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You need to login to ask any Questions from chapter pressure-and-its-measurement of Fluid-Mechanics-Mcqs

Chapter:

pressure-and-its-measurement

1. As we go upwards, at height re is slight decrease in pressure variation.

True False

True

There is slight decrease in pressure as value of g (acceleration due to gravity) decreases slightly as we go higher.

Hint Answer

2. The pressure at a point in fluid is 4.9 N/cm2. Find height when fluid under consideration is in oil of specific gravity of 0.85.

5.83 m 11.66 m 17.49 m 8.74 m

5.83 m

Height=p/?g
=48620/850*9.81
=5.83 m.

Hint Answer

3. Why is large reservoir used in single column manometer?

In order to enhance the change in level of liquid in reservoir In order to negate the effects of change in level due to pressure variation In order to reduce the effect due to dynamic pressure variation due to motion None of the mentioned

In order to negate the effects of change in level due to pressure variation

Single column manometer directly gives pressure by measuring height in or limb and due to large cross sectional area of reservoir, for any variation in pressure, change can be neglected.

Hint Answer

4. A beaker of height 30 cm is partially filled with a liquid and is rotated by an angle θ as shown.
At this point, pressure at point B is found to be 5 bar. By what angle should θ be increased such that pressure at B gets halved?

$A beaker of height 30 cm is partially filled with a liquid and is rotated by an angle θ as shown.\r\nAt this point, pressure at point B is found to be 5 bar. By what angle should θ be increased such that pressure at B gets halved?\r\n \r\n$

12^o 15^o 17^o 20^o

15^o

Let ?₁ and ?₂ be angles at which beaker is inclided for two cases mentioned.
10³ * 9.81 * 0.15 * cos ?₁ = 5 * 100; ?₁ = 70.12^o

10³ * 9.81 * 0.3 * cos ?₂ = ¹?₂ * 5 * 100; ?₁ = 85.12^o

?₂ ? ?₁ = 15^o

Hint Answer

5. An open tank contains water upto a depth of 350 cm and above it an oil of specific gravity 0.65 for a depth of 2.5 m. Find pressure intensity at extreme bottom of tank.

5.027 N/cm² 10.05 N/cm² 2.51 N/cm² None of the mentioned

5.027 N/cm²

p= (specific gravity of water* height of water + specific gravity of oil* height of oil) * 9.81
= 5.027 N/cm².

Hint Answer

6. A beaker of height 10 cm is half-filled with water (S_w = 1) and half-filled with oil (S_o = 1). At what distance (in cm) from base will pressure be half pressure at base of beaker?

$A beaker of height 10 cm is half-filled with water (Sw = 1) and half-filled with oil (So = 1). At what distance (in cm) from base will pressure be half pressure at base of beaker?\r\n \r\n$

4.375 4.5 5.5 5.625

4.5

Gauge pressure at base of beaker = S_o * 10³ * 0.05 * g + S_w * 10³ * 0.05 * g = 882.9Pa. Let required height be h m from base.
If 0.05 ? h < 0.1,
800(0.1 ? h)g = ¹?₂ * 882.9
Thus, h = 0.04375 (out of range considered).
If 0 < h ? 0:05,
800 * 0.05 * g + 10³ * (0.05 ? h) * g = ¹?₂ * 882.9
Thus, h = 0.045 (in range considered). Hence, correct answer will be 45 cm.

Hint Answer

7. Which one of following statements is true regarding pressure?

Pressure is a scalar quantity Pressure is a vector quantity Pressure is a scalar quantity only when the area is infinitesimally small Pressure is a vector quantity only when the area is infinitesimally small

Pressure is a scalar quantity

Pressure is defined as force per unit area acting normal to a surface. Both force and area are vectors, but division of one by or leads to a scalar quantity.

Hint Answer

8. A beaker of height h is completely filled with water. Now two-third of liquid is replaced by anor liquid. If pressure at base of beaker doubled, what is specific gravity of liquid poured?

0.5 1 2 2.5

2.5

Pressure at base initially = S_w * ^h?₃ * g; Pressure at base after pouring second liquid = S_w * ^h?₃ * g + S_l * ^2h?₃ * g, where S_w and S_l are specific gravities of water and second liquid.

