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.
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 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

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

decrease the energy of the neutrons without absorbing them

decrease fission by absorbing neutrons

increase the ability of the neutrons to cause fission

provide the critical mass for the fission reaction

increase fission by slowing down the neutrons

2 / 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:

1/4

1/2

3 / 25

The barrier to fusion comes about because protons:

repel each other electrically

attract each other via the strong nuclear force

attract electrons electrically

produce magnetic fields

attract neutrons via the strong nuclear force

4 / 25

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

5 / 25

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

positive for both fusion and fission reactions

negative for both fusion and 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 fusion reactions and positive for fission reactions

6 / 25

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

shield the reactor operator from dangerous radiation

none of the above

absorb dangerous gamma radiation

provide neutrons for the fission process

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

7 / 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:

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:

8 / 25

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

Oxygen (Z = 8, A ≈ 16)

Chromium (Z = 24, A ≈ 52)

Silicon (Z = 14, A ≈ 28)

Carbon (Z = 6, A ≈ 12)

Mercury (Z = 80, A ≈ 200)

9 / 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

10 / 25

The binding energy per nucleon:

remains the same for some fusion events

decreases for some, but not all, fusion events

remains the same for some fusion events

increases for some, but not all, fusion events

The binding energy per nucleon:

11 / 25

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

can be made zero by proper design

is not any of the above

must be less than the electrical power generated

must be greater than the electrical power generated

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

12 / 25

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

Fuel

Moderator

Accelerator

Fuel

13 / 25

In the uranium disintegration series:

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

the disintegrating element merely ejects atomic electrons

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

the nucleus always remains unaffected

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

14 / 25

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

be magic number nuclei

have more neutrons than protons

have at least several thousand electron volts of kinetic energy

both be above iron in mass number

be unstable

15 / 25

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

All initial fragments have more protons than neutrons

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

16 / 25

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

induced emfs associated with the Sun’s magnetic field

gravitational collapse

nuclear fusion

nuclear fission

chemical reaction

17 / 25

Nuclear fusion in the Sun is increasing its supply of:

hydrogen

neutrons

positrons

18 / 25

In the normal operation of a nuclear reactor:

none of the above

In the normal operation of a nuclear reactor:

the moderating fluid is drained

In the normal operation of a nuclear reactor:

19 / 25

High temperatures are required in thermonuclear fusion so that:

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

thermal expansion gives the nuclei more room

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

the uncertainty principle can be circumvented

the atoms are ionized

20 / 25

Fission fragments usually decay by emitting:

only neutrons

electrons and neutrinos

only electrons

positrons and neutrinos

Fission fragments usually decay by emitting:

21 / 25

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

3 keV

3MeV

30MeV

300MeV

30 keV

22 / 25

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

natural uranium contains only 0.7% 235U

mixing other chemicals with uranium is too dangerous

the isotopes are chemically the same

the isotopes have exactly the same number of neutrons per nucleus

uranium is the heaviest element in nature

23 / 25

The barrier to fission comes about because the fragments:

produce magnetic fields

attract electrons electrically

attract each other via the strong nuclear force

have large masses

repel each other electrically

24 / 25

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

the original nucleus just before it absorbs the neutron

the control rods

the original nucleus just before it absorbs the neutron

the fission products

25 / 25

For a controlled nuclear fusion reaction, one needs:

high number density n and low temperature T

low number density n and low temperature T

high number density n and high temperature T

high number density n and temperature T = 0K

low number density n and high temperature T

Your score is

The average score is 12%

PPSC Lecturer of Physics Online Test 29 Past Papers

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