Applied Mechanics MCQs with answers Page - 48

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

  • (A) FL-2T+2
  • (B) FL-1T+2
  • (C) FL-1T+1
  • (D) 107 dynes

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Q. Minimum horsepower of pump required for filling 50m3 water tank, 20 metres high from ground in 30 minutes by lifting water from a well 5 metres below the ground level is

  • (A) 5.45 KW
  • (B) 7.5 KW
  • (C) 6.81 KW
  • (D) Tapered bearing

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Q. A weight of 4.9 N rests on a rough horizontal floor that has a coefficient of friction of 0.5. If g = 9.8 m/s2, the smallest horizontal force that gives the weight an acceleration of 4m/s2 is most nearly

  • (A) 2.5 N
  • (B) 3 N
  • (C) 2 N
  • (D) 4.5 N

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Q. The units of moment of inertia of an area are

  • (A) kg - m
  • (B) m4
  • (C) kg - m4
  • (D) kg - m3

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Q. Te dimensions of frequency are

  • (A) 107 dynes
  • (B) MLT
  • (C) L-1
  • (D) T-1

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Q. Instantaneous centre for a rolling wheel on a straight track will be at

  • (A) 107 dynes
  • (B) A
  • (C) B
  • (D) D

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Q. A 100 kg flywheel having a radius of gyration of 1 m is rotating at 1000 rpm. The angular momentum of the flywheel about its axis of rotation, in kg m2/s is

  • (A) 1000
  • (B) 107 dynes
  • (C) 10,000
  • (D) 10,470

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Q. M.I. of sphere of 0.5 m radius about a mutually perpendicular axis (Z-axis) when its M.I. about X-axis and Y-axis are 50 kgm2 and 50 kgm2 is

  • (A) 50 Kgm2
  • (B) Tapered bearing
  • (C) 100 Kgm2
  • (D) 25 Kgm2

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Q. A cylindrical bar 10 metres long elongates 0.1 mm under a load. The strain in the material of the bar will be

  • (A) 10--4
  • (B) 10--5
  • (C) ---
  • (D) ---

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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) 107 dynes
  • (C) 275 cm4
  • (D) 550 cm4

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