The curie temperature for iron is about

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

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

When a magnet is heated it

Which of the following substance has highest elasticity?

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

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

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

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

The area under hysteresis loop is proportional to

Which is the most suitable material for making permanent magnetic?

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

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

Which one is pentavalent impurity?

In n-type substances, the minority carriers are

Which of the following does not undergo plastic deformation?

The young's modulus of water is

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

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

A p-type crystal is

The critical temperature of aluminum is

The SI unit of stress is same as that of

Curie is the unit of

In N-type substances, the minority charge carriers are

At 0 k semi-conductors are

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

Which one of the following is crystalline solid

Each domain behaves like a

A small microscopic region of a substance containing about 10

In p-type substances, the minority carriers are

The critical temperature for aluminum is

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

Which one pair belong to acceptor impurity

The first superconductor was discovered by

The material of a permanent magnet has

Magnetism lags behind the magnetizing current this phenomenon is called

The core of transformer is laminated or reduces

The field produced by an electron is generated by its

The critical temperature of lead is

Curie temperature of iron is

Hysteresis curve is studied in terms of

The practical use of superconductors is

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

Good conductors have conductivities of the order of

A pentavalent impurity is usually called

Which one of the following is a polymeric solid

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

Aluminum, tin and lead are superconductors

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

Above curie temperature iron behaves as

Water copper bismuth and antimony are examples of

The critical temperature for mercury is

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

On doping, the conductivity of semiconductor

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

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

Demagnetization of a magnet can be done by

Domains are exited in

The breaking stress of a material is defined as

The first superconductor was discovered in

The instrument which helps in studying the process of hysteresis is

The retentivity of the steel is

In p-type substances, the majority carriers are

A hole in a p-type semiconductor is

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

The Curie temperature of iron is

Large area of hysteresis loop shows

Energy per unit volume of a stretched wire is

The substance which shows practically no elastic after effect is

A permanent magnetic is made from a materials which is

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

A pure semi-conductor behaves like an insulator at

The young's modulus of steel is

With rise in temperature, the specific resistance of a semiconductor

A trivalent impurity is usually called

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

The modulus of rigidity of a liquid is

The critical temperature of tin is

Yttrium barium copper oxide (YBa₂Cu₃O₇) can become superconductor at

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

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

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

Iron, cobalt and nickel are examples of

Curie temperature of iron is

The critical temperature of mercury is

The modulus of elasticity of a material does not depend upon

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

All the magnetic materials lose their magnetic properties when

To get N-type the Ge is dopped with

Conductors have conductivities of the order of

Which one of the following is not semiconductor?

The energy required to magnetize or demagnetize the material is called

Substances which undergo plastic deformation until they break are known as

Minority carries in p-type substances are

The critical temperature (Te) of lead is

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

The conductivity of semi-conductor is of the order of

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

The critical temperature of aluminum is

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

The most suitable metal for making permanent magnet is