Lakshya Education MCQs

Question: The law of motion involved in the recoil of gun is
Options:
A. Newton's first law of motion
B. Newton's second law of motion
C. Newton's third law of motion
D. None of these
Answer: Option C

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Question 1. The moment of inertia of a thin rod of mass 'm' and length 'l', about an axis through its centre of gravity and perpendicular to its length is
  1.     ml2/4
  2.     ml2/ 6
  3.     ml2/8
  4.     ml2/12
Answer: Option D
Question 2. The maximum efficiency of a lifting machine is
  1.     1/m
  2.     V.R./m
  3.     m/V.R.
  4.     1/(m × V.R.)
Answer: Option D
Question 3. The resultant of two forces p and q (such that p > q) acting along the same straight line, but in opposite direction, is given by
  1.     P + Q
  2.     P - Q
  3.     P / Q
  4.     Q / P
Answer: Option B
Question 4. A body of weight 'w' is required to move up on rough inclined plane whose angle of inclination with the horizontal is 'α'. the effort applied parallel to the plane is given by (where μ = tanφ = coefficient of friction between the plane and the body.)
  1.     P = W tanα
  2.     P = W tan (α + φ)
  3.     P = W (sinα + μcosα)
  4.     P = W (cosα + μsinα)
Answer: Option C
Question 5. The below figure shows the three coplanar forces p, q and r acting at a point o. if these forces are in equilibrium, then
  1.     P/sin β = Q/sin α = R/sin ɣ
  2.     P/sin α = Q/sin β = R/sin ɣ
  3.     P/sin ɣ = Q/sin α = R/sin β
  4.     P/sin α = Q/sin ɣ = R/sin β
Answer: Option B
Question 6. The below figure shows the three coplanar forces p, q and r acting at a point o. if these forces are in equilibrium, then
  1.     P/sin β = Q/sin α = R/sin ɣ
  2.     P/sin α = Q/sin β = R/sin ɣ
  3.     P/sin ɣ = Q/sin α = R/sin β
  4.     P/sin α = Q/sin ɣ = R/sin β
Answer: Option B

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