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# Fluid Mechanics MCQ Book solution Quiz 02

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#### The increase in metacentric height 1. Increases stability 2. Decreases stability 3. Increases comfort for passengers 4. Decreases comfort for passengers Correct answer is

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By increasing metacentric height it's oscillation time period reduces, which is uncomfortable for passengers.

#### A rectangular Block 2 metre long 1 metre wide and 1 metre deep float in water, the depth of immersion being 0.5m. If water weight 10 kN/m3, then the weight of the block is

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weight of block = weight of water displaced w = 2x1x0.5x10 = 10 kN

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#### When a liquid rotates at a constant angular velocity about a vertical Axis as a rigid body, the pressure intensity varies

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Vortex flow: As the flow of fluid along a curved path over the flow of a rotating mass of fluid is known as vertex flow. P is directly proportional to square of radial distance

#### An open cubical tank of 2m side is filled with water. If the tank is rotated with an acceleration such that half of the water spills out, then the acceleration is equal to

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tanθ = a/g if half spills out then θ = 45 1 = a/g a = g

#### A right circular cylinder open at the top is filled with liquid and rotated about its vertical axis at such a speed that half the liquid spills out, then the pressure intensity at the centre of bottom is

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Half Volume = 1/2πR2h Volume of parabola = 1/2πR2H h = H by equating both ∂P/∂h = w & ∂P/∂r = pv2/r both will be zero

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