Hydraulics and Fluid Mechanics problems
- 1. The liquid used in manometers should have
Options- A. low density
- B. high density
- C. low surface tension
- D. high surface tension Discuss
Correct Answer: high surface tension
- 2. The hydraulic gradient line lies over the centre line of the pipe by an amount equal to the
Options- A. pressure head
- B. velocity head
- C. pressure head + velocity head
- D. pressure head - velocity head Discuss
Correct Answer: pressure head
- 3. The viscosity of a liquid __________ its rate of flow through a hole in a vessel.
Options- A. effects
- B. does not effect Discuss
Correct Answer: effects
- 4. When the pressure intensity at a point is more than the local atmospheric pressure, then the difference of these two pressures is called
Options- A. gauge pressure
- B. absolute pressure
- C. positive gauge pressure
- D. vacuum pressure Discuss
Correct Answer: positive gauge pressure
- 5. When a body is placed over a liquid, it will float if
Options- A. gravitational force is equal to the upthrust of the liquid
- B. gravitational force is less than the upthrust of the liquid
- C. gravitational force is more than the upthrust of the liquid
- D. none of the above Discuss
Correct Answer: gravitational force is equal to the upthrust of the liquid
- 6. The formula for discharge over a sharp-crested weir and Ogee weir is same as that of a rectangular weir
Options- A. Agree
- B. Disagree Discuss
Correct Answer: Agree
- 7. The tangential velocity of the water element having a free vortex is
Options- A. directly proportional to its distance from the centre
- B. inversely proportional to its distance from the centre
- C. directly proportional to its (distance)2 from the centre
- D. inversely proportional to its (distance)2 from the centre Discuss
Correct Answer: inversely proportional to its distance from the centre
- 8. The hydraulic mean depth for a circular pipe of diameter (d) is
Options- A. d/6
- B. d/4
- C. d/2
- D. d Discuss
Correct Answer: d/4
- 9. When the Mach number is less than unity, the flow is called
Options- A. sub-sonic flow
- B. sonic flow
- C. super-sonic flow
- D. hyper-sonic flow Discuss
Correct Answer: sub-sonic flow
- 10. A uniform body 3 m long, 2 m wide and 1 m deep floats in water. If the depth of immersion is 0.6 m, then the weight of the body is
Options- A. 3.53 kN
- B. 33.3 kN
- C. 35.3 kN
- D. none of these Discuss
Correct Answer: 35.3 kN
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