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question_answer1)
Magnets cannot be made from which of the following substances [Bihar PET 1984]
A)
Iron done
clear
B)
Nickel done
clear
C)
Copper done
clear
D)
All of the above done
clear
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question_answer2)
The magnetic moment of atomic neon is [NCERT 1984]
A)
Zero done
clear
B)
\[\mu B/2\] done
clear
C)
\[\mu B\] done
clear
D)
\[3\mu B/2\] done
clear
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question_answer3)
Which of the following is most suitable for the core of electromagnets [AIIMS 1980; NCERT 1980; AFMC 1988; CBSE PMT 1990]
A)
Soft iron done
clear
B)
Steel done
clear
C)
Copper-nickel alloy done
clear
D)
Air done
clear
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question_answer4)
Demagnetisation of magnets can be done by [DPMT 1984; CBSE PMT 1988]
A)
Rough handling done
clear
B)
Heating done
clear
C)
Magnetising in the opposite direction done
clear
D)
All the above done
clear
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question_answer5)
A ferromagnetic material is heated above its curie temperature. Which one is a correct statement [MP PET 1995]
A)
Ferromagnetic domains are perfectly arranged done
clear
B)
Ferromagnetic domains becomes random done
clear
C)
Ferromagnetic domains are not influenced done
clear
D)
Ferromagnetic material changes itself into diamagnetic material done
clear
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question_answer6)
If a diamagnetic substance is brought near north or south pole of a bar magnet, it is [EAMCET (Engg.) 1995; CBSE PMT 1999; AFMC 2003]
A)
Attracted by the poles done
clear
B)
Repelled by the pole done
clear
C)
Repelled by the north pole and attracted by the south pole done
clear
D)
Attracted by the north pole and repelled by the south pole done
clear
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question_answer7)
The material of permanent magnet has [KCET 1994, 2003; AFMC 2004]
A)
High retentivity, low coercivity done
clear
B)
Low retentivity, high coercivity done
clear
C)
Low retentivity, low coercivity done
clear
D)
High retentivity, high coercivity done
clear
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question_answer8)
The permanent magnet is made from which one of the following substances [Bihar MEE 1995]
A)
Diamagnetic done
clear
B)
Paramagnetic done
clear
C)
Ferromagnetic done
clear
D)
Electromagnetic done
clear
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question_answer9)
Temperature above which a ferromagnetic substance becomes paramagnetic is called [SCRA 1994; J & K CET 2004]
A)
Critical temperature done
clear
B)
Boyle's temperature done
clear
C)
Debye's temperature done
clear
D)
Curie temperature done
clear
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question_answer10)
When a magnetic substance is heated, then it [AIIMS 1999]
A)
Becomes a strong magnet done
clear
B)
Losses its magnetism done
clear
C)
Does not effect the magnetism done
clear
D)
Either (a) or (c) done
clear
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question_answer11)
The only property possessed by ferromagnetic substance is [KCET 1999]
A)
Hysteresis done
clear
B)
Susceptibility done
clear
C)
Directional property done
clear
D)
Attracting magnetic substances done
clear
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question_answer12)
Substances in which the magnetic moment of a single atom is not zero, is known as [AFMC 1999]
A)
Diamagnetism done
clear
B)
Ferromagnetism done
clear
C)
Paramagnetism done
clear
D)
Ferrimagnetism done
clear
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question_answer13)
Diamagnetic substances are [AFMC 1999]
A)
Feebly attracted by magnets done
clear
B)
Strongly attracted by magnets done
clear
C)
Feebly repelled by magnets done
clear
D)
Strongly repelled by magnets done
clear
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question_answer14)
The magnetic susceptibility is [RPMT 1999]
A)
\[\chi =\frac{I}{H}\] done
clear
B)
\[\chi =\frac{B}{H}\] done
clear
C)
\[\chi =\frac{M}{V}\] done
clear
D)
\[\chi =\frac{M}{H}\] done
clear
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question_answer15)
Which of the following statements are true about the magnetic susceptibility \[{{\chi }_{m}}\] of paramagnetic substance [Roorkee 1999]
A)
Value of \[{{\chi }_{m}}\] is inversely proportional to the absolute temperature of the sample done
clear
B)
cm is positive at all temperature done
clear
C)
\[{{\chi }_{m}}\] is negative at all temperature done
clear
D)
\[{{\chi }_{m}}\] does not depend on the temperature of the sample done
clear
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question_answer16)
Relative permeability of iron is 5500, then its magnetic susceptibility will be [KCET 2000; Kerala PMT 2004]
A)
5500 ´ 107 done
clear
B)
5500 ´ 10?7 done
clear
C)
5501 done
clear
D)
5499 done
clear
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question_answer17)
An example of a diamagnetic substance is [KCET 2000]
A)
Aluminium done
clear
B)
Copper done
clear
C)
Iron done
clear
D)
Nickel done
clear
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question_answer18)
The use of study of hysteresis curve for a given material is to estimate the [KCET (Engg./Med.) 2000]
