# Fluid mechanics objective

1. Fluid is substance that ?

1. Cannot be subjected to shear forces .
2. Always  expands until it fills any container
3. Has the same shear stress at a point regardless of its motion.
4. Cannot remain at rest under action of any shear forces.
Ans. Cannot remain at rest under action of any shear forces.

2. Fluid is substance which offers no resistance to change of .
(I)  Pressure    (II) Flow   (III) Shape    (IV) Volume  (V) Temperature
Ans. Shape

3. In a static fluid  ?
(I) resistance to shear stress is small
(II) Fluid pressure is zero
(III) Linear deformation is small
(IV) Only normal stresses can exist
(V) viscosity is nil
Ans. Only normal stresses can exist

4. Practical Fluids?
(I) are viscous
(II) possess surface tension
(III) arte compressible
(IV) possess all the above properties
(V) possess none of the above properties
Ans. possess all the above properties

5. A fluid is said to be ideal, if it is .
(I) incompressible
(II) inviscous
(III) viscous and incompressible
(IV) inviscous and compressible
(V) inviscous and incompressible
Ans. inviscous and incompressible

6. An ideal flow of any fluid must fulfill the following .
(I) Newton's law of motion
(II) Newton's law of viscosity
(III) Pascal law
(IV) Continuity equation
(V) Boundary layer theory
Ans. Continuity equation

7. If no resistance is encountered, such a substance is known as.
(I) Fluid    (II) water    (III) gas    (IV)  perfect solid     (V) ideal fluid
Ans. Ideal fluid

8. The volumetric change of the fluid caused by a resistance is known as.
(I) Volumetric strain   (II) Volumetric stress  (III) Compressibility
Ans. Compressibility

9. Density of water is maximum at.
(I)  0°C   (II) 0°K   (III) 4°C  (IV) 100°C   (V) 20°C
Ans. 4°C

10. Property of a fluid by which its own molecules are attracted is called .
(I) adhesion   (II) cohesion   (III) viscosity    (IV) compressibility
Ans. Cohesion

11. Mercury does not wet glass. This is due to property of liquid known as-
(I) adhesion    (II) cohesion  (III) surface tension  (IV) viscosity
Ans. Surface tension

12. The property of a fluid which enables it to resist tensile stress is known as-
(I) compressibility    (II) surface tension   (III) cohesion   (IV) adhesion    (V) viscosity
Ans. Cohesion

13. Property of a fluid by which molecules of different kinds of fluids are attracted to each other is called .
(I) adhesion   (II) cohesion   (III) viscosity  (IV) compressibility

14. When the flow parameters at any given instant remain same at every point, then flow is said to be.
(I) quasi static    (II) steady state   (III) laminar   (IV)  uniform
Ans. Uniform

15. Which of the following is dimensionless.
(I) specific weight   (II) specific volume   (III) specific gravity   (IV) specific speed
Ans. Specific gravity

16. The  normal stress in a fluid will be constant in all direction at a point only if.
(I) it is incompressible     (II) it has uniform viscosity    (III) it has zero viscosity
(IV) it is frictionless     (V) it is at rest
Ans. It is at rest

17. The pressure at a point in a fluid will not be same in all the direction when the fluid is .
(I) moving    (II) viscous    (III) viscous and static    (IV) inviscous and moving
(V)  viscous and moving
Ans. Viscous and moving

18. The tendency of a liquid surface to contract is due to the following property.
(I) cohesion    (II) adhesion  (III) viscosity   (IV)  surface tension   (V) elasticity
Ans. surface tension

19. The surface tension of mercury at normal temperature compared to that of water is.
(I) more   (II) less    (III) same  (IV) more or less depending on size of glass tube
Ans. More

20. The specific gravity of water is taken as.
(I) 0.001    (II) 0.01    (III)  0.1   (IV)  1
Ans. 1

21. The mas per unit volume of a liquid at a standard temperature and pressure is called.
(I) specific gravity    (II) mass density   (III0 specific gravity   (IV)  none of these
Ans. mass density

22. The unit of surface tension.
(I) N/m    (II) N/m²   (III) N-m
Ans. N/m

23. Falling drop of water become spheres due to the property of .
(I) surface tension of water     (II) compressibility of water
(III) capillarity of water          (IV)  viscosity of water
Ans. Surface tension of water

24. The pressure at a point 4m below the five surface of water is.
(I)  19.24kPa    (II) 29.24KPa   (III) 39.24KPa  (IV) 49.24KPa
Ans. 39.24KPa

25. Water is liquid.
(I) a compressible      (II)  an incompressible
Ans. an incompressible

26. The pressure measured with the help of a pressure gauge is called.
(I) atmospheric pressure         (II) gauge pressure
(III) absolute pressure             (IV) mean pressure
Ans. gauge pressure

27. The atmospheric pressure at sea level.
(I) 1.3 KN/m²       (II)  10.3 m of water
(III) 760 mm mercury    (IV)  all of these
Ans. all of these

28.  The pressure is less than atmospheric pressure is known as.
(I) suction pressure      (II) vacuum pressure
(III) negative gauge pressure  (IV) all of these
Ans. All of these

29. The pressure of liquid measured with the help of a piezometer tube is.
(I) vacuum pressure       (II) gauge pressure
(III) absolute pressure    (IV) atmospheric pressure
Ans. gauge pressure

30. The pressure measured with the help of a piezometer tube is in.
(I)  N/mm²   (II) N/m    (III) head of liquid   (IV)  all of these

31. The mass per unit volume of a liquid at a standard temperature and pressure is called.
(I) specific weight  (II) mass density  (III) specific gravity
(IV) none of these
Ans.  mass density

32. The weight per unit volume of a liquid at a standard temperature and pressure is called.
(I)  specific weight  (II) mass density  (III) specific gravity
(IV) none of these
Ans. specific weight

33. The ratio of specific weight of a liquid to the specific weight of pure water at a standard temperature is called.
(I) density of liquid    (II) specific gravity of liquid
(III) compressibility of liquid   (IV) surface tension of liquid
Ans. specific gravity of liquid

34. The specific gravity of water is taken as.
(I) 0.001   (II) 0.01   (III) 0.1  (IV) 1
Ans. 1

35. The forces per unit length is the unit of .
(I) surface tension   (II) compressibility    (III) capillarity
(IV)  viscosity
Ans.  surface tension

36. The variation is the volume of a liquid with the variation of pressure is called its.
(I) surface tension   (II)  compressibility    (III) capillarity
(IV) viscosity
Ans . compressibility

37. The  unit of surface tension.
(I) N/m     (II)  N/m²  (III) N/m³     (IV) N-m
Ans. N/m³

38. Falling drop of water becomes spheres due to the  property of./
(I) surface tension of water   (II) compressibility of water
(III)  capillarity of water   (IV) viscosity of water
Ans. surface tension of water

39.  water is ----------- liquid
(I)  compressible    (II) incompressible
Ans. incompressible

40.  The pressure measured with the help of a pressure gauge is called.
(I)  atmospheric pressure   (II)  gauge pressure
(III) absolute pressure        (IV)  mean pressure
Ans. gauge pressure

41.  The atmospheric pressure at sea level is
(I)  103KN/m²   (II)  10.3 m of water   (III) 760mm of mercury
(IV) all of these
Ans. all of these

42. When the pressure intensity at a point is more than the local atmospheric pressure then the difference of these two pressure is called.
(I)  gauge pressure      (II) absolute pressure
(III) positive gauge pressure  (IV) vacuum pressure
Ans. positive gauge pressure

43. The pressure less then atmospheric pressure is known as.
(I) suction pressure     (II) vacuum pressure
(III) negative gauge pressure   (IV) all of these
Ans. all of these

44.  The absolute pressure is equal to.
(I) gauge pressure + atmospheric pressure
(II) gauge pressure - atmospheric pressure \
(III) atmospheric pressure - gauge pressure
(IV)  gauge pressure - vacuum pressure
Ans. gauge pressure + atmospheric pressure