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MDCAT Chemistry Atomic Structure Test Online

Malik TahirLast Updated: May 24, 2025

Chemistry Atomic MCQS Online Test

MDCAT Chemistry Atomic Chapter Online Test

Total Questions:	86
Time Allowed:	40 Minutes
Total Marks:	86
How to Attempt Test:	Please choose the right Option in MCQ-type question.
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MDCAT Chemistry Atomic Test

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Page 1 of 86

Chemistry

1. P fund series are produced in the spectrum of hydrogen atom

When electron jump to 5-orbit

When electron jump to 3-orbit

When electron jump to 2-orbit

When electron jump to 4-orbit

Page 2 of 86

2. The radius of second Bohr’s orbit is

0.053 x 4 nm

0.053 x 20 nm

0.053 nm

0.053/4 nm

Page 3 of 86

3. If Z represents the atomic number and A represents mass number, then the number of electrons in an atom can be computed as

A – Z

Z – A

A + Z

Page 4 of 86

4. The mass of the neutron is of the order of

10¯²⁶ kg

10¯²⁴ kg

10¯²⁷ kg

10¯²³ kg

Page 5 of 86

5. Pressure in gas discharge tube was kept

0.01 torr

0.1 torr

10 torr

1 torr

Page 6 of 86

6. Spectrum is produced due to

All have little contribution

Different wavelength

Different intensities

Different colours

Page 7 of 86

7. The radiations emitted form hydrogen filled discharge tube show

Line spectrum

Band spectrum

Absorption spectrum

Continuous spectrum

Page 8 of 86

8. Number of neutrons in heavy hydrogen atom is

Page 9 of 86

9. The maximum number of electrons that can be accommodated by p – orbital is?

– 6

– 10

– 2

– 14

Page 10 of 86

10. The credit of discovering neutron goes to

Austen

Chadwick

Langmuir

Rutherford

Page 11 of 86

11. Almost the entire mass of an atom is concentrated in the

Neutrons

Nucleus

Electrons

Proton

Page 12 of 86

12. The valence orbital configuration of an element with atomic number 23 is

3d⁵

3d³, 4s¹, 4p¹

3d², 4s², 4p¹

3d³, 4s²

Page 13 of 86

13. Space around nucleus where finding of electrons is maximum is

Orbit

Sub shell

Orbital

Electron cloud

Page 14 of 86

14. In an X-ray tube electrons each of charge e are accelerated through V potential difference allowed to hit a metal target. The wavelength of the X-rays emitted is

