Applied Mechanics MCQs with answers Page - 1

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Q. An iron sphere of mass 30 kg and an aluminium sphere of mass 10 kg, both having the same diameter are dropped vertically from a cliff. When they are 10 metrs from the ground, they have identical

  • (A) Accelerations
  • (B) Momenta
  • (C) Kinetic energies
  • (D) Potential energies

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Q. A force F = 2i + 3j - k is passing through the origin. Its moment about point (1, 1, 0) is

  • (A) 107 dynes
  • (B) i + j + k
  • (C) 2i + 3j
  • (D) zero

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Q. A stone dropped from a baloon that was ascending at the rate of 30 ft/sec, reaches ground after 10 secs. The height of the baloon where stone was dropped was

  • (A) 3420 ft
  • (B) 107 dynes
  • (C) 4520 ft
  • (D) 1310 ft

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Q. If three non-parallel forces hold a rigid body in equilibrium, they must

  • (A) be non-coneurrent
  • (B) be colinear
  • (C) 107 dynes
  • (D) be concurrent

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Q. The gravitational field at the surface of the moon is one sixth of that at the surface of the earth. A 72 kg man weighs on the surface of the moon

  • (A) 137.7 N
  • (B) 250
  • (C) 72 N
  • (D) 117.7 N

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Q. Which of the following is scalar quantity

  • (A) Area of triangle
  • (B) Displacement of a particle
  • (C) Acceleration of car
  • (D) Force of friction

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Q. If a solid sphere rolls on a horizontal surface, then the ratio of its rotational kinetic energy to its total kinetic energy is

  • (A) 1 ; 7
  • (B) 3 ; 7
  • (C) 107 dynes
  • (D) 2 ; 7

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Q. The limiting force of fiction is

  • (A) The friction force acting on a body when it is in motion
  • (B) The value of friction force which stops the movement of the body
  • (C) The value of friction force which cannot exceed under a situation
  • (D) The friction force acting when the body is just about to move

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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) 10--7
  • (D) All of the above

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Q. Three forces A, B and C of magnitudes 8 N, 12 N and 20 N acting on a particle are in equilibrim. It can be concluded that

  • (A) 107 dynes
  • (B) B and C act in opposite directions
  • (C) one of the forces in non-coplaner
  • (D) A and B act at 90?

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