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1. Multiple Choice Questions (MCQs):
Which statement is true about liquid pressure?
i. Pressure is directly proportional to the density of liquid.
ii. Pressure is inversely proportional to density of liquid.
iii. Pressure is inversely proportional to the depth of liquid.
iv. Pressure is directly proportional to the height of liquid.
b. Which is the unit of pressure?
i. Pascal
ii. newton
iii. mm of Hg
iv. joule
c. For what purpose is the foundation of a building made wider than its w
i. to increase pressure on the wall
iii. to resist pressure of the wall
ii. to decrease pressure on the val
iv. for both ii and iii
d. Which statement is true about mercury barometer?
i. Filling mercury makes the instrument convenient to use.
ii. A vacuum is left in the glass tube while filling mercury in the tube
iii. Increasing level of mercury in the tube shows fall in atmospheric pressu
iv. Mercury level will rise if it is taken from Lumbini to Mount Machhapuch
180 MODERN GRADED SCIENCE AND TECHNOLOGY CLASS-8
J.



Answer :

GinnyAnswer

Final answer:

Liquid pressure, unit of pressure, foundation stability, and mercury barometer explained.


Explanation:

Liquid pressure: Liquid pressure is directly proportional to the density of the liquid and the height of the liquid but inversely proportional to the depth of the liquid.

Unit of pressure: The unit of pressure is the Pascal (Pa), which is the SI unit used to measure pressure.

Foundation of a building: The foundation is made wider than its walls to resist the pressure of the walls pressing down on it to provide stability and prevent collapse.

Mercury barometer: A vacuum is indeed left in the glass tube while filling mercury in the tube, and the increasing level of mercury in the tube indicates a rise in atmospheric pressure, not a fall.


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