Water copper bismuth and antimony are examples of

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

Magnetism lags behind the magnetizing current this phenomenon is called

Substances which undergo plastic deformation until they break are known as

The first superconductor was discovered in

Which one pair belong to acceptor impurity

On doping, the conductivity of semiconductor

The critical temperature for mercury is

All the magnetic materials lose their magnetic properties when

Iron, cobalt and nickel are examples of

A pure semi-conductor behaves like an insulator at

The young's modulus of steel is

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

Which is the most suitable material for making permanent magnetic?

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

Good conductors have conductivities of the order of

The breaking stress of a material is defined as

In n-type substances, the minority carriers are

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

The retentivity of the steel is

The SI unit of stress is same as that of

Conductors have conductivities of the order of

Which one of the following is not semiconductor?

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

The modulus of elasticity of a material does not depend upon

The young's modulus of water is

To get N-type the Ge is dopped with

Above curie temperature iron behaves as

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

The critical temperature of mercury is

The area under hysteresis loop is proportional to

In p-type substances, the minority carriers are

The critical temperature of aluminum is

The critical temperature of tin is

A permanent magnetic is made from a materials which is

Minority carries in p-type substances are

Aluminum, tin and lead are superconductors

A small microscopic region of a substance containing about 10

Which of the following substance has highest elasticity?

Large area of hysteresis loop shows

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

Which one is pentavalent impurity?

The Curie temperature of iron is

Hysteresis curve is studied in terms of

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

Each domain behaves like a

In p-type substances, the majority carriers are

The most suitable metal for making permanent magnet is

Curie is the unit of

At 0 k semi-conductors are

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

Which one of the following is crystalline solid

Domains are exited in

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

The curie temperature for iron is about

The critical temperature for aluminum is

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

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

The energy required to magnetize or demagnetize the material is called

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

A hole in a p-type semiconductor is

A p-type crystal is

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

The modulus of rigidity of a liquid is

A trivalent impurity is usually called

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

The practical use of superconductors is

The instrument which helps in studying the process of hysteresis is

The substance which shows practically no elastic after effect is

Demagnetization of a magnet can be done by

The first superconductor was discovered by

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

The conductivity of semi-conductor is of the order of

Yttrium barium copper oxide (YBa₂Cu₃O₇) can become superconductor at

With rise in temperature, the specific resistance of a semiconductor

The critical temperature of aluminum is

When a magnet is heated it

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

The critical temperature of lead is

Curie temperature of iron is

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

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

Which of the following does not undergo plastic deformation?

The field produced by an electron is generated by its

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

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

Curie temperature of iron is

Energy per unit volume of a stretched wire is

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

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

The critical temperature (Te) of lead is

In N-type substances, the minority charge carriers are

The core of transformer is laminated or reduces

Which one of the following is a polymeric solid

A pentavalent impurity is usually called

The material of a permanent magnet has

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

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

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

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

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