Sc