KVPY 2019 SA Exam Previous Papers

Question : 70 of 80

Marks: +1, -0

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 clos eto:

one
two
three
four

Validate

Solution:

Pressure at the heart level = 100 mm of Hg = 13.3 kPa (given)

P_\foot = P_\heart + ρgh

= 13.3 + 10^3 × 10 × 1.3 = 26.3

kPa

P_\head = P_\heart -ρgh

= 9.3 kPa

P_\foot /P_\head =26.3/9.3≈ 3

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