# PPSC Lecturer of Physics Online Test 33 Past Papers

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 Test Instructions:- Test Name Lecturer Physics Subject Physics Test 33 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.

You have 20 minutes to pass to the quiz.

PPSC Lecturer of Physics Test 33

1 / 25

A certain material has a resistivity of 7.8×10−8 Ω ·m at room temperature and it increases as the temperature is raised by 100◦ C. The material is most likely:

2 / 25

The gap between the valence and conduction bands of a certain semiconductor is 0.85 eV. When this semiconductor is used to form a light emitting diode, the wavelength of the light emitted:

3 / 25

A light emitting diode emits light when:

4 / 25

The number of states in a shell with principal quantum number n = 3 is:

5 / 25

A certain material has a resistivity of 7.8 × 103 Ω · m at room temperature and it decreases as the temperature is raised by 100◦ C. The material is most likely:

6 / 25

When a forward bias is applied to a p-n junction the concentration of electrons on the p side:

7 / 25

A certain material has a resistivity of 7.8 × 103 Ω · m at room temperature and it increases as the temperature is raised by 100◦ C. The material is most likely:

8 / 25

The contact electric field in the depletion region of a p-n junction is produced by:

9 / 25

Application of a forward bias to a p-n junction:

10 / 25

Acceptor atoms introduced into a pure semiconductor at room temperature:

11 / 25

The quantum number ms is most closely associated with what property of the electron in an atom?

12 / 25

Donor atoms introduced into a pure semiconductor at room temperature:

13 / 25

Application of a forward bias to a p-n junction:

14 / 25

The magnetic quantum number m􀁦 is most closely associated with what property of an electron in an atom?

15 / 25

In normal operation the current in a MOSFIT device is controlled by changing:

16 / 25

For an unbiased p-n junction, the energy at the bottom of the conduction band on the n side is:

17 / 25

A donor replacement atom in silicon might have ......................electrons in its outer shell:

18 / 25

A given doped semiconductor can be identified as p or n type by:

19 / 25

The Stern-Gerlach experiment makes use of:

20 / 25

To observe the Zeeman effect one uses:

21 / 25

“LED” stands for:

22 / 25

Which of the following is NOT true when a back bias is applied to a p-n junction?

23 / 25

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

24 / 25

An acceptor replacement atom in silicon might have.................... electrons in its outer shell:

25 / 25

In an unbiased p-n junction: