Magnetism and Matter · Physics · MHT CET

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MCQ (Single Correct Answer)

1

A solenoid having 400 turns per metre has a core of a material with relative permeability 400. When a current of 0.5 A is passed through it, the magnetization of the core material in $\mathrm{Am}^{-1}$ is nearly

MHT CET 2024 16th May Evening Shift
2

The materials having negative magnetic susceptibility are

MHT CET 2024 16th May Morning Shift
3

A bar magnet has length 4 cm , cross-sectional area $2 \mathrm{~cm}^2$ and magnetic moment $6 \mathrm{Am}^2$. The intensity of magnetisation of bar magnet is

MHT CET 2024 11th May Morning Shift
4

In the following graph of flux density versus magnetizing force, coercivity and retentivity are respectively represented by the points

MHT CET 2024 10th May Morning Shift Physics - Magnetism and Matter Question 4 English

MHT CET 2024 10th May Morning Shift
5
 

The correct relation between total magnetic field $(B)$, magnetic intensity $(\mathrm{H})$, permeability of free space $\left(\mu_0\right)$ and susceptibility $(\chi)$ is

MHT CET 2024 9th May Evening Shift
6

A magnetic intensity of $500 \mathrm{~A} / \mathrm{m}$, produces a magnetic flux of $2.4 \times 10^{-5} \mathrm{~Wb}$ in an iron bar of cross-sectional area $0.4 \mathrm{~cm}^2$. The magnetic permeability of the iron bar is

MHT CET 2024 4th May Evening Shift
7

The magnetic moments associated with two closely wound circular coils A and B of radius $r_A=10 \mathrm{~cm}$ and $r_B=20 \mathrm{~cm}$ respectively are equal if $\left(N_A, I_A\right.$ and $N_B, I_B$ are number of turns and current of A and B respectively)

MHT CET 2024 4th May Morning Shift
8

The magnetic susceptibility of the material of a rod is 599. The absolute permeability of the material of the rod will be [ $\mu_0=4 \pi \times 10^{-7}$ SI unit]

MHT CET 2024 3rd May Evening Shift
9

A magnetic needle of magnetic moment $6 \times 10^{-2} \mathrm{Am}^2$ and moment of inertia $9.6 \times 10^{-5} \mathrm{~kg} \mathrm{~m}^2$ performs simple harmonic motion in a magnetic field of 0.01 T . Time taken to complete 10 oscillations is [Take $\pi=3 \cdot 14$]

MHT CET 2024 3rd May Morning Shift
10

The relation between total magnetic field (B), magnetic intensity $(\mathrm{H})$, permeability of free space $\left(\mu_0\right)$ and susceptibility $(\chi)$ is

MHT CET 2024 3rd May Morning Shift
11

A ferromagnetic material is heated above its curie temperature. The correct statement from the following is that

MHT CET 2024 2nd May Evening Shift
12

At certain place a magnet makes 30 oscillations per minute. At another place if the magnetic induction is increased by two times the magnetic induction at first place, then the time period of same magnet will be

MHT CET 2024 2nd May Morning Shift
13

In the hysteresis curve the value of magnetization (B) which will be present in a substance when value of magnetizing force $$(\mathrm{H})$$ is made zero $$(\mathrm{H}=0)$$ is called as

MHT CET 2023 14th May Evening Shift
14

Magnetic shielding is done by surrounding the instrument to be protected from magnetic field by

MHT CET 2023 13th May Evening Shift
15

For which of the following substances, the magnetic susceptibility is independent of temperature?

MHT CET 2023 13th May Morning Shift
16

A solenoid of 500 turns/m is carrying a current of 3 A. Its core is made of iron which has relative permeability 5001. The magnitude of magnetization is

MHT CET 2023 10th May Evening Shift
17

According to Curie's law in magnetism, the correct relation is ( $$\mathrm{M}=$$ magnetization in paramagnetic sample, $$\mathrm{B}=$$ applied magnetic field, $$\mathrm{T}=$$ absolute temperature of the material, $$\mathrm{C}=$$ curie's constant)

MHT CET 2023 10th May Morning Shift
18

A thin rod of length $$L$$ has magnetic moment $$M$$ when magnetised. If rod is bent in a semicircular arc what is magnetic moment in new shape?

