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1) 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 surfaces e. will be in equilibrium under all conditions
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2) Which of the following is not a vector quantity __________________? a. weight b. velocity c. acceleration d. force e. moment
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3) 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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4) 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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5) Which of the following is a vector quantity___________________? a. energy b. mass c. momentum d. angle e. speed
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6) 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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7) D’ Alembert’s principle is used for______________________? a. reducing the problem of kinetics to equivalent statics problem b. determining stresses in the truss c. stability of floating bodies d. designing safe structures e. solving kinematic problems
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8) According to Lami’s theorem___________________? 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 particle 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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9) 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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10) 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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11) 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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12) 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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13) Center of gravity of a solid cone lies on the axis at the height _____________________? a. one-fourth of the total height above base b. one-third of the total height above base c. one-half of the total height above base d. three-eighth of the total height above the base e. none of the above
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14) The center of percussion of the homogeneous rod of length L suspended at the top will be___________________? a. L/2 b. L/3 c. 3L/4 d. 2L/3 e. 3L/8
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15) Center of gravity of a thin hollow cone lies on the axis at a height of ___________________? a. one-fourth of the total height above base b. one-third of the total height above base c. one-half of the total height above base d. three-eighth of the total height above the base e. none of the above
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16) The units of moment of inertia of mass are ________________? a. kg m2 b. m4 c. kg/m2 d. kg/m e. m2/kg
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17) A heavy string attached at two ends at same horizontal level and when central dip is very small approaches the following curve ____________________? a. catenary b. parabola c. hyperbola d. elliptical e. circular arc
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18) From a circular plate of diameter 6 cm is cut out a circle whose diameter is a radius of the plate. Find the e.g. of the remainder from the center of circular plate____________________? a. 0.5 cm b. 1.0 cm c. 1.5 cm d. 2.5 cm e. 0.25 cm
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19) The center of percussion of a solid cylinder of radius r resting on a horizontal plane will be_________________? a. r/2 b. 2r/3 c. r/A d. 3r/2 e. 3r/A
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20) 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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