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Magnetic Effect Of Current And Magnetism

192 Questions Start Allen Test
All Exams Allen
Q101 Allen 8. MAGNETIC PROPERTIES OF MATERIALS MCQ
The relative permeability of air is:
A.
Zero
B.
1.04
C.
Infinity
D.
1
Q102 Allen 8. MAGNETIC PROPERTIES OF MATERIALS MCQ
If the magnetic susceptibility of a magnetic material is -0.004 then its nature will be :-
A.
Diamagnetic
B.
Paramagnetic
C.
Ferromagnetic
D.
Non magnetic
Q103 Allen 8. MAGNETIC PROPERTIES OF MATERIALS MCQ
The correct measure of magnetic hardness of a material is :-
A.
Remanent magnetism
B.
Hysteresis loss
C.
Coercivity
D.
Curie temperature
Q104 Allen 8. MAGNETIC PROPERTIES OF MATERIALS MCQ
If the relative permeability of a material is 0.9999 then its nature will be :-
A.
Paramagnetic
B.
Diamagnetic
C.
Ferromagnetic
D.
Non-magnetic
Q105 Allen 8. MAGNETIC PROPERTIES OF MATERIALS MCQ
The magnetic susceptibility of a paramagnetic material at $-73^{\circ}C$ is 0.0075 then its value at $-173^{\circ}C$ will be :-
A.
0.0045
B.
0.0030
C.
0.015
D.
0.0075
Q106 Allen 8. MAGNETIC PROPERTIES OF MATERIALS MCQ
When a magnetic substance is heated, then it:
A.
Becomes a strong magnet
B.
Losses its magnetism
C.
Does not effect the magnetism
D.
Either (1) or (3)
Q107 Allen 8. MAGNETIC PROPERTIES OF MATERIALS MCQ
Diamagnetic substance are :-
A.
Feebly attracted by magnets
B.
Strongly attracted by magnets
C.
Feebly repelled by magnets
D.
Strongly repelled by magnets
Q108 Allen 8. MAGNETIC PROPERTIES OF MATERIALS MCQ
If a diamagnetic solution is poured into a U-tube and one arm of this U-tube placed between the poles of a strong magnet with the meniscus in a line with the field, then the level of the solution will :-
A.
Rise
B.
Fall
C.
Oscillate slowly
D.
Remain as such
Q109 Allen 8. MAGNETIC PROPERTIES OF MATERIALS MCQ
Magnetic permeability is maximum for :
A.
Diamagnetic substance
B.
Paramagnetic substance
C.
Ferromagnetic substance
D.
All of these
Q110 Allen 8. MAGNETIC PROPERTIES OF MATERIALS MCQ
Which one of the following is ferro-magnetic:-
A.
Co
B.
Zn
C.
Hg
D.
Pt
Q111 Allen 8. MAGNETIC PROPERTIES OF MATERIALS MCQ
For paramagnetic materials magnetic susceptibility is related with temperature as:
A.
$\propto$ T $^{2}$
B.
$\propto$ T $^{1}$
C.
$\propto$ T $^{-1}$
D.
$\propto$ T $^{-2}$
Q112 Allen 8. MAGNETIC PROPERTIES OF MATERIALS MCQ
According to Curie's law, the magnetic susceptibility of a substance at an absolute temperature T is proportional to:
A.
1/T
B.
T
C.
$1 / \mathrm{T}^2$
D.
$\mathrm{T}^2$
Q113 Allen 8. MAGNETIC PROPERTIES OF MATERIALS MCQ
A diamagnetic material in a magnetic field moves
A.
from stronger to the weaker parts of the field
B.
from weaker to the stronger parts of the field
C.
perpendicular to the field
D.
in none of the above directions
Q114 Allen 8. MAGNETIC PROPERTIES OF MATERIALS MCQ
Diamagnetic substances characterise by :-
A.
low and negative magnetic susceptibility
B.
low and positive magnetic susceptibility
C.
high and negative magnetic susceptibility
D.
high and positive magnetic susceptibility
Q115 Allen 8. MAGNETIC PROPERTIES OF MATERIALS MCQ
Magnetic susceptibility of a diamagnetic substance varies with absolute temperature as :-
A.
directly proportional to T
B.
inversely proportional to T
C.
remains unchanged with T
D.
exponential decrease with T
Q116 Allen 8. MAGNETIC PROPERTIES OF MATERIALS MCQ
The material of permanent magnet has
A.
