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

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

the biological effect of radiation

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

2 / 25

The becquerel 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

3 / 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

0.05

5.0 × 10−6

0.05

4 / 25

A hole refers to:

a proton

the absence of an electron in an otherwise filled band

an electron that has somehow lost its charge

a microscopic defect in a solid

a positively charged electron

5 / 25

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

the energy delivered by radiation to a target

the biological effect of radiation

none of the above

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

the rate of decay of a radioactive source

6 / 25

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

1000

0.1

0.001

10−19

7 / 25

The density of states for a metal depends primarily on:

the density of the metal

none of these

the volume of the sample

the energy

the temperature

8 / 25

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

the binding energy of outer shell electrons

collisions between conduction electrons and atoms

none of the above

the number of electrons in the conduction band

the number of impurity atoms

9 / 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

they leave the solid

they are not moving

they make transitions to other bands

the field cannot exert a force on them

10 / 25

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

collisions between conduction electrons and atoms

the number of replacement atoms

the number of electrons in the conduction band

the binding energy of outer shell electrons

11 / 25

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

a positron

a gamma ray photon

a proton

an electron

an alpha particle

12 / 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 and other electrons

atoms and other atoms

electrons with energy much less than the Fermi energy and atoms

all electrons and atoms

electrons with energy about equal to the Fermi energy and atoms

13 / 25

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

electrons

alpha particles

deuterons

gamma ray particles

protons

14 / 25

The Fermi energy of a metal depends primarily on:

the number density of conduction electrons

the mass density of the metal

the volume of the sample

the temperature

the size of the sample

15 / 25

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

1.5

0.5

1.5

16 / 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)

17 / 25

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

−1 and 1

0 and infinity

0 and EF

0 and 1

1 and infinity

18 / 25

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

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

Only insulators have energy bands

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

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

19 / 25

For a pure semiconductor the Fermi level is:

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

well below the valence band

in the valence band

in the conduction band

well above the conduction band

20 / 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:

an electron

an α particle

a positron

a neutron

a proton

21 / 25

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

a deuteron

a neutron

two beta particles

a gamma ray particle

an alpha particle

22 / 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

6, 2

8, 4

7, 3

6, 3

23 / 25

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

the highest energy of any electron

the lowest energy of any electron

the energy of the top of the valence band

the mean thermal energy of the electrons

the energy at the bottom of the conduction band

24 / 25

A pure semiconductor at room temperature has:

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

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

none of the above

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

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

25 / 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

0.05

4.1 × 10−9

0.025

Your score is

The average score is 0%

PPSC Lecturer of Physics Online Test 32 Past Papers

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