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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 unit is used to measure the energy of a photon?

Joule

Coulomb

Newton

Volt

2. As per quantum theory, energy is:

Quantized

Conserved only in atoms

Continuous

Random

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

Increases

Depends on wavelength

Decreases

Remains same

4. The photoelectric effect supports which model of light?

Ray model

Huygens model

Quantum model

Wave model

5. Which electromagnetic wave has the shortest wavelength?

X-rays

Gamma rays

Infrared

Radio waves

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

Refraction through a prism

Speed of light in vacuum

Absorption spectrum of hydrogen

Total internal reflection

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

Ionization

Reflection

Emission

Photoemission

8. Who first explained blackbody radiation using quantum theory?

Planck

Einstein

Bohr

De Broglie

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

Heating matter

Delivering discrete packets (photons)

Vibrating air particles

Waving through space

10. What is a photon?

A particle of sound

A quantum of light energy

A massless atom

A particle of electricity

11. The speed of light in vacuum is:

1.6 × 10⁻¹⁹ C

3.00 × 10⁸ m/s

6.63 × 10⁻³⁴ J·s

9.81 m/s²

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

Emission spectra

Photoelectric effect

Photon momentum

Interference

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

Michelson-Morley experiment

Photoelectric effect

Rutherford’s gold foil experiment

Young’s double-slit experiment

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

Diffraction

Wave-particle duality

Refraction

Polarization

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

Work function

Total energy

Energy of the photon

Kinetic energy

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

It has mass

It behaves like particles

It is a continuous wave

It reflects at an angle

17. Photon is a quantum of:

Sound

Light

Electricity

Heat

18. What does the threshold frequency depend on?

Direction of incidence

Intensity of light

Nature of the metal

Speed of light

19. What is the momentum of a photon?

h/λ

20. Which of the following is true about photons?

They have no energy

They are stationary

They travel at speed of light

They have mass

21. Planck’s constant is denoted by:

22. Who proposed the particle nature of light?

James Clerk Maxwell

Isaac Newton

Albert Einstein

Niels Bohr

23. Which equation represents Einstein’s photoelectric equation?

E = hv + ϕ

E = hλ

E = hf – ϕ

E = mc²

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

Reflection

Static electricity

Diffraction

Blackbody radiation

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

Refraction

Reflection

Photoelectric effect

Diffraction

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

Coulomb’s constant

Gravitational constant

Boltzmann constant

Planck’s constant

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

Inverse

Direct

Quadratic

No relationship

28. If frequency is doubled, photon energy becomes:

Quadrupled

Halved

Doubled

Unchanged

29. The energy of a photon is given by:

E = hv²

E = hf²

E = mc²

E = hf

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

Varies with frequency

Zero

3 × 10⁸ m/s

Infinite

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

Kinetic energy

Work function

Threshold energy

Photon energy

32. Which photon has more energy?

Microwave

Ultraviolet

Red light

Infrared

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

Electrons are emitted with high velocity

No electrons are emitted

Photon splits into electrons

Light is reflected

34. Who developed the concept of photons?

Planck

Bohr

Newton

Einstein

35. Which variable directly affects photon energy?

Frequency

Velocity

Wavelength

Angle of incidence

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

Zero

Short

Infinite

Long

37. The dual nature of light was confirmed by:

Newton

Maxwell

Young

Einstein

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

Increases

Stays the same

Becomes zero

Decreases

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

Waves

Photons

Electrons

Atoms

40. The photoelectric effect is not observed when:

Light is monochromatic

Intensity is high

Light is polarized

Frequency is below threshold

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

Photoelectric effect

Conduction in wire

Emission of sound

Heating of metal

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

Blue

Violet

Red

Green

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

Photoelectric effect

Interference

Diffraction

Reflection

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

Planck

Rutherford

Einstein

Bohr

45. What happens to photon energy when frequency increases?

Increases

Remains the same

Decreases

Becomes zero

46. Who introduced the concept of quantized energy levels?

Newton

Bohr

Einstein

Planck

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

Planck’s constant

Avogadro number

Gravitational constant

Boltzmann constant

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

Ultraviolet

Radio waves

Infrared

Gamma rays

49. The term “quantum” refers to:

A packet of energy

Frequency of a wave

Continuous flow of energy

Wave motion

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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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