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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. Atomic spectra provide evidence for:

Nuclear energy levels

Discrete energy levels in atoms

Constant electron speed

Continuous energy transfer

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

n = 2 to n = 1

n = ∞ to n = 1

n = 4 to n = 2

n = 3 to n = 2

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

Band spectrum

Absorption spectrum

Continuous spectrum

Line emission spectrum

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

Lyman series

Balmer series

Brackett series

Paschen series

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

Infrared

Visible

X-ray

Ultraviolet

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

Transitions of electrons between energy levels

Movement of neutrons

Rotating nucleus

Vibrating protons

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

n = 5 to n = 2

n = 2 to n = 1

n = 3 to n = 2

n = 4 to n = 2

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

Atomic spectrum

Atomic number

Mass number

Atomic radius

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

Absorption spectrum

Continuous spectrum

Emission spectrum

Line spectrum

10. In atomic spectra, the lines are:

Continuous

Blurred

Sharp and distinct

Circular

11. Emission spectra result from:

Electron transitions from higher to lower energy levels

Accelerating electrons

Heating solids

Neutron decay

12. What is the unit of Rydberg constant?

s⁻¹

m⁻¹

m²

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

Type of nucleus

Velocity of atom

Energy difference between levels

Atomic mass

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

Balmer

Paschen

Pfund

Lyman

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

Number of allowed transitions

Number of neutrons

Atomic weight

Number of protons

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

Speed of atom

Temperature

Distance of the nucleus

Energy difference between levels

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

Different pressures

Different electronic transitions

Nuclear vibrations

Different temperatures

18. Which transition corresponds to the highest frequency photon?

n = 3 to n = 2

n = 4 to n = 2

n = 2 to n = 1

n = 5 to n = 2

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

Hydrogen emits gamma rays

Hydrogen has only one proton

Hydrogen has a large atomic mass

Hydrogen has only one electron

20. The continuous spectrum is produced by:

Low-pressure gases

Single atoms

Solids and dense gases

Cold gases

21. What is meant by excitation of an atom?

Addition of neutron

Electron jumps to higher energy level

Electron remains in ground state

Removal of proton

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

Pfund

Paschen

Balmer

Lyman

23. Who first explained the line spectrum of hydrogen?

Bohr

Maxwell

Einstein

Newton

24. The emission spectrum is produced when:

Electrons move to higher levels

Electrons absorb energy

Neutrons are emitted

Electrons return to lower energy levels

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

All lines are in ultraviolet region

Spectral lines vanish

No effect

Lines become more complex

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

n = 3 to n = 2

n = 1 to n = 2

n = 4 to n = 3

n = 2 to n = 1

27. The Rydberg constant is used in:

Maxwell’s equations

Newton’s law of gravitation

Einstein’s mass-energy relation

Bohr’s atomic model

28. Bohr’s theory could not explain:

Hydrogen spectrum

Electron charge

Zeeman effect and fine structure

Stability of atom

29. In the Bohr model, electrons revolve in:

Random orbits

Magnetic loops

Spiral paths

Circular quantized orbits

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

A continuous wave

A photon with variable energy

Vibration of nucleus

A photon emitted or absorbed during electron transition

31. What causes the formation of atomic line spectra?

Nuclear reaction

Vibrating atoms

Electron transitions between energy levels

Molecular bonding

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

Protons move in orbits

Electrons behave like waves

Electrons occupy specific energy levels

Atoms are neutral

33. As electron energy levels increase, their spacing:

Becomes infinite

Remains the same

Decreases

Increases

34. Which statement is true about atomic spectra?

Atomic spectra are continuous

Each element has a unique line spectrum

Atoms do not emit light

All atoms have the same spectrum

35. Spectral lines are sharp because:

Wavelength is infinite

Energy levels are discrete

Electron speed is fixed

Atoms move slowly

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

Size of atom

Speed of electron

Frequency of emitted photon

Mass of nucleus

37. The intensity of spectral lines depends on:

Charge of the proton

Energy level spacing

Mass of the nucleus

Number of electrons making the transition

38. What is the ground state of an atom?

Lowest energy level of the electron

Ionized state

State of maximum kinetic energy

Highest energy level

39. The energy of the emitted photon depends on:

Mass of atom

Number of protons

Difference between energy levels

Speed of the atom

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

Lithium

Helium

Sodium

Hydrogen

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

Pfund

Paschen

Balmer

Brackett

42. When an atom absorbs energy:

Electrons fall to lower levels

Electrons move to higher levels

A proton leaves the nucleus

It turns into another element

43. An atom emits radiation when:

A proton is emitted

An electron moves to a higher energy level

An electron moves to a lower energy level

A neutron leaves the nucleus

44. The spectral lines of hydrogen are explained using:

Maxwell’s equations

Classical mechanics

Bohr’s postulates

Newton’s laws

45. Which transition produces ultraviolet radiation in hydrogen?

n = 2 to n = 1

n = 4 to n = 3

n = 3 to n = 2

n = 5 to n = 4

46. What is a line absorption spectrum?

Infrared spectrum

Dark lines on bright background

A blurred continuous spectrum

Colored background with bright lines

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

Visible

Microwave

Infrared

Ultraviolet

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

Einstein’s equation

Rydberg formula

Wien’s Law

Newton’s equations

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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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