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4
The conditions for the stable equilibrium of a floating body are
A. The metacentre should lie above the center of gravity
B. The center of buoyancy and the center of gravity must lie on the same vertical line
C. A righting couple should be formed
D. All the above are correct
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4
Coefficient of resistance is the ratio of
A. Actual velocity of jet at vena-contracta to the theoretical velocity
B. Area of jet at vena-contracta to the area of orifice
C. Loss of head in the orifice to the head of water available at the exit of the orifice
D. Actual discharge through an orifice to the theoretical discharge
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4
A structure used to dam up a stream or river over which the water flows is called
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4
At the center line of a pipe flowing under pressure where the velocity gradient is zero, the shear stress will be
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4
The length of a liquid stream while flowing over a weir __________ at the ends of the sill.
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The mass of 2.5 m3 of a certain liquid is 2 tonnes. Its mass density is
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4
In a free nappe,
A. The pressure below the nappe is atmospheric
B. The pressure below the nappe is negative
C. The pressure above the nappe is atmospheric
D. The pressure above the nappe is negative
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4
In order to increase sensitivity of U-tube manometer, one leg is usually inclined by angle θ. Sensitivity of inclined tube to sensitivity of Utube is equal to
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Falling drops of water become spheres due to the property of
A. Surface tension of water
B. Compressibility of water
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Steady flow occurs when
A. The direction and magnitude of the velocity at all points are identical
B. The velocity of successive fluid particles, at any point, is the same at successive periods of time
C. The magnitude and direction of the velocity do not change from point to point in the fluid
D. The fluid particles move in plane or parallel planes and the streamline patterns are identical in each plane
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4
The specific gravity of an oil whose specific weight is 7.85 kN/m3, is
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4
A model of torpedo is tested in a towing tank at a velocity of 25 m/sec. The prototype is expected to attain a velocity of 5 m/sec. What model scale has been used?
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4
In a broad-crested weir, the discharge is maximum if the head of water on the downstream side of weir is __________ the head of water on the upstream side of weir.
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4
The Francis formula for the discharge over Cipoletti weir is
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4
The viscosity of water at 20°C is
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4
Uniform flow occurs when
B. The flow is streamline
C. Size and shape of the cross section in a particular length remain constant
D. Size and cross section change uniformly along length
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A weir is said to be broad crested weir, if the width of the crest of the weir is ________ half the height of water above the weir crest.
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The atmospheric pressure at sea level is
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The dynamic viscosity of the liquid __________ with rise in temperature.
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The discharge over the trapezoidal notch is equal to the discharge over the rectangular notch __________ the discharge over the triangular notch.
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4
A flow through a long pipe at constant rate is called
B. Steady non-uniform flow
D. Unsteady non-uniform flow
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4
The coefficient of viscosity may be determined by
B. Orifice type viscometer
C. Rotating cylinder method
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4
If the coefficient of discharge is 0.6, then the discharge over a right angled notch is
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4
Fluid is a substance which offers no resistance to change of
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4
Center of pressure compared to e.g. is
D. Above or below depending on area of body
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A flow in which the quantity of liquid flowing per second is not constant, is called
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4
When a cylindrical vessel, containing some liquid, is rotated about its vertical axis, the liquid surface is depressed down at the axis of its rotation and rises up near the walls of the vessel on all sides. This type of flow is known as
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4
The value of coefficient of velocity for a sharp edged orifice __________ with the head of water.
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In an external mouthpiece, the absolute pressure head at vena contracta is __________ the atmospheric pressure head by an amount equal to 0.89 times the height of the liquid, above the vena contracta.
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If 850 kg liquid occupies volume of one cubic meter, men 0.85 represents its