MDCAT XII Physics Atomic Physics Online Test-2

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Test Details:

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

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Created on May 02, 2025 By

medicoengineer.com

MDCAT XII Physics Atomic Physics Online Test-2

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NameEmailPhone Number

1 / 50

1. Which of the following is correct regarding the energy level of an electron in an atom?

a) Number of electrons is greater than energy states in an atom

b) Number of energy states is greater than electrons in an atom

c) Number of energy states is equal to number of electrons in an atom

d) None of these

2 / 50

2. Electrons present in an atom have:

a) Diffuse and specific energies

b) Diffused and same energies

c) Discrete and specific energies

d) Discrete and same energies

3 / 50

3. An electron in a hydrogen atom jumps from the second excited state to the ground state. What is the frequency of the emitted radiation?

a) 2.9 × 10¹⁵ Hz

b) 2.9 × 10¹⁶ Hz

c) 1.05 × 10¹⁵ Hz

d) 1.05 × 10¹⁶ Hz

4 / 50

4. In which transition is radiation with more energy absorbed?

a) From n₁ to n₂

b) From n₁ to n₃

c) From n₁ to n₄

d) From n₁ to n₅

5 / 50

5. Elements can be identified by their:

a) Excitation potential

b) Ionization potential

c) Their spectra

d) Both A and B

6 / 50

6. If the energy of a radiation is 6.63 × 10⁻¹⁰ J, what will be its frequency?

a) 1 × 10⁻⁴⁴ Hz

b) 1 × 10⁴⁴ Hz

c) 1 × 10⁻²⁴ Hz

d) 1 × 10²⁴ Hz

7 / 50

7. Photons are deflected in:

a) Electric field

b) Magnetic field

c) Gravitational field

d) None of these

8 / 50

8. Which of the following is the correct series in the laser principle?

a) Spontaneous absorption, stimulated emission, spontaneous emission, population inversion

b) Stimulated absorption, spontaneous emission, population inversion, stimulated emission

c) Stimulated absorption, spontaneous emission, stimulated emission, population inversion

d) Spontaneous absorption, stimulated emission, population inversion, spontaneous emission

9 / 50

9. A line spectrum formed is a:

a) Absorption spectrum

b) Emission spectrum

c) Can be absorption or emission spectrum

d) Can't be determined

10 / 50

10. In which transition is radiation with the greatest wavelength released?

a) From n₂ to n₁

b) From n₃ to n₁

c) From n₄ to n₁

d) From n₅ to n₁

11 / 50

11. Emission spectra are classified into:

a) Two types

b) Three types

c) Four types

d) Five types

12 / 50

12. What is/are the limitation(s) of Bohr's model?

a) It failed to explain the Zeeman effect

b) It failed to explain the Stark effect

c) It couldn’t explain spectra of large atoms

d) All of these

13 / 50

13. In inner shell transitions of X-rays, the K-beta series is given when the electron jumps from:

a) n = 4 to n = 2

b) n = 3 to n = 2

c) n = 2 to n = 1

d) n = 3 to n = 1

14 / 50

14. Molecules under higher pressure give:

a) Line spectrum

b) Band spectrum

c) Continuous spectrum

d) Any of them depending on temperature

15 / 50

15. What is the kinetic energy of an electron when its total energy is -10 MeV?

a) 2.5 MeV

b) 5 MeV

c) 10 MeV

d) None of these

16 / 50

16. Which of the following is not a property of a photon?

a) Frequency

b) Energy

c) Rest mass

d) Momentum

17 / 50

17. If the frequency of a radiation is doubled, its velocity will:

a) Double

b) Halve

c) Remain the same

d) Can't be determined

18 / 50

18. The uncertainty principle is applied to:

a) Momentum and position

b) Energy and time

c) Energy and position

d) Both A and B

19 / 50

19. Continuous spectrum can be emitted by:

a) Solids

b) Liquids

c) Gases

d) All of these

20 / 50

20. What is the uncertainty in position, if uncertainty in momentum is zero?

a) Zero

b) Infinite

c) Equal to Planck’s constant

d) Can't be determined

21 / 50

21. K-series is formed in inner shell transitions of X-rays when:

a) An electron jumps from the 2nd shell to higher states

b) An electron jumps from higher states to the 2nd shell

c) An electron jumps from the 1st shell to higher states

d) An electron jumps from higher states to the 1st shell

22 / 50

22. Choose the correct statement regarding the hydrogen atom:

a) Energy is directly proportional to n

b) Radius is inversely proportional to n²

c) Energy is inversely proportional to n

d) None of these

23 / 50

23. What is a spectral line?

a) A line of particular frequency emitted or absorbed by an atom

b) A line of particular wavelength emitted or absorbed by an atom

c) A line of particular frequency and wavelength emitted or absorbed by an atom

d) Can't be determined

24 / 50

24. A hydrogen atom consists of:

a) Electron and positron

b) Neutron and proton

c) Electron and proton

d) Electron, proton, and neutron

25 / 50

25. Which one is correct regarding the hydrogen atom?

a) Magnitude of potential energy in an orbit is greater than the magnitude of kinetic energy

b) Magnitude of kinetic energy in an orbit is greater than the magnitude of potential energy

c) Magnitude of kinetic energy in an orbit is equal to the magnitude of potential energy

d) Can't be determined

26 / 50

26. When a metal is illuminated with light of frequency 1 × 10¹⁵ Hz, whose work function is 3.63 × 10⁻¹⁹ J, what will be the maximum kinetic energy of the photoelectrons?

