Physics-
General
Easy
Question
A horizontal tube has different cross-section at two points A and B The diameters of the tube at points A and B are 4 cm and 2 cm respectively. The two manometers arms are fixed at points A and B. When a liquid of density 
flows through the tube, the difference of pressure between the arms of manometer is 8 cm. Calculate the rate of flow of liquid nearly, deriving the necessary formula 
The correct answer is:
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Figure shows how the stream of water emerging from a faucet "necks down" as it falls. Figure shows two levels separated by a vertical distance h. The cross-sectional areas 
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Two capillary tubes of equal length and inner radii 2r and 4r respectively are added in series and a liquid flows through it. If the pressure difference between the ends of the whole system is 8.5 cm of mercury, find the pressure difference between the two ends of the first capillary tube.
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In a surface tension experiment, the lower end of a capillary tube of radius r is placed vertically in water. It is observed that with rise in water heat is evolved. When liquid rises to a height of 2 cm, the angle of contact is zero. If the tube is depressed more now so that the top of the capillary is only 1 cm above the liquid, the angle of contact changes. If the same experiment is repeated in an artificial satellite, still water rises. If water rises to height h, the heat evolved is? ( d is the density of water)
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Physics-General
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Consider a small surface area of 
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The capillaries shown in figure have inner radii 0.5 mm,1.0 mm and 1.5 mm respectively. The liquid in the beaker is water. Find the heights of water level in the capillaries. The surface tension of water is 
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The capillaries shown in figure have inner radii 0.5 mm,1.0 mm and 1.5 mm respectively. The liquid in the beaker is water. Find the heights of water level in the capillaries. The surface tension of water is .
Physics-General
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A liquid is contained in a vertical tube of semicircular cross-section. The contact angle is zero. The force of surface tension on the curved part and on the flat part are in ratio
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is filled with a liquid. A thin wire of mass per unit length 
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Physics-General
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A light open rigid wire frame floats on the surface of water as shown in fig. What force will act on the frame due to surface, immediately after some soap solution is dropped inside it 
and 
are the surface tensions of water and soap solutions respectively 
.
A light open rigid wire frame floats on the surface of water as shown in fig. What force will act on the frame due to surface, immediately after some soap solution is dropped inside it and are the surface tensions of water and soap solutions respectively .
Physics-General
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A soap bubble has radius R and thickness d(<<R) as shown. It collapses into a spherical drop. The ratio of excess pressure in the drop to the excess pressure inside the bubble is
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Physics-General
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A liquid is filled in a spherical container of radius R till a height h. At this positions the liquid surface at the edges is also horizontal. The contact angle is
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Physics-General
Physics-
A uniform rod of density , and length 'l' is having square cross-section of side 'a'. It is placed in a liquid of equal density vertically along length in a tank having sufficient height of liquid. The surface tension of liquid is 'T' and angle of contact is 120° Then :
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Physics-General
Chemistry-
The number of atoms in 100 g of an fcc crystal with density d = 10 g 1 cm3 and cell edge as 200 pm is equal to:
The number of atoms in 100 g of an fcc crystal with density d = 10 g 1 cm3 and cell edge as 200 pm is equal to:
Chemistry-General