A)
Voltage loss done
clear
B)
Hysteresis loss done
clear
C)
Current loss done
clear
D)
All of these done
clear
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question_answer19)
Magnetic permeability is maximum for [AIIMS 2000; MH CET 2003; DPMT 2003]
A)
Diamagnetic substance done
clear
B)
Paramagnetic substance done
clear
C)
Ferromagnetic substance done
clear
D)
All of these done
clear
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question_answer20)
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 [AMU 1999, 2000]
A)
Rise done
clear
B)
Fall done
clear
C)
Oscillate slowly done
clear
D)
Remain as such done
clear
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question_answer21)
The relative permeability is represented by mr and the susceptibility is denoted by c for a magnetic substance. Then for a paramagnetic substance [KCET (Engg./Med.) 2001]
A)
mr < 1, c < 0 done
clear
B)
mr < 1, c > 0 done
clear
C)
mr > 1, c < 0 done
clear
D)
mr > 1, c > 0 done
clear
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question_answer22)
Which of the following is true [BHU 2001]
A)
Diamagnetism is temperature dependent done
clear
B)
Paramagnetism is temperature dependent done
clear
C)
Paramagnetism is temperature independent done
clear
D)
None of these done
clear
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question_answer23)
The magnetic susceptibility does not depend upon the temperature in [CBSE PMT 2001]
A)
Ferrite substances done
clear
B)
Ferromagnetic substances done
clear
C)
Diamagnetic substances done
clear
D)
Paramagnetic substances done
clear
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question_answer24)
Identify the paramagnetic substance [KCET 2001]
A)
Iron done
clear
B)
Aluminium done
clear
C)
Nickel done
clear
D)
Hydrogen done
clear
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question_answer25)
If a magnetic substance is kept in a magnetic field, then which of the following is thrown out [DCE 1999, 2001]
A)
Paramagnetic done
clear
B)
Ferromagnetic done
clear
C)
Diamagnetic done
clear
D)
Antiferromagnetic done
clear
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question_answer26)
If the angular momentum of an electron is \[\overrightarrow{J\,}\] then the magnitude of the magnetic moment will be [MP PET 2002]
A)
\[\frac{eJ}{m}\] done
clear
B)
\[\frac{eJ}{2m}\] done
clear
C)
eJ 2m done
clear
D)
\[\frac{2m}{eJ}\] done
clear
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question_answer27)
The magnetic susceptibility is negative for [AIEEE 2002]
A)
Paramagnetic materials done
clear
B)
Diamagnetic materials done
clear
C)
Ferromagnetic materials done
clear
D)
Paramagnetic and ferromagnetic materials done
clear
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question_answer28)
The universal property of all substances is [CPMT 2002]
A)
Diamagnetism done
clear
B)
Ferromagnetism done
clear
C)
Paramagnetism done
clear
D)
All of these done
clear
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question_answer29)
Which of the following statements is incorrect about hysteresis [UPSEAT 2002]
A)
This effect is common to all ferromagnetic substances done
clear
B)
The hysteresis loop area is proportional to the thermal energy developed per unit volume of the material done
clear
C)
The hysteresis loop area is independent of the thermal energy developed per unit volume of the material done
clear
D)
The shape of the hysteresis loop is characteristic of the material done
clear
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question_answer30)
Curies law can be written as [MH CET 2002; CBSE PMT 2003]
A)
\[\chi \propto (T-{{T}_{c}})\] done
clear
B)
\[\chi \propto \frac{1}{T-{{T}_{c}}}\] done
clear
C)
\[\chi \propto \frac{1}{T}\] done
clear
D)
\[\chi \propto T\] done
clear
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question_answer31)
A superconductor exhibits perfect [KCET 2002]
A)
Ferrimagnetism done
clear
B)
Ferromagnetism done
clear
C)
Paramagnetism done
clear
D)
Diamagnetism done
clear
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question_answer32)
A small rod of bismuth is suspended freely between the poles of a strong electromagnet. It is found to arrange itself at right angles to the magnetic field. This observation establishes that bismuth is [Kerala 2002]
A)
Diamagnetic done
clear
B)
Paramagnetic done
clear
C)
Ferri-magnetic done
clear
D)
Antiferro-magnetic done
clear
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question_answer33)
A diamagnetic material in a magnetic field moves [Pb. PMT 1999; AIIMS 2000; MH CET 2000; CBSE PMT 2003]
A)
From weaker to the stronger parts of the field done
clear
B)
Perpendicular to the field done
clear
C)
From stronger to the weaker parts of the field done
clear
D)
In none of the above directions done
clear
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question_answer34)
Curie temperature is the temperature above which [DCE 2002; AIEEE 2003]
A)
A paramagnetic material becomes ferromagnetic done
clear
B)
A ferromagnetic material becomes paramagnetic done
clear
C)
A paramagnetic material becomes diamagnetic done
clear
D)
A ferromagnetic material becomes diamagnetic done
clear
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question_answer35)
