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The heart of a man pumps 5 litres of blood through the arteries per minute at a pressure of 150 mm of mercury. If the density of mercury be
then the power of heart in watt is:
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- 1)
When an empty bottle is closed air tight and pushed inside water it bounces back when it is released. This is because _______.
- 2)When objects are immersed in a fluid, they experience which of the following forces?
- 3)
A barometer is constructed using a liquid (density =760kg/m³). What would be the height of the liquid column, when a mercury barometer reads 76cm ?
(Density of mercury =13600kg/m³) - 4)
A liquid does not wet the solid surface if angle of contact is
- 5)A thin flat circular disc of radius 4.5 cm is placed gently over the surface of water. If surface tension of water is
then the excess force required to take it away from the surface is:
- 6)The velocity of a small ball of mass M and density d, when dropped in a container filled with glycerin becomes constant after some time. If the density of glycerin is d/2 , then the viscous force acting on the ball will be:
- 7)If a soap bubble expands, the pressure inside the bubble
- 8)A soap bubble, having radius of 1 mm, is blown from a detergent solution having a surface
tension of
The pressure inside the bubble equals at a
below the free surface of water in a container.
is:
- 9)A certain number of spherical drops of a liquid of radius 'r' coalesce to form a single drop of radius 'R' and volume 'V'. If 'T' is the surface tension of the liquid, then:
- 10)Two non-mixing liquids of densities ρ and nρ(n > 1) are put in a container. The height of each liquid is h. A solid cylinder of length L and density d is put in this container. The cylinder floats with its axis vertical and length pL(p < 1) in the denser liquid. The density d is equal to:
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