The most suitable metal for making permanent magnet is

A device used to detect very weak magnetic field produced by brain is name as

Curie temperature of iron is

The substances in which magnetic fields produced by orbital and spin motion of electrons add up to zero, are called

A pure semi-conductor behaves like an insulator at

Which one of the following can become a good permanent magnet?

Above curie temperature iron behaves as

A body which does not undergo any deformation when subjected to set of balanced force is called

The core of transformer is laminated or reduces

When a magnet is heated it

In n-type substances, the minority carriers are

The critical temperature of mercury is

A permanent magnetic is made from a materials which is

The retentivity of the steel is

Which of the following substance has highest elasticity?

Each domain behaves like a

Which one of the following is a polymeric solid

The idea that all magnetic effects may be (Inc to circulating currents was first held by

A superconductor with critical temperature above 77K (boiling point of liquid nitrogen) is referred as

The fractional change in volume per unit increase in pressure is called

Which one of the following can become a good temporarily magnet?

The modulus of rigidity of a liquid is

A steel wire is loaded by a 2 kg mass. If the radius of wire is doubled, its extension will become

Which of the following does not undergo plastic deformation?

A wire can support a load w without breaking. It is cut into two equals' parts. The maximum load at each part can support is

The area under hysteresis loop is proportional to

Which one of the following is crystalline solid

Within each domain, the magnetic field of all the spinning electrons are

The critical temperature for mercury is

The temperature at which the material loses its orderliness due to increase in thermal vibration is called

Substances which undergo plastic deformation until they break are known as

If a magnetic material is beaten with a hammer then it magnetism

Conductors have conductivities of the order of

Good conductors have conductivities of the order of

A trivalent impurity is usually called

A hole in a p-type semiconductor is

The material of a permanent magnet has

Substances which break just after the elastic limit is reached are called

The critical temperature for aluminum is

When the conductivity of a semiconductor is only due to the breaking of the covalent bonds, the semiconductor is called

A pentavalent impurity is usually called

A cable is shortened to half its length. The maximum load it can support without exceeding its elastic limit is

The first superconductor was discovered by

The critical temperature of aluminum is

The process in which magnetization reduces to zero by reversing the magnetizing current is called

Curie is the unit of

The critical temperature of tin is

The young's modulus of water is

The breaking stress of a material is defined as

The young's modulus of steel is

The first superconductor was discovered in

Minority carries in p-type substances are

If the tensile force is suddenly removed from a wire then its temperature will

The Curie temperature of iron is

Yttrium barium copper oxide (YBa₂Cu₃O₇) can become superconductor at

Large area of hysteresis loop shows

In p-type substances, the minority carriers are

The instrument which helps in studying the process of hysteresis is

In a semiconductor material, the total current is due to flow of

Aluminum, tin and lead are superconductors

Magnetism lags behind the magnetizing current this phenomenon is called

On doping, the conductivity of semiconductor

The SI unit of stress is same as that of

Which of the following is the bonding in a germanium crystal?

Domains are exited in

Curie temperature of iron is

Each domain of the order of millimeters of a certain substances might certain

When the current reduced to zero and the material remain magnetized this property is called

Which type of impurity is to be added to a pure semi-conductor crystal to provide holes

Which one pair belong to acceptor impurity

The practical use of superconductors is

The substances in which the atoms cooperate with each other in such a way to exhibit a strong magnetic effects is called

With rise in temperature, the specific resistance of a semiconductor

The critical temperature of lead is

Demagnetization of a magnet can be done by

The field produced by an electron is generated by its

In p-type substances, the majority carriers are

Energy per unit volume of a stretched wire is

The critical temperature of aluminum is

The conductivity of semi-conductor is of the order of

The substance which shows practically no elastic after effect is

The critical temperature (Te) of lead is

The materials whose resistivity becomes zero below a certain temperature are called

Iron, cobalt and nickel are examples of

A material with high retentivity and large coercivity is most useful to make

Water copper bismuth and antimony are examples of

A freely suspended bar magnet oscillates with a period T. If it is cut into two equal parts parallel to its length, the time period of each part will be

A small microscopic region of a substance containing about 10

To get N-type the Ge is dopped with

The modulus of elasticity of a material does not depend upon

Which one of the following is not semiconductor?

Hysteresis curve is studied in terms of

Which one is pentavalent impurity?

At 0 k semi-conductors are

The curie temperature for iron is about

A p-type crystal is

All the magnetic materials lose their magnetic properties when

Which is the most suitable material for making permanent magnetic?

The temperature below which the resistivity of a superconductor falls to zero is called

The energy required to magnetize or demagnetize the material is called

In N-type substances, the minority charge carriers are