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MCQs

Total Questions : 1284 | Page 122 of 129 pages
Question 1211. The centre of gravity of a homogeneous body is the point at which the whole
  1.    All listed here
  2.    Volume of the body is assumed to be concentrated
  3.    Weight of the body is assumed to be concentrated
  4.    Area of the surface of the body is assumed to be concentrated
 Discuss Question
Answer: Option C. -> Weight of the body is assumed to be concentrated
Question 1212. The following is in unstable equilibrium
  1.    A satellite encircling the earth
  2.    A uniform solid cone resting on its base on a horizontal plane
  3.    A solid cube resting on one edge
  4.    A uniform solid cone resting on a generator on a smooth horizontal plane
 Discuss Question
Answer: Option C. -> A solid cube resting on one edge
Question 1213. Time required to stop a car moving with a velocity 20 m/sec within a distance of 40 m, is
  1.    4 sec
  2.    2 sec
  3.    5 sec
  4.    3 sec
 Discuss Question
Answer: Option A. -> 4 sec
Question 1214. If the resultant of two forces ‘P’ and ‘Q’ acting at an angle ‘θ’ makes an angle ‘α’ with ‘P’, then tan α equals
  1.    Q sin θ/P + Q cos θ
  2.    P sin θ/P - Q cos θ
  3.    Q sin θ/P + Q sin θ
  4.    P sin θ/P + Q tan θ
 Discuss Question
Answer: Option A. -> Q sin θ/P + Q cos θ
Question 1215. A uniform rod 9 m long weighing 40 kg is pivoted at a point 2 m from one end where a weight of 120 kg is suspended. The required force acting at the end in a direction perpendicular to rod to keep it equilibrium, at an inclination 60° with horizontal, is
  1.    60 kg
  2.    40 kg
  3.    10 kg
  4.    100 kg
 Discuss Question
Answer: Option C. -> 10 kg
Question 1216. If the resultant of two forces has the same magnitude as either of the force, then the angle between the two forces is
  1.    45°
  2.    120°
  3.    30°
  4.    60°
 Discuss Question
Answer: Option B. -> 120°
Question 1217. A sphere and a cylinder having the same mass and radii start from rest and roll down the same inclined plane. Which body gets to the bottom first?
  1.    Cylinder with greater rotational energy at bottom than sphere
  2.    Both reach the bottom simultaneously with equal rotational energy at bottom
  3.    Sphere with greater rotational energy at bottom than cylinder
  4.    Sphere with lesser rotational energy at bottom than cylinder
 Discuss Question
Answer: Option D. -> Sphere with lesser rotational energy at bottom than cylinder
Question 1218. A light rope is loaded with many equal weights at equal horizontal intervals. The points of suspension on the rope lie on a
  1.    Ellipse
  2.    Cycloid
  3.    Catenary
  4.    Parabola
 Discuss Question
Answer: Option D. -> Parabola
Question 1219. The motion of a particle moving with S.H.M. from an extremity to the other, constitutes
  1.    None of these
  2.    Two oscillations
  3.    Half an oscillation
  4.    One full oscillation
 Discuss Question
Answer: Option C. -> Half an oscillation
Question 1220. A rigid body is in a stable equilibrium if the application of any force
  1.    Tends to lower the CG of the body
  2.    None of above
  3.    Neither raises nor lowers the CG of the body
  4.    Can raise the CG of the body but cannot lower it
 Discuss Question
Answer: Option D. -> Can raise the CG of the body but cannot lower it

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