Specific weight of sea water is more than that of pure water because of dissolve

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Question
Specific weight of sea water is more than that of pure water because of
Options
A. dissolved air
B. dissolved salts
C. suspended matter
D. all the above.

Correct Answer

all the above.

Hydraulics problems

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3. The flow is called rotational if its velocity normal to the plane of area is equal to
Options
A. angular velocity vector
B. twice the angular velocity vector
C. thrice the angular velocity vector
D. none of these.

4. Hydraulic grade line
Options
A. remains above the centre line of conduit
B. remains below the centre line of conduit
C. remains parallel to the centre line of conduit
D. may be above or below the centre line of conduit.

6. On a flow net diagram, the distance between two consecutive steam lines at two successive sections are 1 cm and 0.5 cm respectively. If the velocity at the first section is 1 m/sec, the velocity at the second is
Options
A. 1.0 m/sec
B. 0.5 m/sec
C. 2.0 m/sec
D. 2.5 m/sec
E. 3 m/sec.

7. Discharge with velocity of approach, over a rectangular weir is
Options
A. C_d x L x 2g [(H + ha)^3/2 + ha^3/2]
B. C_d x L x 2g [(H + ha)^3/2 - ha^3/2]
C. C_d x L x 2g [(H - ha)^3/2 + ha^3/2]
D. C_d x L x 2g [(H - ha)^3/2 - ha^3/2]

8. Hydraulic radius is equal to
Options
A. area divided by the square of wetted perimeter
B. area divided by wetted perimeter
C. wetted perimeter divided by area
D. square root of the area.

10. Pick up the correct statement from the following :
Options
A. Dimensional homogeneity means the dimensions of each term in an equation on both sides are equal
B. Dimensionally homogeneous equations are independent of the system of units
C. In dimensionally homogeneous equation, the powers of fundamental dimensions on either side of the equation are identical
D. All the above.

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