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.
If you found any incorrect answer in Quiz. Simply click on the quiz title and comment below on that MCQ. So that I can update the incorrect answer on time.

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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:

a gamma ray particle

a neutron

two beta particles

a deuteron

an alpha particle

2 / 25

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

the individual contributions cancel each other

the field cannot exert a force on them

they are not moving

they leave the solid

they make transitions to other bands

3 / 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)

N(E)P(E)

N(E) + P(E)

P(E)/N(E)

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

in the valence band

well above the conduction band

5 / 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:

8, 4

6, 3

7, 2

7, 3

6, 2

6 / 25

The density of states for a metal depends primarily on:

none of these

the energy

the volume of the sample

the density of the metal

the temperature

7 / 25

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

0.1

1000

10−19

0.001

8 / 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:

5.0 × 10−6

4.1 × 10−9

0.05

0.025

9 / 25

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

0 and infinity

0 and EF

−1 and 1

1 and infinity

0 and 1

10 / 25

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

a proton

a positron

a gamma ray photon

an alpha particle

an electron

11 / 25

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

0.5

1.5

12 / 25

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

the rate of decay of a radioactive source

none of the above

the energy delivered by radiation to a target

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

the biological effect of radiation

13 / 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 proton

an α particle

a positron

a neutron

an electron

14 / 25

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

the binding energy of outer shell electrons

the number of impurity atoms

collisions between conduction electrons and atoms

none of the above

the number of electrons in the conduction band

15 / 25

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

the rate of decay of a radioactive source

none of the above

the biological effect of radiation

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

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

16 / 25

A hole refers to:

a proton

the absence of an electron in an otherwise filled band

a microscopic defect in a solid

an electron that has somehow lost its charge

a positively charged electron

17 / 25

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

the mean thermal energy of the electrons

the energy at the bottom of the conduction band

the highest energy of any electron

the lowest energy of any electron

the energy of the top of the valence band

18 / 25

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

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

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

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

Only insulators have energy bands

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

19 / 25

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

electrons

deuterons

protons

gamma ray particles

alpha particles

20 / 25

A pure semiconductor at room temperature has:

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

none of the above

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

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

21 / 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

electrons with energy about equal to the Fermi energy and atoms

atoms and other atoms

electrons and other electrons

all electrons and atoms

22 / 25

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

the biological effect of radiation

the rate of decay of a radioactive source

none of the above

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

the energy delivered by radiation to a target

23 / 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:

4.1 × 10−9

5.0 × 10−6

0.05

24 / 25

The Fermi energy of a metal depends primarily on:

the volume of the sample

the temperature

the size of the sample

the mass density of the metal

the number density of conduction electrons

25 / 25

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

the number of electrons in the conduction band

the number of replacement atoms

the binding energy of outer shell electrons

collisions between conduction electrons and atoms

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PPSC Lecturer of Physics Online Test 32 Past Papers

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