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A ball rises to surface at a constant velocity in liquid whose density is 4 times than that of the material of the ball. The ratio of the force of friction acting on the rising ball and its weight is,

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Important Questions on Fluid Mechanics

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Beta Question Bank for Medical: Physics>Chapter 13 - Fluid Mechanics>Exercise (Analytical Questions)>Q 5
A wooden cube first floats inside water when a 200 g mass is placed on it. When the mass is removed, the cube rises by 2 cm. The side of the cube is
 
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Beta Question Bank for Medical: Physics>Chapter 13 - Fluid Mechanics>Exercise (Analytical Questions)>Q 6
Water stands upto a height h behind the vertical wall of a dam. What is the net horizontal force pushing the dam down by the stream, if width of the dam is σ ? (ρ = density of water)
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Beta Question Bank for Medical: Physics>Chapter 13 - Fluid Mechanics>Exercise (Analytical Questions)>Q 7
A U-tube is partially filled with water. Oil which does not mix with water is next poured into one side until water rises by 25 cm. On the other side, if the density of oil be 0.8, the oil level will stand higher than the water level by,
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Beta Question Bank for Medical: Physics>Chapter 13 - Fluid Mechanics>Exercise (Analytical Questions)>Q 8

A U-tube contains two liquids in static equilibrium: water of density, ρw=1000 kg m-3 is in the right arm, oil of unknown density ρ is in the left arm as shown in figure. Measurements give, l=135 mm and d=12.5 mm. The density of oil is,

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Beta Question Bank for Medical: Physics>Chapter 13 - Fluid Mechanics>Exercise (Analytical Questions)>Q 9
There is a hole in the bottom of the tank having water. If total pressure at the bottom is 3 atm 1 atm=105 N m-1 then the velocity of water flowing from the hole is
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Beta Question Bank for Medical: Physics>Chapter 13 - Fluid Mechanics>Exercise (Analytical Questions)>Q 10
Water is moving with a speed of 5.0 m s-1 through a pipe will cross-sectional area of 4.0 cm2. The water gradually descends 10 m as the pipe increase in area to 8.0 cm2. If the pressure at the upper level is 1.5×105 Pa, the pressure at lower level will be,
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Beta Question Bank for Medical: Physics>Chapter 13 - Fluid Mechanics>Exercise (Assertion & Reason)>Q 1

Assertion: Density of a hollow body is always less than the density of substance of equal mass of the body.

Reason: Volume of a hollow body is greater than the volume of substance of the body but mass of a hollow body is equal to the mass of substance of the body.

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Beta Question Bank for Medical: Physics>Chapter 13 - Fluid Mechanics>Exercise (Assertion & Reason)>Q 3

Assertion: A hydrogen filled balloon stop rising after it has attained a certain height in the sky.

Reason: The atmospheric pressure decreases with height and becomes zero when maximum height is attained.