MHT CET 2023 9th May Evening Shift
19

The materials suitable for making electromagnets should have

MHT CET 2023 9th May Morning Shift
20

The magnetic susceptibility of the material of a rod is 349 and permeability of vacuum $$\mu_0$$ is $$4 \pi \times 10^{-7}$$ SI units. Absolute permeability of the material of the rod in SI units is

MHT CET 2022 11th August Evening Shift
21

Two bar magnets '$$\mathrm{P}$$' and '$$\mathrm{Q}$$' are kept in uniform magnetic field '$$\mathrm{B}$$' with magnetic moments '$$\mathrm{M_P}$$' and '$$\mathrm{M_Q}$$' respectively. Magnet 'P' is oscillating with frequency twice that of magnet 'Q'. If the moment of inertia of the magnet 'P' is twice that of magnet 'Q' then

MHT CET 2021 24th September Evening Shift
22

A magnetic dipole of magnetic moment $$\mathrm{M}$$, is freely suspended in a magnetic field of induction B. The minimum and maximum values of potential energy of the dipole, respectively are

MHT CET 2021 24th September Evening Shift
23

A current '$$I$$' is flowing in a conductor of length '$$L$$' when it is bent in the form of a circular loop, its magnetic moment will be

MHT CET 2021 24th September Morning Shift
24

A bar magnet has length $$3 \mathrm{~cm}$$, cross-sectional area $$2 \mathrm{~cm}^2$$ and magnetic moment $$3 \mathrm{~Am}^2$$. The intensity of magnetisation of bar magnet is

MHT CET 2021 23th September Morning Shift
25

The relative permeability of iron is 2000. Its absolute permeability in SI unit will be $$\left(\frac{\mu_0}{4 \pi}=10^{-7} \text{SI unit}\right)$$

MHT CET 2021 22th September Evening Shift
26

The permeability of a metal is $$0.1256 ~\mathrm{TmA}^{-1}$$. Its relative permeability will be $$\mathrm{\left( {{{{\mu _0}} \over {4\pi }} = {{10}^{ - 7}}\,SI\,unit} \right)}$$ ($$\pi=3.14$$)

MHT CET 2021 22th September Morning Shift
27

The north pole of a long horizontal bar magnet is being brought towards closed circuit consisting of a coil. The direction of induced current produced in it is

MHT CET 2021 21th September Evening Shift
28

What is susceptibility of a medium, if its relative permeability is 0.85?

MHT CET 2021 21th September Morning Shift
29

A steel wire of length / has a magnetic moment $M$. It is then bent into a semicircular arc. The new magnetic moment is

MHT CET 2020 19th October Evening Shift
30

A domain in a ferromagnetic substance is in the form of a cube of side $1 \mu \mathrm{~m}$. If it contains $8 \times 10^{10}$ atoms and each atomic dipole has a dipole moment of $9 \times 10^{-24} \mathrm{Am}^2$, then the magnetisation of the domain is

MHT CET 2020 19th October Evening Shift
31

For a paramagnetic substance, the magnetic susceptibility is

MHT CET 2020 19th October Evening Shift
32

The magnetic susceptibility of a paramagnetic material at $$-73^{\circ} \mathrm{C}$$ is 0.0075. Its value at $$-173^{\circ} \mathrm{C}$$ will be

MHT CET 2020 16th October Evening Shift
33

If the angle of dip at places $$A$$ and $$B$$ are $$30^{\circ}$$ and $$45^{\circ}$$ respectively, then the ratio of horizontal component of earth's magnetic field at $$A$$ to that at $$B$$ will be $$\left[\sin 45^{\circ}=\cos 45^{\circ}=\frac{1}{\sqrt{2}}, \sin \frac{\pi}{6}=\frac{1}{2}, \cos \frac{\pi}{6}=\frac{\sqrt{3}}{2}\right]$$

MHT CET 2020 16th October Evening Shift
34

A thin light weight rod of diamagnetic substance such as silver is suspended in uniform external magnetic field. It will align itself with its length

MHT CET 2020 16th October Evening Shift
35

Two identical bar magnets each of magnetic moment $$M$$, separated by some distance are kept perpendicular to each other. The magnetic induction at a point at the same distance $$d$$ from the centre of magnets, is ($$\mu_0=$$ permeability of free space)

MHT CET 2020 16th October Morning Shift
36

An iron rod is placed parallel to magnetic field of intensity $$2000 \mathrm{~A} / \mathrm{m}$$. The magnetic flux through the rod is $$6 \times 10^{-4} \mathrm{~Wb}$$ and its cross-sectional area is $$3 \mathrm{~cm}^2$$. The magnetic permeability of the rod in $$\frac{\mathrm{Wb}}{\mathrm{A}-\mathrm{m}}$$ is

MHT CET 2020 16th October Morning Shift
37

A magnetizing field of $5000 \mathrm{~A} / \mathrm{m}$ produces a magnetic flux of $4 \times 10^{-5} \mathrm{~Wb}$ in an iron rod of cross-sectional area $0.4 \mathrm{~cm}^2$. The permeabilit of the rod in Wb/A-m, is

MHT CET 2019 3rd May Morning Shift
38

The magnetization of bar magnet of length 5 cm , cross sectional area $2 \mathrm{~cm}^2$ and net magnetic moment $1 \mathrm{Am}^2$ is

MHT CET 2019 2nd May Evening Shift
39

Magnetic susceptibility of a paramagnetic substance is

MHT CET 2019 2nd May Evening Shift
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