XII Physics Atomic Spectra and Nuclear Radiations Online test Mdcat-2024

XII physics Atomic spectra and Nuclear radiations online test
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Instructions for Chapter Atomic Spectra and Nuclear Radiations Online Test Mdcat-2024:

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    Test Details:

      • Subject: Physics
      • Class: 2nd year or 12
      • Chapter name: Atomic Spectra and Nuclear Radiations
      • Test: MDCAT 2024
      • Book: Sindh Textbook
      • Total No. Of MCQS: 50
      • Time Allowed: 50 Minutes
      • Price : Free
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      XII physics Atomic spectra and Nuclear radiations online test Mdcat-2024

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      1 / 50

      1. Photons of the highest frequency will be absorbed when the transition takes place from

      2 / 50

      2. Ground state energy of the 4th orbit in a H-atom is

      3 / 50

      3. Hydrogen atom does not emit X-rays because

      4 / 50

      4. The correct order of Bohr radius is

      5 / 50

      5. The energy of an electron in a hydrogenic atom with nuclear charge Z varies as

      6 / 50

      6. According to classical theory, the proposed circular path of an electron in Rutherford's model of the atom will be

      7 / 50

      7. Electrons in the atom are held in the atom due to

       

      8 / 50

      8. Potential energy of an electron in nth orbit is given as:hjhkjk

      9 / 50

      9. Estimation and detection of elements in any mixture by subjecting thermal neutrons is known as:

      10 / 50

      10. Half-life of C¹⁴ isotope of carbon is:

      11 / 50

      11. Rays which are used for holographic functions:

      12 / 50

      12. Gamma rays are typically made up of:

      13 / 50

      13. Isotope used for the treatment of thyroid cancer:

      14 / 50

      14. Lung cancer is mainly treated with a radioactive isotope:

      15 / 50

      15. Rate of blood flow in our body is traced by isotopes of:

      16 / 50

      16. The effect of open radiation is that they produce:

      17 / 50

      17. When a red-hot tube is supplied with voltage, it emits ____ and the phenomenon is called ____.

      18 / 50

      18. When gamma rays come in contact with matter and lose some part of its energy, it is known as:

      19 / 50

      19. Very energetic alpha particles are emitted by:

      20 / 50

      20. Gamma rays are made up of:

      21 / 50

      21. Mass of protons as compared to alpha particles is:

      22 / 50

      22. Velocity with which alpha particles shoot out from a nucleus:

      23 / 50

      23. Originally, beta particles are made up of:

      24 / 50

      24. The radius of the 1st orbit of a hydrogen atom is 0.53 Å, then the radius of the fifth state of the hydrogen atom is:

      25 / 50

      25. The amount of energy needed to transfer an electron from the first orbit to the third orbit is:

      26 / 50

      26. The ratio of radii of the first three Bohr orbits is:

      27 / 50

      27. The value of the third ground state energy “E3” is given as:

      28 / 50

      28. When an electron in a hydrogen atom jumps from a higher orbit into the third orbit, the set of lines emitted is called:

      29 / 50

      29. Whenever a hydrogen atom emits a photon in the Balmer series:

      30 / 50

      30. When an electron makes a transition from the ground state to an excitation state then

      31 / 50

      31. The radius of the second orbit of a hydrogen atom is R, the radius of the third orbit will be:

      32 / 50

      32. The electron of hydrogen atoms is in the 3rd orbit, then how many different series it can emit:

      33 / 50

      33. Balmer series lies in:

      34 / 50

      34. Production of x-rays is a reverse phenomenon of:

      35 / 50

      35. The first ground state energy “E1” is given as _______:

      36 / 50

      36. If an electron moves about its own orbits then its total energy:

      37 / 50

      37. Lyman series lies in _______:

      38 / 50

      38. Which of the following is correct about x-rays?

      I) Energy range of x-rays lie between 1 to 100 KeV

      II) Wavelength of x-rays lie between 1nm to 10nm

      III) X-rays are produced when electrons accelerated through thousands of p.d are slowed down

      IV) X-rays are produced due to inner shell transition of electrons of target material

      39 / 50

      39. Characteristic x-rays of K-series are obtained when the electron transits to:

      40 / 50

      40. The lifetime of an electron in a metastable state is of the order of:

      41 / 50

      41. The nature of X-rays is:

      42 / 50

      42. The spectrum of x-rays is

      43 / 50

      43. Minimum energy required to ionize an atom is called:

      44 / 50

      44. The ratio of radii of the first stable orbit in the hydrogen atom to the second stable orbit is:

      45 / 50

      45. The spectrum formed by the transition of an electron of gas from a higher orbit to a lower orbit is:

      46 / 50

      46. According to Bohr’s theory of the hydrogen atom, it can be concluded that the radius of stable orbits is proportional to:

      47 / 50

      47. The spectrum of light emitted by molecules is:

      48 / 50

      48. In a hydrogen atom, when the electron jumps from n=4 to n=2 orbit, the wavelength of emitted radiation is:

      49 / 50

      49. The shortest wavelength in the Lyman series is 911.6 𝑨°, longest wavelength in the same series will be:

      50 / 50

      50. According to Bohr’s theory, an atom emits light when:

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