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PPSC Lecturer of Physics Online Test 29 Past Papers

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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

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

gravitational collapse

chemical reaction

induced emfs associated with the Sun’s magnetic field

nuclear fusion

nuclear fission

2 / 25

The barrier to fusion comes about because protons:

attract neutrons via the strong nuclear force

attract electrons electrically

attract each other via the strong nuclear force

produce magnetic fields

repel each other electrically

3 / 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:

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:

4 / 25

The binding energy per nucleon:

remains the same for some fusion events

increases for some, but not all, fusion events

The binding energy per nucleon:

decreases for some, but not all, fusion events

5 / 25

Fission fragments usually decay by emitting:

positrons and neutrinos

electrons and neutrinos

only neutrons

Fission fragments usually decay by emitting:

only electrons

6 / 25

The barrier to fission comes about because the fragments:

have large masses

repel each other electrically

attract electrons electrically

attract each other via the strong nuclear force

produce magnetic fields

7 / 25

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

the original nucleus just before it absorbs the neutron

the fission products

the original nucleus just before it absorbs the neutron

the control rods

8 / 25

Nuclear fusion in the Sun is increasing its supply of:

hydrogen

positrons

hydrogen

neutrons

9 / 25

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

the isotopes are chemically the same

uranium is the heaviest element in nature

natural uranium contains only 0.7% 235U

mixing other chemicals with uranium is too dangerous

the isotopes have exactly the same number of neutrons per nucleus

10 / 25

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:

the moderating fluid is drained

11 / 25

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

300MeV

3 keV

30MeV

30 keV

3MeV

12 / 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

none of the above

absorb dangerous gamma radiation

shield the reactor operator from dangerous radiation

13 / 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

both be above iron in mass number

have more neutrons than protons

be unstable

14 / 25

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

Silicon (Z = 14, A ≈ 28)

Carbon (Z = 6, A ≈ 12)

Mercury (Z = 80, A ≈ 200)

Chromium (Z = 24, A ≈ 52)

Oxygen (Z = 8, A ≈ 16)

15 / 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 fusion reactions and positive for fission reactions

negative for both fusion and fission reactions

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

positive for fusion reactions and negative for fission reactions

16 / 25

In a subcritical nuclear reactor:

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

17 / 25

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

decrease the energy of the neutrons without absorbing them

increase the ability of the neutrons to cause fission

provide the critical mass for the fission reaction

increase fission by slowing down the neutrons

decrease fission by absorbing neutrons

18 / 25

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

19 / 25

In the uranium disintegration series:

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

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

20 / 25

For a controlled nuclear fusion reaction, one needs:

low number density n and high temperature T

high number density n and temperature T = 0K

low number density n and low temperature T

high number density n and high temperature T

high number density n and low temperature T

21 / 25

High temperatures are required in thermonuclear fusion so that:

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

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

the uncertainty principle can be circumvented

the atoms are ionized

thermal expansion gives the nuclei more room

22 / 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 greater than the electrical power generated

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

must be less than the electrical power generated

23 / 25

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

Fuel

Accelerator

Moderator

24 / 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

25 / 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 about the same number of protons and neutrons

All initial fragments have more protons than 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

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