Physics Dawn of Modern Physics Online Mcqs Test

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Question 1

1. The speed of light in vacuum is:

Answer

9.81 m/s²

Answer

3.00 × 10⁸ m/s

Answer

6.63 × 10⁻³⁴ J·s

Answer

1.6 × 10⁻¹⁹ C

Question 2

2. Planck’s constant is denoted by:

Question 3

3. The photoelectric effect is not observed when:

Answer

Light is monochromatic

Answer

Intensity is high

Answer

Light is polarized

Answer

Frequency is below threshold

Question 4

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

Answer

Energy of the photon

Answer

Total energy

Answer

Kinetic energy

Answer

Work function

Question 5

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

Answer

Heating of metal

Answer

Emission of sound

Answer

Photoelectric effect

Answer

Conduction in wire

Question 6

6. What does the threshold frequency depend on?

Answer

Nature of the metal

Answer

Intensity of light

Answer

Direction of incidence

Answer

Speed of light

Question 7

7. The energy of a photon is given by:

Question 8

8. Who introduced the concept of quantized energy levels?

Question 9

9. Photon is a quantum of:

Answer

Electricity

Question 10

10. Which electromagnetic wave has the shortest wavelength?

Answer

Gamma rays

Answer

Radio waves

Question 11

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

Answer

Electrons are emitted with high velocity

Answer

Photon splits into electrons

Answer

Light is reflected

Answer

No electrons are emitted

Question 12

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

Answer

Diffraction

Answer

Reflection

Answer

Photoelectric effect

Answer

Interference

Question 13

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

Question 14

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

Answer

Emission spectra

Answer

Interference

Answer

Photoelectric effect

Answer

Photon momentum

Question 15

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

Question 16

16. Who developed the concept of photons?

Question 17

17. What is the momentum of a photon?

Question 18

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

Answer

Refraction

Answer

Reflection

Answer

Photoelectric effect

Answer

Diffraction

Question 19

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

Answer

Waving through space

Answer

Vibrating air particles

Answer

Heating matter

Answer

Delivering discrete packets (photons)

Question 20

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

Question 21

21. The term “quantum” refers to:

Answer

A packet of energy

Answer

Wave motion

Answer

Continuous flow of energy

Answer

Frequency of a wave

Question 22

22. What happens to photon energy when frequency increases?

Answer

Becomes zero

Answer

Remains the same

Question 23

23. The dual nature of light was confirmed by:

Question 24

24. Who proposed the particle nature of light?

Answer

James Clerk Maxwell

Answer

Albert Einstein

Answer

Niels Bohr

Answer

Isaac Newton

Question 25

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

Answer

Reflection

Answer

Ionization

Answer

Photoemission

Question 26

26. Which variable directly affects photon energy?

Answer

Wavelength

Answer

Angle of incidence

Question 27

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

Answer

It reflects at an angle

Answer

It is a continuous wave

Answer

It behaves like particles

Answer

It has mass

Question 28

28. 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 29

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

Answer

Boltzmann constant

Answer

Gravitational constant

Answer

Planck’s constant

Answer

Coulomb’s constant

Question 30

30. What is a photon?

Answer

A particle of sound

Answer

A quantum of light energy

Answer

A particle of electricity

Answer

A massless atom

Question 31

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

Answer

Rutherford

Question 32

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

Answer

Becomes zero

Answer

Stays the same

Question 33

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

Question 34

34. The photoelectric effect supports which model of light?

Answer

Huygens model

Answer

Wave model

Answer

Quantum model

Question 35

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

Answer

Gravitational constant

Answer

Boltzmann constant

Answer

Planck’s constant

Answer

Avogadro number

Question 36

36. As per quantum theory, energy is:

Answer

Conserved only in atoms

Answer

Continuous

Question 37

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

Answer

Gamma rays

Answer

Radio waves

Answer

Ultraviolet

Question 38

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

Answer

No relationship

Question 39

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

Answer

Blackbody radiation

Answer

Static electricity

Answer

Reflection

Answer

Diffraction

Question 40

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

Answer

3 × 10⁸ m/s

Answer

Varies with frequency

Question 41

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

Answer

Refraction through a prism

Answer

Absorption spectrum of hydrogen

Answer

Speed of light in vacuum

Answer

Total internal reflection

Question 42

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

Answer

Remains same

Answer

Depends on wavelength

Question 43

43. If frequency is doubled, photon energy becomes:

Answer

Quadrupled

Question 44

44. Who first explained blackbody radiation using quantum theory?

Answer

De Broglie

Question 45

45. Which equation represents Einstein’s photoelectric equation?

Answer

E = hf – ϕ

Answer

E = hv + ϕ

Question 46

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

Answer

Refraction

Answer

Polarization

Answer

Diffraction

Answer

Wave-particle duality

Question 47

47. Which photon has more energy?

Answer

Ultraviolet

Question 48

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

Answer

Work function

Answer

Kinetic energy

Answer

Threshold energy

Answer

Photon energy

Question 49

49. Which of the following is true about photons?

Answer

They travel at speed of light

Answer

They have no energy

Answer

They are stationary

Answer

They have mass

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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