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Water is flowing through a pipe under constant pressure. At some place the pipe becomes narrow. The pressure of water at this place:

According to Bernoulli's theorem P/ρ + ½v² = Constant. At narrow end, velocity increases and hence pressure decreases.... View Article

When the velocity of liquids exceed the critical velocity then

When the velocity of liquids exceeds the critical velocity, then streamline flow becomes turbulent.... View Article

Blood is flowing at the rate of 200 cm3/s in a capillary of cross-section area 0.5 m2 . The velocity of flow is mm/s is

From the equation of continuity (av = constant), we have 0.5 V = 200 X 10-6 V = 4 X 10-4 m/s V = 0.4 mm/s.... View Article

The equation of continuity is a special case of the law of conservation of

For the pipe of varying cross-section, the mass of liquid flowing out equals the mass flowing in. This follows the law of conservation of mass.... View Article

A body of mass m rises to a height h = R/5 from the earth’s surface where R is earth’s radius. If g is acceleration due to gravity , the increase in PE is

Increase in PE = mgR2 [ 1/R – 1/( R + h)] Put R = 5h Incr. in PE = 5mgh/6... View Article

Range of Reynold’s number for the laminar flow of a liquid is

For laminar flow, Reynold's number lies between zero to 1000.... View Article

Which of the following statement is not related to conservative force?

Path dependent force is a non-conservative force.... View Article

Frictional force is an example of

The frictional force is a non-conservative force. The non-conservative force depends on the path that is taken between the initial and final... View Article

A force which does not depend on the path taken to increase the potential energy is

A force which does not depend on the path taken to increase the potential energy is a conservative force. Frictional and viscous forces are... View Article

In the streamlined flow of a liquid, the power due to pressure difference between the ends of the tube is (1) Equal to a product of pressure and volume of liquid flowing per second (2) Equal to a product of pressure and mass of liquid flowing per second (3) Equal to the product of radius and coefficient of viscosity (4) Equal to the product of pressure and velocity.

Answer: (1) Equal to a product of pressure and volume of liquid flowing per second Streamline flow in fluids is defined as the flow in which... View Article

The speed of efflux from an open tank is given by a formula identical to that of a:

The speed of efflux from an open tank is given by a formula identical to that of a freely falling body.... View Article

A venturimeter is used to

Venturimeter measures the flow speed of the incompressible fluid. Venturi meter is named after an Italian physicist, Giovanni Battista Venturi.... View Article

Venturimeter is a device based on

A venturi meter is a device which is based on the principle of Bernoulli's equation. Bernoulli's equation states that the total energy of an... View Article

Which of the following assumptions is not considered while arriving at Stoke’s law?

Stoke's law is valid if there is no slip between the body and the fluid layer is in contact with it.... View Article

The minimum pressure require to force the blood of density 1.04 g cm-3 from the heart to the top of the head (vertical distance = 60 cm) is:

According to Bernoulli’s theorem P1- P2 = r g (h2-h1) + ½ r (v22– v12) If v2 = v1, then P1- P2 = r g (h2-h1) = 1.04 x 981 x 60 dyne cm-2... View Article

A straight or curved path, such that tangent to it at any point gives the direction of flow of liquid at that point is known as

A straight or curved path, such that tangent to it at any point gives the direction of flow of liquid at that point is known as streamline flow.... View Article

Evaporation takes place at/in _____. (1) boiling point (2) freezing point (3) between the freezing point and boiling point (4) all temperatures

Answer: (4) all temperatures Evaporation takes place at all temperatures. The air molecules that strike the surface impart some energy to the... View Article

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