| 1. | A framed structure is perfect, if the number of members are........ (2j-3), where j is the number of joints ? | |
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equal to
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less than
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greater than
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either (b) or (c)
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Report Question| 2. | Two like parallel forces are acting at a distance of 24 mm apart and their resultant is 20 N. It the line of action of the resultant is 6 mm from any given force, the two forces are ? | |
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15 N and 5 N
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20 N and 5 N
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15 N and 15 N
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none of these
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| 3. | The resultant of two forces P and Q (such that P>Q) acting along the same straight line, but in opposite direction, is given by ? | |
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P+Q
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P-Q
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P/Q
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Q/P
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| 4. | The energy possessed by a body, for doing work by virtue of its position, is called ? | |
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potential energy
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kinetic energy
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electrical energy
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chemical energy
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| 5. | The ratio of static friction to dynamic friction is always ? | |
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equal to one
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less than one
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greater than one
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none of these
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| 6. | Which of the following statement is wrong ? | |
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A force acting in the opposite direction to the motion of the body is called force of friction
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The ratio of the limiting friction to the normal reaction is called coefficient of friction
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A machine whose efficiency is 100% is known as an ideal machine
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The velocity ratio of a machine is the ratio of load lifted to the effort applied
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| 7. | The efficiency of a lifting machine is the ratio of ? | |
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output to the input
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work done by the machine to the work done on the machine
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mechanical advantage to the velocity ratio
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all of the above
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| 8. | A number of forces acting at a point will be in equilibrium, if ? | |
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all the forces are equally inclined
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sum of all the forces is zero
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sum of resolved parts in the vertical direction is non-zero (i.e. El?0)
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sum of resolved parts in the horizontal direction is zero (i.e. [H=0)
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| 9. | The bodies which rebound after impact are called ? | |
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inelastic bodies
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elastic bodies
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neither elastic nor inelastic bodies
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none of these
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| 10. | The centre of gravity a T-section 100 mm x 150 mm x 50 mm from its bottom is ? | |
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50mm
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75 mm
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87.5mm
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125mm
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