**231. The horizontal component of buoyant force is__________________?**

A. negligible

B. same as buoyant force**C. zero**

D. non of these

**232. A body floats in stable equilibrium________________?**

A. when its meatcentric height is zero**B. when the metancentre is above e.g**

C. when its e.g. is below it’s center of buoyancy

D. metacentre has nothing to do with position of e.g. for determining stability

E. none of the above

**233. The total pressure force on a plane area is equal to the area multiplied by the intensity of pressure at the centriod, if __________________?**

A. the area is horizontal

B. the area is vertical

C. the area is inclined**D. all of the above**

E. none of the above

**234. A square surface 3 m x 3 m lies in a vertical line in water pipe its upper edge at vater surface. The hydrostatic force on square surface is __________________?**

A. 9,000 kg**B. 13,500 kg**

C. 18,000 kg

D. 27,000 kg

E. 30,000 kg

**235. 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 _____________________?**

A. 2 meters of water column

B. 3 meters of water column

C. 5 meters of water column**D. 6 meters of water Column**

E. 7 meters of water column

**236. Choose the wrong statement___________________?**

A. The horizontal component of the hydro-static force on any surface is equal to the normal force on the vertical projection of the surface

B. The horizontal component acts through the center of pressure for the vertical projection

C. The vertical component of the hydrostatic force on any surface is equal to the weight of the volume of the liquid above the area**D. he vertical component passes through the center of pressure of the volume**

E. Center of pressure acts at a greater depth than center of gravity

**237. The depth of the center of pressure on a vertical rectangular gate 8 m wide and 6 m high, when the water surface coincides with the top of the gate, is ______________________?**

A. 2.4 m**B. 3.0 m**

C. 4.0 m

D.”2.5 m

E. 5.0 m

**238. Metacentre is the point of intersection of _________________________?**

A. vertical upward force through e.g. of body and center line of body**B. buoyant force and the center line of body**

C. mid point between e.g. and center of buoyancy

D. all of the above

E. none of the above

**239. For a body floating in a liquid the normal pressure exerted by the liquid acts at _________________?**

A. bottom surface of the body

B. e.g. of the body

C. metacentre**D. all points on the surface of the body**

E. all of the above

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

A. the weight of the body

B. more than the weight of the body

C. less than the weight of the body**D. weight of the fluid displaced by the body**

E. weight of body plus the weight of the fluid displaced hy the body