# Practice Test: Question Set - 21

**1. Viscosity of water in comparison to mercury is**

- (A) Higher

- (B) Lower

- (C) Same

- (D) Higher/lower
depending on temperature

**2. The power transmitted through the pipe is maximum when the head lost due to friction is equal to**

- (A) One-fourth
of the total supply head

- (B) One-third of
the total supply head

- (C) One-half of
the total supply head

- (D) Two-third of
the total supply head

**3. Falling drops of water become spheres due to the property of**

- (A) Adhesion

- (B) Cohesion

- (C) Surface tension

- (D) Viscosity

**4. A hemispherical tank of radius (**

*R*) has an orifice of cross-sectional area (*a*) at its bottom and is full of liquid. The time required to empty the tank completely is- (A)

*14π R*

^{1/2}/15C_{d}× a √(2g)- (B)

*14π R*

^{3/2}/15C_{d}× a √(2g)- (C)

*14π R*

^{5/2}/15C_{d}× a √(2g)- (D)

*14π R*

^{7/2}/15C_{d}× a √(2g)**5. The difference of pressure between the inside and outside of a liquid drop is**

- (A)

*p = T × r*

- (B)

*p = T/r*

- (C)

*p = T/2r*

- (D)

*p = 2T/r*

**6. A venturi-flume is used to measure**

- (A) Pressure of
liquid

- (B) Discharge
of liquid

- (C) Pressure
difference between two points in a channel

- (D) Pressure
difference between two points in a pipe

**7. Working principle of dead weight pressure gauge tester is based on**

- (A) Pascal's law

- (B) Dalton's law of
partial pressure

- (C) Newton's law of viscosity

- (D) Avogadro's hypothesis

**8. The meatcentric height of a ship is 0.6 m and the radius of gyration is 4 m. The time of rolling of a ship is**

- (A) 4.1 sec

- (B) 5.2 sec

- (C) 10.4 sec

- (D) 14.1 sec

**9. The discharge through a channel of rectangular section will be maximum, if**

- (A) Its depth is
twice the breadth

- (B) Its breadth
is twice the depth

- (C) Its depth is
thrice the breadth

- (D) Its breadth
is thrice the depth

**10. The discharge through a channel of circular section will be maximum when the depth of water is __________ the diameter of the circular channel.**

- (A) 0.34 times

- (B) 0.67 times

- (C) 0.81 times

- (D) 0.95 times

**11. Uniform flow occurs when**

- (A) The flow is steady

- (B) The flow is
streamline

- (C) Size and shape of the cross section in a
particular length remain constant

- (D) Size and cross section change uniformly
along length

**12. Bulk modulus of a fluid is the ratio of**

- (A) Shear
stress to shear strain

- (B) Increase
in volume to the viscosity of fluid

- (C) Increase
in pressure to the volumetric strain

- (D) Critical
velocity to the viscosity of fluid

**13. The pressure in Pascal’s at a depth of 1 m below the free surface of a body of water will be equal to**

- (A) 1 Pa

- (B) 91 Pa

- (C) 981 Pa

- (D) 9810 Pa

**14. An average value of coefficient of velocity is**

- (A) 0.62

- (B) 0.76

- (C) 0.84

- (D) 0.97

**15. A liquid would wet the solid, if adhesion forces as compared to cohesion forces are**

- (A) Less

- (B) More

- (C) Equal

- (D) Less at low temperature and more at high
temperature

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