PPSC Lecturer of Physics Online Test 32 Past Papers

Leave a Comment / By Hassan / October 17, 2020

Online Free Taleem is free online MCQ’s test related to Lecturer Physics. All the individuals who are going to appear in Lecturer Physics written test can attempt these tests in order to prepare for it in best possible way. Our tests of Lecturer of Physics include all the important questions and Past Paper of Lecturer Physics, that have extremely high amount of chances for been included in the actual exam which make our test undoubtedly the best source of preparation.

Note:-

There will be 25 multiple choice question in the test.
Answer of the questions will change randomly each time you start this test.
Practice this test at least 5 times if you want to secure High Marks.
At the End of the Test you can see your Test score and Rating.
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Test Instructions:-
Test Name	Lecturer Physics
Subject	Physics Test 32
Test Type	MCQs
Total Questions	25
Total Time	20 Minutes
Total Marks	100

You have 20 minutes to pass to the quiz.

PPSC Lecturer of Physics Test 32

1 / 25

When ²³Na (Z = 11) is bombarded with protons, the products are²⁰Ne (Z = 10) and:

an alpha particle

a neutron

a deuteron

two beta particles

a gamma ray particle

2 / 25

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

10−19

1000

0.001

0.1

3 / 25

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

the lowest energy of any electron

the energy at the bottom of the conduction band

the energy of the top of the valence band

the highest energy of any electron

the mean thermal energy of the electrons

4 / 25

For a pure semiconductor the Fermi level is:

in the conduction band

near the center of the gap between the valence and conduction bands

well below the valence band

well above the conduction band

in the valence band

5 / 25

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

the number of replacement atoms

collisions between conduction electrons and atoms

the binding energy of outer shell electrons

the number of electrons in the conduction band

6 / 25

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

gamma ray particles

protons

electrons

deuterons

alpha particles

7 / 25

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

the biological effect of radiation

the ability of a beam of gamma ray photons to produce ions in a target

none of the above

the rate of decay of a radioactive source

the energy delivered by radiation to a target

8 / 25

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

1.5

0.5

1.5

9 / 25

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

none of the above

the biological effect of radiation

the ability of a beam of gamma ray photons to produce ions in a target

the rate of decay of a radioactive source

the energy delivered by radiation to a target

10 / 25

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

7, 2

8, 4

6, 2

6, 3

7, 3

11 / 25

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

a positron

an alpha particle

a proton

an electron

a gamma ray photon

12 / 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:

5.0 × 10−6

0.05

4.1 × 10−9

0.05

13 / 25

The density of states for a metal depends primarily on:

none of these

the energy

the density of the metal

the volume of the sample

the temperature

14 / 25

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

none of the above

collisions between conduction electrons and atoms

the number of electrons in the conduction band

the binding energy of outer shell electrons

the number of impurity atoms

15 / 25

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

Within a given band, all electron energy levels are equal to each other

Only insulators have energy bands

The bands occur as a direct consequence of the Fermi-Dirac occupancy probability function

An insulator has a large energy separation between the highest filled band and the lowest empty band

Electrical conduction arises from the motion of electrons in completely filled bands

16 / 25

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

electrons with energy much less than the Fermi energy and atoms

atoms and other atoms

electrons with energy about equal to the Fermi energy and atoms

electrons and other electrons

all electrons and atoms

17 / 25

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

none of the above

the biological effect of radiation

the energy per unit mass of target delivered by radiation to a target

the rate of decay of a radioactive source

the ability of a beam of gamma ray photons to produce ions in a target

18 / 25

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

0 and infinity

−1 and 1

1 and infinity

0 and 1

0 and EF

19 / 25

The Fermi energy of a metal depends primarily on:

the temperature

the mass density of the metal

the size of the sample

the number density of conduction electrons

the volume of the sample

20 / 25

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

they leave the solid

they make transitions to other bands

they are not moving

the field cannot exert a force on them

the individual contributions cancel each other

21 / 25

A pure semiconductor at room temperature has:

more electrons/m3 in its conduction band than holes/m3 in its valence band

more electrons/m3 in its valence band than at T = 0K

more electrons/m3 in its conduction band than a typical metal

more holes/m3 in its valence band than electrons/m3 in its valence band

none of the above

22 / 25

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

N(E)/P (E)

N(E) + P(E)

P(E)/N(E)

N(E) − P(E)

N(E)P(E)

23 / 25

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

a positron

a neutron

a proton

an electron

an α particle

24 / 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:

0.05

4.1 × 10−9

0.025

5.0 × 10−6

25 / 25

A hole refers to:

an electron that has somehow lost its charge

a positively charged electron

the absence of an electron in an otherwise filled band

a proton

a microscopic defect in a solid

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PPSC Lecturer of Physics Online Test 32 Past Papers

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