Mechanical Engineering Fluid Mechanics Test - Set 20 - ObjectiveBooks
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# Practice Test: Question Set - 20

1. The pressure intensity in kN/m2 (or kPa) at any point in a liquid is (where w = Specific weight of liquid, and h = Depth of liquid from the surface)
(A) w
(B) wh
(C) w/h
(D) h/w

2. The resultant upward pressure of a fluid on a floating body is equal to the weight of the fluid displaced by the body. This definition is according to
(A) Buoyancy
(B) Equilibrium of a floating body
(C) Archimedes' principle
(D) Bernoulli's theorem

3. The liquid used in manometers should have
(A) Low density
(B) High density
(C) Low surface tension
(D) High surface tension

4. Which of the following instrument can be used for measuring speed of an aeroplane?
(A) Venturimeter
(B) Orifice plate
(C) Pitot tube
(D) Rotameter

5. A jet of water discharging from a 40 mm diameter orifice has a diameter of 32 mm at its vena contracta. The coefficient of contraction is
(A) 0.46
(B) 0.64
(C) 0.78
(D) 0.87

6. Buoyant force is
(A) Resultant force acting on a floating body
(B) Equal to the volume of liquid displaced
(C) Force necessary to keep a body in equilibrium
(D) The resultant force on a body due to the fluid surrounding it

7. In case of flow through parallel pipes,
(A) The head loss for all the pipes is same
(B) The total discharge is equal to the sum of discharges in the various pipes
(C) The total head loss is the sum of head losses in the various pipes
(D) Both (A) and (B)

8. Rotameter is a device used to measure
(A) Absolute pressure
(B) Velocity of fluid
(C) Flow
(D) Rotation

9. In a broad-crested weir, the discharge is maximum if the head of water on the downstream side of weir is __________ the head of water on the upstream side of weir.
(A) Equal to
(B) One-third
(C) Two-third
(D) Three-fourth

10. When a body, floating in a liquid, is given a small angular displacement, it starts oscillating about a point known as
(A) Centre of pressure
(B) Centre of gravity
(C) Centre of buoyancy
(D) Metacentre

11. A nozzle is generally made of
(A) Cylindrical shape
(B) Convergent shape
(C) Divergent shape
(D) Convergent-divergent shape

12. Pitot tube is used for measurement of
(A) Pressure
(B) Flow
(C) Velocity
(D) Discharge

13. Coefficient of discharge Cd is equal to (where Cc = Coefficient of contraction, Cv = Coefficient of velocity, and Cr = Coefficient of resistance)
(A) Cc × Cv
(B) Cc × Cr
(C) Cv × Cr
(D) Cc/Cr

14. The value of mass density in kg-sec-V-m⁴ for water at 0°C is
(A) 1
(B) 1000
(C) 100.9
(D) 101.9

15. The shear stress between the two liquid layers is __________ proportional to the distance between two layers.
(A) Directly
(B) Inversely
(C) Both A and B
(D) None of these

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