The pressure in Pascals at a depth of 1 m below the free surface of a body of water will be equal to
1 Pa
91 Pa
981 Pa
9810 Pa
Correct Answer :
D. 9810 Pa
Related Questions
In an immersed body, centre of pressure is
At the centre of gravity
Above the centre of gravity
Below be centre of gravity
Could be above or below e.g. depending on density of body and liquid
If the atmospheric pressure on the surface of an oil tank (sp. gr. 0.8) is 0.2 kg/cm, the pressure at a depth of 50 m below the oil surface will be
2 meters of water column
3 meters of water column
5 meters of water column
6 meters of water Column
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)
1/RN
4/RN
16/RN
64/RN
The discharge over a triangular notch is
Inversely proportional to H3/2
Directly proportional to H3/2
Inversely proportional to H5/2
Directly proportional to H5/2
A pitot tube is used to measure the
Velocity of flow at the required point in a pipe
Pressure difference between two points in a pipe
Total pressure of liquid flowing in a pipe
Discharge through a pipe
The equation of continuity holds good when the flow
Is steady
Is one dimensional
Velocity is uniform at all the cross sections
All of the above
Specific weight of sea water is more that of pure water because it contains
Dissolved air
Dissolved salt
Suspended matter
All of the above
The flow in which the velocity vector is identical in magnitude and direction at every point, for any given instant, is known as
One dimensional flow
Uniform flow
Steady flow
Turbulent flow
Which of the following instrument can be used for measuring speed of an aeroplane?
Venturimeter
Orifice plate
Pitot tube
Rotameter
A flow in which the quantity of liquid flowing per second is not constant, is called
Streamline flow
Turbulent flow
Steady flow
Unsteady flow
Choose the wrong statement. Alcohol is used in manometer, because
Its vapour pressure is low
It provides suitable meniscus for the inclined tube
Its density is less
It provides longer length for a given pressure difference
The intensity of pressure on an immersed surface __________ with the increase in depth.
Does not change
Increases
Decreases
None of these
The velocity at which the laminar flow stops, is known as
Velocity of approach
Lower critical velocity
Higher critical velocity
None of these
The torque required to overcome viscous resistance of a footstep bearing is (where μ = Viscosity of the oil, N = Speed of the shaft, R = Radius of the shaft, and t = Thickness of the oil film)
μπ²NR/60t
μπ²NR²/60t
μπ²NR³/60t
μπ²NR⁴/60t
In order to measure the flow with a Venturimeter, it is installed in
Horizontal line
Inclined line with flow upwards
Inclined line with flow downwards
Any direction and in any location
The ratio of specific weight of a liquid to the specific weight of pure water at a standard temperature is called
Density of liquid
Specific gravity of liquid
Compressibility of liquid
Surface tension of liquid
The maximum discharge over a broad crested weir is
0.384 Cd × L × H1/2
0.384 Cd × L × H3/2
1.71 Cd × L × H1/2
1.71 Cd × L × H3/2
In a forced vortex, the velocity of flow everywhere within the fluid is
Maximum
Minimum
Zero
Nonzero finite
When a cylindrical vessel containing liquid is revolved about its vertical axis at a constant angular velocity, the pressure
Varies as the square of the radial distance
Increases linearly as its radial distance
Increases as the square of the radial distance
Decreases as the square of the radial distance
Bulk modulus of a fluid __________ as the pressure increases.
Remain same
Decreases
Increases
None of these
The pressure of the liquid flowing through the divergent portion of a Venturimeter
Remains constant
Increases
Decreases
Depends upon mass of liquid
The power transmitted through the nozzle is maximum when the head lost due to friction in the pipe is __________ of the total supply head.
One-half
One-third
Two-third
None of these
Metacentric height is given as the distance between
The center of gravity of the body and the metacentre
The center of gravity of the body and the center of buoyancy
The center of gravity of the body and the center of pressure
Center of buoyancy and metacentre
The most efficient section of a channel is
Triangular
Rectangular
Square
Trapezoidal
According to Francis formula, the discharge over a rectangular weir is (where n = Number of end contractions)
(2/3) × Cd (L - nH) × √(2gh)
(2/3) × Cd (L - 0.1nH) × √(2g) × H3/2
(2/3) × Cd (L - nH) × √(2g) × H²
(2/3) × Cd (L - nH) × √(2g) × H5/2
For a floating body to be in stable equilibrium, its metacentre should be
Below the center of gravity
Below the center of buoyancy
Above the center of buoyancy
Above the center of gravity
A hemispherical tank of radius (R) has an orifice of cross-sectional area (a) at its bottom and is full of liquid. The time required to empty the tank completely is
14π R1/2/15Cd × a √(2g)
14π R3/2/15Cd × a √(2g)
14π R5/2/15Cd × a √(2g)
14π R7/2/15Cd × a √(2g)
The celerity (velocity) of a pressure wave in a fluid is given by (where K = Bulk modulus, and ρ = Density of the fluid)
K.ρ
K/ρ
ρ/K
None of these
An ideal flow of any fluid must satisfy
Pascal law
Newton's law of viscosity
Boundary layer theory
Continuity equation
Hydrometer is used to determine
Specific gravity of liquids
Specific gravity of solids
Specific gravity of gases
Relative humidity