ppsc Physics lecturer past papers with answers pdf

PPSC Lecturer of Physics Online Test 30 Past Papers

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Test Instructions:-
Test Name	Lecturer Physics
Subject	Physics Test 30
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 30

1 / 25

Let Z denote the atomic number and A denote the mass number of a nucleus. The number of neutrons in this nucleus is:

2A − Z

A − 2Z

A − Z

2 / 25

Most magnetic confinement projects attempt:

deuteron-deuteron fusion

triton-triton fusion

proton-proton fusion

proton-deuteron fusion

deuteron-triton fusion

3 / 25

Two protons are about 10⁻¹⁰ m apart. Their relative motion is chiefly determined by:

nuclear forces

gravitational forces

nuclear forces

gravitational forces

4 / 25

The greatest binding energy per nucleon occurs for nuclides with masses near that of:

iron

helium

sodium

iron

5 / 25

The atomic number of an element is:

The atomic number of an element is:

6 / 25

The half-life of a radioactive substance is:

the time for half the substance to decay

usually about 50 years

calculated from E = mc2

the time for radium to change into lead

half the time it takes for the entire substance to decay

7 / 25

Lawson’s number is 10²⁰ s ·m−³. If the density of deuteron nuclei is 2 × 10²¹ m⁻³ what should the confinement time be to achieve sustained fusion?

160 ms

250 ms

500 ms

50 ms

16 ms

8 / 25

The mass of an electron:

The mass of an electron:

9 / 25

Iron has atomic number 26. Naturally mined iron contains isotopes of mass numbers 54, 56, 57, and 58. Which of the following statements is FALSE?

Some iron atoms have 54 neutrons

Every atom of iron has 26 protons

There are four kinds of naturally occurring iron atoms with the same chemical properties ans: C

Every atom of iron has 26 protons

Some iron atoms have 54 neutrons

10 / 25

Most laser fusion projects attempt:

deuteron-triton fusion

deuteron-deuteron fusion

triton-triton fusion

proton-proton fusion

proton-deuteron fusion

11 / 25

Which of the following particles is stable?

Neutron

Kaon

Neutron

Muon

Pion

12 / 25

The binding energy of a nucleus is the energy that must be supplied to:

remove a beta particle

remove an alpha particle

separate the nucleus into its constituent nucleons

remove a nucleon

separate the nucleus into its constituent nucleons

13 / 25

The smallest particle of any chemical element that can exist by itself and yet retain the qualities that distinguish it as that element is:

an electron

14 / 25

The mass of an electron:

The mass of an electron:

15 / 25

Of the following, which has the smallest rest energy?

A neutron

16 / 25

Two protons are separated by 10−16 m. The nuclear (N), electrostatic (E), and gravitational (G) forces between these protons, in order of increasing strength, are:

N, G, E

E, G, N

N, G, E

E, N, G

G, N, E

17 / 25

Bromine, with atomic mass 79.942 u, is composed of nearly equal amounts of two isotopes, one of which contains 79 nucleons per atom. The mass number of the other isotope is:

18 / 25

A nucleus with a mass number of 64 has a mean radius of about:

19 fm

4.8 fm

19 fm

260 fm

2.6 × 105 fm

19 / 25

A proton in a large nucleus:

attracts all other protons

repels all neutrons

attracts all other protons

repels all neutrons

20 / 25

The isotopes of an element:

have similar chemical behavior

cannot be separated at all

21 / 25

Compared to fusion in a tokamak, laser fusion makes use of:

longer confinement times

lower temperatures

smaller particle number densities

higher temperatures

greater particle number densities

22 / 25

Stable nuclei generally:

have low mass numbers

have high mass numbers

are beta emitters

have a greater number of protons than neutrons

none of the above

23 / 25

Volumes of atomic nuclei are proportional to:

the mass number

the total nuclear spin

the number of neutrons

the mass number

the number of neutrons

24 / 25

In laser fusion, the laser light is:

emitted by the reacting nuclei

used to replace the emitted gamma rays

used to cause transitions between nuclear energy levels

used to cause transitions between atomic energy levels

used to heat the fuel pellet

25 / 25

Tokamaks confine deuteron plasmas using:

laser beams

vacuum tubes

thick steel walls

electric fields

magnetic fields

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