Advertisements
Advertisements
Question
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
Options
increase
decrease
remain constant
first decrease and then increase
Advertisements
Solution
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
RELATED QUESTIONS
Toricelli’s barometer used mercury. Pascal duplicated it using French wine of density 984 kg m–3. Determine the height of the wine column for normal atmospheric pressure.
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?
A plane is in level flight at a constant speed and each of its two wings has an area of 25 m2. If the speed of the air is 180 km/h over the lower wing and 234 km/h over the upper wing surface, determine the plane’s mass. (Take air density to be 1 kg m–3).
The pressure on a surface increases with an increase in the thrust on the surface.
It is easier to hammer a blunt nail into a piece of wood than a sharply pointed nail.
The S.I. unit of pressure is pascal.
Water in a lake exerts pressure only at its bottom.
The unit of thrust is
It is easier to cut with a sharp knife than with a blunt one. Explain.
A normal force of 200 N acts on an area of 0.02 m2. Find the pressure in pascal.
Consider the situation of the previous problem. Let the water push the left wall by a force F1 and the right wall by a force F2.
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)
An air bubble of radius 0.2 mm is situated just below the water surface. Calculate the gauge pressure. Surface tension of water = 7.2 × 10−2 N/m.
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
The total force exerted by a body normal to the surface is called ______.
Pressure is directly proportional to the area of contact.
Explain the variation of the pressure exerted by liquid with respect to the following factors.
- Amount of liquid
- Depth
- Shape and size of the container
Give reasons why:
heavy trucks are fitted with 6 to 8 wheels
What is the SI unit of pressure?
What happens when pressure is increased in solids?
