Applied Mechanics MCQs with answers Page - 3

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Q. Using force, length and time as fundamental quantities, the dimensions of mass would be

  • (A) FL-2T2
  • (B) FL-1T2
  • (C) FL-1T1
  • (D) FL-2T1

A

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Q. According to the principle of transmissibility of forces, when a force acts upon a body ; its effect is

  • (A) Minimum when it acts at C.G. of the body
  • (B) Maximum when it acts at C.G. of the body
  • (C) Different at different points of body
  • (D) Same at every point in its line of action

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Q. A cannon of barrel length 2 m fires a shell of weight 6 kg with a muzzle velocity of 50 m/sec. The force exerted by the gases on the shell would be approximately

  • (A) 76 t
  • (B) 19 t
  • (C) 152 t
  • (D) 38 t

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Q. A point moves in such a manner that its distance from a fixed point is equal to its distance from a fixed line multiplied by a constant greater than one. The locus of the path traced by the point will be a

  • (A) Cycloid
  • (B) Hyperbola
  • (C) Circle
  • (D) Involute

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Q. In actual machines

  • (A) Mechanical advantage is unity
  • (B) Mechanical advantage is greater than velocity ratio
  • (C) Mechanical advantage is less than velocity ratio
  • (D) Mechanical advantage is less than unity

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Q. The polar moment of inertia of a hollow circular section whose external diameter is 8 cm and internal diameter of 6 cm will be

  • (A) 137.5 cm4
  • (B) 275 cm4
  • (C) 550 cm4
  • (D) 1100 cm4

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Q. Which of the following is not a unit of energy?

  • (A) Joule
  • (B) kW
  • (C) N-m
  • (D) Electron volt

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Q. If a gymnast sitting on a rotating stool, with his arms outstretched suddenly lowers his arm

  • (A) the angular velocity will remain constant
  • (B) the angular momentum will increase
  • (C) the angular velocity will decrease
  • (D) his moment of inertia will decrease

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Q. The y-coordinate of the centroid of the area bounded by the x-axis, the line x = 3 and the parabola y = x2 will be

  • (A) 2.7
  • (B) 2.55
  • (C) 2.6
  • (D) 2.65

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Q. Work done by a body of mass 100 kg moving along a circular path of radius 2 m with a uniform velocity of 10 m/sec is

  • (A) 5000 J
  • (B) 2500 J
  • (C) 509.68 J
  • (D) None of the above

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