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MCQs

Total Questions : 1187 | Page 68 of 119 pages
Question 671. The polygon law of forces states that if a number of forces, acting simultaneously on a particle, be represented in magnitude and direction by the sides a polygon taken in order, then their resultant is represented in magnitude and direction by the closing side of the polygon, taken in opposite direction.
  1.    Correct
  2.    Incorrect
  3.    Can't say
  4.    None of these
 Discuss Question
Answer: Option A. -> Correct
Answer: (a).Correct
Question 672. The total energy possessed by a system of moving bodies
  1.    is constant at every instant
  2.    varies from point to point
  3.    is maximum in the start and minimum at the end
  4.    is minimum in the start and maximum at the end
 Discuss Question
Answer: Option A. -> is constant at every instant
Answer: (a).is constant at every instant
Question 673. The velocity of a particle (v) moving with simple harmonic motion, at any instant is given by(where r = Amplitude of motion, and y = Displacement of the particle from mean position.)
  1.    ω.√(y² - r²)
  2.    ω.√(r² - y²)
  3.    ω².√(y² - r²)
  4.    ω².√(r² - y²)
 Discuss Question
Answer: Option B. -> ω.√(r² - y²)
Answer: (b).ω.√(r² - y²)
Question 674. In a screw jack, the effort required to lower the load is __________ the effort required to raise the same load.
  1.    less than
  2.    equal to
  3.    more than
  4.    None of these
 Discuss Question
Answer: Option A. -> less than
Answer: (a).less than
Question 675. The maximum height of a projectile on a horizontal plane, is
  1.    u² sin²α/2g
  2.    u² cos²α/2g
  3.    u² sin²α/g
  4.    u² cos²α/g
 Discuss Question
Answer: Option A. -> u² sin²α/2g
Answer: (a).u² sin²α/2g
Question 676. The static friction
  1.    bears a constant ratio to the normal reaction between the two surfaces
  2.    is independent of the area of contact, between the two surfaces
  3.    always acts in a direction, opposite to that in which the body tends to move
  4.    all of the above
 Discuss Question
Answer: Option D. -> all of the above
Answer: (d).all of the above
Question 677. The unit of work in S.I. units is
  1.    newton
  2.    erg
  3.    kg-m
  4.    joule
 Discuss Question
Answer: Option D. -> joule
Answer: (d).joule
Question 678. If the body falls freely under gravity, then the gravitational acceleration is taken as
  1.    +8.9 m/s²
  2.     -8.9 m/s²
  3.     +9.8 m/s²
  4.     -9.8 m/s²
 Discuss Question
Answer: Option C. -> +9.8 m/s²
Answer: (c). +9.8 m/s²
Question 679. The rate of change of displacement of a body is called
  1.    velocity
  2.    acceleration
  3.    momentum
  4.    none of these
 Discuss Question
Answer: Option A. -> velocity
Answer: (a).velocity
Question 680. The periodic time (T) is given by(where ω = Angular velocity of particle in rad / s.)
  1.    ω/2π
  2.    2π/ω
  3.    2π x ω
  4.    π/ω
 Discuss Question
Answer: Option B. -> 2π/ω
Answer: (b).2π/ω

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