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1) A trolley wire weighs 1.2 kg per meter length. The ends of the wire are attached to two poles 20 meters apart. If the horizontal tension is 1500 kg find the dip in the middle of the span________________? a. 2.5 cm b. 3.0 cm c. 4.0 cm d. 5.0 cm e. 2.0 cm
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2) The possible loading in various members of framed structures are_______________? a. compression or tension b. buckling or shear c. shear or tension d. all of the above e. bending
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3) The center of gravity of a triangle lies at the point of__________________? a. concurrence of the medians b. intersection of its altitudes c. intersection of bisector of angles d. intersection of diagonals e. all of the above
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4) The units of moment of inertia of an area are_______________? a. kg m2 b. m4 c. kg/m2 d. m3 e. kg/m4
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5) Center of percussion is______________? a. the point of C.G. b. the point of metacentre c. the point of application of the resultant of all the forces tending to cause a body to rotate about a certain axis d. point of suspension e. the point in a body about which it can rotate horizontally and oscillate under the influence of gravity
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6) The center of gravity of a uniform lamina lies at_______________? a. the center of heavy portion b. the bottom surface c. the mid point of its axis d. all of the above e. none of the above
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7) The product of either force of couple with the arm of the couple is called________________? a. resultant couple b. moment of the forces c. resulting couple d. moment of the couple e. none of the above
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8) Two coplanar couples having equal and op-posite moments_________________? a. balance each other b. produce a couple and an unbalanced force c. are equivalent d. produce a moment of couple e. can not balance each other
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9) A heavy ladder resting on floor and against a vertical wall may not be in equilibrium, if______________? a. the floor is smooth, the wall is rough b. the floor is rough, the wall is smooth c. the floor and wall both are smooth surfaces d. the floor and wall both are rough sur-faces e. will be in equilibrium under all condi-tions
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10) If a rigid body is in equilibrium under the action of three forces, then_______________? a. these forces are equal b. the lines of action of these forces meet in a point c. the lines of action of these forces are parallel d. B. and C. above e. none of the above
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11) According to principle of moments_________________? a. if a system of coplanar forces is in equilibrium, then their algebraic sum is zero b. if a system of coplanar forces is in equilibrium, then the algebraic sum of their moments about any point in their plane is zero c. the algebraic sum of the moments of any two forces about any point is equal to moment of theiwesultant about the same point d. positive and negative couples can be balanced e. none of the above
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12) According to law of triangle of forces______________? a. three forces acting at a point will be in equilibrium b. three forces acting at a point can be represented by a triangle, each side being proportional to force c. if three forces acting upon a patticle are represented in magnitude and direction by the sides of a triangle, taken in order, they will be in equilibr d. if three forces acting at a point are in equilibrium, each force is proportional to the sine of the angle between the other two e. none of the above
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13) Two non-collinear parallel equal forces acting in opposite direction________________? a. balance each other b. constitute a moment c. constitute a couple d. constitute a moment of couple e. constitute a resultant couple
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14) The magnitude of two forces, which when acting at right angle produce resultant force of VlOkg and when acting at 60° produce resultant of Vl3 kg. These forces are____________________? a. 2 and V6 b. 3 and 1 kg c. V5andV5 d. 2 and 5 e. none of the above
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15) Which of the following is not a scalar quantity__________________? a. time b. mass c. volume d. density e. acceleration
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16) The forces, which meet at one point, but their lines of action do not lie in a plane, are called______________? a. coplanar non-concurrent forces b. non-coplanar concurrent forces c. non-coplanar non-concurrent forces d. intersecting forces e. none of the above
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17) Which of the following is not the unit of pressure ? a. kg/cm b. ata c. atmosphere d. mm of wcl e. newton
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18) The unit of work or energy in S.I. units is________________? a. newton b. pascal c. kilogram meter d. watt e. joule
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