When a body is placed over a liquid, it will sink down if

The property by virtue of which a liquid opposes relative motion between its different layers is called

A weir is said to be narrow-crested weir, if the width of the crest of the weir is half the height of water above the weir crest.

Euler’s dimensionless number relates the following

When a body floating in a liquid, is displaced slightly, it oscillates about

The pressure of the liquid flowing through the divergent portion of a Venturimeter

When the Mach number is between the flow is called super-sonic flow.

In an immersed body, centre of pressure is

Steady flow occurs when

A flow is called super-sonic if the

In a forced vortex, the velocity of flow everywhere within the fluid is

Mach number is significant in

A fluid which obeys the Newton’s law of viscosity is termed as

In order that flow takes place between two points in a pipeline, the differential pressure between these points must be more than

For similarity, in addition to models being geometrically similar to prototype, the following in both cases should also be equal

The value of coefficient of velocity for a sharp edged orifice with the head of water.

If cohesion between molecules of a fluid is greater than adhesion between fluid and glass, then the free level of fluid in a dipped glass tube will be

The ratio of the inertia force to the is called Euler’s number.

A one dimensional flow is one which

An opening in the side of a tank or vessel such that the liquid surface with the tank is below the top edge of the opening, is called

The property of fluid by virtue of which it offers resistance to shear is called

Coefficient of velocity is defined as the ratio of

The mass of 2.5 m3 of a certain liquid is 2 tonnes. Its mass density is

A fluid in equilibrium can’t sustain

When a plate is immersed in a liquid parallel to the flow, it will be subjected to a pressure that if the same plate is immersed perpendicular to the flow.

An object having 10 kg mass weighs 9.81 kg on a spring balance. The value of ‘g’ at this place is

A flow is called hyper-sonic, if the Mach number is

Liquids

When a cylindrical vessel containing liquid is resolved, the surface of the liquid takes the shape of

Fluid is a substance that

The force exerted by a moving fluid on an immersed body is directly proportional to the rate of change of momentum due to the presence of the body. This statement is called

The property of a fluid which enables it to resist tensile stress is known as

The loss of pressure head in case of laminar flow is proportional to

The surface tension of mercury at normal temperature compared to that of water is

An air vessel is provided at the summit in a siphon to

The unit of viscosity is

Select the correct statement

Choose the wrong statement. Alcohol is used in manometer, because

When a tank containing liquid moves with an acceleration in the horizontal direction, then the free surface of the liquid

A pressure of 25 m of head of water is equal to

The hammer blow in pipes occurs when

The resultant upward pressure of the fluid on an immersed body is called

When the water level on the downstream side of a weir is above the top surface of a weir, the weir is known as

If the surface of liquid is convex, men

The atmospheric pressure with rise in altitude decreases

Dynamic viscosity of most of the gases with rise in temperature

Center of buoyancy is the

For a body floating in a liquid the normal pressure exerted by the liquid acts at

Newton’s law of viscosity is a relationship between

Differential manometer is used to measure

When a body is immersed wholly or partially in a liquid, it is lifted up by a force equal to the weight of liquid displaced by the body. This statement is called

Non uniform flow occurs when

When a tube of smaller diameter is dipped in water, the water rises in the tube with an upward surface.

A piece of metal of specific gravity 7 floats in mercury of specific gravity 13.6. What fraction of its volume is under mercury?

A flow through an expanding tube at constant rate is called

Reynolds number is significant in

The loss of head due to friction in a pipe of uniform diameter in which a viscous flow is taking place, is (where RN = Reynold number)

Practical fluids

The tendency of a liquid surface to contract is due to the following property

The Newton’s law of resistance is based on the assumption that the

For manometer, a better liquid combination is one having

The flow in a pipe is neither laminar nor turbulent when Reynold number is

The point in the immersed body through which the resultant pressure of the liquid may be taken to act is known as

Stoke is the unit of

The vapour pressure over the concave surface is

The velocity at which the flow changes from laminar flow to turbulent flow is called

Mercury is often used in barometer because

A vertical wall is subjected to a pressure due to one kind of liquid, on one of its sides. Which of the following statement is correct?

Center of pressure compared to e.g. is

The centre of gravity of the volume of the liquid displaced by an immersed body is called

Gradually varied flow is

The viscosity of water at 20°C is

The velocity of jet of water travelling out of opening in a tank filled with water is proportional to

According to Bernoulli’s equation for steady ideal fluid flow

The discharge through a convergent mouthpiece is the discharge through an internal mouthpiece of the same diameter and head of water.

Bernoulli equation deals with the law of conservation of

Principle of similitude forms the basis of

The rise of liquid along the walls of a revolving cylinder about the initial level is the depression of the liquid at the axis of rotation.