a) . 2 × 10⁻¹⁹ J

b) . 2 × 10⁻¹⁹ J

c) 3 × 10⁻¹⁹ J

d) 3 × 10⁻²⁰ J

27 / 50

27. The Neil Bohr model gives quantitative determination of frequency emitted during:

a) Excitation

b) De-excitation

c) Excitation and de-excitation

d) None of these

28 / 50

28. The centripetal force on an electron revolving around the nucleus is provided by:

a) Gravitational force between electron and nucleus

b) Electrostatic force between electron and nucleus

c) Electromagnetic force between electron and nucleus

d) Gravitational and electrostatic force between electron and nucleus

29 / 50

29. What is the wavelength of radiation whose energy is 6.63 × 10⁸ J?

a) 1 × 10³⁴ m

b) 1 × 10⁻³⁴ m

c) 2 × 10⁻³⁴ m

d) 3 × 10³⁴ m

30 / 50

30. What is the kinetic energy of an electron if potential energy is equal to 5 eV?

a) 10 eV

b) 5 eV

c) 2.5 eV

d) Can’t be determined

31 / 50

31. Radius of an orbit is:

a) Directly proportional to the square of the principal quantum number

b) Directly proportional to the square of the spin quantum number

c) Inversely proportional to the square of the principal quantum number

d) Inversely proportional to the square of the spin quantum number

32 / 50

32. How much energy is required to excite an electron from ground state to infinity level?

a) Infinity

b) Negative infinity

c) Zero

d) Depends on atom

33 / 50

33. X-rays are more powerful electromagnetic radiations than all other except:

a) UV rays

b) Gamma rays

c) IR rays

d) Microwaves

34 / 50

34. Which of the following has the lowest wavelength?

a) UV rays

b) X-rays

c) Gamma rays

d) Visible rays

35 / 50

35. What is the wavelength range of X-rays?

a) 1 nm – 10 nm

b) 1 nm – 100 nm

c) 0.1 nm – 10 nm

d) 0.01 nm – 10 nm

36 / 50

36. Which quantum number(s) are used to determine the energy of an orbital?

a) Magnetic

b) Principal

c) Spin

d) All of these

37 / 50

37. LASER stands for:

a) Light Alteration by Simultaneous Emission of Radiation

b) Light Alteration by Stimulated Emission of Radiation

c) Light Amplification by Simultaneous Emission of Radiation

d) Light Amplification by Stimulated Emission of Radiation

38 / 50

38. What is the key factor to produce laser light?

a) Stimulated emission

b) Stimulated absorption

c) Population inversion

d) All of these

39 / 50

39. Which of the following is not a property of laser light?

a) Monochromatic

b) Coherent

c) Highly intense

d) None of these

40 / 50

40. In spontaneous emission, which factor is not suitable for laser light production?

a) Radiations are polychromatic

b) Radiations are incoherentRadiations are incoherent

c) Radiations are not intense

d) All of these

41 / 50

41. Monochromatic light is light which has:

a) Single colour

b) Single wavelength

c) Both A and B

d) Can’t be determined

42 / 50

42. Energy of the second excited state of a hydrogen atom is:

a) 3.4 eV

b) -3.4 eV

c) 1.5 eV

d) –1.5 eV

43 / 50

43. Laser lights are used in:

a) Holography

b) Medicine

c) Communication

d) All of these

44 / 50

44. X-rays are deflected by:

a) Magnetic field

b) Electric field

c) Gravitational field

d) None of these

45 / 50

45. If an electron jumps from the 3rd to the 2nd orbit, how much energy is released?

a) 13.6 eV

b) 3.4 eV

c) 1.5 eV

d) 0.85 eV

46 / 50

46. Excitation energy is the energy:

a) Required to remove an electron from an atom

b) Required for an electron to move from ground state to higher state

c) Both A and B

d) None of these

47 / 50

47. Ionization potentials of an electron are ----- and excitation potentials are -----

a) Large in number, large in number

b) Limited in number, large in number

c) Large in number, limited in number

d) Limited in number, limited in number

48 / 50

48. Excitation energy of the 5th orbit of a hydrogen atom is:

a) 0.85 eV

b) –0.85 eV

c) 0.54 eV

d) –0.54 eV

49 / 50

49. The value of stopping potential will be zero when frequency of incident radiation is ------ to the threshold frequency:

a) Equal

b) Greater

c) Lesser

d) Stopping potential can never be zero

50 / 50

50. What will be the threshold frequency of a photoelectric material if the work function of that material is 6.63 eV?

a) 1 × 10⁻¹⁹ Hz

b) 1.6 × 10⁻¹⁹ Hz

c) 1 × 10¹⁵ Hz

d) 1.6 × 10¹⁵ Hz

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