Impossible to predict

eV/h

he/ev

he/Ve

Page 15 of 86

15. Mass number is equal to the

Number of electrons

Number of protons + number of neutrons

Number of neutrons + number of electrons

Number of protons + number of electrons

Page 16 of 86

16. The electron in an atom

Moves randomly around the nucleus

Has fixed space around the nucleus

Is stationary in various energy levels

Moves around its nucleus in definite energy levels

Page 17 of 86

17. Radiation emitted by exited atoms is

In the form of quanta

Nuclear radiations

In the form of continuous waves

Ultraviolet radiations

Page 18 of 86

18. Plank’s theory says energy is emitted

Never emit energy

In continuous manner

Discontinuous manner

Simultaneously

Page 19 of 86

19. For which of the following sets of quantum numbers an electron will have the highest energy?

4, 2, -1, ½

5, 0, 0, ½

3, 2, 1, ½

4, 1, 0, -1/2

Page 20 of 86

20. Which one is not true about cathode rays

9.11 x 10¯³¹ kg

Cast shadow

Heat up

Cannot ionized

Page 21 of 86

21. When electron jump into orbit 1 then series obtained is

P fund

Paschen

Lyman

Bracket

Page 22 of 86

22. Which of the following is not charged particles?

Electron

Proton

Neutron

Hydrogen nucleus

Page 23 of 86

23. The K, L and M shells of an atom are full. Its atomic number is

Page 24 of 86

24. Quantum number tells the energy of electron

Page 25 of 86

25. Millikan determined the charge on electron in oil drop experiment. It value is

1.603 x 10¯²³ C

1.602 x 10¯¹⁹ C

6.625 x 10¯³⁴ C

1.602 x 10¯²³ C

Page 26 of 86

26. The number of electrons in the M shell of the element with atomic number 24 is

Page 27 of 86

27. When X-rays are passed through successive aluminum sheets what happens to their thickness?

It remains same

Increases

It decreases

Sometimes increases and sometimes decreases

Page 28 of 86

28. When electrons revolve in stationary orbits,

They become stationary

They are gaining kinetic energy

There is increase in energy

There is no change in energy level

Page 29 of 86

29. Millikan used in atomizer

Oil

Milk

Honey

H₂O

Page 30 of 86

30. The electronic configuration of an atom/ion can be defined by the following

Aufbau principle

Pauli’s exclusion principle

All the above

Hund’s Rule

Page 31 of 86

31. Rutherford’s experiment led to the discovery of

Proton

Electron

α -particle

Nucleus

Page 32 of 86

32. Planks theory says energy is emitted

Discontinuous manner

In continuous manner

In the form of heat

Simultaneously

Page 33 of 86

33. Particles are

Positive charged particles

Beam of neutrons

Gamma radiation

Negative charged particles

Page 34 of 86

34. Where does the cathode rays get deflected?

None of these

Both electric and magnetic field

A magnetic field only

An electric field only

Page 35 of 86

35. An atom has a mass number of 23 and atomic number 11. The number of protons are

Page 36 of 86

36. The magnetic quantum number has value limited directly by the value of

Both a and b

Principal quantum number

Spin

Angular

Page 37 of 86

37. Subsidiary quantum number specifies

Orientations of orbital

Size of orbital

Nuclear stability

Shape of orbital

Page 38 of 86

38. The radius of hydrogen atom in the ground state is 0.53 Å, the radius of ₃Li²⁺ in the similar state is

0.17 Å

0.53 Å

1.06 Å

0.265 Å

Page 39 of 86

39. Which of the air pressures is appropriate for the production of cathode rays in the discharge tube?

0.001 mm Hg

1 cm Hg

1 mm Hg

0.001 cm Hg

Page 40 of 86

40. Wavelength of electron was verified by

Einstein

Garter

Moseley

Davison and Garner

Page 41 of 86

41. Positive rays give flash on

ZnS

ZnO

AgCl plate

AgNO₃ plate

Page 42 of 86

42. P fund series are produced in the spectrum of hydrogen atom

When electrons jump down to 3rd – orbit

When electrons jump down to 4th – orbit

When electrons jump down to 2nd – orbit

When electrons jump down to 5th – orbit

Page 43 of 86

43. When electron collide with heavy particles then which of the following is produced?

x-rays

Beta rays

Gamma rays

Alpha rays

Page 44 of 86

44. Which one of the following will have the maximum charge/mass ratio?

Proton

α particle

Electron

Neutron

Page 45 of 86

45. X-ray are

High energy electrons

High energy photons

Radio isotopes

Of unknown nature

Page 46 of 86

46. The absolute charge of an electron is

-1.6 x 10¯¹⁹ C

1.6 x 10¯¹⁹ C

16 x 10¯¹⁹ C

+ 1.6 x 10¯¹⁹ C

Page 47 of 86

47. An α-particle is

A Helium nucleus

A proton

An electron

A Hydrogen nucleus

Page 48 of 86

48. The quantum number which determines the shape of the orbital is

Principal

Spin

Azimuthal

Magnetic

Page 49 of 86

49. The proton is heavier than an electron by

1850 times

1000 times

1840 times

100 times

Page 50 of 86

50. During a chemical reaction, atomic number

Changes alternately

Changed

Remains same

Changes and then is restored

Page 51 of 86

51. A 4f orbital has

Three node

One node

Four nodes

Two nodes

Page 52 of 86

52. Photon of highest frequency will be absorbed when transition takes place from

2nd to 5th orbit

3rd to 5th orbit

4th to 5th orbit

1st to 5th orbit

Page 53 of 86

53. The mass of the atom is determined by

Neutrons

Electron and neutron

Neutron and proton

Electron

Page 54 of 86

54. A fast moving neutron can eject from nitrogen

r-rays

Β-rays

X-rays

Electrons

Page 55 of 86

55. The electronic configuration of an atom is 2,8,3, The number of valence electrons in the atom is.

Page 56 of 86

56. The letters S, P, d and f are used to represent which quantum number

Principal (p)

Angular momentum (I)

Magnetic (m)

Spin (S)

