Pressure

Q.

The force required to stretch a steel wire of $1c{m}^2$ cross - section to 1.1 times its length would be $(Y=2\times {10}^{11}N{m}^{-2})$

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Q. A certain block weighs 15N in air , 12N in water. When immersed in another liquid, it weighs 13N. Calculate the relative density of:- (i)the block (ii)the other liquid

Q. An open and wide glass tube is immersed vertically in mercury in such a way that length 0.05m extends above mercury level.the open end of the tube is closed and the tube is raised further by 0.43 m.the length of air column above mercury level in the tube will be.patm=76cm of Hg

Q. a force F is applied on a square area of side L. if the percentage error in the measurement of L 2% and that in F is 4% what is the maximum percentage error in pressure

Q.

The pressure at the bottom of a tank containing a liquid does not depend on

1. Acceleration due to gravity

2. Height of the liquid column

3. Area of the bottom surface

4. Nature of the liquid

Q.

A glass rod of radius 1mm is inserted symmetrically into a glass capillary tube with inside radius 2mm Then the whole arrangement is brought in contact with the surface of water.Surface tension of water is $7\times {10}^{-2}N/m$.To what height will water rise in the capillary $(\theta =0^o)$

1. 4.2 cm

2. 2.1cm

3. 6.8cm

4. 1.4 cm

Q. Explain why (a) The blood pressure in humans is greater at the feet than at the brain (b) Atmospheric pressure at a height of about 6 km decreases to nearly half of its value at the sea level, though the height of the atmosphere is more than 100 km (c) Hydrostatic pressure is a scalar quantity even though pressure is force divided by area.

Q.

A tank 5 m high is half filled with water and then is filled to the top with oil of density $0.85g/c{m}^3$. The pressure at the bottom of the tank, due to these liquids is

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Q. A metal cube is placed in an empty vessel. When water is filled in vessel so that the cube is completely immersed in the water, the force on the bottom of the vessel in contact with the cube will remain same. Why

Q. Viscous force acting on a body is given byF=6πηrv here r is radius v is velocity.Obtain the dimension of coefficient of viscosity​ η.

Q. 28. A solid floats in water with 3/4 of its volume below the surface of water. Calculate the density of the solid.

Q. A tank with a square base of area 1.0 m² is divided by a vertical partition in the middle. The bottom of the partition has a small-hinged door of area 20 cm². The tank is filled with water in one compartment, and an acid (of relative density 1.7) in the other, both to a height of 4.0 m. compute the force necessary to keep the door close.

Q.

A capillary tube of radius r is dipped in a liquid of density d and surface tension S. If the angle of contact is θ, the pressure difference between the two surfaces in the beaker and the capillary is

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Q. if pressure at the half depth of lake is equal to 3/4 times the pressure at its bottom then find the depth of lake

Q. A body float with 1/3 of its volume outside water and 3/4 of its volume outside another liquid. the density of another liquid is

Q. A wooden block of mass 8 kg is tied to a string attached to the bottom of a tank. The block is completely inside the water. The tension in string is Relative density of wood is 0.8 and g 10 m/s2)

Q.

Terminal velocity of a spherical body of density ρ and radius r moving through a liquid of density ρ’ is given by

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Q. 38.Two closed containers of equal volume filled with air at pressure Po and temperature To.Both are connected by a narrow tube. If one of the container is maintained at temperature T, then new pressure in the containers will be

Q. A vertical off-shore structure is built to withstand a maximum stress of 10⁹ Pa. Is the structure suitable for putting up on top of an oil well in the ocean ? Take the depth of the ocean to be roughly 3 km, and ignore ocean currents.

Q.

A tank containing water has an orifice on one vertical wall. If the centre of the orifice is 5 m below the surface of water in the tank, the velocity of discharge is (take g = 9.8 m/s²)

1. 9 m/s

2. 10 m/s

3. 9.5 m/s

4. 9.9 m/s

Q. Anvils made of single crystals of diamond, with the shape as shown in Fig. 9.14, are used to investigate behaviour of materials under very high pressures. Flat faces at the narrow end of the anvil have a diameter of 0.50 mm, and the wide ends are subjected to a compressional force of 50, 000 N. What is the pressure at the tip of the anvil

Q. 58. A container has two immiscible liquids of densities rho1 and rho2 .a capilary tube of radius r is inserted in the liquid so that its bottom reaches upto the denser liquid. The denser liquid rises in the capilary and attains a hight h from the interface of the liquids which is equal to the column of the lighter liquid .assuming angle of contact to be 0, the surface tension of the heavier liquid is

Q. 38. A fixed container of height H with large cross section area A is completely filled with water . Two small orifice of area a are made, one at the bottom and the other on the vertical side of the container at a distance H/2 from the top of the container. Find the time taken by the water level to reach a height of H/2 from th

Q.

If pressure at half the depth of a lake is equal to 2/3 pressure at the bottom of the lake then what is the depth of the lake

1. 10 m

2. 60 m

3. 30 m

4. 20 m

Q. 156.The same horizontal force is applied to objects of different mass. Which of the graph is correct of a-m in given experiment.

Q.

What are thrust and pressure?

Q. The percentage change in pressure at a given temparature is 200% increase.calculate the percentage change in the volume of the gas

Q. A cubical blick of side 1 m of specific gravity K(K>1) is placed at the bottom of a vessel containing water. Normal force ( in Newton) by the stands of the vessel on the block is

Q. 4.To what height a cylindrical vessel be filled with a homogeneous liquid to make to force on bottom equal to force of side? [R=radius of the vessel] A. 2R B. R C. R/2 D. 4R Click here to view details:

Q. Statement 1: Pressure is a vector quantity as it has a direction.

Statement 2: Pressure is a Scalar Quantity.

1. Both are correct

2. Statement 1 is correct and 2 is incorrect

3. Statement 1 is incorrect and 2 is correct

4. Both are incorrect