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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. As electron energy levels increase, their spacing:

Increases

Decreases

Becomes infinite

Remains the same

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

Frequency of emitted photon

Size of atom

Mass of nucleus

Speed of electron

3. 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

4. The energy of the emitted photon depends on:

Number of protons

Mass of atom

Speed of the atom

Difference between energy levels

5. What is the unit of Rydberg constant?

m⁻¹

m²

s⁻¹

6. Which statement is true about atomic spectra?

Atoms do not emit light

Atomic spectra are continuous

All atoms have the same spectrum

Each element has a unique line spectrum

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

Hydrogen has only one electron

Hydrogen has a large atomic mass

Hydrogen has only one proton

Hydrogen emits gamma rays

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

Line spectrum

Absorption spectrum

Emission spectrum

Continuous spectrum

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

Lyman

Balmer

Paschen

Pfund

10. Emission spectra result from:

Accelerating electrons

Heating solids

Neutron decay

Electron transitions from higher to lower energy levels

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

Spectral lines vanish

All lines are in ultraviolet region

No effect

Lines become more complex

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

Balmer

Pfund

Paschen

Lyman

13. When an atom absorbs energy:

Electrons fall to lower levels

A proton leaves the nucleus

It turns into another element

Electrons move to higher levels

14. What causes the formation of atomic line spectra?

Nuclear reaction

Vibrating atoms

Electron transitions between energy levels

Molecular bonding

15. Which transition corresponds to the highest frequency photon?

n = 5 to n = 2

n = 4 to n = 2

n = 3 to n = 2

n = 2 to n = 1

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

Paschen

Brackett

Pfund

Balmer

17. What is the ground state of an atom?

Highest energy level

State of maximum kinetic energy

Ionized state

Lowest energy level of the electron

18. Spectral lines are sharp because:

Atoms move slowly

Electron speed is fixed

Energy levels are discrete

Wavelength is infinite

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

n = 3 to n = 2

n = 1 to n = 2

n = 2 to n = 1

n = 4 to n = 3

20. Atomic spectra provide evidence for:

Constant electron speed

Nuclear energy levels

Continuous energy transfer

Discrete energy levels in atoms

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

Energy difference between levels

Velocity of atom

Type of nucleus

Atomic mass

22. Bohr’s theory could not explain:

Zeeman effect and fine structure

Electron charge

Stability of atom

Hydrogen spectrum

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

A continuous wave

A photon emitted or absorbed during electron transition

Vibration of nucleus

A photon with variable energy

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

n = 3 to n = 2

n = ∞ to n = 1

n = 4 to n = 2

n = 2 to n = 1

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

Paschen series

Balmer series

Lyman series

Brackett series

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

Distance of the nucleus

Temperature

Speed of atom

Energy difference between levels

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

Continuous spectrum

Absorption spectrum

Band spectrum

Line emission spectrum

28. The spectral lines of hydrogen are explained using:

Classical mechanics

Bohr’s postulates

Newton’s laws

Maxwell’s equations

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

Einstein’s equation

Rydberg formula

Newton’s equations

Wien’s Law

30. An atom emits radiation when:

A neutron leaves the nucleus

A proton is emitted

An electron moves to a higher energy level

An electron moves to a lower energy level

31. The continuous spectrum is produced by:

Solids and dense gases

Cold gases

Single atoms

Low-pressure gases

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

Atomic spectrum

Mass number

Atomic number

Atomic radius

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

Atoms are neutral

Protons move in orbits

Electrons occupy specific energy levels

Electrons behave like waves

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

Number of allowed transitions

Number of protons

Atomic weight

Number of neutrons

35. In the Bohr model, electrons revolve in:

Random orbits

Spiral paths

Magnetic loops

Circular quantized orbits

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

Different pressures

Different electronic transitions

Different temperatures

Nuclear vibrations

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

Ultraviolet

Microwave

Visible

Infrared

38. In atomic spectra, the lines are:

Circular

Blurred

Sharp and distinct

Continuous

39. Which transition produces ultraviolet radiation in hydrogen?

n = 4 to n = 3

n = 5 to n = 4

n = 2 to n = 1

n = 3 to n = 2

40. The emission spectrum is produced when:

Electrons absorb energy

Electrons return to lower energy levels

Neutrons are emitted

Electrons move to higher levels

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

Lithium

Hydrogen

Sodium

Helium

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

Transitions of electrons between energy levels

Vibrating protons

Rotating nucleus

Movement of neutrons

43. The Rydberg constant is used in:

Einstein’s mass-energy relation

Bohr’s atomic model

Newton’s law of gravitation

Maxwell’s equations

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

Visible

Ultraviolet

Infrared

X-ray

45. The intensity of spectral lines depends on:

Mass of the nucleus

Charge of the proton

Energy level spacing

Number of electrons making the transition

46. Who first explained the line spectrum of hydrogen?

Einstein

Maxwell

Newton

Bohr

47. What is a line absorption spectrum?

A blurred continuous spectrum

Infrared spectrum

Colored background with bright lines

Dark lines on bright background

48. What is meant by excitation of an atom?

Addition of neutron

Electron jumps to higher energy level

Removal of proton

Electron remains in ground state

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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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