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MCQs

Total Questions : 1187 | Page 65 of 119 pages
Question 641. According to the law of moments, if a number of coplaner forces acting on a particle are in equilibrium, then
  1.    their algebraic sum is zero
  2.    their lines of action are at equal distances
  3.    the algebraic sum of their moments about any point in their plane is zero
  4.    the algebraic sum of their moments about any point is equal to the moment of their resultant force about the same point.
 Discuss Question
Answer: Option C. -> the algebraic sum of their moments about any point in their plane is zero
Answer: (c).the algebraic sum of their moments about any point in their plane is zero
Question 642. If u1 and u2 are the velocities of two moving bodies in the same direction before impact and v1 and v2 are their velocities after impact, then coefficient of restitution is given by
  1.    v1-v2/u1-u2
  2.    v2-v1/u1-u2
  3.    u1-u2/v1-v2
  4.    u2+u1/v2+v1
 Discuss Question
Answer: Option B. -> v2-v1/u1-u2
Answer: (b).v2-v1/u1-u2
Question 643. The centre of gravity of a semi-circle lies at a distance of __________ from its base measured along the vertical radius.
  1.    3r/ 8
  2.    4r/ 3π
  3.    8r/3
  4.    3r/4π
 Discuss Question
Answer: Option B. -> 4r/ 3π
Answer: (b).4r/ 3π
Question 644. Newton's second law motion __________ a relation between force and mass of a moving body.
  1.    gives
  2.    does not give
  3.    Can't say
  4.    None of these
 Discuss Question
Answer: Option A. -> gives
Answer: (a).gives
Question 645. The periodic time of one oscillation for a simple pendulum is(where l = Length of the pendulum.)
  1.    (1/2π). √(l/g)
  2.    (1/2π). √(g/l)
  3.    2π. √(l/g)
  4.    None of these
 Discuss Question
Answer: Option C. -> 2π. √(l/g)
Answer: (c).2π. √(l/g)
Question 646. The resultant of two forces P and Q acting at an angle θ is
  1.    P² + Q² + 2P sin θ
  2.    P² + Q² + 2PQ cos θ
  3.    P² + Q² + 2PQ tan θ
  4.    √(P² + Q² + 2PQ cos θ)
 Discuss Question
Answer: Option D. -> √(P² + Q² + 2PQ cos θ)
Answer: (d).√(P² + Q² + 2PQ cos θ)
Question 647. Which of the following are vector quantities?
  1.    Linear displacement
  2.    Linear velocity
  3.    Linear acceleration
  4.    all of these
 Discuss Question
Answer: Option D. -> all of these
Answer: (d).all of these
Question 648. The maximum acceleration of a particle moving with simple harmonic motion is
  1.    ω
  2.    ωr
  3.    ω²r
  4.    ω/r
 Discuss Question
Answer: Option C. -> ω²r
Answer: (c).ω²r
Question 649. Moment of inertia of a triangular section of base (b) and height (h) about an axis through its base, is
  1.    bh3/4
  2.    bh3/8
  3.    bh3/ 12
  4.    bh3/ 36
 Discuss Question
Answer: Option C. -> bh3/ 12
Answer: (c).bh3/ 12
Question 650. If a number of forces acting at a point be represented in magnitude and direction by the three sides of a triangle, taken in order, then the forces are not in equilibrium.
  1.    Agree
  2.    Disagree
  3.    Can't say
  4.    None of these
 Discuss Question
Answer: Option B. -> Disagree
Answer: (b).Disagree

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