# Book 1: Chapter No 6 Fluid Dynamics

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## Book 1: Chapter No 6

Fluid Dynamics

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Question 1 |

The Law of conservation of mass gives us the equation of

A | stocke's law |

B | Discontinuity |

C | Continuity |

D | Bernoulli's Theorem |

Question 2 |

The Law of conservation of Energy is the basis of

A | Carnot's Thoeorem |

B | Stock's Theorem |

C | Bernoulli's Theorem |

D | None of the Above |

Question 3 |

The Word fluid means?

A | To raise |

B | to fall |

C | to flow |

D | to oppose |

Question 4 |

The Study of properties of fluids at rest is called

A | fluid statics |

B | fluid dynamics |

C | both(a) and (b) |

D | dynamics |

Question 5 |

The study of properties of fluids in motion is called

A | dynamics |

B | fluid dynamics |

C | fluid statics |

D | None of them |

Question 6 |

Internal Friction of a Fluid is called

A | Surface Tension |

B | Resistance |

C | Viscosity |

D | Cohesive Force |

Question 7 |

Thick tar and Honey have

A | Small Co-efficient of Viscosties |

B | Moderate Co-efficient of Viscosties |

C | Large Co-efficient of Viscosties |

D | Zero Co-efficient of Viscosties |

Question 8 |

The Basic Formula of the Frictional Force F in a Liquid was first Suggested by

A | Maxwell |

B | Newton |

C | Plark |

D | Galileo |

Question 9 |

The Frictional Effect Betwnn different Layers of a flowing fluid is describe in terms of

A | Viscosity of Liquid |

B | Velocity of Fluid |

C | Acceleration of a Fluid |

D | Pressure of a fluid |

Question 10 |

The Force Required to slide one layer of liquid over another layer is measured by

A | Momentum |

B | Velocity |

C | viscosity |

D | Acceleration |

Question 11 |

Viscosity of water is-------------- that of air but---------------------- that of plasma.

A | More, more |

B | Less, more |

C | Less, less |

D | More, less |

Question 12 |

Stoke's law holds for:

A | Motion through free space |

B | Motion through viscous medium |

C | Bodies of all shapes |

D | None of these |

Question 13 |

High speed meteors rushing through air reduces to ashes because of:

A | Force of gravity |

B | High resistance of air |

C | Drag force |

D | None of these |

Question 14 |

The terminal velocity of a spherical object is given by

A | Vt=2pgr^2/9n |

B | vt=mg/6pai(nrv) |

C | Any of these |

D | None of these |

Question 15 |

A massive object falls through a fluid:

A | Faster |

B | Slower |

C | Slowest |

D | None |

Question 16 |

Terminal velocity is the maximum velocity attained by a spherical droplet when the drag force--------- the weight of droplet.

A | Is smaller than |

B | Is greater than |

C | Becomes equal to |

D | None of these |

Question 17 |

The--------- viscous a medium is,-------- is the value of terminal velocity of the droplet.

A | More, lesser |

B | Lesser, more |

C | Both A and B |

D | Lesser, lesser |

Question 18 |

When the droplet moves with terminal velocity in a fluid, the net force acting on the droplet is:

A | FD-mg |

B | Zero |

C | mg-FD |

D | None of these |

Question 19 |

wo copper balls of 1 cm and 2 cm in diameter are simultaneously dropped in the same viscous medium. The terminal velocity of bigger ball is

A | Not affected due to its size |

B | Twice that of small size ball |

C | Four times that of small size ball |

D | 1/4th of that of small size ball |

Question 20 |

At high speeds, fluid friction-----------and fuel consumption---------

A | Increases, decreases |

B | Increases, increases |

C | Decreases, increases |

D | None of these |

Question 21 |

Fog droplets are suspended in air when their weight is balanced by:

A | Force of gravity |

B | Upward thrust due to air |

C | Surface tension |

D | None of these |

Question 22 |

Drag force increases if speed of the object moving through the fluid:

A | Increases |

B | Decreases |

C | Remains constant |

D | None of these |

Question 23 |

Stoke's law is not applicable when the speed of the object moving through a fluid is:

A | Zero |

B | Small |

C | Large |

D | None of these |

Question 24 |

0.10 cm can be written as:

A | 1.0 x 10-2 in |

B | 1.0 x 10-3 cm |

C | 1.0x10-4 cm |

D | 1.x 10-4 m |

Question 25 |

When the upward drag force of the fluid becomes equal to downward force of gravity of the droplet, then its velocity:

