Lakshya Education MCQs

Question: The potential energy of a vertically raised body is __________ the kinetic energy of a vertically falling body.
Options:
A. Equal to
B. Less than
C. Greater than
D. None of these
Answer: Option A

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Question 1. A block of mass m₁, placed on an inclined smooth plane is connected by a light string passing over a smooth pulley to mass m₂, which moves vertically downwards as shown in the below figure. the tension in the string is
  1.     m₁/m₂
  2.     m₁. g. sin α
  3.     m₁.m₂/m₁ + m₂
  4.     m₁. m₂.g (1 + sin α)/(m₁ + m₂)
Answer: Option D
Question 2. Center of gravity of a thin hollow cone lies on the axis at a height of
  1.     One-fourth of the total height above base
  2.     One-third of the total height above base
  3.     One-half of the total height above base
  4.     Three-eighth of the total height above the base
Answer: Option B
Question 3. A block of mass m₁, placed on an inclined smooth plane is connected by a light string passing over a smooth pulley to mass m₂, which moves vertically downwards as shown in the below figure. the tension in the string is
  1.     m₁/m₂
  2.     m₁. g. sin α
  3.     m₁.m₂/m₁ + m₂
  4.     m₁. m₂.g (1 + sin α)/(m₁ + m₂)
Answer: Option D
Question 4. The time of flight of a projectile on downward inclined plane depends upon
  1.     Angle of projection
  2.     Angle of inclination of the plane
  3.     Both (A) and (B)
  4.     None of these
Answer: Option C
Question 5. In a single threaded worm and worm wheel, the number of teeth on the worm is 50. the diameter of the effort wheel is 100 mm and that of load drum is 50 mm. the velocity ratio is
  1.     50
  2.     100
  3.     200
  4.     400
Answer: Option B
Question 6. The principle of transmissibility of forces states that, when a force acts upon a body, its effect is
  1.     Same at every point on its line of action
  2.     Different at different points on its line of action
  3.     Minimum, if it acts at the center of gravity of the body
  4.     Maximum, if it acts at the center of gravity of the body
Answer: Option C

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