SSC JE Exam - dynamics of ideal fluids bernoulli equation total head velocity head pressure head applications Online Test (MCQ Quiz)

1. What fundamental principle governs the conservation of energy for an incompressible, inviscid fluid in steady flow?

A) Newton's Second Law B) Bernoulli's Equation C) Archimedes' Principle D) Pascal's Law

2. In Bernoulli's equation, which term represents the energy per unit volume due to the fluid's motion?

A) Pressure head (P/ρg) B) Elevation head (z) C) Velocity head (v²/2g) D) Total head (H)

3. The term 'P/ρg' in Bernoulli's equation represents the:

A) Kinetic energy per unit volume B) Potential energy per unit volume C) Pressure energy per unit volume, expressed as a head D) Total mechanical energy per unit volume

4. What does the 'z' term in Bernoulli's equation represent?

A) Pressure energy per unit volume B) Velocity energy per unit volume C) Potential energy per unit volume, expressed as a head D) Flow energy per unit volume

5. Bernoulli's equation is derived assuming the fluid is:

A) Viscous and compressible B) Incompressible and inviscid C) Compressible and inviscid D) Viscous and incompressible

6. Steady flow in the context of Bernoulli's equation means that:

A) The velocity of every fluid particle is zero B) The velocity at any point in the fluid remains constant over time C) The fluid is not moving D) The pressure at every point is atmospheric

7. The total head (H) in Bernoulli's equation is the sum of:

A) Pressure head and velocity head B) Pressure head and elevation head C) Velocity head and elevation head D) Pressure head, velocity head, and elevation head

8. If the velocity of an ideal fluid increases in a horizontal pipe, what happens to its pressure, assuming no energy loss?

A) Pressure increases B) Pressure decreases C) Pressure remains constant D) Pressure becomes zero

9. What is a primary application of Bernoulli's equation in engineering?

A) Calculating the viscosity of fluids B) Determining the flow rate in pipes and channels C) Analyzing heat transfer in boiling D) Predicting turbulence in fluid flow

10. In a Venturi meter, Bernoulli's equation is used to relate the pressure difference to:

A) The temperature of the fluid B) The viscosity of the fluid C) The velocity of the fluid D) The density of the fluid

11. The lift force on an airplane wing is primarily explained by:

A) Newton's Third Law B) Bernoulli's Principle C) The Magnus Effect D) Viscous drag theory

12. Which device uses Bernoulli's principle to measure the velocity of a fluid?

A) Manometer B) Orifice meter C) Pitot tube D) Weir

13. For a fluid flowing vertically upwards in a pipe, if the velocity increases, the pressure will:

A) Increase by a greater amount than if the pipe were horizontal B) Decrease by a greater amount than if the pipe were horizontal C) Remain unchanged D) Increase due to gravity

14. What is the formula for Bernoulli's equation for an ideal fluid in steady flow?

A) P + ρv² + ρgz = constant B) P/ρg + v²/2g + z = constant C) P/ρ + v²/2 + gz = constant D) P + v²/2g + z = constant

15. The 'pressure head' in Bernoulli's equation has units of:

A) Pressure (e.g., Pascals) B) Energy per unit volume (e.g., J/m³) C) Length (e.g., meters) D) Velocity (e.g., m/s)

16. Which of the following is NOT an assumption for the derivation of Bernoulli's equation?

A) Steady flow B) Incompressible fluid C) Presence of viscosity D) No external work done on or by the fluid

17. A stagnation point in fluid flow is a point where the:

A) Velocity is maximum B) Pressure is minimum C) Velocity is zero D) Density is zero

18. In the context of a Pitot tube, the difference between the stagnation pressure and the static pressure is equal to:

A) The pressure head B) The elevation head C) The velocity head D) The total head

19. What is the 'total head' in Bernoulli's equation also referred to as?

A) Dynamic pressure B) Static pressure C) Energy line D) Mechanical energy per unit weight of fluid

20. The flow of water from a faucet is an example where Bernoulli's principle can be observed because:

A) As the water falls, its velocity increases, and its cross-sectional area decreases B) As the water falls, its velocity decreases, and its cross-sectional area increases C) The pressure remains constant throughout the fall D) Viscosity significantly affects the flow

21. Consider a horizontal pipe where the cross-sectional area decreases. According to Bernoulli's equation, the velocity of the fluid will:

A) Decrease B) Increase C) Remain constant D) Become zero

22. If the velocity of an ideal fluid decreases in a horizontal pipe, its pressure will:

A) Decrease B) Increase C) Remain the same D) Fluctuate randomly

23. The equation P/ρg + v²/2g + z = constant is valid for:

A) Any fluid flow B) Viscous, turbulent flow C) Incompressible, inviscid, steady flow D) Compressible, steady flow

24. What does the term 'v²/2g' in Bernoulli's equation represent physically?

A) Pressure energy per unit weight B) Potential energy per unit weight C) Kinetic energy per unit weight D) Total energy per unit weight

