Tag: pressure in fluids and atmospheric pressure

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Questions Related to pressure in fluids and atmospheric pressure

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

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

  1. hydraulic press

  2. hydraulic lifts

  3. hydraulic brakes

  4. none
Reveal answer Fill a bubble to check yourself
A Correct answer
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.

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

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

  1. Hydraulic press

  2. Hydraulic lift

  3. Hydraulic jack

  4. All
Reveal answer Fill a bubble to check yourself
C Correct answer
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.

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

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 :

  1. $a>A$
  2. $A>a$
  3. $A=a$

  4. None of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
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.

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

Discharge of centrifugal pump is

  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
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

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

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

Hydraulic jacks works on which principle from below?

  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
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

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

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

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

  1. Cube of diameter

  2. Fourth power of diameter

  3. Square of diameter

  4. Diameter
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

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

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

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

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

  1. Potential

  2. Kinetic

  3. Rotational

  4. Dynamic
Reveal answer Fill a bubble to check yourself
A Correct answer
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.

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

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

  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
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

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