Recommended PYQs (STRICTLY NCERT Based) Magnetism and Matter Physics NEET Practice Questions, MCQs, Past Year Questions (PYQs), NCERT Questions, Question Bank, Class 11 and Class 12 Questions, and PDF solved with answers

In a uniform magnetic field of

0.049 T

$0.049~\text T$ , a magnetic needle performs

20

$20$ complete oscillations in

5

$5$ seconds as shown. The moment of inertia of the needle is

9.8 \times 10^{- 6} {kg m}^{2}

$9.8 × 10^{-6} ~\text{kg m}^2$ . If the magnitude of magnetic moment of the needle is

x \times 10^{- 5} {Am}^{2};

$x \times 10^{-5 }~\text {Am}^2;$ then the value of '

x

$x$ ' is:

1.	$128\pi^2$	2.	$50\pi^2$
3.	$1280\pi^2$	4.	$5\pi^2$

Subtopic: Bar Magnet |

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Q2:

Match List-I with List-II.

List-I Material		List-II Susceptibility $(\chi)$
$\mathrm{(A)}$	Diamagnetic	$\mathrm{(I)}$	$\chi=0$
$\mathrm{(B)}$	Ferromagnetic	$\mathrm{(II)}$	$0>\chi\geq-1$
$\mathrm{(C)}$	Paramagnetic	$\mathrm{(III)}$	$\chi\gg1$
$\mathrm{(D)}$	Non-magnetic	$\mathrm{(IV)}$	$0<\chi<\varepsilon$ (a small positive number)

Choose the correct answer from the options given below:

1.	$\text{A-II, B-I, C-III, D-IV}$	2.	$\text{A-III, B-II, C-I, D-IV}$
3.	$\text{A-IV, B-III, C-II, D-I}$	4.	$\text{A-II, B-III, C-IV, D-I}$

Subtopic: Magnetic Materials |

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Q3:

An iron bar of length

L

$L$ has a magnetic moment

M .

$M.$ It is bent at the middle of its length such that the two arms make an angle

60^{\circ}

$60^\circ$ with each other. The magnetic moment of this new magnet is:

1.	$\dfrac{M}{2}$	2.	${2 M}$
3.	$\dfrac{{M}}{\sqrt{3}}$	4.	$M$

Subtopic: Bar Magnet |

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Q4:

The length of a magnetized iron bar is

L

$L$ and its magnetic moment is

M .

$M.$ When this bar is bent to form a semicircle its magnetic moment is:

1.	$M$	2.	$\dfrac{M\pi}{2}$
3.	$\dfrac{M}{2\pi}$	4.	$\dfrac{2M}{\pi}$

Subtopic: Bar Magnet |

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Q5:

Match List-I with List-II

	List-I (Material)		List-II (Example)
(A)	Diamagnet	(I)	Alnico
(B)	Paramagnet	(II)	Copper
(C)	Soft ferromagnet	(III)	Aluminium
(D)	Hard ferromagnet	(IV)	Gadolinium

Choose the correct answer from the options given below:

1.	A-I, B-II, C-III, D-IV
2.	A-IV, B-III, C-II, D-I
3.	A-III, B-II, C-I, D-IV
4.	A-II, B-III, C-IV, D-I

Subtopic: Magnetic Materials |

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Q6:

The best suited curve showing the variations of susceptibility (

χ

$\chi$ ) of a paramagnetic material in free space with temperature (

T

$T$ ) is:

1.		2.
3.		4.

Subtopic: Magnetic Materials |

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Q7:

The magnetic potential energy when a magnetic bar with a magnetic moment

\vec{M}

$\vec{M}$ is placed perpendicular to the magnetic field

\vec{B}

$\vec{B}$ is:

1.	$\dfrac{-mB}{2}$	2.	zero
3.	$-mB$	4.	$mB$

Subtopic: Analogy between Electrostatics & Magnetostatics |

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Q8:

The incorrect relation for a diamagnetic material (all the symbols carry their usual meaning and

ε

$\varepsilon$ is a small positive number) is:
1.

μ < μ_{0}

$\mu<\mu_{0}$
2.

0 ⩽ μ_{r} < 1

$0\leqslant\mu_{\mathrm{r}}<1$
3.

- 1 ⩽ χ < 0

$-1\leqslant\chi<0$
4.

1 < μ_{r} < 1 + ε

$1<\mu_r<1+\varepsilon$

Subtopic: Magnetic Materials |

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Q9:

The magnetic moment and moment of inertia of a magnetic needle as shown are, respectively,

1.0 \times 10^{- 2} {A m}^{2} and \frac{10^{- 6}}{π^{2}} {kg m}^{2} .

$1.0\times10^{-2}~\text{A m}^{2}~\text{and}~\frac{10^{-6}}{\pi^{2}}~\text{kg m}^{2}.$ If it completes

10

$10$ oscillations in

10 s,

$10~\text s,$ the magnitude of the magnetic field is:

1.

0.4 T

$0.4~\text T$
2.

4 T

$4~\text T$
3.

0.4 mT

$0.4~\text{mT}$
4.

4 mT

$4~\text{mT}$

Subtopic: Magnetization & Magnetic Intensity |

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Q10:

The magnetic moment of an iron bar is

M .

$M.$ It is now bent in such a way that it forms an arc section of a circle subtending an angle of

60^{\circ}

$60^\circ$ at the centre. The magnetic moment of this arc section is:

1.	$\dfrac{3 M}{\pi}$	2.	$\dfrac{4M}{\pi}$
3.	$\dfrac{ M}{\pi}$	4.	$\dfrac{2 M}{\pi}$

Subtopic: Bar Magnet |

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