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MCQs

Total Questions : 1187 | Page 69 of 119 pages
Question 681. One end of a helical spring is fixed while the other end carries the load W which moves with simple harmonic motion. The frequency of motion is given by(where δ = Deflection of the spring.)
  1.    2π. √(g/δ)
  2.    1/2π. √(g/δ)
  3.    2π. √(δ/g)
  4.    1/2π. √(δ/g)
 Discuss Question
Answer: Option B. -> 1/2π. √(g/δ)
Answer: (b).1/2π. √(g/δ)
Question 682. The efficiency of a screw jack is maximum, when(where α = Helix angle, and φ = Angle of friction.)
  1.    α = 45° + φ/2
  2.    α = 45° - φ/2
  3.    α = 90° + φ
  4.    α = 90° - φ
 Discuss Question
Answer: Option B. -> α = 45° - φ/2
Answer: (b).α = 45° - φ/2
Question 683. The angle of inclination with the vertical is __________ if the cyclist is running at a faster speed than that when he is running at a slower speed.
  1.    more
  2.    less
  3.    Can't say
  4.    None of these
 Discuss Question
Answer: Option A. -> more
Answer: (a).more
Question 684. The moment of inertia of a square of side a about its base is a⁴/ 3.
  1.    True
  2.    False
  3.    Can't say
  4.    None of these
 Discuss Question
Answer: Option A. -> True
Answer: (a).True
Question 685. If the number of pulleys in a system is equal to its velocity ratio, then it is a __________ system of pulleys
  1.    first
  2.    second
  3.    third
  4.    None of these
 Discuss Question
Answer: Option B. -> second
Answer: (b).second
Question 686. If the gravitational acceleration at any place is doubled, then the weight of a body will be
  1.    g/2
  2.    g
  3.    2g
  4.    2g
 Discuss Question
Answer: Option D. -> 2g
Answer: (d).2g
Question 687. The time of flight (t) of a projectile on a horizontal plane is given by
  1.    t = 2u. sinα/g
  2.    t = 2u. cosα/g
  3.    t = 2u. tanα/g
  4.    t = 2u/g.sinα
 Discuss Question
Answer: Option A. -> t = 2u. sinα/g
Answer: (a).t = 2u. sinα/g
Question 688. The velocity ratio for the third system of pulleys is
  1.    n
  2.    n2
  3.    2n
  4.    2n - 1
 Discuss Question
Answer: Option D. -> 2n - 1
Answer: (d).2n - 1
Question 689. The moment of inertia of a sphere of mass m and radius r, about an axis tangential to it, is
  1.    2mr²/3
  2.    2mr²/5
  3.    7mr²/3
  4.    7mr²/5
 Discuss Question
Answer: Option D. -> 7mr²/5
Answer: (d).7mr²/5
Question 690. The moment of inertia of a thin disc of mass m and radius r, about an axis through its centre of gravity and perpendicular to the plane of the disc is
  1.    mr²/2
  2.    mr²/4
  3.    mr²/6
  4.    mr²/8
 Discuss Question
Answer: Option A. -> mr²/2
Answer: (a).mr²/2

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