A | Starts increasing |

B | Starts decreasing |

C | Becomes constant |

D | Is called escape velocity |

Question 26 |

The unit of viscosity in SI system is:

A | kg-1 m sec"1 |

B | kg m-1 sec-1 |

C | kg-1 m-1 sec |

D | None of these |

Question 27 |

The dimensions of viscosity are

A | M2L-1'T-2 |

B | M-1L1T-1 |

C | M-1L-1T |

D | ML-1T-1 |

Question 28 |

Study of fluids in motion basically involves law of conservation of:

A | Mass |

B | Energy |

C | Charge |

D | Both A and B |

Question 29 |

In a----------------------flow, each particle of the fluid is called a streamline and different streamlines---------------------cross each other.

A | Streamline, cannot |

B | Turbulent, cannot |

C | Streamline, can |

D | None of these |

Question 30 |

The direction of the velocity of fluid at certain point and direction of streamline are

A | Same |

B | Different from each other |

C | Diverging |

D | Converging |

Question 31 |

The irregular or unsteady flow of the fluid is called:

A | Laminar flow |

B | Turbulent flow |

C | Streamline flow |

D | Both A and C |

Question 32 |

If the fluid is--------------and flow is--------------------, then mass is conserved.

A | Incompressible, unsteady |

B | Compressible, steady |

C | Compressible, unsteady |

D | Incompressible, steady |

Question 33 |

Ratio of mass to density gives

A | Volume |

B | Pressure |

C | Energy |

D | (Volume)-1 |

Question 34 |

Front A1V1 - A2v2, it follows that velocity of flow in a pipe is----------------- where there is constriction in the cross-section.

A | Greater |

B | Smaller |

C | Same |

D | None of these |

Question 35 |

Turbulent flow is:

A | Unsteady and regular |

B | Steady and irregular |

C | Unsteady and irregular |

D | None of these |

Question 36 |

As the water falls from a tap, the speed of water------------------and so its cross-sectional area-------------.

A | Increases, decreases |

B | Decreases, increases |

C | Increases, increases |

D | None of these |

Question 37 |

Unit of density to mass ratio is:

A | m3 |

B | m-3 |

C | kg-m-3 |

D | None of these |

Question 38 |

In a steady flow of an incompressible fluid, the rate offlow of mass inward is equal to rate offlow of mass outward. This is statement of

A | Bernoulli's equation |

B | Venturi equation |

C | Equation of continuity |

D | Torricelli's theorem |

Question 39 |

We can infer from Bernoulli's theorem that where the speed of the fluid is high, there the pressure will be:

A | High |

B | Low |

C | Sometimes high, sometimes low |

D | None of these |

Question 40 |

The pipe near the low end of a large water storage tank develops a small leak and a stream of water shoots from it. The top of water in the tank is 15 m above the point of leak. The water will rush from the hole at a speed of:

A | 37 msec-1 |

B | 7 msec-1 |

C | 27 msec-1 |

D | 17 msec-1 |

Question 41 |

Chimney works--------------when it is

A | Worst, tall |

B | Best, tall |

C | Best, small |

D | Worst, small |

Question 42 |

Bernoulli's equation is the equation that relates

A | Pressure, â€¢ volume and temperature |

B | Fluid speed, temperature and height |

C | Height, fluid speed and pressure |

D | None of these |

Question 43 |

The action of perfume bottles depends upon:

A | Bernoulli's theorem |

B | Equation of continuity |

C | Surface tension |

D | None of these |

Question 44 |

If velocity of efflux is 100 m sec-1 and area of the hole is 0.06 cm2, how much volume of water will flow out of the hole in one second

A | 6 x 10-4 m3 |

B | 6.0 m3 |

C | 600 m3 |

D | 6.0 cm3 |

Question 45 |

Bernoulli's theorem states that sum of pressure and kinetic and potential energies per unit---------------of an incompressible and----------------fluid remains constant

A | Volume, viscous |

B | Area, non-viscous |

C | Area, viscous |

D | Volume, non-viscous |

Question 46 |

Torricelli's theorem states that speed of efflux is--------------------the velocity gained by the liquid in falling through the distance h under the action of---------------.

