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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Page 1 of 2

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1. Which equation represents Einstein’s photoelectric equation?

E = mc²

E = hf – ϕ

E = hv + ϕ

E = hλ

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

Conduction in wire

Heating of metal

Emission of sound

Photoelectric effect

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

Infrared

Gamma rays

Ultraviolet

Radio waves

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

It behaves like particles

It reflects at an angle

It is a continuous wave

It has mass

5. Who introduced the concept of quantized energy levels?

Newton

Einstein

Bohr

Planck

6. The energy of a photon is given by:

E = hv²

E = hf

E = hf²

E = mc²

7. Photon is a quantum of:

Sound

Light

Heat

Electricity

8. The dual nature of light was confirmed by:

Einstein

Maxwell

Young

Newton

9. Who first explained blackbody radiation using quantum theory?

Bohr

Planck

Einstein

De Broglie

10. The term “quantum” refers to:

Wave motion

Continuous flow of energy

Frequency of a wave

A packet of energy

11. As per quantum theory, energy is:

Continuous

Conserved only in atoms

Random

Quantized

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

Decreases

Increases

Remains same

Depends on wavelength

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

Emission

Reflection

Photoemission

Ionization

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

Gravitational constant

Boltzmann constant

Avogadro number

Planck’s constant

15. Which photon has more energy?

Infrared

Ultraviolet

Red light

Microwave

16. What happens to photon energy when frequency increases?

Becomes zero

Increases

Decreases

Remains the same

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

Diffraction

Interference

Reflection

Photoelectric effect

18. The speed of light in vacuum is:

9.81 m/s²

6.63 × 10⁻³⁴ J·s

1.6 × 10⁻¹⁹ C

3.00 × 10⁸ m/s

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

Refraction

Diffraction

Polarization

Wave-particle duality

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

Young’s double-slit experiment

Photoelectric effect

Rutherford’s gold foil experiment

Michelson-Morley experiment

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

Red

Violet

Blue

Green

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

Speed of light in vacuum

Absorption spectrum of hydrogen

Refraction through a prism

Total internal reflection

23. Who proposed the particle nature of light?

Albert Einstein

Niels Bohr

Isaac Newton

James Clerk Maxwell

24. What is a photon?

A quantum of light energy

A particle of sound

A massless atom

A particle of electricity

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

Diffraction

Photoelectric effect

Reflection

Refraction

Page 2 of 2

26. The photoelectric effect is not observed when:

Frequency is below threshold

Light is polarized

Intensity is high

Light is monochromatic

27. If frequency is doubled, photon energy becomes:

Unchanged

Halved

Quadrupled

Doubled

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

Photoelectric effect

Photon momentum

Emission spectra

Interference

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

Diffraction

Static electricity

Blackbody radiation

Reflection

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

Coulomb’s constant

Boltzmann constant

Planck’s constant

Gravitational constant

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

Volt

Coulomb

Joule

Newton

32. Who developed the concept of photons?

Bohr

Planck

Newton

Einstein

33. What is the momentum of a photon?

h/λ

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

Waving through space

Vibrating air particles

Heating matter

Delivering discrete packets (photons)

35. Which variable directly affects photon energy?

Angle of incidence

Frequency

Velocity

Wavelength

36. Which of the following is true about photons?

They travel at speed of light

They have mass

They have no energy

They are stationary

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

Long

Zero

Short

Infinite

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

Increases

Stays the same

Decreases

Becomes zero

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

Planck

Bohr

Einstein

Rutherford

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

Waves

Electrons

Photons

Atoms

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

Photon splits into electrons

Electrons are emitted with high velocity

No electrons are emitted

Light is reflected

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

Work function

Threshold energy

Kinetic energy

Photon energy

43. Which electromagnetic wave has the shortest wavelength?

Radio waves

Gamma rays

X-rays

Infrared

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

Quadratic

No relationship

Inverse

Direct

45. What does the threshold frequency depend on?

Intensity of light

Nature of the metal

Speed of light

Direction of incidence

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

Energy of the photon

Kinetic energy

Total energy

Work function

47. The photoelectric effect supports which model of light?

Wave model

Quantum model

Ray model

Huygens model

48. Planck’s constant is denoted by:

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

Varies with frequency

Zero

Infinite

3 × 10⁸ m/s

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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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