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.
Test Helpful For:	Physics Test ECAT Test MDCAT Test FPSC/PPSC/SPSC/KPPSC/BPSC/AJKPSC/NTS Physics Interview Question Answer

Dawn of Modern Physics Practice Test Online With Explanation

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1. What happens to photon energy when frequency increases?

Increases

Decreases

Remains the same

Becomes zero

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

Vibrating air particles

Heating matter

Delivering discrete packets (photons)

Waving through space

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

Inverse

Quadratic

Direct

No relationship

4. Which photon has more energy?

Microwave

Red light

Infrared

Ultraviolet

5. Who proposed the particle nature of light?

Albert Einstein

Isaac Newton

James Clerk Maxwell

Niels Bohr

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

Static electricity

Blackbody radiation

Reflection

Diffraction

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

Interference

Photoelectric effect

Photon momentum

Emission spectra

8. Planck’s constant is denoted by:

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

Waves

Electrons

Photons

Atoms

10. The photoelectric effect is not observed when:

Light is polarized

Frequency is below threshold

Intensity is high

Light is monochromatic

11. Who first explained blackbody radiation using quantum theory?

De Broglie

Planck

Bohr

Einstein

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

It is a continuous wave

It reflects at an angle

It behaves like particles

It has mass

13. What is a photon?

A massless atom

A particle of sound

A particle of electricity

A quantum of light energy

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

Reflection

Photoemission

Emission

Ionization

15. Which of the following is true about photons?

They have mass

They have no energy

They travel at speed of light

They are stationary

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

Decreases

Increases

Becomes zero

Stays the same

17. Who developed the concept of photons?

Newton

Einstein

Bohr

Planck

18. Who introduced the concept of quantized energy levels?

Bohr

Newton

Planck

Einstein

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

Long

Infinite

Short

Zero

20. Photon is a quantum of:

Sound

Electricity

Light

Heat

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

Kinetic energy

Work function

Threshold energy

Photon energy

22. What is the momentum of a photon?

h/λ

23. Which variable directly affects photon energy?

Velocity

Wavelength

Angle of incidence

Frequency

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

Reflection

Photoelectric effect

Diffraction

Interference

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

Conduction in wire

Heating of metal

Photoelectric effect

Emission of sound

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26. Which equation represents Einstein’s photoelectric equation?

E = hv + ϕ

E = hλ

E = mc²

E = hf – ϕ

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

Depends on wavelength

Remains same

Increases

Decreases

28. The dual nature of light was confirmed by:

Newton

Einstein

Young

Maxwell

29. The term “quantum” refers to:

Frequency of a wave

Continuous flow of energy

Wave motion

A packet of energy

30. As per quantum theory, energy is:

Quantized

Random

Continuous

Conserved only in atoms

31. What does the threshold frequency depend on?

Direction of incidence

Intensity of light

Nature of the metal

Speed of light

32. If frequency is doubled, photon energy becomes:

Quadrupled

Unchanged

Doubled

Halved

33. Which electromagnetic wave has the shortest wavelength?

Gamma rays

Radio waves

X-rays

Infrared

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

Electrons are emitted with high velocity

Photon splits into electrons

Light is reflected

No electrons are emitted

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

Boltzmann constant

Planck’s constant

Gravitational constant

Avogadro number

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

Violet

Red

Blue

Green

37. The photoelectric effect supports which model of light?

Quantum model

Wave model

Ray model

Huygens model

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

Total energy

Work function

Energy of the photon

Kinetic energy

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

Planck’s constant

Gravitational constant

Coulomb’s constant

Boltzmann constant

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

Refraction through a prism

Absorption spectrum of hydrogen

Speed of light in vacuum

Total internal reflection

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

Radio waves

Infrared

Ultraviolet

Gamma rays

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

Newton

Volt

Coulomb

Joule

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

Zero

3 × 10⁸ m/s

Infinite

Varies with frequency

44. The energy of a photon is given by:

E = hv²

E = mc²

E = hf²

E = hf

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

Rutherford

Einstein

Planck

Bohr

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

Refraction

Diffraction

Reflection

Photoelectric effect

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

Photoelectric effect

Young’s double-slit experiment

Rutherford’s gold foil experiment

Michelson-Morley experiment

48. The speed of light in vacuum is:

3.00 × 10⁸ m/s

1.6 × 10⁻¹⁹ C

9.81 m/s²

6.63 × 10⁻³⁴ J·s

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

Diffraction

Refraction

Wave-particle duality

Polarization

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Mustansar KhanLast Updated: October 15, 2025

Important Dawn of Modern Physics Question and Answer

Dawn of Modern Physics Practice Test Online With Explanation

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