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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.
Test Helpful For:	MDCAT Entry Test Physics Online Test Interview Questions about Physics All Universities Entrance Test Recruitments Tests

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1. What is meant by excitation of an atom?

Electron jumps to higher energy level

Electron remains in ground state

Removal of proton

Addition of neutron

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

Balmer

Pfund

Paschen

Brackett

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

All lines are in ultraviolet region

No effect

Spectral lines vanish

Lines become more complex

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

Different pressures

Different temperatures

Nuclear vibrations

Different electronic transitions

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

Visible

Ultraviolet

Infrared

X-ray

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

Continuous spectrum

Absorption spectrum

Band spectrum

Line emission spectrum

7. The emission spectrum is produced when:

Neutrons are emitted

Electrons return to lower energy levels

Electrons absorb energy

Electrons move to higher levels

8. The Rydberg constant is used in:

Bohr’s atomic model

Einstein’s mass-energy relation

Maxwell’s equations

Newton’s law of gravitation

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

Paschen series

Brackett series

Lyman series

Balmer series

10. 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

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

A photon emitted or absorbed during electron transition

Vibration of nucleus

A continuous wave

A photon with variable energy

12. 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

13. Atomic spectra provide evidence for:

Continuous energy transfer

Discrete energy levels in atoms

Constant electron speed

Nuclear energy levels

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

Rydberg formula

Einstein’s equation

Wien’s Law

Newton’s equations

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

n = 3 to n = 2

n = ∞ to n = 1

n = 2 to n = 1

n = 4 to n = 2

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

Vibrating protons

Movement of neutrons

Rotating nucleus

Transitions of electrons between energy levels

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

Atomic mass

Energy difference between levels

Type of nucleus

Velocity of atom

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

n = 2 to n = 1

n = 3 to n = 2

n = 4 to n = 2

n = 5 to n = 2

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

Frequency of emitted photon

Mass of nucleus

Speed of electron

Size of atom

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

Mass number

Atomic number

Atomic radius

Atomic spectrum

21. Who first explained the line spectrum of hydrogen?

Newton

Einstein

Maxwell

Bohr

22. What is a line absorption spectrum?

Dark lines on bright background

A blurred continuous spectrum

Infrared spectrum

Colored background with bright lines

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

Lyman

Balmer

Paschen

Pfund

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

Energy difference between levels

Temperature

Speed of atom

Distance of the nucleus

25. The spectral lines of hydrogen are explained using:

Newton’s laws

Bohr’s postulates

Maxwell’s equations

Classical mechanics

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

Line spectrum

Absorption spectrum

Emission spectrum

Continuous spectrum

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

Helium

Sodium

Hydrogen

Lithium

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

n = 3 to n = 2

n = 2 to n = 1

n = 1 to n = 2

n = 4 to n = 3

29. When an atom absorbs energy:

A proton leaves the nucleus

Electrons fall to lower levels

Electrons move to higher levels

It turns into another element

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

Paschen

Pfund

Lyman

Balmer

31. In the Bohr model, electrons revolve in:

Circular quantized orbits

Spiral paths

Magnetic loops

Random orbits

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

Electrons occupy specific energy levels

Atoms are neutral

Protons move in orbits

Electrons behave like waves

33. The energy of the emitted photon depends on:

Difference between energy levels

Number of protons

Mass of atom

Speed of the atom

34. Emission spectra result from:

Heating solids

Accelerating electrons

Neutron decay

Electron transitions from higher to lower energy levels

35. The continuous spectrum is produced by:

Cold gases

Low-pressure gases

Single atoms

Solids and dense gases

36. What is the unit of Rydberg constant?

m²

s⁻¹

m⁻¹

37. What causes the formation of atomic line spectra?

Molecular bonding

Electron transitions between energy levels

Nuclear reaction

Vibrating atoms

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

Atomic weight

Number of neutrons

Number of allowed transitions

Number of protons

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

Ultraviolet

Microwave

Visible

Infrared

40. Spectral lines are sharp because:

Atoms move slowly

Wavelength is infinite

Energy levels are discrete

Electron speed is fixed

41. Bohr’s theory could not explain:

Zeeman effect and fine structure

Electron charge

Stability of atom

Hydrogen spectrum

42. The intensity of spectral lines depends on:

Number of electrons making the transition

Mass of the nucleus

Charge of the proton

Energy level spacing

43. Which transition produces ultraviolet radiation in hydrogen?

n = 2 to n = 1

n = 4 to n = 3

n = 5 to n = 4

n = 3 to n = 2

44. 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

45. What is the ground state of an atom?

Lowest energy level of the electron

Highest energy level

Ionized state

State of maximum kinetic energy

46. Which statement is true about atomic spectra?

Each element has a unique line spectrum

All atoms have the same spectrum

Atomic spectra are continuous

Atoms do not emit light

47. In atomic spectra, the lines are:

Sharp and distinct

Continuous

Blurred

Circular

48. As electron energy levels increase, their spacing:

Becomes infinite

Remains the same

Decreases

Increases

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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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