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

Blue

Violet

Green

Red

2. As per quantum theory, energy is:

Conserved only in atoms

Quantized

Continuous

Random

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

It has mass

It behaves like particles

It reflects at an angle

It is a continuous wave

4. Which equation represents Einstein’s photoelectric equation?

E = hv + ϕ

E = hf – ϕ

E = hλ

E = mc²

5. The term “quantum” refers to:

Frequency of a wave

Wave motion

A packet of energy

Continuous flow of energy

6. What happens to photon energy when frequency increases?

Becomes zero

Decreases

Increases

Remains the same

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

Photon momentum

Photoelectric effect

Emission spectra

Interference

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

Infinite

Zero

Varies with frequency

3 × 10⁸ m/s

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

Polarization

Diffraction

Wave-particle duality

Refraction

10. What does the threshold frequency depend on?

Speed of light

Nature of the metal

Direction of incidence

Intensity of light

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

Photons

Electrons

Atoms

Waves

12. What is a photon?

A particle of sound

A massless atom

A quantum of light energy

A particle of electricity

13. Which electromagnetic wave has the shortest wavelength?

X-rays

Gamma rays

Radio waves

Infrared

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

No relationship

Quadratic

Direct

Inverse

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

Conduction in wire

Photoelectric effect

Heating of metal

Emission of sound

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

Delivering discrete packets (photons)

Vibrating air particles

Heating matter

Waving through space

17. The photoelectric effect supports which model of light?

Huygens model

Quantum model

Wave model

Ray model

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

Work function

Photon energy

Threshold energy

Kinetic energy

19. The dual nature of light was confirmed by:

Newton

Young

Einstein

Maxwell

20. Which variable directly affects photon energy?

Angle of incidence

Wavelength

Frequency

Velocity

21. Who developed the concept of photons?

Einstein

Newton

Planck

Bohr

22. If frequency is doubled, photon energy becomes:

Doubled

Unchanged

Halved

Quadrupled

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

Energy of the photon

Work function

Total energy

Kinetic energy

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

Avogadro number

Planck’s constant

Boltzmann constant

Gravitational constant

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

Reflection

Photoelectric effect

Refraction

Diffraction

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

Increases

Depends on wavelength

Decreases

Remains same

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

Joule

Volt

Newton

Coulomb

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

Planck’s constant

Coulomb’s constant

Boltzmann constant

Gravitational constant

29. The speed of light in vacuum is:

6.63 × 10⁻³⁴ J·s

1.6 × 10⁻¹⁹ C

9.81 m/s²

3.00 × 10⁸ m/s

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

Rutherford’s gold foil experiment

Photoelectric effect

Michelson-Morley experiment

Young’s double-slit experiment

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

Speed of light in vacuum

Total internal reflection

Refraction through a prism

Absorption spectrum of hydrogen

32. Who introduced the concept of quantized energy levels?

Newton

Bohr

Einstein

Planck

33. Planck’s constant is denoted by:

34. The energy of a photon is given by:

E = hv²

E = hf

E = mc²

E = hf²

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

Blackbody radiation

Diffraction

Reflection

Static electricity

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

Light is reflected

No electrons are emitted

Electrons are emitted with high velocity

Photon splits into electrons

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

Decreases

Becomes zero

Stays the same

Increases

38. Photon is a quantum of:

Light

Electricity

Sound

Heat

39. What is the momentum of a photon?

h/λ

40. The photoelectric effect is not observed when:

Intensity is high

Light is monochromatic

Light is polarized

Frequency is below threshold

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

Einstein

Planck

Bohr

Rutherford

42. Who first explained blackbody radiation using quantum theory?

Einstein

Planck

De Broglie

Bohr

43. Who proposed the particle nature of light?

Niels Bohr

James Clerk Maxwell

Isaac Newton

Albert Einstein

44. Which photon has more energy?

Ultraviolet

Red light

Infrared

Microwave

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

Short

Zero

Long

Infinite

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

Photoelectric effect

Diffraction

Interference

Reflection

47. Which of the following is true about photons?

They have mass

They have no energy

They travel at speed of light

They are stationary

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

Infrared

Gamma rays

Ultraviolet

Radio waves

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

Ionization

Photoemission

Emission

Reflection

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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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