A frog can be deviated in a magnetic field produced by a current in a vertical solenoid placed below the frog. This is possible because the body of the frog behaves as [AIIMS 2003]
A)
Paramagnetic done
clear
B)
Diamagnetic done
clear
C)
Ferromagnetic done
clear
D)
Antiferromagnetic done
clear
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question_answer36)
Which one of the following is a non-magnetic substance [MP PET 2004]
A)
Iron done
clear
B)
Nickel done
clear
C)
Cobalt done
clear
D)
Brass done
clear
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question_answer37)
Liquid oxygen remains suspended between two pole faces of a magnet because it is [AIIMS 2004]
A)
Diamagnetic done
clear
B)
Paramagnetic done
clear
C)
Ferromagnetic done
clear
D)
Antiferromagnetic done
clear
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question_answer38)
Curie-Weiss law is obeyed by iron at a temperature...... [KCET 2004]
A)
Below Curie temperature done
clear
B)
Above Curie temperature done
clear
C)
At Curie temperature only done
clear
D)
At all temperatures done
clear
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question_answer39)
The materials suitable for making electromagnets should have [AIEEE 2004]
A)
High retentivity and high coercivity done
clear
B)
Low retentivity and low coercivity done
clear
C)
High retentivity and low coercivity done
clear
D)
Low retentivity and high coercivity done
clear
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question_answer40)
The given figure represents a material which is [Orissa PMT 2004]
A)
Paramagnetic done
clear
B)
Diamagnetic done
clear
C)
Ferromagnetic done
clear
D)
None of these done
clear
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question_answer41)
For an isotropic medium B, m, H and M are related as (where \[B,\,\,{{\mu }_{0}},\,\,H\] and M have their usual meaning in the context of magnetic material [Pb. PMT 2004]
A)
\[(B-M)={{\mu }_{0}}H\] done
clear
B)
\[M={{\mu }_{0}}(H+M)\] done
clear
C)
\[H={{\mu }_{0}}(H+M)\] done
clear
D)
\[B={{\mu }_{o}}(H+M)\] done
clear
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question_answer42)
The magnetic susceptibility of any paramagnetic material changes with absolute temperature T as [UPSEAT 2004; DCE 2005]
A)
Directly proportional to T done
clear
B)
Remains constant done
clear
C)
Inversely proportional to T done
clear
D)
Exponentially decaying with T done
clear
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question_answer43)
When a piece of a ferromagnetic substance is put in a uniform magnetic field, the flux density inside it is four times the flux density away from the piece. The magnetic permeability of the material is [UPSEAT 2004]
A)
1 done
clear
B)
2 done
clear
C)
3 done
clear
D)
4 done
clear
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question_answer44)
Which of the following is diamagnetism [DCE 2002]
A)
Aluminium done
clear
B)
Quartz done
clear
C)
Nickel done
clear
D)
Bismuth done
clear
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question_answer45)
If a ferromagnetic material is inserted in a current carrying solenoid, the magnetic field of solenoid [DCE 2004]
A)
Largely increases done
clear
B)
Slightly increases done
clear
C)
Largely decreases done
clear
D)
Slightly decreases done
clear
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question_answer46)
In the hysteresis cycle, the value of H needed to make the intensity of magnetisation zero is called [DCE 2004]
A)
Retentivity done
clear
B)
Coercive force done
clear
C)
Lorentz force done
clear
D)
None of the above done
clear
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question_answer47)
If the magnetic dipole moment of an atom of diamagnetic material, paramagnetic material and ferromagnetic material denoted by \[{{\mu }_{d}},\,{{\mu }_{p}},\,{{\mu }_{f}}\]respectively then [CBSE PMT 2005]
A)
\[{{\mu }_{d}}\ne \text{ 0 and }{{\mu }_{f}}\ne \text{ 0}\] done
clear
B)
\[{{\mu }_{p}}=\text{ 0 and }{{\mu }_{f}}\ne \text{ 0}\] done
clear
C)
\[{{\mu }_{d}}=\text{ 0 and }{{\mu }_{p}}\ne \text{ 0}\] done
clear
D)
\[{{\mu }_{d}}\ne \text{ 0 and }{{\mu }_{p}}=\text{ 0}\] done
clear
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question_answer48)
Among the following properties describing diamagnetism identify the property that is wrongly stated [KCET 2005]
A)
Diamagnetic material do not have permanent magnetic moment done
clear
B)
Diamagnetism is explained in terms of electromagnetic induction done
clear
C)
Diamagnetic materials have a small positive susceptibility done
clear
D)
The magnetic moment of individual electrons neutralize each other done
clear
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question_answer49)
Susceptibility of ferromagnetic substance is [Orissa JEE 2005]
A)
> 1 done
clear
B)
< 1 done
clear
C)
0 done
clear
D)
1 done
clear
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question_answer50)
When a ferromagnetic material is heated to temperature above its Curie temperature, the material [UPSEAT 2005]
A)
Is permanently magnetized done
clear
B)
Remains ferromagnetic done
clear
C)
Behaves like a diamagnetic material done
clear
D)
Behaves like a paramagnetic material done
clear
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