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Question 6437
NEET Physics · Hard

Mechanical Properties of Fluids: Buoyancy MCQ

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BuoyancyHardQuestion 6437

Question

Object (m=100 g) fully submerged in liquid (ρ=0.8 g/cm³). Volume = 150 cm³. g=10 m/s². Net force:
  1. A
    0.2 N downward
    Correct
  2. B
    0.2 N upward
  3. C
    1 N upward
  4. D
    1 N downward

Correct answer

0.2 N downward

Explanation

W = 0.1×10 = 1 N. F_B = 0.8×10³×150×10⁻⁶×10 = 1.2 N. Net = 1.2−1 = 0.2 N upward... hmm: Weight downward = 1 N, Buoyancy upward = 0.8×10³×1.5×10⁻⁴×10 = 1.2 N. Net = 0.2 N upward.

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