Isotropic materials are those which have the same

Isotropic materials have the same __________ in all directions.

A

Induced stresses

B

Density

C

Elastic properties

D

Thermal properties

Isotropic materials have the same __________ in all the directions.

A

Thermal properties

B

Elastic properties

C

Stresses

D

All of the above

The materials which fracture even at small strains are termed as brittle, while those materials which exhibit an appreciable deformation before failure are termed as

A

Rigid

B

Tough

C

Ductile

D

Plastic

Thermoplastic materials are those materials which

A

Do not become hard with the application of heat and pressure and no chemical change occurs

B

Are flexible and can withstand considerable wear under suitable conditions

C

Are formed into shape under heat and pressure and results in a permanently hard product

D

Are used as a friction lining for clutches and brakes

Which of the following relationships is correct for relating the three elastic constants of an isotropic elastic material (where, E = Young's modulus, G = Modulus of rigidity or shear modulus v = Poisson's ratio)?

A

E = 2G (1 + v)

B

E = G (1 + v)

C

$${\text{E}} = \frac{{{\text{G}}\left( {1 + {\text{v}}} \right)}}{2}$$

D

E = 2G (1 + 2v)

While propagating through homogeneous, isotropic media,

A

Directions of both the fields are orthogonal

B

Both the fields are at right angles to the direction of propagation

C

Both (A) and (B)

D

Neither (A) nor (B)

The power gain of a half-wave dipole with respect to an isotropic radiator is

A

2.15 db

B

3 db

C

4.15 db

D

6 db

In a simple bending theory, one of the assumptions is that the material of the beam is isotropic. This assumption means that the

A

Normal stress remains constant in all directions

B

Normal stress varies linearly in the material

C

Elastic constants are same in all the directions

D

Elastic constants varies linearly in the material

In isotropic turbulence, the __________ are equal to each other.

A

Temporal velocity components

B

Mean square of velocity fluctuations in the three co-ordinate directions

C

Root mean square of velocity fluctuations in the three co-ordinate directions

D

None of these

Isotropic turbulence occurs

A

Where there is no velocity gradient

B

At higher temperatures

C

Only in Newtonion fluids

D

None of these

Isotropic materials are those which have the same

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