15. The ratio of shear stress and shear strain of an elastic material, is

A. Modulus of Rigidity

B. Shear Modulus

C. Young's Modulus

D. both (a) and (b).

16. A load of 1960 N is raised at the end of a steel wire. The minimum diameter of the wire so that stress in the wire does not exceed 100 N/mm2 is

A. 40 mm

B. 4.5 mm

C. 5.0 mm

D. 5.5. mm

17. The normal component of a force inclined through 0? is obtained by multiplying the force by

A. sin 0

B. cos 0

C. tan 0

D. sin 0 cos 0

18. The tangential component of stress on an plane inclined 0? to the direction of the force, may be obtained by multiplying the normal stress by

A. sin 0

B. cos 0

C. tan 0

D. sin2 0.

19. he ratio of tangential and normal components of a stress on an inclined plane through 0? to the direction of the force, is

A. sin 0

B. cos 0

C. tan 0

D. cos 0

20. The normal and tangential components of stress on an inclined plane through 0? to the direction of the force, will be equal if 0 is

A.- 45?

B. 30?

C. 60?

D. 90?.

21. If the normal stresses due to longitudinal and transverse loads on a bar are csi and a2 respectively, the tangential component of the stress on an inclined plane through 0?, the longitudinal load is

A. al sin 0 + 02 cos 0

B. al sin 02 + 02 cos2 0

C. (01 ? a2)sin 20

D. (a1 + 02)sin 20

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