Page 57 of 86

57. When atom is in the ground state, the electron is present

Nearest to the valence shell

Nearest to the nucleus

In the nucleus

In the second shell

Page 58 of 86

58. The total number of orbitals in a shell with principal quantum number ‘n’ is

2n²

n + 1

n²

Page 59 of 86

59. The number of neutrons in the element ⁹₄Be is

Page 60 of 86

60. Rutherford’s atomic model suggests the existence of

Nucleus

Atom

Mesons

α -particle

Page 61 of 86

61. Hydrogen atom does not emit X-rays because

Its energy levels are too close to each other

It has a single electron

It is too small in size

Its energy levels are too far apart

Page 62 of 86

62. In hydrogen spectrum which one of the following series lies in the ultraviolet region?

Balmer series

P fund series

Lymann series

Bracket series

Page 63 of 86

63. Canal rays are

Gamma radiation

Negative charged particles

Positive charged particles

Beam of neutrons

Page 64 of 86

64. The ratio of the ionization energy of H and Be³⁺ is

1 : 16

1 : 3

1 : 1

1 : 9

Page 65 of 86

65. Ionization energies of the elements of group A are greater than those of Group VI A. The reason is that

Group V A elements half – filled atomic orbitals

Group VI A elements have greater shielding effect

Group V A elements have greater shielding effect

Group V A element have less elector negativity

Page 66 of 86

66. The mass of a neutron is times greater than the mass of electron

1840

1480

2000

540

Page 67 of 86

67. The value of e/m ratio of electron is

1.7588 x 10¹¹ C/kg

9.1095 x 10¯³¹ C/kg

6.02 x 10²³ C/kg

1.7588 x 10²⁰ C/kg

Page 68 of 86

68. The penetrating power of X-rays depends on their

Source

Frequency

Applied voltage

All of these

Page 69 of 86

69. Ruther fords planet like structure was defective and unsatisfactory because

Continuous spectrum

Moving e-accelerate towards the nucleus

All

Behavior of electron remain unexplained

Page 70 of 86

70. Excited atoms return to their ground state in

10-9s

10-6s

10-10s

10-8s

Page 71 of 86

71. The symbol of the element whose atoms have the outer most electronic configuration 2s² 2p³ is

Page 72 of 86

72. The number of spherical nodes in 3p orbitals are

One

Non

Three

Two

Page 73 of 86

73. The letters s p d and f are used to represent which quantum numbers

Spin

Magnetic

Principal

Azimuthal

Page 74 of 86

74. Charge of electron was measured by

Passim

J.J. Thomson

Millikan

Rutherford

Page 75 of 86

75. The relationship between energy of a photon of light and its frequency is given by

Rutherford’s atomic model

De-Broglie’s dual nature of atom

Bohr’s model

Plank’s quantum theory

Page 76 of 86

76. When an atom absorbs energy the bonds in the spectrum will appeal which are

Brighter

Colourless

Hard to locate

Darker

Page 77 of 86

77. The magnetic quantum number (QN) has its values determined directly by the value of

Principal (QN)

Both a and b

Spin (QN)

Azimuthal (QN)

Page 78 of 86

78. Heaviest particle is

Proton

Neutron

Electron

Meson

Page 79 of 86

79. Total number of series in hydrogen spectrum is

Three

Six

Four

Five

Page 80 of 86

80. e/m ratio of the canal rays is less than that of cathode rays. The reason is

Greater mass and charge of the canal ray particles

Greater mass of canal ray particles

Greater charge of the canal ray particles

Actually e/m ratio of canal rays is greater than that of the cathode rays

Page 81 of 86

81. At 200°C hydrogen molecules have velocity 10⁵ cm sec¯¹. The de-Broglie wavelength in this case is approximately

100 Å

2 Å

1000 Å

10 Å

Page 82 of 86

82. The maximum number of electrons in a sub-shell for which l = 3 is

Page 83 of 86

83. Rutherford’s gold foil experiment showed that most of the α particles passed through the gold foil without any deflection. It indicates that.

The nucleus carries the most of the mass

The nucleus is concentrated at the center

There is lot of empty space in atom

The nucleus carries positive charge

Page 84 of 86

84. Choose the value of the Red berg’s constant among the following among the following

1.697 x 10⁷ m¯¹

1.09678 x 10⁷ m¯¹

1.9678 x 10⁷ m¯¹

1.007 x 10⁷ m¯¹

Page 85 of 86

85. No two electrons is the same atom can have identical set of four quantum numbers. This statement is known as?

- Hund’s rule

- Pauli’s Exclusion principle

-(n + 1) rule

- Aufbaus rule

Page 86 of 86

86. Positive particles in discharge tube is produced by ionization of gas molecules which is caused by

Gas molecules are at high temperature

Cathode rays remove the electrons from gas molecules

Gas molecules produce X – rays

Gas molecules collide with anode

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Malik TahirLast Updated: May 24, 2025

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4 Comments

Kamboh Rehan Kamboh says:

April 2, 2023 at 12:30 pm

I wanna mcqs of atomic structure

shoaib says:

February 7, 2022 at 10:12 pm

i want to practise on these questions

saeed ahmed says:

October 23, 2021 at 12:06 am

[email protected]

Hizbullah Junejo says:

April 15, 2021 at 1:02 pm

I got 92%

MDCAT Chemistry Atomic Structure Test Online

Chemistry Atomic MCQS Online Test

MDCAT Chemistry Atomic Chapter Online Test

MDCAT Chemistry Atomic Test

Chemistry

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Malik Tahir

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Chemistry Atomic MCQS Online Test

MDCAT Chemistry Atomic Chapter Online Test

MDCAT Chemistry Atomic Test

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