Applied Mechanics MCQs with answers Page - 4

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Q. A stone is thrown up from the foot of tower 50 m high with a velocity of 25 m/sec and at the same time another stone is dropped from the top of tower, the two stones will cross each other after

  • (A) 3 sec
  • (B) 5 sec
  • (C) 4 sec
  • (D) 2 sec

A

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Q. The moment of a force is

  • (A) Equivalent to the algebraic sum of the moments acting on a body
  • (B) Equivalent to the sum of horizontal as well as vertical components of the moments on a body
  • (C) Equivalent to the sum of the moments acting on a body
  • (D) Equivalent to the sum of horizontal components of the moments on a body

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Q. A gun fires shell with a muzzle velocity of 600 m/sec. The angle of inclination of the gun so that the shell hits a target at a distance of 32 km at level 100 m higher than the gun would be approximately?

  • (A) 60?
  • (B) 45?
  • (C) 30?
  • (D) Either of (A) and (C)

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Q. A crate weighing 40 kg rests on a cart moving with an acceleration W. The coefficient of friction between the cart and the crate is

  • (A) 2.45 m/sec2
  • (B) 4.00 m/sec2
  • (C) 0.25 m/sec2
  • (D) 4.16 m/sec2

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Q. A flywheel 200 cm in diameter is rotating at 100 rpm. A point one the rim of the flywheel will not have

  • (A) angular velocity
  • (B) centripetal acceleration
  • (C) tangential acceleration
  • (D) all of the above

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Q. A man wished to move a block of size 3 m x 3 m weighing 80 kg. The coefficient of friction between the block and the ground is 0.27. Which of the following methods should be used?

  • (A) Slide along the ground by pushing
  • (B) Ask for cranes
  • (C) Pull it
  • (D) Tip it over

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Q. The centroid of a triangle is at the inter-section of

  • (A) perpendicular bisectors
  • (B) base and perpendicular from opposite vertex
  • (C) perpendiculars down from the corners
  • (D) medians

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Q. If there are 3 pulleys in the first system, then the velocity ratio of this system will be

  • (A) 8
  • (B) 2
  • (C) 4
  • (D) 6

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Q. A locomotive of weight 100 tonnes is attached to train of wagons weighing 1000 tonnes. The locomotive pulls the wagons with a constant velocity of 36 km/hour. When the coupling between the train and wagons breaks, the wagons roll on 95 m in 10 sec. The distance between the locomotive and the wagons at this instant assuming that the forces acting on the train are unaltered would be

  • (A) 0.36 m
  • (B) 0.44 m
  • (C) 0.77 m
  • (D) 0.5 m

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Q. A dash pot consists of a cylinder 10 cm in diameter in which slides a piston 12 cm long having a radial clearance of 1 mm. The cylinder is filled with oil having a viscosity of 1 poise. What will be the resistance offered by the piston to sliding with a velocity of 3 cm/sec

  • (A) 1090 kg
  • (B) 100 kg
  • (C) 10900 kg
  • (D) 10 kg

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