Q6 of 17 Page 236

By observing the diagram, answer the following.

a) How does the pressure at A differ from the pressure at B.?


b) The pressure at B is greater than the pressure at D. Is it true?. Justify your answer.


c) Compare the pressure at A and C.


d) If the water is replaced with mercury, how would this affect the pressure at A and D?


a) The pressure at B is greater than the pressure at A.

Pressure (P) is defined as the force (F) acting per unit area(A).



As the pressure depends upon the force i.e. the weight of the water column above the given point, so the pressure at B is greater than the pressure at A.



b) No.


Pressure is the same at two points at the same level, as point B and point D are at a same level so their pressure is also the same.


c) Same.


Though the point A and point C are in different vessels, they are at the same level. So, the pressure is the same as point A and point C.


d) Pressure at point D will be greater than point A.


As the height of the mercury column above the given point is greater than at point D than at point A, so the pressure at point D will be greater than at point A.


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We know Pressure = Force / Area

If 50 N force is applied on a liquid and it experiences 25 N/m2 pressure.


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Aswin and Anwar were playing with four bricks each. Aswin arranged his four bricks as shown in figure A. Anwar arranged his bricks as shown in figure B, in order to be a taller one.

Now let us complete the following sentences by choosing the right option below


(equal to, less than, more than)



a) The force of A on the ground is _________ the force of B on the ground.


b) The area that A occupies is ________ B on the ground.


c) The pressure exerted by A is _______ the pressure exerted by B.