26. The surface tension of mercury at normal temperature compared to that of water is
(a) more
(b) less
(c) same
(d) more or less depending on size of glass tube
(e) none of the above.
Ans: a
27. A perfect gas
(a) has constant viscosity
(b) has zero viscosity
(c) is incompressible
(d) is of theoretical interest
(e) none of the above.
Ans: e
28. For very great pressures, viscosity of moss gases and liquids
(a) remains same
(b) increases
(c) decreases
(d) shows erratic behaviour
(e) none of the above.
Ans: d
33. A fluid in equilibrium can’t sustain
(a) tensile stress
(b) compressive stress
(c) shear stress
(d) bending stress
(e) all of the above.
Ans: c
34. Viscosity of water in comparison to mercury is
(a) higher
(b) lower
(c) same
(d) higher/lower depending on temperature
(e) unpredictable.
Ans: a
35. The bulk modulus of elasticity with increase in pressure
(a) increases
(b) decreases
(c) remains constant
(d) increases first upto certain limit and then decreases
(e) unpredictable.
Ans: a
36. The bulk modulus of elasticity
(a) has the dimensions of 1/pressure
(b) increases with pressure
(c) is large when fluid is more compres¬sible
(d) is independent of pressure and viscosity
(e) is directly proportional to flow.
Ans: b
37. A balloon lifting in air follows the following principle
(a) law of gravitation
(b) Archimedes principle
(c) principle of buoyancy
(d) all of the above
(e) continuity equation.
Ans: d
38. The value of the coefficient of compressibility for water at ordinary pressure and temperature in kg/cm is equal to
(a) 1000
(b) 2100
(c) 2700
(d) 10,000
(e) 21,000
Ans: e
39. The increase of temperature results in
(a) increase in viscosity of gas
(b) increase in viscosity of liquid
(c) decrease in viscosity of gas
(d) decrease in viscosity of liquid
(e) (a) and (d) above.
Ans: d
40. Surface tension has the units of
(a) newtons/m
(b) newtons/m
(c) new tons/m
(d) newtons
(e) newton m
Ans: c
41. Surface tension
(a) acts in the plane of the interface normal to any line in the surface
(b) is also known as capillarity
(c) is a function of the curvature of the interface
(d) decreases with fall in temperature
(e) has no units.
Ans: a
42. The stress-strain relation of the newtoneon fluid is
(a) linear
(b) parabolic
(c) hyperbolic
(d) inverse type
(e) none of the above.
Ans: a
43. A liquid compressed in cylinder has a volume of 0.04 m3 at 50 kg/cm2 and a volume of 0.039 m3 at 150 kg/cm2. The bulk modulus of elasticity of liquid is
(a) 400 kg/cm2
(b) 4000 kg/cm2
(c) 40 x 105 kg/cm2
(d) 40 x 106 kg/cm2
(e) none of the above.
Ans: b
44. The units of viscosity are
(a) metres2 per sec
(b) kg sec/metre
(c) newton-sec per metre2
(d) newton-sec per metre
(e) none of the above.
Ans: b
45. Kinematic viscosity is dependent upon
(a) pressure
(b) distance
(c) level
(d) flow
(e) density.
Ans: e
46. Units of surface tension are
(a) energy/unit area
(b) distance
(c) both of the above
(d) it has no units
(e) none of the above.
Ans: c
47. Which of the following meters is not associated with viscosity
(a) Red wood
(b) Say bolt
(c) Engler
(d) Orsat
(e) none of the above
Ans: d
48. Choose the correct relationship
(a) specific gravity = gravity x density
(b) dynamicviscosity = kinematicviscosity x density
(c) gravity = specific gravity x density
(d) kinematicviscosity = dynamicviscosity x density
(e) hydrostaticforce = surface tension x gravity.
Ans: b
49. Dimensions of surface tension are
(a) MlL°T2
(b) MlL°Tx
(c) MlL r2
(d) MlL2T2
(e) MlL°t
Ans: a
50. For manometer, a better liquid combination is one having
(a) higher surface tension
(b) lower surface tension
(c) surface tension is no criterion
(d) high density and viscosity
(e) low density and viscosity
Ans: a