# Test: Fluid Mechanics Level - 3

## 25 Questions MCQ Test Mechanical Engineering SSC JE (Technical) | Test: Fluid Mechanics Level - 3

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Attempt Test: Fluid Mechanics Level - 3 | 25 questions in 50 minutes | Mock test for Mechanical Engineering preparation | Free important questions MCQ to study Mechanical Engineering SSC JE (Technical) for Mechanical Engineering Exam | Download free PDF with solutions
QUESTION: 1

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QUESTION: 2

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QUESTION: 3

### The line of action of the buoyant force acts through the centroid of the

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QUESTION: 4

The time oscillation of a floating body with increase in metacentric height will be

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QUESTION: 5

The velocity at the exit of the pipe as shown in the below figure will be Solution:
QUESTION: 6

The following terms relate to floating bodies :
Centre of gravity .....G
Meta Centre .....M
Weight of floating body.....W
Buoyant force ......FB
Match List I with List II and select these correct answer Solution:
QUESTION: 7

Match List I with List II and select the correct answer. Solution:

Explanation : a) A fluid that has no resistance to shear stress is known as an ideal or inviscid fluid. Zero viscosity is observed only at very low temperatures in superfluids. Otherwise, the second law of thermodynamics requires all fluids to have positive viscosity; such fluids are technically said to be viscous or viscid.

A Newtonian fluid is one whose viscosity is not affected by shear rate: all else being equal, flow speeds or shear rates do not change the viscosity.

The liquid which wets the wall of tube rises in the tube and the liquid which does not wet the wall of the tube descends in the tube. For example, when a glass capillary tube is dipped in water, water rises in the tube and the shape of water meniscus in concave, similarly when a glass capillary tube is dipped into mercury; mercury descends in the tube and the shape of mercury meniscus is convex.

QUESTION: 8

Match List I with List II and select the correct answer Solution:
QUESTION: 9

Match List I (fluid properties) with List II (related terms) and select the correct answer. Solution:
QUESTION: 10

Match List I with List II and select the correct answer. Solution:
QUESTION: 11

Newton's law of viscosity for a fluid states that the shear stress is

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QUESTION: 12

A vertically immersed surface is shown in the below figure. The distance of its centre of pressure from the water surface is Solution:
QUESTION: 13

If angle of contact of a drop of liquid is acute than

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QUESTION: 14

Match List I (Physical properties of fluid) with List II (Dimensions/definitions) and select the correct answer using the codes given below the lists: Solution:
QUESTION: 15

An increase in pressure of 2 bars decreases the volume of a liquid by 0.01 percent. The bulk modulus of elasticity of the liquid is

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QUESTION: 16

The pressure inside a soap bubble of 50 mm diameter is 25 N/m2 above the atmospheric pressure. What is the surface tension is soap film

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QUESTION: 17

Bourdon gauge measures

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QUESTION: 18

When can a piezometer be not used for pressure measurement in pipes

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QUESTION: 19

How is the difference of pressure head h measured by mercury oil differential manometer expressed

where × = Manometer reading Sg and So are the specific gravities of mercury and oil respectively

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QUESTION: 20

In order to increase sensitivity of U-tube manometer, one leg is usually inclined by angle sensitivity of inclined tube to sensitivity of Utube equal to

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QUESTION: 21

In figure if the pressure of gas in bulb A is 50 cm Hg vacuum and Patm = 76 cm Hg, the height of column H is equal to Solution:
QUESTION: 22

A U-tube manometer is used to measure the pressure in an oil pipe A as shown in the figure. The specific gravity of the oil is 0.8 and that of mercury is 13.6. The equivalent gauge pressure is nearly. Solution:
QUESTION: 23

A multi-tube manometer filled with water up to level A, B and C as shown in the figure is rotated about the vertical axis at A. The water levels at A, B and C will all lie on Solution:
QUESTION: 24 A U-tube manometer shown attached to an air pipe reads a height of 20 cm of mercury as shown. What is the pressure in kPa in the air pipe ?

Solution:
QUESTION: 25

A metal block is thrown into deep lake. As it sinks deeper in water, the buoyant force acting on it

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