Physics Dawn of Modern Physics Online Mcqs Test

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Question 1

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

Answer

3 × 10⁸ m/s

Answer

Varies with frequency

Question 2

2. What does the threshold frequency depend on?

Answer

Intensity of light

Answer

Speed of light

Answer

Direction of incidence

Answer

Nature of the metal

Question 3

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

Answer

Kinetic energy

Answer

Photon energy

Answer

Work function

Answer

Threshold energy

Question 4

4. Who developed the concept of photons?

Question 5

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

Question 6

6. The speed of light in vacuum is:

Answer

9.81 m/s²

Answer

6.63 × 10⁻³⁴ J·s

Answer

3.00 × 10⁸ m/s

Answer

1.6 × 10⁻¹⁹ C

Question 7

7. What is the momentum of a photon?

Question 8

8. The term “quantum” refers to:

Answer

Frequency of a wave

Answer

Continuous flow of energy

Answer

A packet of energy

Answer

Wave motion

Question 9

9. Which equation represents Einstein’s photoelectric equation?

Answer

E = hf – ϕ

Answer

E = hv + ϕ

Question 10

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

Question 11

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

Question 12

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

Answer

Polarization

Answer

Wave-particle duality

Answer

Diffraction

Answer

Refraction

Question 13

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

Answer

Avogadro number

Answer

Gravitational constant

Answer

Planck’s constant

Answer

Boltzmann constant

Question 14

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

Answer

Total energy

Answer

Kinetic energy

Answer

Work function

Answer

Energy of the photon

Question 15

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

Answer

Delivering discrete packets (photons)

Answer

Waving through space

Answer

Vibrating air particles

Answer

Heating matter

Question 16

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

Answer

Planck’s constant

Answer

Gravitational constant

Answer

Boltzmann constant

Answer

Coulomb’s constant

Question 17

17. The photoelectric effect supports which model of light?

Answer

Wave model

Answer

Huygens model

Answer

Quantum model

Question 18

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

Question 19

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

Answer

Emission spectra

Answer

Photon momentum

Answer

Interference

Answer

Photoelectric effect

Question 20

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

Answer

Ultraviolet

Answer

Gamma rays

Answer

Radio waves

Question 21

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

Answer

No relationship

Question 22

22. As per quantum theory, energy is:

Answer

Continuous

Answer

Conserved only in atoms

Question 23

23. Who first explained blackbody radiation using quantum theory?

Answer

De Broglie

Question 24

24. The energy of a photon is given by:

Question 25

25. The photoelectric effect is not observed when:

Answer

Light is monochromatic

Answer

Frequency is below threshold

Answer

Intensity is high

Answer

Light is polarized

Question 26

26. Which photon has more energy?

Answer

Ultraviolet

Question 27

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

Answer

Diffraction

Answer

Static electricity

Answer

Reflection

Answer

Blackbody radiation

Question 28

28. If frequency is doubled, photon energy becomes:

Answer

Quadrupled

Question 29

29. Which of the following is true about photons?

Answer

They are stationary

Answer

They travel at speed of light

Answer

They have no energy

Answer

They have mass

Question 30

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

Answer

Interference

Answer

Photoelectric effect

Answer

Diffraction

Answer

Reflection

Question 31

31. Who introduced the concept of quantized energy levels?

Question 32

32. Which electromagnetic wave has the shortest wavelength?

Answer

Gamma rays

Answer

Radio waves

Question 33

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

Answer

Depends on wavelength

Answer

Remains same

Question 34

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

Answer

Rutherford

Question 35

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

Answer

Young’s double-slit experiment

Answer

Rutherford’s gold foil experiment

Answer

Photoelectric effect

Answer

Michelson-Morley experiment

Question 36

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

Answer

Electrons are emitted with high velocity

Answer

Light is reflected

Answer

Photon splits into electrons

Answer

No electrons are emitted

Question 37

37. Planck’s constant is denoted by:

Question 38

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

Answer

Refraction

Answer

Diffraction

Answer

Reflection

Answer

Photoelectric effect

Question 39

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

Answer

It behaves like particles

Answer

It reflects at an angle

Answer

It is a continuous wave

Answer

It has mass

Question 40

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

Answer

Photoemission

Answer

Reflection

Answer

Ionization

Question 41

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

Answer

Total internal reflection

Answer

Refraction through a prism

Answer

Speed of light in vacuum

Answer

Absorption spectrum of hydrogen

Question 42

42. Photon is a quantum of:

Answer

Electricity

Question 43

43. Which variable directly affects photon energy?

Answer

Angle of incidence

Answer

Wavelength

Question 44

44. What happens to photon energy when frequency increases?

Answer

Remains the same

Answer

Becomes zero

Question 45

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

Answer

Emission of sound

Answer

Photoelectric effect

Answer

Conduction in wire

Answer

Heating of metal

Question 46

46. What is a photon?

Answer

A particle of electricity

Answer

A quantum of light energy

Answer

A massless atom

Answer

A particle of sound

Question 47

47. Who proposed the particle nature of light?

Answer

Albert Einstein

Answer

Niels Bohr

Answer

Isaac Newton

Answer

James Clerk Maxwell

Question 48

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

Answer

Becomes zero

Answer

Stays the same

Question 49

49. The dual nature of light was confirmed by:

Question 50

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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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