1.  A body is said to be in equilibrium if
A. it moves horizontally
B. it moves vertically
C. it rotates about its C.G.
D. none of these.

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2.  If EH and IV are the algebraic sums of the forces resolved horizontally and vertically respectively, and EM is the algebraic sum of the moments of forces dbout any point, for the equilibrium of the body acted upon
A. EH = 0
B. EV = 0
C. Elll = 0
D. all the above.

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3. The forces acting normally on the cross section of a bar shown in Fig. 21.1 introduce
A. compressive stress
B. tensile stress
C. shear stress
D. none of these.

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4. The forces acting normally on the cross sec- Fig. 21.1 don of a bar shown in Fig. 21.2 introduce
A. compressive streSs
B. tensile stress
C. shear stress
D. none of these.

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5.  The forces acting on the bar as shown in Fig. 21.3 introduce
A. compressive stress
B. tensile stress
C. shear stress
D. none of these.

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6. Stress may be defined as
A. force per unit length
B. force per unit volume
C. force per unit area
D. none of these.

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7. Stress may be expressed in Newtons
A. per millimetre square (N/mm2)
B. per centimetre square (N/cm2)
C. per metre square (N/m2)
D. none of these.

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