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MDCAT Physics Atomic spectra Test Online

Mustansar KhanLast Updated: May 26, 2025

Physics Atomic spectra MCQS Online Test

MDCAT Physics Atomic spectra Chapter Online Test

Total Questions:	48
Time Allowed:	25 Minutes
Total Marks:	48
How to Attempt Test:	Please choose the right Option in MCQ-type question.
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1. The Rydberg constant is used in:

Bohr’s atomic model

Newton’s law of gravitation

Einstein’s mass-energy relation

Maxwell’s equations

2. Bohr’s theory could not explain:

Electron charge

Zeeman effect and fine structure

Stability of atom

Hydrogen spectrum

3. Which element's spectrum did Bohr's theory explain most successfully?

Hydrogen

Helium

Lithium

Sodium

4. The continuous spectrum is produced by:

Low-pressure gases

Solids and dense gases

Cold gases

Single atoms

5. Which region of the spectrum corresponds to the Brackett series?

Visible

Microwave

Infrared

Ultraviolet

6. The spectrum consisting of discrete bright lines is called:

Band spectrum

Continuous spectrum

Line emission spectrum

Absorption spectrum

7. In the Bohr model, electrons revolve in:

Spiral paths

Random orbits

Circular quantized orbits

Magnetic loops

8. Which type of spectrum is produced when white light passes through a cool gas?

Absorption spectrum

Line spectrum

Continuous spectrum

Emission spectrum

9. Emission spectra result from:

Heating solids

Neutron decay

Electron transitions from higher to lower energy levels

Accelerating electrons

10. The number of lines in hydrogen spectrum is determined by:

Atomic weight

Number of neutrons

Number of allowed transitions

Number of protons

11. What is meant by excitation of an atom?

Addition of neutron

Removal of proton

Electron remains in ground state

Electron jumps to higher energy level

12. The discrete nature of atomic spectra supports the idea that:

Electrons occupy specific energy levels

Protons move in orbits

Electrons behave like waves

Atoms are neutral

13. Which series of lines in hydrogen spectrum lies in the visible region?

Balmer series

Paschen series

Lyman series

Brackett series

14. Who first explained the line spectrum of hydrogen?

Newton

Einstein

Bohr

Maxwell

15. Which of the following is a unique fingerprint of an element?

Atomic number

Mass number

Atomic radius

Atomic spectrum

16. The hydrogen spectral series in the far-infrared region is:

Paschen

Balmer

Brackett

Pfund

17. Which spectral series corresponds to transitions ending at n = 3?

Pfund

Balmer

Paschen

Lyman

18. What is the ground state of an atom?

Lowest energy level of the electron

Ionized state

Highest energy level

State of maximum kinetic energy

19. Spectral lines are sharp because:

Electron speed is fixed

Energy levels are discrete

Atoms move slowly

Wavelength is infinite

20. What is the effect of increasing atomic number on spectral lines?

All lines are in ultraviolet region

No effect

Lines become more complex

Spectral lines vanish

21. Which transition corresponds to the highest frequency photon?

n = 5 to n = 2

n = 4 to n = 2

n = 2 to n = 1

n = 3 to n = 2

22. Why are spectral lines of hydrogen well-defined?

Hydrogen emits gamma rays

Hydrogen has a large atomic mass

Hydrogen has only one electron

Hydrogen has only one proton

23. Which transition emits visible light in the Balmer series?

n = 1 to n = 2

n = 3 to n = 2

n = 2 to n = 1

n = 4 to n = 3

24. Which transition produces ultraviolet radiation in hydrogen?

n = 3 to n = 2

n = 4 to n = 3

n = 2 to n = 1

n = 5 to n = 4

25. Which series has the longest wavelength in the hydrogen spectrum?

Paschen

Balmer

Pfund

Lyman

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26. An atom emits radiation when:

An electron moves to a lower energy level

An electron moves to a higher energy level

A proton is emitted

A neutron leaves the nucleus

27. What determines the color of light emitted in the line spectrum?

Speed of electron

Mass of nucleus

Size of atom

Frequency of emitted photon

28. In atomic spectra, the lines are:

Sharp and distinct

Blurred

Circular

Continuous

29. What does each line in an atomic spectrum represent?

A photon emitted or absorbed during electron transition

A photon with variable energy

A continuous wave

Vibration of nucleus

30. What is the unit of Rydberg constant?

m⁻¹

m²

s⁻¹

31. The wavelength of light emitted during an electronic transition depends on:

Distance of the nucleus

Temperature

Speed of atom

Energy difference between levels

32. What is the cause of different lines in the atomic spectrum?

Nuclear vibrations

Different temperatures

Different electronic transitions

Different pressures

33. When an atom absorbs energy:

Electrons move to higher levels

It turns into another element

Electrons fall to lower levels

A proton leaves the nucleus

34. The Lyman series appears in which region of the spectrum?

Visible

Ultraviolet

Infrared

X-ray

35. What is a line absorption spectrum?

Colored background with bright lines

Infrared spectrum

Dark lines on bright background

A blurred continuous spectrum

36. The intensity of spectral lines depends on:

Energy level spacing

Mass of the nucleus

Charge of the proton

Number of electrons making the transition

37. The first line of the Balmer series is produced by transition from:

n = 3 to n = 2

n = 2 to n = 1

n = 5 to n = 2

n = 4 to n = 2

38. The frequency of light emitted during an electron transition is related to:

Velocity of atom

Energy difference between levels

Atomic mass

Type of nucleus

39. The wavelength of spectral lines in hydrogen can be calculated using:

Newton’s equations

Rydberg formula

Einstein’s equation

Wien’s Law

40. The emission spectrum is produced when:

Neutrons are emitted

Electrons move to higher levels

Electrons return to lower energy levels

Electrons absorb energy

41. What causes the formation of atomic line spectra?

Nuclear reaction

Molecular bonding

Electron transitions between energy levels

Vibrating atoms

42. What is the source of the hydrogen emission spectrum?

Movement of neutrons

Transitions of electrons between energy levels

Rotating nucleus

Vibrating protons

43. Which statement is true about atomic spectra?

Atoms do not emit light

Each element has a unique line spectrum

All atoms have the same spectrum

Atomic spectra are continuous

44. Which transition emits the highest energy photon in hydrogen?

n = 4 to n = 2

n = ∞ to n = 1

n = 2 to n = 1

n = 3 to n = 2

45. The energy of the emitted photon depends on:

Mass of atom

Speed of the atom

Difference between energy levels

Number of protons

46. Atomic spectra provide evidence for:

Constant electron speed

Continuous energy transfer

Nuclear energy levels

Discrete energy levels in atoms

47. As electron energy levels increase, their spacing:

Becomes infinite

Increases

Decreases

Remains the same

48. The spectral lines of hydrogen are explained using:

Newton’s laws

Maxwell’s equations

Classical mechanics

Bohr’s postulates

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Mustansar KhanLast Updated: May 26, 2025

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MDCAT Physics Atomic spectra Test Online

Physics Atomic spectra MCQS Online Test

MDCAT Physics Atomic spectra Chapter Online Test

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Physics Atomic spectra MCQS Online Test

MDCAT Physics Atomic spectra Chapter Online Test

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Mustansar Khan

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