Common JEE Traps

Same dimensions does NOT mean same physical quantity (work ≠ torque)
Dimensional correctness does NOT guarantee physical correctness
The argument of log, exp, sin must be dimensionless
Leading zeros are NEVER significant (0.0034 = 2 SF)
Subtracting nearly equal quantities amplifies relative error enormously
The variable with the HIGHEST power contributes the most error
Positive zero error: subtract from reading; negative: add
Constants (pi, 2, G) do not contribute to measurement error
The approximation g(1-2h/R) has nothing to do with this chapter — but dimensional analysis can check it
"Percentage error adds" is WRONG for sums — only for products/powers