25. In a siphon, the flow of liquid is primarily driven by:

A) The velocity of the liquid B) The pressure difference created by elevation changes C) The viscosity of the liquid D) External pumping

26. The application of Bernoulli's equation to a Venturi meter allows for the calculation of:

A) Fluid temperature B) Fluid viscosity C) Flow rate D) Fluid density

27. A limiting factor for the direct application of Bernoulli's equation is:

A) The fluid being too dense B) The flow being unsteady C) The presence of significant friction losses D) High temperatures

28. In the equation P + ρv²/2 + ρgz = constant, the term ρv²/2 represents:

A) Pressure energy per unit volume B) Kinetic energy per unit volume C) Potential energy per unit volume D) Total energy per unit volume

29. What is the 'static head' in fluid dynamics?

A) The velocity head B) The pressure head C) The elevation head D) The sum of pressure and velocity heads

30. The 'dynamic head' in fluid dynamics is equivalent to the:

A) Pressure head B) Elevation head C) Velocity head D) Total head

31. When applying Bernoulli's equation between two points in a fluid flow, if point 1 is at a higher elevation than point 2, and velocity is constant, then:

A) Pressure at point 1 must be higher than at point 2 B) Pressure at point 2 must be higher than at point 1 C) Pressure at both points must be equal D) Pressure at point 1 must be lower than at point 2

32. The phenomenon of a ball curving in flight (Magnus effect) is related to Bernoulli's principle due to:

A) The ball's spin creating different air velocities on its sides B) The ball's density C) The ball's weight D) Air resistance alone

33. In a horizontal Venturi meter, the pressure is lowest at the section with the:

A) Largest cross-sectional area B) Smallest cross-sectional area C) Highest velocity D) Lowest velocity

34. Which of the following is a consequence of Bernoulli's principle?

A) A fluid at higher pressure flows faster B) A fluid at lower pressure flows faster C) A fluid with higher viscosity flows faster D) A fluid with lower density flows slower

35. The total energy line (TEL) for a fluid flow accounts for:

A) Pressure head only B) Velocity head only C) Elevation head only D) Pressure head, velocity head, and elevation head

36. The energy grade line (EGL) is another term for the:

A) Static pressure line B) Velocity head line C) Total head line D) Friction loss line

37. For flow in an open channel, Bernoulli's equation can be applied if:

A) The flow is turbulent B) The surface is exposed to atmosphere and pressure is atmospheric C) Viscosity is very high D) The channel is circular

38. A Pitot-static tube measures:

A) Static pressure only B) Stagnation pressure only C) Velocity of flow D) Flow rate directly

39. If a fluid is flowing in a pipe that widens, and the flow is steady and ideal, the pressure will:

A) Increase B) Decrease C) Remain constant D) Become zero

40. The derivation of Bernoulli's equation relies on the control volume analysis of:

A) A single fluid particle B) A streamtube C) The entire flow field D) The boundary layer

41. What is the fundamental reason for the lift on an aircraft wing?

A) The wing pushes air downwards (Newton's 3rd Law) B) The air flowing over the curved upper surface travels a longer distance and thus faster, resulting in lower pressure above the wing (Bernoulli's Principle) C) The wing's weight is less than the air density D) The wing's shape causes air to stagnate above it

42. In steady flow, the velocity at a point can change with:

A) Time B) Position only C) Pressure only D) Temperature only

43. The term 'ρv²/2' in Bernoulli's equation is known as the:

A) Static pressure B) Stagnation pressure C) Dynamic pressure D) Hydrostatic pressure

44. If a fluid flows from a region of high pressure to a region of low pressure, its velocity will:

A) Decrease B) Increase C) Remain constant D) Become unpredictable

45. Bernoulli's equation is essentially a statement of conservation of:

A) Mass B) Momentum C) Energy D) Angular momentum

46. A horizontal pipe has a section where its diameter abruptly increases. If an ideal fluid flows through it, the pressure in the wider section will be:

A) Higher than in the narrower section B) Lower than in the narrower section C) Equal to the pressure in the narrower section D) Zero

47. Which of the following is a valid application of Bernoulli's equation?

A) Designing a pump impeller B) Analyzing water hammer in pipes C) Calculating the discharge through a small orifice under a head D) Determining the friction factor in pipe flow

48. The equation P/ρg + v²/2g + z = constant is also known as the:

A) Continuity Equation B) Momentum Equation C) Energy Equation per unit weight D) Navier-Stokes Equation

49. In a vertical pipe flowing upwards, if the velocity increases, and density and gravity are constant, the pressure will:

A) Increase significantly B) Decrease significantly C) Remain the same D) Fluctuate

50. The primary limitation of Bernoulli's equation in real-world applications is the neglect of:

A) Gravity B) Pressure forces C) Viscous effects and turbulence D) Flow velocity

dynamics of ideal fluids bernoulli equation total head velocity head pressure head applications - Online Test

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