Viscosity & Hydraulics is one of 9 topics in the Grade 12 Technical Sciences CAPS syllabus, covered across 3 lessons on Study Vault. Below are real practice questions from this topic with full worked answers.
Sample practice questions
Easy
1. What does viscosity measure?
A fluid's internal resistance to flow
A fluid's temperature
A fluid's total volume
A fluid's colour
Answer: A fluid's internal resistance to flow — Viscosity measures a fluid's internal resistance to flow -- how "thick" or "syrupy" it behaves as it moves.
Easy
2. Which formula gives the pressure at a depth h within a static fluid due to the fluid's own weight?
p = rho g h
p = F/A only
p = mgh
p = ma
Answer: p = rho g h — The pressure at depth h in a static fluid is p = rho g h, where rho is the fluid density and g is gravitational acceleration.
Medium
3. Calculate the pressure at a depth of 4 m in a hydraulic reservoir containing fluid of density 850 kg.m^-3 (g = 9,8 m.s^-2), in Pa.
Answer: 33320 — p = rho g h = 850 x 9,8 x 4 = 33 320 Pa.
