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
विकल्प
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
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?
For a given thrust, pressure is more on a surface of large j area.
A man exerts same pressure on the ground whether he is standing or he is lying.
Name two factors on which the pressure on a surface depends.
A sharp pin works better than a blunt pin. Explain the reason.
Calculate the pressure in pascal exerted by a force of 300 N acting normally on an area of 30 cm2.
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.
Consider the statement given below and choose the correct option.
Assertion: Broad straps are used in bags.
Reason: Broad straps last for long.
An empty plastic bottle closed with an airtight stopper is pushed down into a bucket filled with water. As the bottle is pushed down, there is an increasing force on the bottom. This is because
Pressure can be increased by decreasing the force.
Assertion: The pressure at the bottom of the sea is lesser than that near the surface.
Reason: The pressure exerted by a liquid depends upon the depth of the liquid and density of the liquid.
What is thrust?
Give reasons why:
cutting edges of knives and axes are sharpened.
Intermolecular forces are stronger in ______.
The shape and size of the solids do not easily change.
What is the SI unit of pressure?
Assertion (A): Wide wooden sleepers are kept below railway lines to reduce pressure on the railway tracks and prevent them from sinking into the ground.
Reason (R): Pressure is directly proportional to the area in which it is acting.
The force exerted by liquid perpendicular to the surface of the body is equal to the product of ______ at that point.
Iceberg floats in water with part of it submerged. What is the fraction of the volume of iceberg submerged if the density of ice is ρi = 0.917 g cm–3?
