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
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
In problem 10.9, if 15.0 cm of water and spirit each are further poured into the respective arms of the tube, what is the difference in the levels of mercury in the two arms? (Specific gravity of mercury = 13.6)
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 S.I. unit of pressure is pascal.
Define the term ‘pressure’ and state its unit.
A gum bottle rests on its base. If it is placed upside down, how does the thrust change?
Consider the statement given below and choose the correct option.
Assertion: Sharp knives are used to cut the vegetables.
Reason: Sharp edges exert more pressure.
Consider the statement given below and choose the correct option.
Assertion: Broad straps are used in bags.
Reason: Broad straps last for long.
In a pressure cooker, the food is cooked faster because ______.
A drinking straw works on the existence of ______.
The total force exerted by a body normal to the surface is called ______.
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:
cutting edges of knives and axes are sharpened.
The pressure in mines is ______ than the sea level.
Hot air is ______ dense than ordinary air.
What is the SI unit of pressure?
What happens when pressure is increased in solids?
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.
Pressure is a scalar quantity because ______.
- it is the ratio of force to area and both force and area are vectors.
- it is the ratio of the magnitude of the force to area.
- it is the ratio of the component of the force normal to the area.
- it does not depend on the size of the area chosen.