High retentivity, low coercivity
B.
Low retentivity, high coercivity
C.
Low retentivity, low coercivity
D.
High retentivity, high coercivity
Q117 Allen 8. MAGNETIC PROPERTIES OF MATERIALS MCQ
Hysteresis property is shown by :-
A.
paramagnetic and diamagnetic
B.
diamagnetic
C.
paramagnetic
D.
ferromagnetic
Q118 Allen 8. MAGNETIC PROPERTIES OF MATERIALS MCQ
Magnetic susceptibility of the following is :
A.
negative for diamagnetic
B.
positive for diamagnetic and paramagnetic
C.
negative for diamagnetic and zero for paramagnetic
D.
zero for paramagnetic and positive for ferromagnetic
Q119 Allen 8. MAGNETIC PROPERTIES OF MATERIALS MCQ
Which statement is true:
A.
atomic magnetic dipole moment of diamagnet is zero
B.
atomic magnetic dipole moment of paramagnet is zero
C.
atomic magnetic dipole moment of ferromagnet is zero
D.
ferromagnet is demagnetised rapidly after moving in magnetising field.
Q120 Allen 8. MAGNETIC PROPERTIES OF MATERIALS MCQ
Curie-Weiss law is obeyed by iron at a temperature......
A.
Below Curie temperature
B.
Above Curie temperature
C.
At Curie temperature only
D.
At all temperatures
Q121 Allen 8. MAGNETIC PROPERTIES OF MATERIALS MCQ
Ferromagnetic substance contain :-
A.
empty subshell
B.
partially empty subshell
C.
full fill subshell
D.
none of these
Q122 Allen 8. MAGNETIC PROPERTIES OF MATERIALS MCQ
Soft iron is used to make the core of transformer, because of its:
A.
low coercivity and low retentivity
B.
low coercivity and high retentivity
C.
high coercivity and high retentivity
D.
high coercivity and low retentivity
Q123 Allen 8. MAGNETIC PROPERTIES OF MATERIALS MCQ
Above curie temperature ferromagnetic substance converts into:
A.
paramagnetic
B.
diamagnetic
C.
ferromagnetic
D.
non magnetic
Q124 Allen 8. MAGNETIC PROPERTIES OF MATERIALS MCQ
Relation between $\mu_{\mathrm{r}}$ and $\chi$ will be:
A.
$\mu_{\mathrm{r}} = 1 + \chi$
B.
$\chi = \mu_{\mathrm{r}} + 1$
C.
$\frac{\mu_0}{\mu}$
D.
$\mu_0\chi$
Q125 Allen 9. PYQ MCQ
Two identical long conducting wires AOB and COD are placed at right angle to each other, with one above other such that 'O' is their common point for the two. The wires carry $\mathrm{I}_1$ and $\mathrm{I}_2$ currents respectively. Point 'P' is lying at distance 'd' from 'O' along a direction perpendicular to the plane containing the wires. The magnetic field at the point 'P' will be :-
A.
$\frac{\mu_0}{2\pi d}\left(\frac{\mathrm{I}_1}{\mathrm{I}_2}\right)$
B.
$\frac{\mu_0}{2\pi d} (\mathrm{I}_1 + \mathrm{I}_2)$
C.
$\frac{\mu_0}{2\pi d} (\mathrm{I}_1^2 -\mathrm{I}_2^2)$
D.
$\frac{\mu_0}{2\pi d} (\mathrm{I}_1^2 +\mathrm{I}_2^2)^{1 / 2}$