SSC JE Civil Engineering 29-Oct-2020 Shift 1 Paper

Question : 140 of 200

Marks: +1, -0

A planimeter measures the area of figure, traversed clockwise with anchor point inside and tracking with

\M = 100 \cm^2

, additive constant C = 20, initial reading 3.436, final reading 8.945. The zero mark of the dial passed the index once in the reverse direction. The area measured was:

$1914.7 \cm^2$
$1760.8 \cm^2$
$1550.9\cm^2$
$1108.16 \cm^2$

Validate

Solution:

M=100 {\cm}^{2}

C=20

F=8.945

I=3.436

N=1

\Δ=M(F-I ±10 N+C)

(- ve sign taken because reverse direction given)

\Δ=100 × (8.945-3.436-10+20)

=1550.9 {\cm}^{2}

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