$A beaker of height h is completely filled with water. Now two-third of liquid is replaced by anor liquid. If pressure at base of beaker doubled, what is specific gravity of liquid poured?\r\n$

Hint Answer

9. Manometers are pressure measuring devices which use principle of dynamic pressure to measure pressure difference.

True False

False

Manometers are pressure measuring devices which use principle of pressure due to static fluid (i.e column height) to measure pressure difference.

Hint Answer

10. A closed tank (of height 5 m) is P_Artially filled with a liquid as shown. If pressure of air above fluid is 2 bar, find pressure at bottom of tank. Assume density of liquid to vary according to following relation:

$A closed tank (of height 5 m) is PArtially filled with a liquid as shown. If pressure of air above fluid is 2 bar, find pressure at bottom of tank. Assume density of liquid to vary according to following relation:\r\n \r\nwhere y is height from base\r\n$

where y is height from base

2.12 2.15 2.18 2.5

2.18

The change of pressure P with vertical direction y is given by

$A closed tank (of height 5 m) is PArtially filled with a liquid as shown. If pressure of air above fluid is 2 bar, find pressure at bottom of tank. Assume density of liquid to vary according to following relation:\r\n \r\nwhere y is height from base\r\n$

Hint Answer

Nexttt

All Chapters

View all Chapter and number of question available From each chapter from Fluid-Mechanics-Mcqs

Properties of Fluids

Properties of Fluids

Pressure and Its Measurement

Pressure and Its Measurement

Hydrostatic Forces on Surfaces

Hydrostatic Forces on Surfaces

Buoyancy and Floatation

Buoyancy and Floatation

Kinematics of Flow and Ideal Flow

Kinematics of Flow and Ideal Flow

Fluid Dynamics

Orifices, Mouthpieces, Notches and Weirs

Orifices, Mouthpieces, Notches and Weirs

Viscous Flow & Turbulent Flow

Viscous Flow & Turbulent Flow

Flow Through Pipes

Flow Through Pipes

Indicator Diagrams

Indicator Diagrams

Dimensional and Model Analysis

Dimensional and Model Analysis

Boundary Layer Flow & Forces on Sub-merged Bodies

Boundary Layer Flow & Forces on Sub-merged Bodies

Compressible Flow

Compressible Flow

Flow in Open Channels

Flow in Open Channels

Non Uniform Flow in Channels

Non Uniform Flow in Channels

Impact of Jets and Jet Propulsion

Impact of Jets and Jet Propulsion

Topics

This Chapter pressure-and-its-measurement consists of the following topics

Pressure and Its Measurement

As we go upwards, at height re is slight decrease in pressure variation.

The pressure at a point in fluid is 4.9 N/cm2. Find height when fluid under consideration is in oil of specific gravity of 0.85.

Why is large reservoir used in single column manometer?

A beaker of height 30 cm is partially filled with a liquid and is rotated by an angle θ as shown.
At this point, pressure at point B is found to be 5 bar. By what angle should θ be increased such that pressure at B gets halved?

$A beaker of height 30 cm is partially filled with a liquid and is rotated by an angle θ as shown.\r\nAt this point, pressure at point B is found to be 5 bar. By what angle should θ be increased such that pressure at B gets halved?\r\n \r\n$

;

An open tank contains water upto a depth of 350 cm and above it an oil of specific gravity 0.65 for a depth of 2.5 m. Find pressure intensity at extreme bottom of tank.

A beaker of height 10 cm is half-filled with water (S_w = 1) and half-filled with oil (S_o = 1). At what distance (in cm) from base will pressure be half pressure at base of beaker?

$A beaker of height 10 cm is half-filled with water (Sw = 1) and half-filled with oil (So = 1). At what distance (in cm) from base will pressure be half pressure at base of beaker?\r\n \r\n$

;

Which one of following statements is true regarding pressure?

A beaker of height h is completely filled with water. Now two-third of liquid is replaced by anor liquid. If pressure at base of beaker doubled, what is specific gravity of liquid poured?

Manometers are pressure measuring devices which use principle of dynamic pressure to measure pressure difference.

A closed tank (of height 5 m) is P_Artially filled with a liquid as shown. If pressure of air above fluid is 2 bar, find pressure at bottom of tank. Assume density of liquid to vary according to following relation:

$A closed tank (of height 5 m) is PArtially filled with a liquid as shown. If pressure of air above fluid is 2 bar, find pressure at bottom of tank. Assume density of liquid to vary according to following relation:\r\n \r\nwhere y is height from base\r\n$

where y is height from base

;

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