Fluid Mechanics Practice Tests - Set 08 - ObjectiveBooks
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Practice Test: Question Set - 08

1. Free surface of a liquid behaves like a sheet and tends to contract to smallest possible area due to the
(A) Force of adhesion
(B) Force of cohesion
(C) Force of friction
(D) Force of diffusion

2. Which of the following statement is correct?
(A) In a compressible flow, the volume of the flowing liquid changes during the flow
(B) A flow, in which the volume of the flowing liquid does not change, is called incompressible flow
(C) When the particles rotate about their own axes while flowing, the flow is said to be rotational flow
(D) All of the above

3. A bucket of water is hanging from a spring balance. An iron piece is suspended into water without touching sides of bucket from another support. The spring balance reading will
(A) Increase
(B) Decrease
(C) Remain same
(D) Increase/decrease depending on depth of immersion

4. A flow through a long pipe at constant rate is called
(A) Steady uniform flow
(B) Steady non-uniform flow
(C) Unsteady uniform flow
(D) Unsteady non-uniform flow

5. Choose the wrong statement
(A) Viscosity of a fluid is that property which determines the amount of its resistance to a shearing force
(B) Viscosity is due primarily to interaction between fluid molecules
(C) Viscosity of liquids decreases with increase in temperature
(D) Viscosity of liquids is appreciably affected by change in pressure

6. The unit of dynamic viscosity in S.I. units is
(A) N-m/s2
(B) N-s/m2
(C) Poise
(D) Stoke

7. A perfect gas
(A) Has constant viscosity
(B) Has zero viscosity
(C) Is in compressible
(D) None of the above

8. In a free nappe,
(A) The pressure below the nappe is atmospheric
(B) The pressure below the nappe is negative
(C) The pressure above the nappe is atmospheric
(D) The pressure above the nappe is negative

9. 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

10. One liter of water occupies a volume of
(A) 100 cm3
(B) 250 cm3
(C) 500 cm3
(D) 1000 cm3

11. 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

12. The maximum discharge over a broad crested weir is
(A) 0.384 Cd × L × H1/2
(B) 0.384 Cd × L × H3/2
(C) 1.71 Cd × L × H1/2
(D) 1.71 Cd × L × H3/2

13. The ratio of absolute viscosity to mass density is known as
(A) Specific viscosity
(B) Viscosity index
(C) Kinematic viscosity
(D) Coefficient of viscosity

14. Reynold's number is the ratio of inertia force to
(A) Pressure force
(B) Elastic force
(C) Gravity force
(D) Viscous force

15. Meta-centric height is given as the distance between
(A) The center of gravity of the body and the metacenter
(B) The center of gravity of the body and the center of buoyancy
(C) The center of gravity of the body and the center of pressure
(D) Center of buoyancy and metacenter

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