Solved papers for NEET Physics Magnetism NEET PYQ-Magnetism

done NEET PYQ-Magnetism Total Questions - 26

• question_answer1) For protecting a sensitive equipment from the external magnetic field, it should be:                  [AIPMT 1998]

A)
placed inside an aluminium can

B)
placed inside an iron can

C)
wrapped with insulation around it when passing current through it

D)
surrounded with fine copper sheet

• question_answer2) A diamagnetic substance is brought near a strong magnet, then it is:                                         [AIPMT 1999]

A)
attracted by a magnet

B)
repelled by a magnet

C)
repelled by north pole and attracted by south pole

D)
attracted by north pole and repelled by south pole

• question_answer3) A bar magnet of magnetic moment $\vec{M}$ is placed in a magnetic field of induction $\vec{B}$. The torque exerted on it is:                                                                                                                                      [AIPMT 1999]

A)
$\vec{M}\,\vec{B}$

B)
$-\vec{M}\,\vec{B}$

C)
$\vec{M}\times \,\vec{B}$

D)
$-\vec{M}\times \,\vec{B}$

• question_answer4) Tangent galvanometer measures:                                                                          [AIPMT 2001]

A)
capacitance

B)
current

C)
resistance

D)
potential difference

• question_answer5) In which type of material the magnetic susceptibility does not depend on temperature?             [AIPMT 2001]

A)
Diamagnetic

B)
Paramagnetic

C)
Ferromagnetic

D)
Ferrite

• question_answer6) Two bar magnets having same geometry with magnetic moments M and 2M, are firstly placed in such a way that their similar poles are on the same side; then its period of oscillation is ${{T}_{1}}$. Now the polarity of one of the magnets is reversed, then time period of oscillations will be:                                                                                           [AIPMT 2002]

A)
${{T}_{1}}<{{T}_{2}}$

B)
${{T}_{1}}>{{T}_{2}}$

C)
${{T}_{1}}={{T}_{2}}$

D)
${{T}_{2}}=\,\infty$

• question_answer7) A bar magnet is oscillating in the earth's magnetic field with a period T. What happens to its period and motion if its mass is quadrupled?                                                                                                                   [AIPMT 2003]

A)
Motion remains SH with time period $=4T$

B)
Motion remains SH and period remains nearly constant

C)
Motion remains SH with time period $=T/2$

D)
Motion remains SH with time period $=2T$

• question_answer8) A diamagnetic material in a magnetic field moves:                                                                     [AIPMT 2003]

A)
perpendicular to the field

B)
from weaker to the stronger parts of the field

C)
from stronger to the weaker parts of the field

D)
in none of the above directions

• question_answer9) According to Curie's law, the magnetic susceptibility of a paramagnetic substance at an absolute temperature T is proportional to:                                                                                                                                [AIPMT 2003]

A)
$\frac{1}{{{T}^{2}}}$

B)
${{T}^{2}}$

C)
$\frac{1}{T}$

D)
T

• question_answer10) If the magnetic dipole moment of an atom of diamagnetic material, paramagnetic material and ferromagnetic material are denoted by ${{\mu }_{d}},{{\mu }_{p}}$ and ${{\mu }_{f}}$ respectively, then:   [AIPMT (S) 2005]

A)
${{\mu }_{d}}\ne 0$ and ${{\mu }_{f}}\ne 0$

B)
${{\mu }_{p}}=0$ and ${{\mu }_{f}}\ne 0$

C)
${{\mu }_{d}}=0$ and ${{\mu }_{p}}\ne 0$

D)
${{\mu }_{d}}\ne 0$ and ${{\mu }_{p}}=0$

• question_answer11) Above Curie temperature:                                                                                     [AIPMT (S) 2006]

A)
a ferromagnetic substance becomes paramagnetic

B)
a paramagnetic substance becomes  diamagnetic

C)
a diamagnetic substance becomes paramagnetic

D)
a paramagnetic substance becomes ferromagnetic

• question_answer12) Nickel shows ferromagnetic property at room temperature. If the temperature is increased beyond Curie temperature, then it will show:                                                                                        [AIPMT (S) 2007]

A)
paramagnetism

B)
anti-ferromagnetism

C)
no magnetic property

D)
diamagnetism

• question_answer13) Curie temperatures is the temperature above which                          [AIPMPT (S) 2008]

A)
ferromagnetic    material    becomes paramagnetic material

B)
paramagnetic    material    becomes         diamagnetic material

C)
paramagnetic    material    becomes        ferromagnetic material

D)
ferromagnetic    material    becomes         diamagnetic material

• question_answer14) The magnetic moment of a diamagnetic atom is                             [AIPMT (M) 2010]

A)
much greater than one

B)
one

C)
between zero and one

D)
equal to zero

• question_answer15)  Two identical bar magnets are fixed with their centres at a distance d apart. A stationary charge Q is placed at P in between the gap of the two magnets at a distance D from the centre O as shown in the figure The force on the charge Q is                                                                                        [AIPMT (M) 2010]

A)
zero

B)
directed along OP

C)
directed along PO

D)
directed perpendicular to the plane of paper

• question_answer16) A short bar magnet of magnetic moment $0.4J\,{{T}^{-1}}$ is place in a uniform magnetic field of 0.16 T. The magnet is stable equilibrium when the potential energy is                                                        [AIPMT (M) 2011]

A)
$-\,0.64\,J$

B)
zero

C)
$-\text{ }0.082\,J$

D)
$0.064\text{ }J$

• question_answer17)  There are four light-weight-rod samples A, B, C, D separately suspended by threads. A bar magnet is slowly brought near each sample and the following observations are noted                                                        [AIPMT (S) 2011] (i) A is feebly repelled (ii) B is feebly attracted (iii) C is strongly attracted (iv) D remains unaffected Which one of the following is true?

