Applied Mechanics and Graphic Statics

251. The length of a Second's pendulum, is

  1. 99.0 cm
  2. 99.4 cm
  3. 100 cm
  4. 101 cm

Correct answer: (B)
99.4 cm

252. The locus of the instantaneous centre of a moving rigid body, is

  1. Straight line
  2. Involute
  3. Centroid
  4. Spiral

Correct answer: (C)
Centroid

253. The masses of two balls are in the ratio of 2 : 1 and their respective velocities are in the ratio of 1 : 2 but in opposite direction before impact. If the coefficient of restitution is ½, the velocities of separation of the balls will be equal to

  1. Original velocity in the same direction
  2. Half the original velocity in the same direction
  3. Half the original velocity in the opposite direction
  4. Original velocity in the opposite direction

Correct answer: (D)
Original velocity in the opposite direction

254. The maximum displacement of a particle executing S.H.M. corresponds to

  1. Zero potential energy and maximum kinetic energy
  2. Zero kinetic energy and maximum potential energy
  3. Maximum kinetic energy and maximum potential energy
  4. Minimum kinetic energy and minimum potential energy

Correct answer: (B)
Zero kinetic energy and maximum potential energy

255. The maximum frictional force which comes into play, when a body just begins to slide over the surface of a another body, is known

  1. Sliding friction
  2. Rolling friction
  3. Limiting friction
  4. None of these

Correct answer: (C)
Limiting friction

256. The maximum pull in a cable, carrying a uniformly distributed load and supported at two ends which are at the same level, is at

  1. Supports
  2. Quarter span
  3. Mid span
  4. None of the above

Correct answer: (A)
Supports

257. The maximum value of the horizontal range for a projectile projected with a velocity of 98 m/sec is

  1. 98 m
  2. 490 m
  3. 980 m
  4. 1960 m

Correct answer: (C)
980 m

258. The maximum velocity of a body vibrating with a simple harmonic motion of amplitude 150 mm and frequency 2 vibrations/sec, is

  1. 188.5 m/sec
  2. 18.85 m/sec
  3. 1.885 m/sec
  4. 0.18845 m/sec

Correct answer: (C)
1.885 m/sec

259. The mechanical advantage of an ideal machine is 100. For moving the local through 2 m, the effort moves through

  1. 0.02 m
  2. 2 m
  3. 2.5 m
  4. 20 m

Correct answer: (A)
0.02 m

260. The member forces in a statically in determinate truss

  1. Can be obtained by graphic statics
  2. Cannot be obtained by graphic statics
  3. May be obtained by graphic statics
  4. Can be obtained by graphic statics by trial and error

Correct answer: (B)
Cannot be obtained by graphic statics

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