A. 1358mm
B. 957mm
C. 760mm
D. 638mm
Correct Answer: Option D
D. 638mm
Explanation
Let hQ and ρQ be the least length and the density of Q1
while h and ρ are the length and density of mercury respectively.
h×ρ×g=hQ×ρQ×g
76cm×13.6×10=hQ×16.2×10
hQ=76×13.6×10/16.2×10
hQ=10336/162
hQ≊63.8cm=638mm
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