# Fluid Mechanics MCQ – Fluid Properties – Set 4 (18 MCQs)

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#### Fluid Mechanics MCQ – Fluid Properties – Set 4 (18 MCQs)

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#### Question No.1

The mass of a body weighing 60 kg is :

• 6.12 kg
• 60 N
• 60 kg
• 6.12 N

#### Question No.2

Which of the following statements correctly describe the relation between temperature and the viscosities of liquids and gases ?

• Viscosity increases with the increase in temperature of liquids and decreases with the increase in temperature of gases
• Viscosity increases with the increase in temperature of liquids and increases with the increase in temperature of gases
• Viscosity decreases with the increase in temperature of liquids and decreases with the increase in temperature of gases
• Viscosity decreases with the increase in temperature of liquids and increases with the increase in temperature of gases

#### Question No.3

The density of a liquid on the moon will be …... if its density on the earth is 1000 kg/m3 (gmoon = 1/6 gearth).

• 166.67 kg/m3
• 62.43 lb/ft3
• 1000 kg/m3
• 166.67 lb/ft3

#### Question No.4

The viscosity of Newtonian fluids relates the variation of shear stress with :

• strain
• shear strain
• rate of shear strain
• none of the mentioned

#### Question No.5

Three fluids 1, 2 & 3 have Bulk Moduli of elasticity of K1, K2 & K3 respectively. If K1 > K2 > K3, which liquid will have the highest compressibility ?

• liquid 1
• liquid 2
• liquid 3
• they are all equal

#### Question No.6

The kinematic viscosity of a fluid of specific gravity = 0.9 and viscosity of 0.05 poise is :

• $0.056{\rm{ Stoke}}$
• $5.56 \times {10^{ - 4}}{m^2}/s$
• $5.56 \times {10^{ - 5}}{m^2}/s$
• $5.56 \times {10^{ - 7}}{m^2}/s$

#### Question No.7

The internal pressure of a 25 mm diameter soap bubble (σ = 0.5 N/m) is :

• 80 N/m2
• 160 N/m2
• 40 N/m2
• 320 N/m2

#### Question No.8

The dimensions of Bulk Modulus of Elasticity is :

• ${M^0}{L^0}{T^0}$
• ${M^2}{L^{ - 1}}{T^0}$
• ${M^0}{L^2}{T^1}$
• ${M^1}{L^{ - 1}}{T^{ - 2}}$

#### Question No.9

The relation between shear stress Z and velocity gradient du/dy of a fluid is given by :

$Z = A{\left( {\frac{{du}}{{dy}}} \right)^n}$

Where A and n are constants. If n = 1, what is the type of the fluid ?

• Newtonian fluid
• Non-Newtonian fluid
• Bingham plastic
• none of the above

If you are searching for more Fluid Mechanics MCQ (Multiple Choice Questions) covering different Fluid Mechanics topics, you can check the following MCQs.

#### Question No.10

The ratio of the surface tension and density of liquids 1 and 2 are 1:2 and 1:4, respectively. Equal amount of the two liquids is poured into two identical capillary tubes. What will be the ratio of the capillary rise in the two tubes ? (the angle of contact is the same for the two liquids).

• 1:2
• 2:1
• 8:1
• 1:8

#### Question No.11

If a fluid, which has a constant specific gravity, is taken to a planet where the gravitational acceleration is 3 times compared to its value on earth, what will happen to its kinematic viscosity ?

• It increases
• It decreases
• It remains constant
• None of the above

#### Question No.12

For the following figure, the area of the graph that represents the gas phase is :

• A
• B
• C
• none of the mentioned

#### Question No.13

At P = 30 atm in the following figure, the boiling point of this substance is :

• $- 105^\circ C$
• $200^\circ C$
• $50^\circ C$
• $0^\circ C$

#### Question No.14

At P = 30 atm in the following figure, the melting point of this substance is :

• $- 105^\circ C$
• $200^\circ C$
• $50^\circ C$
• $0^\circ C$

#### Question No.15

The triple point of this substance in the following figure occurs at :

•  $T = 200^\circ C,P = 300{\rm{ atm}}$
• $T = - 15^\circ C,P = 1{\rm{ atm}}$
• $T = 0^\circ C,P = 6{\rm{ atm}}$
• $T = - 15^\circ C,P = 6{\rm{ atm}}$

#### Question No.16

A small amount of solvent is added to the ground water to change its electrolytic content. As a result, the contact angle, representing the adhesion between water and soil material, is increased from 30o to 42o while the surface tension decreases by 10 percent. If the soil has uniform pore size of 0.7 mm, the change of capillary rise in the soil h2 / h1 is equal to :

• 0.50
• 1.00
• 0.77
• 2.00

#### Question No.17

The water pressure in a 150 cm diameter pipe 2,000 m long is 30 N/cm2. If the pressure increases to 300 N/cm2, assuming the pipe is rigid ( the pipe has constant volume ) and consider the bulk modulus of elasticity of water is 2075 MPa, the relation between m1 and m2 : (Where m is the mass of water inside the pipe).

• ${m_2} = {\rm{1}}{\rm{.0013 }}{m_1}$
• ${m_2} = {\rm{ }}{m_1}$
• ${m_2} = {\rm{ 2 }}{m_1}$
• None of the above

#### Question No.18

The force required to drag a small barge ( 3 m × 3 m ) in a shallow canal where the water depth is 7.5 cm in order to maintain a velocity of 1.5 m/sec. ( Dynamic viscosity is 0.001 N.sec/m2 ) :

• 1.8 N
• 18 N
• 0.18 N
• 180 N

After you have checked the Fluid Mechanics MCQ, you can check the model answers for those MCQ on the following link :

Start now with Fluid Mechanics MCQ - Fluid Properties - Set 4

### More Fluid Mechanics MCQ covering "Fluid Properties"

Fluid Mechanics MCQ - Fluid Properties - Set 1

Fluid Mechanics MCQ - Fluid Properties - Set 2

Fluid Mechanics MCQ - Fluid Properties - Set 3