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7.

An open tank contains 1 m deep water with 50 cm depth of oil of specific gravity 0.8 above it. The intensity of pressure at the bottom of tank will be                        
A. 4 kN/m2 B. 10 kN/m2
C. 12 kN/m2 D. 14 kN/m2



8.

The position of center of pressure on a plane surface immersed vertically in a static mass of fluid is                        
A. at the centroid of the submerged area B. always above the centroid of the area
C. always below the centroid of the area D. none of the above



9.

The total pressure on a plane surface inclined at an angle 9 with the horizontal is equal to
where p is pressure intensity at centroid of area and A is area of plane surface.                        
A. PA B. pA sin 9
C. pA cos 9 D. pA tan 9




10.

A vertical rectangular plane surface is submerged in water such that its top and bottom surfaces are 1.5 m and 6.0 m res-pectively below the free surface. The position of center of pressure below the free surface will be at a distance of                        
A. 3.75 m B. 4.0 m
C. 4.2m D. 4.5m



11.

Centre of buoyancy always                        
A. coincides with the centre of gravity B. coincides with the centroid of the volume of fluid displaced
C. remains above the centre of gravity D. remains below the centre of gravity



12.

If the weight of a body immersed in a fluid exceeds the buoyant force, then the body will                        
A. rise until its weight equals the buoyant force B. tend to move downward and it may finally sink
C. float D. none of the above



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