Advertisements
Advertisements
प्रश्न
A beaker containing a liquid is kept inside a big closed jar. If the air inside the jar is continuously pumped out, the pressure in the liquid near the bottom of the liquid will
पर्याय
increase
decrease
remain constant
first decrease and then increase
Advertisements
उत्तर
decrease
As the air inside the jar is pumped out, the air pressure decreases. Thus, the pressure in the liquid near the bottom of the beaker decreases.
APPEARS IN
संबंधित प्रश्न
Explain why Hydrostatic pressure is a scalar quantity even though the pressure is force divided by area.
Two vessels have the same base area but different shapes. The first vessel takes twice the volume of water that the second vessel requires to fill up to a particular common height. Is the force exerted by the water on the base of the vessel the same in the two cases? If so, why do the vessels filled with water to that same height give different readings on a weighing scale?
It is easier to hammer a blunt nail into a piece of wood than a sharply pointed nail.
Water in a lake exerts pressure only at its bottom.
Name two factors on which the pressure on a surface depends.
When does a man exert more pressure on the floor: while standing or while walking?
Why do camels or elephants have broad feet?
A sharp pin works better than a blunt pin. Explain the reason.
Find the pressure 200m below the surface of the ocean if pressure on the free surface of liquid is one atmosphere. (Density of seawater = 1060 kg/m3)
In a hydraulic lift, the input piston had surface area 30 cm2 and the output piston has surface area of 1500 cm2. If a force of 25 N is applied to the input piston, calculate weight/force on output piston.
Match the following.
| 1. | Density | hρg |
| 2. | 1 gwt | Milk |
| 3. | Pascal’s law | `"Mass"/" Volume"` |
| 4. | Pressure exerted by a fluid | Pressure |
| 5. | Lactometer | 980 dyne |

A water tank has four taps fixed at points A, B, C, D as shown in the following figure. The water will flow out at the same pressure from taps at
At higher altitudes, atmospheric pressure is ______.
What is thrust?
Explain why the cutting instruments are sharpened.
Fluids in general are ______.
Upthrust = weight of the fluid displaced – apparent weight of the object.
Assertion (A): A sleeping mattress is so designed that when you lie on it, a large area of your body comes in its contact.
Reason (R): This reduces the pressure on the body and sleeping becomes comfortable.
The force exerted by liquid perpendicular to the surface of the body is equal to the product of ______ at that point.