Hot wire anemometer is used to measure

Venturimeter is used to

The two important forces for a floating body are

The kinematic viscosity of an oil (in stokes) whose specific gravity is 0.95 and viscosity 0.011 poise, is

According to the principle of buoyancy a body totally or partially immersed in a fluid will be lifted up by a force equal to

The pressure measured with the help of a pressure gauge is called

The total pressure force on a plane area is equal to the area multiplied by the intensity of pressure at the Centroid, if

The most economical section of a rectangular channel is one which has hydraulic mean depth or hydraulic radius equal to

Capillary action is due to the

The intensity of pressure on an immersed surface with the increase in depth.

Free surface of a liquid behaves like a sheet and tends to contract to smallest possible area due to the

Which of the following statement is correct?

A bucket of water is hanging from a spring balance. An iron piece is suspended into water without touching sides of bucket from another support. The spring balance reading will

A flow through a long pipe at constant rate is called

Choose the wrong statement

The unit of dynamic viscosity in S.I. units is

A perfect gas

In a free nappe,

In a static fluid

One litre of water occupies a volume of

A balloon lifting in air follows the following principle

The ratio of absolute viscosity to mass density is known as

Reynold’s number is the ratio of inertia force to

Metacentric height is given as the distance between

In a footstep bearing, if the speed of the shaft is doubled, then the torque required to overcome the viscous resistance will be

The continuity equation is connected with

The most economical section of a trapezoidal channel is one which has hydraulic mean depth equal to

The speed of sound in a ideal gas varies directly as it’s

The absolute pressure is equal to

Unit of surface tension is

A Piezometer tube is used only for measuring

The capillary rise at 20°C in a clean glass tube of 1 mm bore containing water is approximately

The Cipoletti weir is a weir.

Pressure of the order of 10″ torr can be measured by

The volume of a fluid as the pressure increases.

Buoyant force is

A flow through a long pipe at decreasing rate is called uniform flow.

Choose the wrong statement

The intensity of pressure at any point, in a liquid, is to the depth of liquid from the surface.

True one-dimensional flow occurs when

The discharge in an open channel corresponding to critical depth is

A piece of wood having weight 5 kg floats in water with 60% of its volume under the liquid. The specific gravity of wood is

A pitot tube is used to measure the

The total energy of each particle at various places in the case of perfect incompressible fluid flowing in continuous stream

The critical depth meter is used to measure

Two pipe systems can be said to be equivalent, when the following quantities are same

In a footstep bearing, if the radius of the shaft is doubled, then the torque required to overcome the viscous resistance will be

Surface tension has the units of

The value of bulk modulus of a fluid is required to determine

Fluid is a substance which offers no resistance to change of

The pressure less than atmospheric pressure is known as

The normal stress in a fluid will be constant in all directions at a point only if

If ‘W is the specific weight of liquid and ‘k the depth of any point from the surface, then pressure intensity at that point will be

A compound pipe is required to be replaced by a new pipe. The two pipes are said to be equivalent, if

The center of gravity of the volume of the liquid displaced by an immersed body is called

A flow is called sub-sonic, if the Mach number is

Barometer is used to measure

The hydraulic gradient line lies over the centre line of the pipe by an amount equal to the

The center of pressure of a surface subjected to fluid pressure is the point

The variation in the volume of a liquid with the variation of pressure is called its

The surface tension of mercury at normal temperature is that of water.

Flow of water in a pipe about 3 metres in diameter can be measured by

The equation of continuity holds good when the flow

A thick liquid like syrup has a viscosity than a light liquid like water.

Cavitation will begin when

When a liquid is flowing through a pipe, the velocity of the liquid is

Metacentric height is the distance between the metacentre and

The velocity through a channel of circular section will be maximum when the depth of water is the diameter of the circular channel.

Resultant pressure of the liquid in the case of an immersed body acts through

A fluid is said to be ideal, if it is

In a depressed nappe

The value of the coefficient of compressibility for water at ordinary pressure and temperature in kg/cm is equal to

In one dimensional flow, the flow

To avoid vaporisation in the pipe line, the pipe line over the ridge is laid such that it is not more than

Metacentre is the point of intersection of

The imaginary line drawn in the fluid in such a way that the tangent to any point gives the direction of motion at that point, is known as

An open vessel of water is accelerated up an inclined plane. The free water surface will

The discharge over a rectangular notch is

The flow in which each liquid particle has a definite path and their paths do not cross each other is called

The magnitude of water hammer depends upon the

The fluid forces considered in the Navier Stokes equation are

When the Venturimeter is inclined, then for a given flow it will show reading.

Cavitation is caused by

A vertical wall is subjected to a pressure due to one kind of liquid, on one of its sides. The total pressure on the wall acts at a distance from the liquid surface.

An ideal flow of any fluid must fulfill the following

The flow in a pipe or channel is said to be uniform when

Surface tension

Select the wrong statement

Alcohol is used in manometers because

If no resistance is encountered by displacement, such a substance is known as

The kinematic viscosity is the

Choose the correct relationship

The viscosity of water is than that of mercury.