In chain surveying, the primary condition for selecting a framework of triangles is that each triangle should preferably be

equilateral or nearly equilateral

In the two-peg test for a level, the purpose of keeping the instrument midway between the pegs in the first setup is to

eliminate collimation error from the difference in readings

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₹189See the full kit

Explore all 8 pagesKit cover

Open your kit

Explore all 8 pages · Page 1 is free

710 GATE GA questions of 2017–2026, ranked

8 high-yield rules
14 grammar rules GATE tested
16 algebra formulas with solved PYQs
130+ past questions solved in a line
16% since 2021: spatial reasoning
Timed 15-mark test with worked key
And dozens more of the most-asked concepts from recent papers

Only 8 pages · Page 1 free

113 days left · GATE 2027 · first day

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Hydraulics / Seepage · 5 formulae in the cheatsheet

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Manning’s velocity uses hydraulic radius R = A/P (area ÷ wetted perimeter), not the flow depth.

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