3.6 Pressure in liquids and gases [Should do]]

Which statement is true about a liquid? (a)  

• Pressure increases with depth.
• Pressure decreases with depth.
• Pressure does not depend on depth.
• There is no pressure in a liquid.

Which container would have the lowest pressure?

• A cold container with a large amount of gas.

• A cold container with a small amount of gas.

• A hot container with a large amount of gas.

• A hot container with a small amount of gas.

Pressure at a point in a liquid is ​ (a)   in all directions.

• same
• different

Observe the vessels A,B, C, and D shown in figure carefully.

Arrange them in the order of decreasing pressure at the base of each vessel as

​ ​ (a)   >​ (b)   >​ (c)   >​ (d)  

• D
• B
• A
• C

Answer explanation

Liquid pressure increases with depth.

In general, air pressure decreases as the ....................................

(Can choose more than one choice.)

• temperature decreases

• altitude increases

• temperature increases

• altitude decreases

Base on the diagram, choose the correct statements.

• The weight of air above ground is heavier than that at Mt. Everest.

• Air pressure is greatest at the Mt. Everest.

• Gravity pulls the air molecules towards Earth, giving them weight which causes the air pressure.

• Air pressure is highest on the ground.

Air pressure decreases as altitude increases because the concentration of gas particles ​ (a)   and the weight of air above current position ​ (b)   .

• decreases
• increases
• remain the same

The pressure inside the tyre is higher on a hot day as air particles inside the tyre move ​ (a)   at higher temperature, collisions with the inside surface have ​ (b)   force and occur ​ (c)   frequently.

• faster
• more
• slower
• less