KVPY2019PhysicsMechanical Properties of Fluids
A healthy adult of height 1 . 7   m has an average blood pressure (BP) of 100   mm of Hg . The heart is typically at a height of 1 . 3   m from the foot. Take, the density of blood to be 10 3   kg / m 3 and note that 100   mm of Hg is equivalent to 13 . 3 kPa (kilo pascals). The ratio of BP in the foot region to that in the head region is close to
Options
- Aone
- Btwo
- Cthree
- Dfour
Correct answer
C. three
Step-by-step solution
Pressure at head level = p heart - ρ g h = 13 . 3 - 10 3 × 10 × 0 . 4 = 9 . 3 kPa Pressure at foot level = p heat + ρ g h = 13 . 3 + 10 3 × 10 × 1 . 3 = 26 . 3 kPa So, ratio = 26 . 3 9 . 3 ≈ 2 . 9 or 3