PPSC Lecturer of Physics Online Test 34 Past Papers

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Test Instructions:-
Test NameLecturer Physics 
SubjectPhysics Test 34
Test TypeMCQs
Total Questions25
Total Time20 Minutes
Total Marks100
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You have 20 minutes to pass to the quiz.


PPSC Lecturer of Physics Test 34

1 / 25

The minimum energy principle tells us that:

2 / 25

Suppose the energy required to ionize an argon atom is i, the energy to excite it is e, and its thermal energy at room temperature is t. In increasing order, these three energies are:

3 / 25

Radiation with the minimum wavelength as well as the K x-ray lines are detected for a certain target. The energy of the incident electrons is then doubled, with the result that:

4 / 25

Which of the following subshells cannot exist?

5 / 25

The ratio of the wavelength of the Kα x-ray line for Nb (Z = 41) to that of Ga (Z = 31) is:

6 / 25

In calculating the x-ray energy levels the effective charge of the nucleus is taken to be Z − b, where Z is the atomic number. The parameter b enters because:

7 / 25

Two different electron beams are incident on two different targets and both produce x rays. The cutoff wavelength for target 1 is shorter than the cutoff wavelength for target 2. We can conclude that:

8 / 25

In a Moseley graph:

9 / 25

In a laser:

10 / 25

In connection with x-ray emission the symbol Kα refers to:

11 / 25

The effective charge acting on a single valence electron outside a closed shell is about Ne, where N is:

12 / 25

For any atom other than hydrogen and helium all electrons in the same shell have:

13 / 25

In connection with x-ray emission the symbol Lβ refers to:

14 / 25

A photon with the smallest wavelength in the continuous z-ray spectrum is emitted when:

15 / 25

Photons in a laser beam have the same energy, wavelength, polarization direction, and phase because:

16 / 25

No state in an atom can be occupied by more than one electron. This is most closely related to:

17 / 25

A laser must be pumped to achieve:

18 / 25

The group of atoms at the beginning of periods of the periodic table are called:

19 / 25

The Kα x rays arising from a cobalt (Z = 27) target have a wavelength of about 179pm. The atomic number of a target that gives rise to Kα x rays with a wavelength one-third as great
(≈ 60pm) is:

20 / 25

The ionization energy of an atom in its ground state is:

21 / 25

Characteristic K x-radiation of an element occurs when:

22 / 25

The most energetic photon in a continuous x-ray spectrum has an energy approximately equal to:

23 / 25

The Pauli exclusion principle is obeyed by:

24 / 25

An electron in an L shell of an atom has the principal quantum number:

25 / 25

The group of atoms at the ends of periods of the periodic table are called:

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