A)
C is of a diamagnetic material

B)
D is of a ferromagnetic material

C)
A is of a non-magnetic material

D)
B is of a paramagnetic material

• question_answer18) A magnetic needle suspended parallel to a magnetic field requires $\sqrt{3}\,J$ of work to turn it through ${{60}^{o}}$. The torque needed to maintain the needle in this position will be                                      [AIPMT (M) 2012]

A)
$2\sqrt{3}\,J$

B)
$3\,J$

C)
$\sqrt{3}\,J$

D)
$\frac{3}{2}\,\,J$

• question_answer19) A compass needle which is allowed to move in a horizontal plane is taken to a geomagnetic pole. It   [AIPMT (S) 2012]

A)
will become rigid showing no movement

B)
will stay in any position

C)
will stay in north-south direction only

D)
will stay in east-west direction only

• question_answer20)  A bar magnet of length $I$ and magnetic dipole moment M is bent in the form of an arc as shown in figure. The new magnetic dipole moment will be                                                                                             [NEET 2013]

A)
M

B)
$\frac{3}{\pi }M$

C)
$\frac{2}{\pi }M$

D)
$\frac{M}{2}$

• question_answer21)  Following figures show the arrangement of bar magnets in different configurations. Each magnet has magnetic dipole moment m. Which configuration has highest net magnetic dipole moment?                                    [NEET 2014] (i)       (ii)          (ii)         (iv)

A)
(i)

B)
(ii)

C)
(iii)

D)
(iv)

• question_answer22) The magnetic susceptibility is negative for :                                                             [NEET - 2016]

A)
diamagnetic material only

B)
paramagnetic material only

C)
ferromagnetic material only

D)
paramagnetic and ferromagnetic materials

• question_answer23) If ${{\theta }_{1}}$ and ${{\theta }_{2}}$ be the apparent angles of dip observed in two vertical planes at right angles to each other, then the true angle of dip $\theta$ is given by                                                   [NEET-2017]

A)
${{\tan }^{2}}\theta ={{\tan }^{2}}{{\theta }_{1}}-{{\tan }^{2}}{{\theta }_{2}}$

B)
${{\cot }^{2}}\theta ={{\cot }^{2}}{{\theta }_{1}}+{{\cot }^{2}}{{\theta }_{2}}$

C)
${{\tan }^{2}}\theta ={{\tan }^{2}}{{\theta }_{1}}+{{\tan }^{2}}{{\theta }_{2}}$

D)
${{\cot }^{2}}\theta ={{\cot }^{2}}{{\theta }_{1}}-{{\cot }^{2}}{{\theta }_{2}}$

• question_answer24)   A thin diamagnetic rod is placed vertically between the poles of an electromagnet. When the current in the electromagnet is switched on, then the diamagnetic rod is pushed up, out of the horizontal magnetic field. Hence the rod gains gravitational potential energy. The work required to do this comes from                                         [NEET - 2018]

A)
The lattice structure of the material of the rod

B)
The magnetic field

C)
The current source

D)
The induced electric field due to the changing magnetic field

• question_answer25) At a point A on the earths surface the angle of dip,$\delta =+25{}^\text{o}$. At a point B on the earths surface the angle of dip,$\delta =25{}^\text{o}$. We can interpret that:                                                                  [NEET 2019]

A)
A is located in the northern hemisphere and B is located in the southern hemisphere

B)
A and B are both located in the southern hemisphere

C)
A and B are both located in the northern hemisphere

D)
A is located in the southern hemisphere and B is located in the northern hemisphere

• question_answer26)  An iron rod of susceptibility 599 is subjected to a magnetizing field of $1200\text{ }A\text{ }{{m}^{1}}$. The permeability of the material of the rod is: $({{\mu }_{0}}=4\pi \times {{10}^{-7}}T\,m\,{{A}^{-1}})$                                                                                                                                    [NEET 2020]

A)
$8.0\times {{10}^{5}}\text{ }T\text{ }m\text{ }{{A}^{1}}$

B)
$2.4\pi \times \text{ }{{10}^{5}}\text{ }T\text{ }m\text{ }{{A}^{1}}$

C)
$2.4\pi \times {{10}^{7}}\text{ }T\text{ }m\text{ }{{A}^{1}}$

D)
$2.4\pi \times {{10}^{4}}\text{ }T\text{ }m\text{ }{{A}^{1}}$