# PPSC Lecturer of Physics Online Test 34 Past Papers

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 Test Instructions:- Test Name Lecturer PhysicsÂ Subject Physics Test 34 Test Type MCQs Total Questions 25 Total Time 20 Minutes Total Marks 100
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You have 20 minutes to pass to the quiz.

PPSC Lecturer of Physics Test 34

1 / 25

The Pauli exclusion principle is obeyed by:

2 / 25

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

3 / 25

A laser must be pumped to achieve:

4 / 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:

5 / 25

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

6 / 25

In a laser:

7 / 25

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

8 / 25

The minimum energy principle tells us that:

9 / 25

The KÎ± 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 KÎ± x rays with a wavelength one-third as great
(â‰ˆ 60pm) is:

10 / 25

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

11 / 25

Characteristic K x-radiation of an element occurs when:

12 / 25

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

13 / 25

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

14 / 25

Which of the following subshells cannot exist?

15 / 25

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

16 / 25

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

17 / 25

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

18 / 25

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

19 / 25

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

20 / 25

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

21 / 25

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

22 / 25

In a Moseley graph:

23 / 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:

24 / 25

In connection with x-ray emission the symbol LÎ² refers to:

25 / 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: