1. Fluid is a substance that
(a) cannot be subjected to shear forces
(b) always expands until it fills any con-tainer
(c) has the same shear stress.at a point regardless of its motion
(d) cannot remain at rest under action of any shear force
(e) flows.
Ans: d
2. Fluid is a substance which offers no resistance to change of
(a) pressure
(b) flow
(c) shape
(d) volume
(e) temperature.
Ans: c
3. Practical fluids
(a) are viscous
(b) possess surface tension
(c) are compressible
(d) possess all the above properties
(e) possess none of the above properties.
Ans: d
4. In a static fluid
(a) resistance to shear stress is small
(b) fluid pressure is zero
(c) linear deformation is small
(d) only normal stresses can exist
(e) viscosity is nil.
Ans: d
5. A fluid is said to be ideal, if it is
(a) incompressible
(b) inviscous
(c) viscous and incompressible
(d) inviscous and compressible
(e) inviscous and incompressible.
Ans: e
6. An ideal flow of any fluid must fulfill the following
(a) Newton’s law of motion
(b) Newton’s law of viscosity
(c) Pascal’ law
(d) Continuity equation
(e) Boundary layer theory.
Ans: d
7. If no resistance is encountered by displacement, such a substance is known as
(a) fluid
(b) water
(c) gas
(d) perfect solid
(e) ideal fluid.
Ans: e
8. The volumetric change of the fluid caused by a resistance is known as
(a) volumetric strain
(b) volumetric index
(c) compressibility
(d) adhesion
(e) cohesion.
Ans: c
9. Liquids
(a) cannot be compressed
(b) occupy definite volume
(c) are not affected by change in pressure and temperature
(GO are not viscous
(e) none of the above.
Ans: e
10. Density of water is maximum at
(a) 0°C
(b) 0°K
(c) 4°C
(d) 100°C
(e) 20°C
Ans: c
12. The value of mass density in kgsecVm4 for water at 0°C is
(a) 1
(b) 1000
(c) 100
(d) 101.9
(e) 98.1
Ans: d
14. Property of a fluid by which its own molecules are attracted is called
(a) adhesion
(b) cohesion
(c) viscosity
(d) compressibility
(e) surface tension.
Ans: b
15. Mercury does not wet glass. This is due to property of liquid known as
(a) adhesion
(b) cohesion
(c) surface tension
(d) viscosity
(e) compressibility.
Ans: c
16. The property of a fluid which enables it to resist tensile stress is known as
(a) compressibility
(b) surface tension
(c) cohesion
(d) adhesion
(e) viscosity.
Ans: c
17. Property of a fluid by which molecules of different kinds of fluids are attracted to each other is called
(a) adhesion
(b) cohesion
(c) viscosity
(d) compressibility
(e) surface tension.
Ans: a
18. The specific weight of water is 1000 kg/m
(a) at norma] pressure of 760 mm
(b) at 4°C temperature
(c) at mean sea level
(d) all the above
(e) none of the above.
Ans: d
19. Specific weight of water in S.I. units is equal to
(a) 1000 N/m3
(b) 10000 N/m3
(c) 9.81 xlO3 N/m3
(d) 9.81 xlO6N/m3
(e) 9.81 N/m3.
Ans: c
20. When the flow parameters at any given instant remain same at every point, then flow is said to be
(a) quasi static
(b) steady state
(c) laminar
(d) uniform
(e) static.
Ans: d
21. Which of the following is demensionless
(a) specific weight
(b) specific volume
(c) specific speed
(d) specific gravity
(e) specific viscosity.
Ans: d
22. The normal stress in a fluid will be constant in all directions at a point only if
(a) it is incompressible
(b) it has uniform viscosity
(c) it has zero viscosity
(d) it is frictionless
(e) it is at rest.
Ans: e
23. The pressure at a point in a fluid will not be same in all the directions when the fluid is
(a) moving
(b) viscous
(c) viscous and static
(d) inviscous and moving
(e) viscous and moving.
Ans: e
24. An object having 10 kg mass weighs 9.81kg on a spring balance. The value of ‘g’ at this place is
(a) 10m/sec2
(b) 9.81 m/sec2
(c) 10.2/m sec
(d) 9.75 m/sec2
(e) 9 m/sec .
Ans: a
25. The tendency of a liquid surface to contract is due to the following property
(a) cohesion
(b) adhesion
(c) viscosity
(d) surface tension
(e) elasticity.
Ans: d