NUST NET Physics — Fluid Dynamics
Fluid Dynamics is part of the FSc Physics course that NUST NET-Engineering draws on (Physics is 60 of the 200 MCQs). It breaks into 2 subtopics, and we hold 50 NET-pattern practice MCQs on it, each with a written explanation. Tap a subtopic below to practise just that.
Subtopics (2)
How Fluid Dynamics is tested
Across the 8 NET-pattern papers on ParhaiKrlo, Fluid Dynamics accounts for 18 questions. It appears in all 8, about 2.3 questions a paper. The heaviest was NUST NET Past Paper 04, with 3 questions, and the most recent is NUST NET Past Paper 07, with 2.
| Paper | Questions |
|---|---|
| NUST NET Past Paper 07 | 2 |
| NUST NET Past Paper 08 | 2 |
| NUST NET Past Paper 05 | 2 |
| NUST NET Past Paper 06 | 2 |
| NUST NET Past Paper 03 | 2 |
| NUST NET Past Paper 04 | 3 |
| NUST NET Past Paper 01 | 3 |
| NUST NET Past Paper 02 | 2 |
Fluid Dynamics MCQs from the NET-pattern papers
Try each one before opening the answer. Each comes with a short explanation.
- Q1 · NUST NET Past Paper 07 · Fluid Dynamics
A small sphere falls through a viscous liquid. If its radius is doubled, its terminal velocity becomes:
- A.4 times
- B.2 times
- C.8 times
- D.half
Show answer
Answer: A. 4 times — Terminal velocity v = 2r²(ρ − σ)g/(9η) ∝ r², so doubling r gives 4v.
- Q2 · NUST NET Past Paper 08 · Fluid Dynamics
Water flows at 3 m/s through a pipe of cross-sectional area 2 × 10⁻³ m². The volume of water delivered per second is:
- A.0.6 L/s
- B.60 L/s
- C.1.5 L/s
- D.6 L/s
Show answer
Answer: D. 6 L/s — Q = Av = 2 × 10⁻³ × 3 = 6 × 10⁻³ m³/s = 6 L/s.
- Q3 · NUST NET Past Paper 05 · Fluid Dynamics
Water flows at 1 m/s through a pipe of diameter 4 cm, which narrows to a diameter of 2 cm. The speed in the narrow part is:
- A.4 m/s
- B.2 m/s
- C.8 m/s
- D.0.25 m/s
Show answer
Answer: A. 4 m/s — A₁v₁ = A₂v₂ and A ∝ d²: halving d quarters A, so v = 4 m/s.