Engineering
What the Engineering domain tests
The Engineering domain of NUST NET samples pre-engineering mathematics, physics, and chemistry, with emphasis on applying formulas to unfamiliar numerical situations. Questions often combine a short calculation with graph reading, unit checking, or a conceptual check.
Core rules and concepts
- Use SI units and dimensional analysis before calculating; a dimensionally impossible answer is wrong even if the number looks familiar.
- In mechanics, separate x and y motion, choose a positive direction, and draw free-body diagrams. Newton’s second law is ΣF = ma, not “motion implies force.”
- In electricity, distinguish series and parallel rules: current is common in series, voltage is common in parallel.
- In mathematics, check domain restrictions, radians versus degrees, and whether a calculator answer is exact or rounded.
Worked example
A car moving at 20 m/s brakes uniformly to rest in 4 s. Find the distance travelled. Reasoning: acceleration a = (0 − 20)/4 = −5 m/s². Using s = ut + ½at² gives s = 20(4) + ½(−5)(16) = 80 − 40 = 40 m. The average-velocity form s = ((20 + 0)/2)(4) = 40 m confirms it. A negative distance would signal a sign error.
Traps that cost marks
Using diameter as radius, mixing grams with kilograms, rounding intermediate values too early, treating action–reaction pairs as cancelling on the same body, and ignoring that “uniformly” means constant acceleration. In graphs, read the axis labels and units before choosing a gradient or area.