Lakshya Education MCQs

Question: If two equal forces of magnitude ‘p’ act at an angle ‘θ’, their resultant, will be
Options:
A. P cos θ/2
B. 2P sin θ/2
C. P tan θ/2
D. 2P cos θ/2
Answer: Option D

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Question 1. Varingon’s theorem of moment’s states
  1.     Arithmetical sum of the moments of two forces about any point, is equal to the moments of their resultant about that point
  2.     Algebraic sum of the moments of two forces about any point, is equal to the moment of their resultant about that point
  3.     Arithmetical sum of the moments of the forces about any point in their plane, is equal to the moment of their resultant about that point
  4.     Algebraic sum of the moments of the forces about any point in their plane, is equal to the moment of their resultant about that point
Answer: Option D
Question 2. In the structure shown in below figure, the member which carries zero force, is
  1.     AB
  2.     BC
  3.     BE
  4.     All the above
Answer: Option D
Question 3. The resultant of two forces acting at right angles is 5 kgf and if they act at an angle of 60°, it is 37 kgf. the magnitudes of the forces are:
  1.     2 kgf, 3 kgf
  2.     3 kgf, 4 kgf
  3.     4 kgf, 5 kgf
  4.     5 kgf, 3 kgf
Answer: Option B
Question 4. The units of inertia of mass are
  1.     kg/m
  2.     kg/m²
  3.     m⁴
  4.     kg-m²
Answer: Option D
Question 5. Lami's theorem states that
  1.     Three forces acting at a point are always in equilibrium
  2.     If three forces acting on a point can be represented in magnitude and direction by the sides of a triangle, the point will be in the state of equilibrium
  3.     Three coplanar forces acting at a point will be in equilibrium, if each force is proportional to the sine of the angle between the other two
  4.     Three coplanar forces acting at a point will be in equilibrium if each force is inversely proportional to the sine of the angle between the other two
Answer: Option C
Question 6. The maximum frictional force which comes into play, when a body just begins to slide over the surface of a another body, is known
  1.     Sliding friction
  2.     Rolling friction
  3.     Limiting friction
  4.     None of these
Answer: Option C

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