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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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

Nuclear fusion in the Sun is increasing its supply of:

positrons

neutrons

hydrogen

2 / 25

For a controlled nuclear fusion reaction, one needs:

low number density n and low temperature T

low number density n and high temperature T

high number density n and high temperature T

high number density n and temperature T = 0K

high number density n and low temperature T

3 / 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

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

must be less than the electrical power generated

must be greater than the electrical power generated

4 / 25

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

the isotopes have exactly the same number of neutrons per nucleus

natural uranium contains only 0.7% 235U

the isotopes are chemically the same

mixing other chemicals with uranium is too dangerous

uranium is the heaviest element in nature

5 / 25

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

3 keV

30 keV

3MeV

30MeV

300MeV

6 / 25

The barrier to fission comes about because the fragments:

repel each other electrically

produce magnetic fields

attract electrons electrically

have large masses

attract each other via the strong nuclear force

7 / 25

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

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

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

All initial fragments have more neutrons than protons

8 / 25

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

positive for fusion reactions and negative for fission reactions

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

positive for both fusion and fission reactions

negative for fusion reactions and positive for fission reactions

negative for both fusion and fission reactions

9 / 25

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

have at least several thousand electron volts of kinetic energy

be magic number nuclei

have more neutrons than protons

both be above iron in mass number

be unstable

10 / 25

High temperatures are required in thermonuclear fusion so that:

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

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

11 / 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

12 / 25

In the normal operation of a nuclear reactor:

none of the above

the moderating fluid is drained

In the normal operation of a nuclear reactor:

the moderating fluid is drained

In the normal operation of a nuclear reactor:

13 / 25

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

shield the reactor operator from dangerous radiation

provide neutrons for the fission process

none of the above

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

absorb dangerous gamma radiation

14 / 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

15 / 25

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

provide the critical mass for the fission reaction

decrease fission by absorbing neutrons

increase the ability of the neutrons to cause fission

increase fission by slowing down the neutrons

decrease the energy of the neutrons without absorbing them

16 / 25

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

induced emfs associated with the Sun’s magnetic field

nuclear fusion

chemical reaction

nuclear fission

gravitational collapse

17 / 25

Fission fragments usually decay by emitting:

electrons and neutrinos

positrons and neutrinos

only electrons

Fission fragments usually decay by emitting:

only neutrons

18 / 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

none of the above

the number of fission events per unit time decreases with time

19 / 25

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

Carbon (Z = 6, A ≈ 12)

Chromium (Z = 24, A ≈ 52)

Oxygen (Z = 8, A ≈ 16)

Mercury (Z = 80, A ≈ 200)

Silicon (Z = 14, A ≈ 28)

20 / 25

The barrier to fusion comes about because protons:

produce magnetic fields

repel each other electrically

attract neutrons via the strong nuclear force

attract electrons electrically

attract each other via the strong nuclear force

21 / 25

The binding energy per nucleon:

The binding energy per nucleon:

decreases for some, but not all, fusion events

increases for some, but not all, fusion events

remains the same for some fusion events

22 / 25

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

the original nucleus just before it absorbs the neutron

the fission products

the control rods

23 / 25

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

Fuel

Moderator

Accelerator

24 / 25

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

25 / 25

In the uranium disintegration series:

the disintegrating element merely ejects atomic electrons

the nucleus always remains unaffected

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

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

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

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PPSC Lecturer of Physics Online Test 29 Past Papers

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