A | Equal to, gravity |

B | Equal to, surface tension |

C | Smaller than, gravity |

D | Greater than, drag force |

Question 47 |

In deriving Bernoulli's equation, we assume that fluid is:

A | Compressible, viscous and flow is turbulent |

B | Incompressible, non-viscous and flow is steady state |

C | Incompressible, viscous and flow is steady state |

D | None of above flow is steady state |

Question 48 |

The unit of pgh in Bernoulli's equation is:

A | Pressure |

B | Volume |

C | Work |

D | Force |

Question 49 |

Fluid means

A | Solid |

B | Liquid |

C | Gas |

D | Both B and C |

Question 50 |

For substances (like honey) that do not flow easily have ----------------coefficients of viscosity.

A | Small |

B | Very small |

C | Large |

D | Zero |

Question 51 |

Water flows through a hose of internal area of cross-section equal to 1 cm2, at a speed of I m/sec. If the water is to come out at 20 m/sec, then the internal area of cross- section of the nozzle will be:

A | 5 x 10-2 cm2 |

B | 5 x 10-1 (mm)2 |

C | 5 x 10-3 m2 |

D | 5 x 10-6 m2 |

Question 52 |

When the fluid is in motion, its flow may be:

A | Streamline |

B | Turbulent |

C | AorB |

D | None of these |

Question 53 |

Streamline flow is also called

A | Viscous flow |

B | Laminar flow |

C | Compressible flow |

D | Ail of these |

Question 54 |

Above certain velocity of the fluid flow, the motion of the fluid becomes:

A | Steady and regular |

B | Unsteady and regular |

C | Steady and irregular |

D | Unsteady and irregular |

Question 55 |

To understand behaviour of a fluid in motion, we must suppose that fluid:

A | Is non-viscous |

B | Is incompressible |

C | Motion is steady |

D | All of these |

Question 56 |

1000 kg/m3 is equivalent to:

A | 1000gms/cm3' |

B | 1 gm/cm3 |

C | 10 kg/cm3 |

D | None of these |

Question 57 |

While deriving Bernoulli's equation, the law of conservation of becomes the base fact.

A | Mass |

B | Energy |

C | Charge |

D | Ampere |

Question 58 |

The internal diameter of a hose is 2 mm. Its radius will be:

A | 10-4 cm , |

B | 1O-3 cm |

C | 10-2 cm |

D | 10-1cm |

Question 59 |

While deriving equation of continuity, the law of conservation of---------------becomes the base fact:

A | Mass |

B | Energy |

C | Charge |

D | All of them |

Question 60 |

An equation in fluid dynamics relates pressure, fluid speed and height. This equation is called:

A | Equation of continuity |

B | Bernoulli's equation |

C | Venturi equation |

D | None of these |

Question 61 |

If A, v, t denote area of the pipe, velocity of the fluid and time, respectively, then Avt will represent:

A | Density |

B | Mass |

C | Charge |

D | Volume |

Question 62 |

Torricelli's theorem is an application of

A | Bernouli's equation |

B | Equation of continuity |

C | Venturi equation |

D | None of them |

Question 63 |

Normally, the pressure of blood inside the walls is------------------the external atmospheric pressure.

A | Equal to |

B | Greater than |

C | Smaller than |

D | None of them |

Question 64 |

Normally, the blood pressure (torr unit) in a healthy human body varies from:

A | 200 to 100 |

B | 150 to 70 |

C | 120. to 80 |

D | 100 to 60 |

Question 65 |

As the human gets old, his blood pressure numbers tend to-------------due to----------------------in the flexibility of vessel walls.

A | Increase, decrease |

B | Decrease, increase |

C | Increase, increase |

D | Decrease, decrease |

Question 66 |

Systolic pressure means -------------and diastolic pressure means----------------blood pressure.

A | High, low |

B | Low, high |

C | Low, low |

D | None of these |

Question 67 |

The units for measuring blood pressure are:

A | Torr and mm of Hg |

B | Torr and N/m2 |

C | mm of Hg and N/m2 |

D | None of above |

Question 68 |

Blood is---------------fluid having a density------------------that of water.

A | An incompressible, nearly equal |

B | Compressible, less than to |

C | Compressible, nearly equal to |

D | None of these |

Question 69 |

A high concentration of RBC (red blood cells) in the blood-------------its viscosity three to five times that of-----------------.

A | Increases, oil |

B | Decreases, water |

C | Decreases, plasma |

D | Increases, water |

Question 70 |

Blood vessels are------------------and they stretch like a rubber hose.

A | Rigid |

B | Not rigid |

C | Very hard |

D | None of these |

Question 71 |

A sphygmomanometer is an instrument used to:

A | Get an X-ray photograph |

B | Measure blood pressure |

C | Test the blood group , |

D | None of these. |

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