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MDCAT Physics Dawn of Modern Physics Test Online

Mustansar KhanLast Updated: May 26, 2025

Physics Dawn of Modern Physics MCQS Online Test

MDCAT Physics Dawn of Modern Physics Chapter Online Test

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

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

Rutherford’s gold foil experiment

Young’s double-slit experiment

Michelson-Morley experiment

Photoelectric effect

2. Which photon has more energy?

Red light

Ultraviolet

Microwave

Infrared

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

Refraction

Diffraction

Photoelectric effect

Reflection

4. Planck’s constant is denoted by:

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

Absorption spectrum of hydrogen

Refraction through a prism

Speed of light in vacuum

Total internal reflection

6. The term “quantum” refers to:

Frequency of a wave

Wave motion

Continuous flow of energy

A packet of energy

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

Emission spectra

Photoelectric effect

Interference

Photon momentum

8. Who developed the concept of photons?

Newton

Planck

Bohr

Einstein

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

Short

Infinite

Zero

Long

10. The energy of a photon is given by:

E = hf²

E = hv²

E = hf

E = mc²

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

Decreases

Remains same

Depends on wavelength

Increases

12. The speed of light in vacuum is:

3.00 × 10⁸ m/s

6.63 × 10⁻³⁴ J·s

1.6 × 10⁻¹⁹ C

9.81 m/s²

13. Who first explained blackbody radiation using quantum theory?

De Broglie

Planck

Bohr

Einstein

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

Photoelectric effect

Diffraction

Reflection

Interference

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

Electrons

Atoms

Waves

Photons

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

Photon splits into electrons

Electrons are emitted with high velocity

Light is reflected

No electrons are emitted

17. The photoelectric effect is not observed when:

Light is monochromatic

Intensity is high

Light is polarized

Frequency is below threshold

18. Photon is a quantum of:

Light

Heat

Electricity

Sound

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

Reflection

Blackbody radiation

Diffraction

Static electricity

20. If frequency is doubled, photon energy becomes:

Unchanged

Halved

Quadrupled

Doubled

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

Polarization

Wave-particle duality

Refraction

Diffraction

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

Infinite

Varies with frequency

3 × 10⁸ m/s

Zero

23. What is a photon?

A particle of sound

A massless atom

A quantum of light energy

A particle of electricity

24. What happens to photon energy when frequency increases?

Remains the same

Becomes zero

Decreases

Increases

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

Gravitational constant

Coulomb’s constant

Planck’s constant

Boltzmann constant

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26. Which of the following is true about photons?

They have mass

They are stationary

They have no energy

They travel at speed of light

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

Conduction in wire

Photoelectric effect

Emission of sound

Heating of metal

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

Violet

Green

Red

Blue

29. Which variable directly affects photon energy?

Frequency

Wavelength

Angle of incidence

Velocity

30. Which equation represents Einstein’s photoelectric equation?

E = hv + ϕ

E = hf – ϕ

E = hλ

E = mc²

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

Vibrating air particles

Waving through space

Delivering discrete packets (photons)

Heating matter

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

Quadratic

Direct

No relationship

Inverse

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

Total energy

Work function

Energy of the photon

Kinetic energy

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

Rutherford

Bohr

Planck

Einstein

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

It is a continuous wave

It has mass

It reflects at an angle

It behaves like particles

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

Coulomb

Volt

Newton

Joule

37. Who introduced the concept of quantized energy levels?

Bohr

Einstein

Newton

Planck

38. What does the threshold frequency depend on?

Nature of the metal

Intensity of light

Speed of light

Direction of incidence

39. Which electromagnetic wave has the shortest wavelength?

Infrared

Gamma rays

X-rays

Radio waves

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

Threshold energy

Photon energy

Kinetic energy

Work function

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

Ionization

Reflection

Emission

Photoemission

42. The photoelectric effect supports which model of light?

Ray model

Quantum model

Huygens model

Wave model

43. As per quantum theory, energy is:

Continuous

Conserved only in atoms

Quantized

Random

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

Boltzmann constant

Planck’s constant

Gravitational constant

Avogadro number

45. What is the momentum of a photon?

h/λ

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

Infrared

Radio waves

Ultraviolet

Gamma rays

47. Who proposed the particle nature of light?

Isaac Newton

Niels Bohr

Albert Einstein

James Clerk Maxwell

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

Stays the same

Decreases

Becomes zero

Increases

49. The dual nature of light was confirmed by:

Young

Newton

Einstein

Maxwell

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Mustansar KhanLast Updated: May 26, 2025

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MDCAT Physics Dawn of Modern Physics Test Online

Physics Dawn of Modern Physics MCQS Online Test

MDCAT Physics Dawn of Modern Physics Chapter Online Test

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Physics Dawn of Modern Physics MCQS Online Test

MDCAT Physics Dawn of Modern Physics Chapter Online Test

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