Download App

Magnetism And Matter — Physics STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 SciencePhysicsMagnetism And Matter1 Mark
MCQ
Domain formation is the necessary feature of:
  • A
    Ferro magnetism.
  • B
    Paramagnetism.
  • C
    Diamagnetism.
  • D
    Electro magnetism.
✓

Answer


a. Ferro magnetism.
Explanation: This problem is based on Magnetism. Ferro-magnetism is the property of certain substances due to which they get strongly attracted to a magnet and strongly influenced in a magnetic field. Certain substances like iron, nickel, cobalt, etc, are ferro-magnetic in nature. Every atom of such materials, behave like small bar-magnets. The proper word is magnetic dipoles. In ferromagnetic materials, there are small regions known as domains. In each domain, all the atoms are alligned in one direction. All of them have their north-pole facing one side and their south-pole facing the other side. Hence every domain behaves like a dipole. In the above picture, the arrows indicate the domains, pointing towards their north-poles. In the absence of any magnetic field, all the domains are alligned randomly and so, the substance doesn't have any magnetic properties. When the substance is placed in a weak magnetic field, a few domains turn and allign in the direction of the field, some domains which are already in the direction of the field expand slightly, and those alligned in direction opposite to the field, reduce in size. As a result, the entire substance has a mild dipole-like properties. When the substance is placed in a strong magnetic field, many domains rapidly turn and allign in the direction of the field, the domains which are already in the direction of the field expand tremendously, and those alligned in direction opposite to the field, shrink so much that they almost disappear. As a result, all the domains are parallel to each other and alligned in one direction. The entire substance now becomes a strong bar-magnet.
Image

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "M.C.Q (1 Marks)" from Magnetism And Matter→Magnetism And Matter — all question types→Physics STD 12 Science question papers→Gujarat Board STD 12 Science question papers→Gujarat Board question paper generator→

Similar questions

If luminous efficiency of a lamp is 2 lumen/watt and its luminous intensity is 42 candela, then power of the lamp is

(a) 62 W 

(b) 76 W

(c) 138 W

(d) 264 W
→

If current flowing through shell of previous objective is equal to i, then energy density at a point distance 2R from axis of the shell varies according to the graph

(a)

(b)

(c)

(d)
→

A circular coil of radius 4 cm and of 20 turns carries a current of 3 amperes. It is placed in a magnetic field of intensity of 0.5 . The magnetic dipole moment of the coil is

(a) 0.15  

(b) 0.3

(c) 0.45

(d) 0.6

→
Resistors are generally colour coded to:
→

The plates of a parallel plate condenser are pulled apart with a velocity v. If at any instant their mutual distance of separation is d, then the magnitude of the time of rate of change of capacity depends on d as follows

(a)  

(b)

(c)  

(d) d
→
A vertical wire carries a current in upward direction. An electron beam sent horizontally towards the wire will be deflected:
→
A bullet hits a block kept at rest on a smooth horizontal surface and gets embedded into it. Which of the following does not change?
  1. Linear momentum of the block.
  2. Kinetic energy of the block.
  3. Gravitational potential energy of the block.
  4. Temperature of the block.
→
Planck constant has the same dimensions as:
→

Decay constant of radium is λ. By a suitable process its compound radium bromide is obtained. The decay constant of radium bromide will be

(a) λ

(b) More than  λ

(c) Less than λ

(d) Zero
→
In Boolean algebra, A + B = Y implies that:
→