PPSC Lecturer of Physics Online Test 29 Past Papers

Leave a Comment / By Hassan / October 14, 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.
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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 29
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 29

1 / 25

Separation of the isotopes of uranium requires a physical, rather than chemical, method because:

mixing other chemicals with uranium is too dangerous

uranium is the heaviest element in nature

the isotopes have exactly the same number of neutrons per nucleus

natural uranium contains only 0.7% 235U

the isotopes are chemically the same

2 / 25

In a nuclear power plant, the power discharged to the environment:

can be entirely recycled to produce an equal amount of electrical power

is not any of the above

must be greater than the electrical power generated

can be made zero by proper design

must be less than the electrical power generated

3 / 25

A nuclear reactor is operating at a certain power level, with its multiplication factor adjusted to unity. The control rods are now used to reduce the power output to one-half its former value. After the reduction in power the multiplication factor is maintained at:

1/2

1/4

4 / 25

For a controlled nuclear fusion reaction, one needs:

low number density n and high temperature T

low number density n and low temperature T

high number density n and temperature T = 0K

high number density n and low temperature T

high number density n and high temperature T

5 / 25

In a nuclear reactor the fissionable fuel is formed into pellets rather than finely ground and the pellets are mixed with the moderator. This reduces the probability of:

In a nuclear reactor the fissionable fuel is formed into pellets rather than finely ground and the pellets are mixed with the moderator. This reduces the probability of:

absorption of two neutrons by single fissionable nucleus

In a nuclear reactor the fissionable fuel is formed into pellets rather than finely ground and the pellets are mixed with the moderator. This reduces the probability of:

absorption of two neutrons by single fissionable nucleus

6 / 25

In a neutron-induced fission process, delayed neutrons come from:

the fission products

the original nucleus just before it absorbs the neutron

the control rods

the original nucleus just before it absorbs the neutron

7 / 25

In a subcritical nuclear reactor:

the number of fission events per unit time decreases with time

each fission event produces more neutrons than when the reactor is critical

the number of fission events per unit time decreases with time

none of the above

the number of fission events per unit time decreases with time

8 / 25

The energy released in a complete proton-proton cycle is about:

3 keV

30MeV

3MeV

300MeV

30 keV

9 / 25

The function of the control rods in a nuclear reactor is to:

increase fission by slowing down the neutrons

increase the ability of the neutrons to cause fission

decrease fission by absorbing neutrons

decrease the energy of the neutrons without absorbing them

provide the critical mass for the fission reaction

10 / 25

For purposes of a practical (energy producing) reaction one wants a disintegration energy Q that is:

negative for fusion reactions and positive for fission reactions

positive for fusion reactions and negative for fission reactions

as close to zero as possible for both fusion and fission reactions

negative for both fusion and fission reactions

positive for both fusion and fission reactions

11 / 25

The binding energy per nucleon:

increases for some, but not all, fusion events

remains the same for some fusion events

The binding energy per nucleon:

decreases for some, but not all, fusion events

12 / 25

High temperatures are required in thermonuclear fusion so that:

there is a high probability some nuclei will strike each other head on

some nuclei are moving fast enough to overcome the barrier to fusion

thermal expansion gives the nuclei more room

the uncertainty principle can be circumvented

the atoms are ionized

13 / 25

In the normal operation of a nuclear reactor:

In the normal operation of a nuclear reactor:

the moderating fluid is drained

none of the above

In the normal operation of a nuclear reactor:

14 / 25

Most of the energy produced by the Sun is due to:

gravitational collapse

nuclear fusion

induced emfs associated with the Sun’s magnetic field

chemical reaction

nuclear fission

15 / 25

The purpose of a moderator in a nuclear reactor is to:

slow down fast neutrons to increase the probability of capture by uranium

provide neutrons for the fission process

absorb dangerous gamma radiation

shield the reactor operator from dangerous radiation

none of the above

16 / 25

The barrier to fission comes about because the fragments:

attract electrons electrically

repel each other electrically

attract each other via the strong nuclear force

produce magnetic fields

have large masses

17 / 25

Which of the following chemical elements is not produced by thermonuclear fusion in stars?

Chromium (Z = 24, A ≈ 52)

Oxygen (Z = 8, A ≈ 16)

Mercury (Z = 80, A ≈ 200)

Silicon (Z = 14, A ≈ 28)

Carbon (Z = 6, A ≈ 12)

18 / 25

In the uranium disintegration series:

the nucleus always remains unaffected

the series of disintegrations continues until an element having eight outermost orbital electrons is obtained

the emission of a β− particle increases the mass number A by one and decreases the atomic number Z by one

the emission of an α particle decreases the mass number A by four and decreases the atomic number Z by two

the disintegrating element merely ejects atomic electrons

19 / 25

To produce energy by fusion of two nuclei, the nuclei must:

have at least several thousand electron volts of kinetic energy

have more neutrons than protons

both be above iron in mass number

be magic number nuclei

be unstable

20 / 25

Nuclear fusion in stars produces all the chemical elements with mass numbers less than:

21 / 25

Nuclear fusion in the Sun is increasing its supply of:

positrons

neutrons

hydrogen

22 / 25

Consider all possible fission events. Which of the following statements is true?

All initial fragments have more neutrons than protons

All initial fragments have about the same number of protons and neutrons

Light initial fragments have more protons than neutrons and heavy initial fragments have fewer protons than neutrons

Heavy initial fragments have more protons than neutrons and light initial fragments have fewer protons than neutrons

All initial fragments have more protons than neutrons

23 / 25

Fission fragments usually decay by emitting:

Fission fragments usually decay by emitting:

only electrons

positrons and neutrinos

electrons and neutrinos

only neutrons

24 / 25

The barrier to fusion comes about because protons:

attract electrons electrically

attract each other via the strong nuclear force

produce magnetic fields

attract neutrons via the strong nuclear force

repel each other electrically

25 / 25

Which one of the following is NOT needed in a nuclear fission reactor?

Fuel

Accelerator

Fuel

Moderator

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PPSC Lecturer of Physics Online Test 29 Past Papers

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