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CBSE

Subject

Physics

NEET Physics : Magnetism and Matter

Multiple Choice Questions

51.

When a ferromagnetic material is heated above its Curie temperature it

gets demagnetised
becomes diamagnetic
behaves like a paramagnetic substance
remains unaffected

52.

Relative permeability of iron is 5500, then its magnetic susceptibility will be

5500 × 10⁷
5500 × 10^-7
5501
5499

53.

A hydrogen atom is paramagnetic. A hydrogen molecule is

diamagnetic
paramagnetic
ferromagnetic
none of these

54.

At a certain place, magnitude of horizontal and vertical components of a magnetic field are same. The total intensity of magnetic field at that place will be

H
H²
2H
$\sqrt{2} H$

55.

Which one of the following is ferromagnetic?

Gold
Wood
Manganese
Nickle

56.

The magnetic lines of force inside a bar magnet

are from north-pole to south-pole of the magnet
do not exist
depend upon the area of cross-section of the bar magnet
are from south-pole to north-pole of the magnet

57.

A bar magnet of magnetic moment $\vec{M}$ is placed in the magnetic field $\vec{B}$ . The Torque acting on the magnet is :

$\vec{M} \times \vec{B}$
$\vec{M} - \vec{B}$
$\frac{1}{2} \vec{M} \times \vec{B}$
$\vec{M} + \vec{B}$

58.

Curie temperature is the temperature above which

a ferromagnetic material becomes paramagnetic
a paramagnetic material becomes diamagnetic
a ferromagnetic material becomes diamagnetic
a paramagnetic material becomes ferromagnetic

59.

In the unmagnetized state magnetic domains of a magnetic substance are oriented at

60°
90°
randomly
150°

60.

Iron is ferromagnetic

at all temperatures
at NTP only
above 770°C
below 770°C

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