# PPSC Lecturer of Physics Online Test 32 Past Papers

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 Test Instructions:- Test Name Lecturer PhysicsÂ Subject Physics Test 32 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 32

1 / 25

In a pure metal the collisions that are characterized by the mean free time Ï„ in the expression for the resistivity are chiefly between:

2 / 25

The Fermi-Dirac occupancy probability P(E) varies between:

3 / 25

A pure semiconductor at room temperature has:

4 / 25

When ordinary sulfur, 32S (Z = 16), is bombarded with neutrons, the products are 32P (Z = 15) and:

5 / 25

The Fermi energy of a metal depends primarily on:

6 / 25

The occupancy probability for a state with energy equal to the Fermi energy is:

7 / 25

At room temperature kT is about 0.0259 eV. The probability that a state 0.50 eV below the Fermi level is unoccupied at room temperature is:

8 / 25

A hole refers to:

9 / 25

The 66Cu (Z = 29) produced in a nuclear bombardment is unstable, changing to 66Zn (Z = 30) by the emission of:

10 / 25

For a metal at room temperature the temperature coefficient of resistivity is determined primarily by:

11 / 25

For a pure semiconductor at room temperature the temperature coefficient of resistivity is determined primarily by:

12 / 25

The energy gap (in eV) between the valence and conduction bands of an insulator is of the order of:

13 / 25

The gray is the correct unit to use in reporting the measurement of:

14 / 25

The density of states for a metal depends primarily on:

15 / 25

When 23Na (Z = 11) is bombarded with protons, the products are 20Ne (Z = 10) and:

16 / 25

Which one of the following statements concerning electron energy bands in solids is true?

17 / 25

The sievert is the correct unit to use in reporting the measurement of:

18 / 25

For a pure semiconductor the Fermi level is:

19 / 25

A certain nucleus, after absorbing a neutron, emits a Î²âˆ’ and then splits into two alpha particles. The (A,Z) of the original nucleus must have been:

20 / 25

At room temperature kT is about 0.0259 eV. The probability that a state 0.50 eV above the Fermi level is occupied at room temperature is:

21 / 25

Aluminum has atomic number 13, helium has atomic number 2, and silicon has atomic number 14. In the nuclear reaction 27Al + 4He â†’ 30Si + ( ) the missing particle is:

22 / 25

If the density of states is N(E) and the occupancy probability is P(E), then the density of occupied states is:

23 / 25

The becquerel is the correct unit to use in reporting the measurement of:

24 / 25

Electrons in a full band do not contribute to the current when an electric field exists in a solid because:

25 / 25

In a metal at 0K, the Fermi energy is: