MDCAT XII Physics Quantam Physics Online Test-2

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Test Details:

Subject: Physics
Class: 2nd year / XII
Chapter Name: Quantam Physics
Test: MDCAT 2025
Book: Sindh Textbook
Total No. Of MCQS: 50 MCQS
Time Allowed: 50 Minutes
Price: Free

100

Created on April 30, 2025 By

medicoengineer.com

MDCAT XII Physics Quantam Physics Online Test-2

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NameEmailPhone Number

1 / 50

1. Quantum physics is the study of matter at:

a) Subatomic level

b) Atomic level

c) Molecular level

d) Both A and B

2 / 50

2. What will be the wavelength of a 66.3 kg object moving with 0.1 m/s?

a) 6.63 × 10⁻³⁴

b) 66.6 × 10⁻³⁴

c) 10 × 10⁻³⁴

d) 1 × 10⁻³⁴

3 / 50

3. According to de Broglie, every particle behaves as a:

a) Photon

b) Wave

c) Solid particle

d) Both A and B

4 / 50

4. If the mass of a body is halved and momentum is increased 4 times, what will happen to the de Broglie wavelength?

a) It becomes 2 times

b) It becomes half

c) It becomes ¼

d) It becomes 4 times

5 / 50

5. What is proved through Compton’s experiment?

a) Photon theory of light

b) Wave theory of light

c) Dual nature of light

d) None of these

6 / 50

6. If electrons of 23 eV are incident on a material whose work function is 5 eV, what will be the maximum K.E. of the electrons?

a) 5 eV

b) 23 eV

c) 28 eV

d) 18 eV

7 / 50

7. According to quantum theory of physics:

a) Energy is quantized

b) Radiations have particle nature

c) Energy of radiation is determined by amplitude

d) Both A and B

8 / 50

8. Compton shift is maximum at an angle of:

a) 60°

b) 90°

c) 180°

d) 270°

9 / 50

9. The cut-off potential depends on:

a) Intensity of incident light

b) Frequency of incident light

c) Amplitude of incident light

d) Both A and B

10 / 50

10. What is the energy of a photon having a wavelength of 19.89 nm?

a) 1 × 10⁻¹⁶ J

b) 1 × 10⁻¹⁷ J

c) 1 × 10⁻¹⁸ J

d) 1 × 10⁻¹⁹ J

11 / 50

11. Electromagnetic radiations are actually:

a) Photons

b) Massless particles

c) Both A and B

d) None of these

12 / 50

12. Which of the following are wave-like properties of electrons?

a) Momentum and frequency

b) Energy and diffraction

c) Diffraction and frequency

d) Frequency and energy

13 / 50

13. Photons are deflected when placed in a:

a) Magnetic field

b) Electric field

c) Electric and magnetic field

d) None of these

14 / 50

14. Uncertainty in position and momentum is a description of:

a) Wave nature

b) Particle nature

c) Dual nature

d) Can’t be determined

15 / 50

15. According to classical theory, photoelectric current increases with an increase in:

a) Potential difference

b) Intensity of radiation

c) Either potential difference or intensity

d) None of these

16 / 50

16. Compton effect is experimental proof of:

a) Dual nature

b) Wave nature

c) Particle nature

d) None of these

17 / 50

17. Which law holds good specifically for longer wavelengths?

a) Planck’s law

b) Wien’s law

c) Stefan’s law

d) Rayleigh’s law

18 / 50

18. What is the energy of a photon having a frequency of 100 Hz?

a) 6.63 × 10⁻³¹ J

b) 6.63 × 10⁻³² J

c) 6.63 × 10⁻³³ J

d) 6.63 × 10⁻³⁴ J

19 / 50

19. In Compton’s experiment, which rays were used?

a) UV rays

b) Gamma rays

c) X-rays

d) IR rays

20 / 50

20. There is a very small time lag between the incidence and emission of photoelectrons. This is in accordance with:

a) Classical theory

b) Experimental result

c) Wave theory

d) None of these

21 / 50

21. What factors are conserved in pair production?

a) Momentum

b) Energy

c) Charge

d) All of these

22 / 50

22. Which pair of particles interact with each other so rapidly that they can’t exist at the same place?

a) Electron, proton

b) Neutron, positron

c) Neutron, electron

d) Electron, positron

23 / 50

23. Photoelectric effect can be explained if radiation is considered as:

a) Particle

b) Wave

c) Dual nature

d) Can’t be determined

24 / 50

24. In an electron microscope, which hypotheses are used?

a) Heisenberg principle

b) de Broglie principle

c) Davisson–Germer experiment

d) Both B and C

25 / 50

25. When a photon is incident on a material:

a) Some energy is converted into the kinetic energy of the electron

b) Some energy is used to free the electron

c) Some energy is lost as heat

d) Both A and B

e) All of these

26 / 50

26. Frequency of incident radiation is independent of:

a) Potential difference

b) Intensity of photocurrent

c) Both A and B

d) None of these

27 / 50

27. According to de Broglie:

a) Energy can have both particle and wave nature

b) Matter can have both particle and wave nature

c) Both A and B

d) None of these

28 / 50

28. By increasing the temperature of a body, the wavelength ____ and frequency ____:

a) Increases, increases

b) Increases, decreases

c) Decreases, increases

d) Decreases, decreases

29 / 50

29. In the diagram, two balls are shown. Consider them as particles. When these two balls join, gamma rays are released. What are these two balls?

a) Proton, electron

b) Electron, neutron

c) Positron, electron

d) Neutron, positron

30 / 50

30. If the intensity of photoelectric current is doubled, then the stopping potential will:

a) Double

b) Halve

c) Remain the same

d) Can't be determined

31 / 50

31. If the mass of a body is increased two times and velocity is decreased two times, what will happen to the de Broglie wavelength?

a) It becomes double

b) It becomes half

c) It will remain the same

d) Can't be determined

32 / 50

32. Classical wave theory:

a) Explains the Compton effect

b) Explains the photoelectric effect

c) Explains black body radiation

d) None of these

33 / 50

33. What are the wave and particle characters in the de Broglie equation?

a) Frequency, mass

b) Frequency, momentum

c) Wavelength, frequency

d) Wavelength, momentum

34 / 50

34. Heisenberg's principle applies to the measurement of properties of:

a) Atomic-sized particles

b) Subatomic-sized particles

c) Molecular-sized particles

d) Both A and B

35 / 50

35. The black body spectrum depends on:

a) Temperature

b) Wavelength

c) Frequency

d) All of these

36 / 50

36. The uncertainty principle is applied to:

a) Wave nature

b) Particle nature

c) Both wave and particle nature

d) Can't be determined

37 / 50

37. The amount of energy a star radiates can be determined by:

a) Wien’s law

b) Stefan’s law

c) Rayleigh’s law

d) All of these

38 / 50

38. Which of the following statements is/are correct regarding de Broglie's hypothesis?

a) All matter particles in motion are associated with waves

b) Only charged particles in motion are associated with waves

c) All waves in motion are associated with particles

d) All waves in motion are associated with only charged particles

39 / 50

39. As the temperature of a body decreases:

a) Blue shift occurs

b) Red shift occurs

c) Both blue and red shift occur

d) Can't be determined

40 / 50

40. The concept of quantum physics started after:

a) Stefan’s law

b) Planck’s theory

c) Uncertainty principle

d) Can't be determined

41 / 50

41. How is the rate of emission of radiation changed?

a) It increases with temperature increase

b) It decreases with temperature increase

c) It remains the same with temperature increase

d) Can't be determined

42 / 50

42. The ultraviolet catastrophe effect was seen in:

a) Planck’s theory

b) Stefan’s law

c) Rayleigh’s law

d) Wien’s law

43 / 50

43. Which principle was used in the Davisson-Germer experiment?

a) Interference

b) Deflection

c) Diffraction

d) Superposition

44 / 50

44. Which of the following can have particle nature?

a) Electromagnetic radiation

b) X-rays

c) Photons

d) All of these

45 / 50

45. The best description for two photons moving in opposite directions in matter annihilation is:

a) Momentum is conserved

b) Charge is conserved

c) Mass is conserved

d) Both A and B

e) Both A and C

46 / 50

46. The energy of a photon of wavelength 5×10⁻⁴ is ------ times greater than that of a photon of wavelength 5×10⁻².

a) 10

b) 100

c) 1000

d) none of these

47 / 50

47. If an alpha particle and a proton are moving with the same velocity, then the de Broglie wavelength of the proton is:

a) 2 times less than the wavelength of the alpha particle

b) 4 times greater than the wavelength of the alpha particle

c) 4 times less than the wavelength of the alpha particle

d) Equal to the wavelength of the alpha particle

48 / 50

48. According to the dual nature of radiation:

a) A particle has dual nature

b) A wave has dual nature

c) Both particle and wave have dual nature

d) Can't be determined

49 / 50

49. At what angle is the Compton wavelength equal to half of the Compton shift?

a) 0°

b) 30°

c) 60°

d) 90°

50 / 50

50. According to the Davisson-Germer equation, the wavelength is:

a) Directly proportional to the square of the accelerating potential

b) Directly proportional to the square root of the accelerating potential

c) Inversely proportional to the square of the accelerating potential

d) Inversely proportional to the square root of the accelerating potential

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MDCAT XII Physics Quantam Physics Online Test-2

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