##### Q41. An ideal fluid is defined as the fluid which

(a) is compressible
(b) is incompressible
(c) is incompressible and non-viscous (inviscid)
(d) has negligible surface tension.

Ans: (c) is incompressible and non-viscous (inviscid)

##### Q42. Newton’s law of viscosity states that

(a) shear stress is directly proportional to the velocity
(b) shear stress is directly proportional to velocity gradient
(c) shear stress is directly proportional to shear strain
(d) shear stress is directly proportional to the viscosity.

Ans:  (b) shear stress is directly proportional to velocity gradient

##### Q43. A Newtonian fluid is defined as the fluid which

(a) is incompressible and non-viscous
(b) obeys Newton’s law of viscosity
(c) is highly viscous
(d) is compressible and non-viscous.

Ans:  (b) obeys Newton’s law of viscosity

##### Q44. Surface tension has the units of

(a) force per unit area
(b) force per unit length
(c) force per unit volume
(d) none of the above.

Ans: (b) force per unit length

##### Q45. The gases are considered incompressible when Mach number is

(a) equal to 1.0
(b) equal to 0.50
(c) more than 0.3
(d) less than 0.2.

Ans:  (d) less than 0.2.

##### Q46. Kinematic viscosity (ν) is equal to

(a) μ × ρ
(b)μ/ρ
(c) ρ/μ
(d) none of the above.

Ans:  (b)μ/ρ

##### Q47. Hydrostatic law of pressure is given as

(a) ∂p/∂z= ρg
(b) ∂p/∂z= 0
(c)∂p/∂z= z
(d) ∂p/∂z= constant.

Ans:  (a) ∂p/∂z= ρg

##### Q48. The relation between surface tension (σ) and difference of pressure (Δp) between the inside and outside of a liquid droplet is given as

(a) Δp = σ/4d
(b) Δp = σ/2d
(c) Δp = 4σ/d
(d) Δp = σ/d

Ans:  (d) Δp = σ/d

##### Q49. For a soap bubble, the surface tension (σ) and difference of pressure (Δp) are related as

(a) Δp = σ/4d
(b) Δp = σ/2d
(c) Δp = 4σ/d
(d) Δp = 8σ/d

Ans:   (d) Δp = 8σ/d

##### Q50. For a liquid jet, the surface tension (σ) and difference of pressure (Δp) are related as

(a) Δp = σ/4d
(b) Δp = σ/2d
(c) Δp = 4σ/d
(d) Δp = 2σ/d

Ans:  (d) Δp = 2σ/d

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Hydraulics and Fluid mechanics MCQ-Section-1

Hydraulics and Fluid mechanics MCQ-Section-2

Hydraulics and Fluid mechanics MCQ-Section-3

Hydraulics and Fluid mechanics MCQ-Section-4

Hydraulics and Fluid mechanics MCQ-Section-5

Hydraulics and Fluid mechanics MCQ-Section-6