Lakshya Education MCQs

Question: The condition of equilibrium for any system of forces in a plane is
Options:
A. That polygon of forces must close
B. That resultant couple must be zero
C. Both (A) and (B)
D. None of the above
Answer: Option C

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Question 1. If a body is lying on a plane whose inclination with the horizontal is less than the angle of friction, theni. a force is required to move the body upwardsii. a force is required to move the body downwardiii. the body will not be in equilibriumthe correct answer is
  1.     only (i)
  2.     only (ii)
  3.     both (i) and (ii)
  4.     both (i) and (iii)
Answer: Option C
Question 2. A 2 m long ladder rests against a wall and makes an angle of 30° with the horizontal floor. where will be the instantaneous center of rotation when the ladder starts slipping ?i. 1.0 in from the wallii. 1.732 m from the walliii. 1.0 m above the flooriv. 1.732 m above the floorthe correct answer is
  1.     (i) and (iii)
  2.     (i) and (iv)
  3.     (ii) and (iii)
  4.     (ii) and (iv)
Answer: Option D
Question 3. The force acting on a point on the surface of a rigid body may be considered to act
  1.     At the centre of gravity of the body
  2.     On the periphery of the body
  3.     On any point on the line of action of the force
  4.     At any point on the surface normal to the line of action of the force
Answer: Option C
Question 4. A 2 m long ladder rests against a wall and makes an angle of 30° with the horizontal floor. where will be the instantaneous center of rotation when the ladder starts slipping ?i. 1.0 in from the wallii. 1.732 m from the walliii. 1.0 m above the flooriv. 1.732 m above the floorthe correct answer is
  1.     (i) and (iii)
  2.     (i) and (iv)
  3.     (ii) and (iii)
  4.     (ii) and (iv)
Answer: Option D
Question 5. A 2 m long ladder rests against a wall and makes an angle of 30° with the horizontal floor. where will be the instantaneous center of rotation when the ladder starts slipping ?i. 1.0 in from the wallii. 1.732 m from the walliii. 1.0 m above the flooriv. 1.732 m above the floorthe correct answer is
  1.     (i) and (iii)
  2.     (i) and (iv)
  3.     (ii) and (iii)
  4.     (ii) and (iv)
Answer: Option D
Question 6. If a body is lying on a plane whose inclination with the horizontal is less than the angle of friction, theni. a force is required to move the body upwardsii. a force is required to move the body downwardiii. the body will not be in equilibriumthe correct answer is
  1.     only (i)
  2.     only (ii)
  3.     both (i) and (ii)
  4.     both (i) and (iii)
Answer: Option C

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