strength of material question

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1.if arod expand freely due to heating .it will develop.
a.Bending stress
b.Thermal stress
c.No stress
d.compressive stress

2.materials which show direction dependent properties are called
a.homogenious
b.viscoelastic
c.isotropic
d.anisotropic

3.if apiece of material neither expand nor contract in volume when subjected to stress then the  poisson ratio must be
a.zero
b..25
c..33
d..5

4.what is the relationship between elastic constants E,G, and K
a.E=KG/9K+G
b.E=9KG/K+G
c.E=9KG/K+3G
d.E=9KG/3K+G

5.maxium shear stress in a mohrs circle
a.is equal to radius of mohrs circle
b.is greater than radius of mohrs circle
c.is less than radius of mohrs circle
d.could be aby the above.

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