Tag: pressure in fluids and atmospheric pressure

Questions Related to pressure in fluids and atmospheric pressure

The working of hydraulic brakes is based on $Pascal's \ law.$

physics pressure in fluids and atmospheric pressure hydraulic equipment applications of pascals law examples of hydraulic press

  1. True

  2. False

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Correct Option: A
Explanation:

hydraulic brakes are based on the pascal`s law and is used for amplifying the applied force to a given extent .

therfore option (A) is correct

.......................... is used to lift or support heavy objects and work on Pascal's law.

physics pressure in fluids and atmospheric pressure hydraulic equipment applications of pascals law examples of hydraulic press

  1. Hydraulic lift

  2. Hydraulic press

  3. Hydraulic brake

  4. All

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Correct Option: A
Explanation:

A hydraulic lift is used to lift or support heavy objects. It consists of two pistons of variying cross sectional areas.

A mechanical machine which is used to lift or compress large loads.

physics pressure in fluids and atmospheric pressure hydraulic equipment applications of pascals law examples of hydraulic press

  1. hydraulic press

  2. hydraulic lifts

  3. hydraulic brakes

  4. none

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Correct Option: A
Explanation:

A hydraulic press is a mechanical machine used to lift or compress large loads. A hydraulic press consist of two cylinders $C _1$ and $C _2$, fitted with pistons, valves and tubes.

................ works on the Pascal's law and is used in automobiles.

physics pressure in fluids and atmospheric pressure hydraulic equipment applications of pascals law examples of hydraulic press

  1. Hydraulic press

  2. Hydraulic lift

  3. Hydraulic jack

  4. All

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Correct Option: C
Explanation:

Hydraulic brake confirms to Pascal's law and is used in automobiles. It consist of a master cylinder filled with brake oil and provided with an airtight frictionless piston.

The pump tube of hydraulic press is of cross section area $a$ and is connected with a press tube of cross section area $A$ such that :

physics pressure in fluids and atmospheric pressure hydraulic equipment applications of pascals law examples of hydraulic press

  1. $a>A$

  2. $A>a$

  3. $A=a$

  4. None of the above

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Correct Option: B
Explanation:

In the construction of hydraulic press, release valve and press foot valves are there.

Hydraulic press consist of a pump tube of cross sectional area $a$ connected with a press tube of cross sectional area $A$ such that $A>a$.
The lower end of the pump tube is connected with a smaller tube which is further connected with an underground water tank.
At the junction of the pump tube and the smaller tube is fitted $a$ "pump foot valve" which opens in the upward direction only.

Discharge of centrifugal pump is

physics pressure in fluids and atmospheric pressure hydraulic equipment applications of pascals law examples of hydraulic press

  1. inversely proportional to diameter of its impeller

  2. inversely proportional to $diameter^2$ of its impeller

  3. directly proportional to (diameter)2 of its impeller

  4. directly proportional to diameter of its impeller

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Correct Option: B
Explanation:

Discharge of centrifugal pump is inversely proportional to square of the diameter of its impeller, thus option B is correct.

Hydraulic jacks works on which principle from below?

physics pressure in fluids and atmospheric pressure hydraulic equipment applications of pascals law examples of hydraulic press

  1. the pressure in closed container is the same at all points

  2. the pressure in closed container is not same at all points

  3. the pressure in closed container is opposite at all points

  4. None

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Correct Option: A
Explanation:

Hydraulic jacks works on the Pascal's law that the pressure in closed container is the same at all points.

Power required to drive a centrifugal pump is directly proportional to __________ of its impeller.

physics pressure in fluids and atmospheric pressure hydraulic equipment applications of pascals law examples of hydraulic press

  1. Cube of diameter

  2. Fourth power of diameter

  3. Square of diameter

  4. Diameter

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Correct Option: B
Explanation:

Power required to drive a centrifugal pump is directly proportional to the fourth power of the diameter of its propeller.

$\therefore$  Power     $P \propto  D^4$

The greater the differences in the areas of the cylinders, the greater the           force output of the big cylinder for hydraulic jack. Fill in the gap

physics pressure in fluids and atmospheric pressure hydraulic equipment applications of pascals law examples of hydraulic press

  1. Potential

  2. Kinetic

  3. Rotational

  4. Dynamic

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Correct Option: A
Explanation:

According to the Pascal's law       $\dfrac{F _1}{A _1} = \dfrac{F _2}{A _2}$
$\implies$   Greater the difference in the areas of the cylinder , greater is the force potential output of the big cylinder for hydraulic jacks.

The center of pressure of surface subjected to fluid pressure is the point

physics pressure in fluids and atmospheric pressure hydraulic equipment applications of pascals law examples of hydraulic press

  1. on the surface at which resultant pressure acts

  2. on the surface at which gravitational force acts

  3. equal to volume of liquid displaced

  4. none

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Correct Option: B
Explanation:

The center of pressure of surface subjected to fluid pressure is the point on the surface at which gravitational force acts