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

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?

500 ms

160 ms

50 ms

250 ms

16 ms

2 / 25

Most laser fusion projects attempt:

deuteron-triton fusion

proton-proton fusion

proton-deuteron fusion

deuteron-deuteron fusion

triton-triton fusion

3 / 25

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

A − Z

A − 2Z

2A − Z

4 / 25

The mass of an electron:

The mass of an electron:

5 / 25

The mass of an electron:

The mass of an electron:

6 / 25

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

separate the nucleus into its constituent nucleons

remove an alpha particle

remove a nucleon

separate the nucleus into its constituent nucleons

remove a beta particle

8 / 25

9 / 25

Volumes of atomic nuclei are proportional to:

the number of neutrons

the total nuclear spin

the mass number

10 / 25

11 / 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?

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

Every atom of iron has 26 protons

Some iron atoms have 54 neutrons

12 / 25

The atomic number of an element is:

The atomic number of an element is:

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

A proton in a large nucleus:

repels all neutrons

attracts all other protons

repels all neutrons

15 / 25

The isotopes of an element:

have similar chemical behavior

cannot be separated at all

have similar chemical behavior

cannot be separated at all

have similar chemical behavior

16 / 25

Most magnetic confinement projects attempt:

proton-deuteron fusion

triton-triton fusion

deuteron-deuteron fusion

deuteron-triton fusion

proton-proton fusion

17 / 25

In laser fusion, the laser light is:

used to replace the emitted gamma rays

used to cause transitions between atomic energy levels

used to heat the fuel pellet

emitted by the reacting nuclei

used to cause transitions between nuclear energy levels

18 / 25

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

greater particle number densities

longer confinement times

higher temperatures

smaller particle number densities

lower temperatures

19 / 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:

20 / 25

Stable nuclei generally:

none of the above

have a greater number of protons than neutrons

are beta emitters

have low mass numbers

have high mass numbers

21 / 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:

E, N, G

N, G, E

E, G, N

G, N, E

N, G, E

23 / 25

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

nuclear forces

gravitational forces

nuclear forces

gravitational forces

25 / 25

The half-life of a radioactive substance is:

usually about 50 years

the time for half the substance to decay

the time for radium to change into lead

calculated from E = mc2

half the time it takes for the entire substance to decay

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