Which of them is not a crystalline solid

The branch of physics that deals with the nature and properties of matter in the solid state is called:

Any alternation produced in shapes, length or volume when a body is subjected to some external Force is called

At 0 k, a piece of Ge or .Si is a perfect

Amorphous solids are more like

Sodium chloride exit in the form of

Stress is mathematically expressed as:

Natural rubber has the formula:

When a stress changes the length of a body, it is called

A structure that is intermediate between solid and liquid is called

Force applied on a unit area of a crystal is culled

Which of the following is pentavalent impurity?

The substances which creak just after the elastic limit is reached, arc called

The materials in which valence electrons are bound very tightly to their atoms are known as

The valence band of an atom in a solid

The band above the valence band is called

Silicon and germanium in their pure form near OK is

Polymeric solids have

Glassy solids have:

The value of stress beyond which the body is permanently deformed is called

The ratio of stress to strain is called

Conductors are those materials in which energy gap is

A solid having regular arrangement of molecules throughout its structure is called:

Glass and high carbon steel are the examples of

Which of the following is trivalent impurity?

A semiconductor in its extremely pure form is known as

The unit of modulus of elasticity is

The process of adding a small amount of impurity into the pure semiconductor material is called

Strain is the ratio of

The strain energy stored in any length of wire due to action of stress appears as

The electrons in the outermost shell of an atom are called

SI unit of stress is:

The angular deformation produced in a body is called

The word amorphous means:

The band above the valence band are normally

Amorphous solids are more similar to

The materials in which there are plenty of free electron are called

The ratio Mishear stress to shear strain is called

For semi-conductors narrow forbidden energy gap between the conduction and valence bands of a conductor is of the order of

Under the elastic firm the deformation produced in the material is

A moving hole in a diode behaves like a

In case of linear deformation, the ratio Of tensile stress to tensile strain is called

Polymers may consists of

Which one of the following acts as a positive charge carrier in a semiconductor

Nm² is called

A semi-conductor formed by the addition of a trivalent impurity is called

The force applied on unit area to produce any change in the shape, length or volume of a body is called

A element or compound that has definite shape and volume is called:

The dimensions of strain are

Insulators have conductivities ranging between

SI unit of stress is same as of

The forbidden energy gap of an insulator is of the order of

The reciprocal of bulk modulus is called

Conductors have conductivities of the order of

The smallest three dimensional basic structure in a crystalline solid is called

When stress changes the shape of a body, it is called

Every crystalline solid has:

A n-type semiconductor is obtained by doping germanium or silicon with

Amorphous solids are Also Called

Molecules of solid possess

Stress required to produce a unit strain is called

The ability of any body to return to its original shape is called

When a covalent bond is broken in a doped semiconductor

Young's modulus, mathematically can he written as

A empty or partially filled band is called

The atoms or molecules in a crystalline solids are held together by

conduction based may be

which of the following is polymeric solid?

Insulators are those materials in which energy gap is

SI unit of strain is

The ratio of volumetric stress to volumetric strain is called

The amount of strain energy stored in deformed stretched wire is equal to

Ordinary glass, on heating gradually soften into a paste like state at almost:

Artificial polymers are made by a chemical reaction known

Glass is also known as

Arrangement of molecules in crystalline solids is studied by using:

The electrons occupying the conduction band are known as

The units of modulus of elasticity are the same as those of

The strain energy in a deformed wire of length l acted upon a force F can be graphically calculated by measuring

Conductivity of semiconductor increases by

Materials have specific uses depending upon their characteristics and properties such as:

Stress varies linearly with strain with in ---- limit

Semi-conductor have conductivities of the order of

The maximum stress which a body can bear is called

The dimensions of stress are:

In the doping process, the ratio of the doping atoms to the semiconductor atom is

At room temperature, Ge or Si crystal becomes a

Measure of deformation of a solid when stress is applied to it, is called

The strain produced due to tensile stress is called

A semiconductor formed by the addition of a pentavalent impurity is called

Such a deformation in which the body regains its original shape after the removal of applied stress is called

A stress which changes one dimension only is called

Synthetic materials belong to

The strain produced due to compressive stress is called

Shear modulus, mathematically can be written as

The doped semiconductor materials are called

The whole structure obtained by the repetition of unit cell is known as

Bulk modulus, mathematically can be written as

Which of the following' is a crystalline solid?

Polymeric solids exhibit

Deformation of body may be the change in its

Within elastic limit, strain is directly proportional to stress, is the statement of