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Physics Dawn of Modern Physics Online Mcqs Test

Mustansar KhanLast Updated: October 15, 2025

Important Dawn of Modern Physics Question and Answer

Total Questions:	49
Time Allowed:	25 Minutes
Total Marks:	49
How to Attempt Test:	Please choose the right Option in MCQ-type question.
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Dawn of Modern Physics Practice Test Online With Explanation

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1. Which form of radiation has the highest photon energy?

Gamma rays

Infrared

Radio waves

Ultraviolet

2. Which electromagnetic wave has the shortest wavelength?

X-rays

Gamma rays

Infrared

Radio waves

3. Which scientist received the Nobel Prize for explaining the photoelectric effect?

Planck

Rutherford

Bohr

Einstein

4. What constant is used in the formula E = hf?

Boltzmann constant

Planck’s constant

Coulomb’s constant

Gravitational constant

5. In the particle model of light, light is composed of:

Electrons

Atoms

Waves

Photons

6. Who introduced the concept of quantized energy levels?

Bohr

Newton

Planck

Einstein

7. Which property of light is explained only by the particle model?

Interference

Photoelectric effect

Diffraction

Reflection

8. What is a photon?

A particle of sound

A massless atom

A particle of electricity

A quantum of light energy

9. Which photon has more energy?

Infrared

Microwave

Ultraviolet

Red light

10. The concept of quantized light energy resolved the problem of:

Static electricity

Blackbody radiation

Reflection

Diffraction

11. Which phenomenon shows both wave and particle nature of light?

Diffraction

Polarization

Wave-particle duality

Refraction

12. The color of light with the lowest photon energy is:

Green

Blue

Violet

Red

13. The photoelectric effect is not observed when:

Intensity is high

Frequency is below threshold

Light is polarized

Light is monochromatic

14. The energy of a photon is given by:

E = hf²

E = hf

E = hv²

E = mc²

15. What is the speed of all photons in a vacuum?

Varies with frequency

Infinite

3 × 10⁸ m/s

Zero

16. Which unit is used to measure the energy of a photon?

Joule

Newton

Volt

Coulomb

17. What happens to the kinetic energy of emitted electrons when light intensity is increased?

Decreases

Increases

Remains same

Depends on wavelength

18. What is the relationship between photon energy and wavelength?

Inverse

Direct

Quadratic

No relationship

19. Which experiment provided evidence for the particle nature of light?

Rutherford’s gold foil experiment

Young’s double-slit experiment

Photoelectric effect

Michelson-Morley experiment

20. Which aspect of light is explained by wave theory, not particle theory?

Interference

Photon momentum

Photoelectric effect

Emission spectra

21. As frequency increases, what happens to the photon’s wavelength?

Stays the same

Increases

Becomes zero

Decreases

22. Who developed the concept of photons?

Planck

Bohr

Newton

Einstein

23. Which of the following supports the particle nature of light?

Refraction

Photoelectric effect

Reflection

Diffraction

24. The speed of light in vacuum is:

6.63 × 10⁻³⁴ J·s

3.00 × 10⁸ m/s

9.81 m/s²

1.6 × 10⁻¹⁹ C

25. If frequency is doubled, photon energy becomes:

Quadrupled

Unchanged

Halved

Doubled

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26. Which process requires photons to have energy greater than the work function?

Photoelectric effect

Conduction in wire

Heating of metal

Emission of sound

27. The dual nature of light was confirmed by:

Newton

Einstein

Maxwell

Young

28. Planck’s constant is denoted by:

29. According to the particle model, light transfers energy by:

Waving through space

Delivering discrete packets (photons)

Vibrating air particles

Heating matter

30. Which of the following best demonstrates the quantized nature of light?

Absorption spectrum of hydrogen

Speed of light in vacuum

Total internal reflection

Refraction through a prism

31. Which term describes the ability of photons to eject electrons?

Emission

Ionization

Photoemission

Reflection

32. What happens to photon energy when frequency increases?

Becomes zero

Increases

Remains the same

Decreases

33. Photon is a quantum of:

Light

Heat

Electricity

Sound

34. The photoelectric effect supports which model of light?

Huygens model

Wave model

Ray model

Quantum model

35. The minimum energy required to remove an electron from a metal surface is called:

Threshold energy

Photon energy

Kinetic energy

Work function

36. The term “quantum” refers to:

Frequency of a wave

Wave motion

A packet of energy

Continuous flow of energy

37. If the frequency of incident light is less than the threshold frequency:

Electrons are emitted with high velocity

Light is reflected

Photon splits into electrons

No electrons are emitted

38. Who proposed the particle nature of light?

James Clerk Maxwell

Isaac Newton

Albert Einstein

Niels Bohr

39. What does “hf” represent in the photoelectric effect?

Kinetic energy

Total energy

Work function

Energy of the photon

40. What does the equation E = hf suggest about light?

It reflects at an angle

It is a continuous wave

It has mass

It behaves like particles

41. What does the threshold frequency depend on?

Nature of the metal

Direction of incidence

Intensity of light

Speed of light

42. What is the wavelength of a photon with high energy?

Infinite

Long

Short

Zero

43. As per quantum theory, energy is:

Quantized

Conserved only in atoms

Continuous

Random

44. Which of the following constants is required to calculate photon energy?

Gravitational constant

Avogadro number

Boltzmann constant

Planck’s constant

45. Which equation represents Einstein’s photoelectric equation?

E = hv + ϕ

E = hf – ϕ

E = mc²

E = hλ

46. Who first explained blackbody radiation using quantum theory?

Einstein

Bohr

De Broglie

Planck

47. Which of the following is true about photons?

They have no energy

They have mass

They travel at speed of light

They are stationary

48. Which variable directly affects photon energy?

Angle of incidence

Velocity

Frequency

Wavelength

49. What is the momentum of a photon?

h/λ

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Mustansar KhanLast Updated: October 15, 2025

Physics Dawn of Modern Physics Online Mcqs Test

Important Dawn of Modern Physics Question and Answer

Dawn of Modern Physics Practice Test Online With Explanation

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