6. A bar of copper and steel form a composite system, which is heated to a temperature of 40°C. The stress induced in the copper bar will be-
A. compressive
B. tensile
C. shear
D. zero
7. In a thick cylindrical shell subjected to internal pressure (p), the tangential stress across the thickness of a cylinder is-
A. maximum at the outer surface and minimum at the inner surface
B. maximum at the outer surface and zero at the inner surface
C. maximum at the inner surface and minimum at the outer surface
D. maximum at the inner surface and zero at the outer surface
8. When a shaft is subjected to a twisting moment, every cross-section of the shaft will be under-
A. tensile stress
B. compressive stress
C. shear stress
D. bending stress
9. The maximum shear stress developed in a beam of rectangular section is ______ the average shear stress-
A. 1.5 times
B. 4 times
C. 2 times
D. equal
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10. A body is subjected to a tensile stress of 1200 MPa on one plane and another tensile stress of 600 MPa on a plane at right angles to the former. It is also subjected to a shear stress of 400 MPa on the same planes. The maximum shear stress will be-
A. 500 MPa
B. 1000 MPa
C. 1500 MPa
D. 1600 Mpa