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Pressure (O Level)
the air outside the packet is hotter than the air inside the packet.
the air outside is now at a lower pressure than the air inside the packet.
the ultraviolet radiation has increased.
the packet has a small hole that allowed air to leak in.
1.5 : 1
2.0 : 1
2.5 : 1
3.0 : 1
l h Decrease Remain
Changes in atmospheric pressure
Changes in the value of g
Changes in the temperature of mercury
Evaporation of Mercury from the barometer reservoir.
81 cm Hg
76 cm Hg
71 cm Hg
0 cm Hg
Four times its initial pressure
Three times its initial pressure
Reduced to a third of its initial pressure
Reduced to a quarter of its initial pressure
Pressure Speed of Molecules Decrease Increase
5 cm Hg
10 cm Hg
15 cm Hg
20 cm Hg
k cm Hg
d cm Hg
(h - k) cm Hg
(h - d) cm Hg
If the pressure of gases P & Q were equal, the meniscus at Y would move down 8 cm.
The pressure of gas Q is greater than the pressure of gas P by a column of water of height 8 cm.
The pressure of gas P is greater than the pressure of gas Q by a column of water of height 8 cm.
The maximum pressure difference that this manometer can measure is equal to a column of water of height 12 cm.
Po is a vacuum
Po has same pressure as the atmosphere
When the nozzle X is pressured lightly, the liquid level falls because the pressure in Po increases.
If the surrounding atmospheric pressure suddenly decreases, the liquid level will not change.
1 x 10^5 Pa
5 x 10^6 Pa
6 x 10^5 Pa
5 x 10^8 Pa
falls, because air pressure increases with height
falls, because air pressure decreases with height
rises, because air pressure increases with height
rises, because air pressure decreases with height
(x + y) m
(x - y) m
2(x + y) m
(y - x) m
W + Y
Z + X
Z - X
0 mm Hg
150 mm Hg
750 mm Hg
900 mm Hg
the depth of the water
the cross sectional area of the reservoir
density of water
12 cm Hg
64 cm Hg
76 cm Hg
88 cm Hg
Doubled Remains the same
Remains the same Halved
P and R
Q and R
Q and S
P and S
2 cm of water
5 cm of water
10 cm of water
12 cm of water
A ball falling to the ground
Drinking through a straw
The spray from a can cola
Bath water emptying down a plug hole
It is possible that P1 = P2 since A2 > A1 and h1 > h2
P1 < P2 because A2 > A1
P1 > P2 because A2 > A1
P1 > P2 because h1 > h2
Increase the cross sectional area of the limbs
Use another liquid which has a lower density
Use another liquid which has a higher density
Carry out the experiment on a planet which a stronger gravity
10 cm Hg 76 cm Hg
10 cm Hg 86 cm Hg
76 cm Hg 10 cm Hg
76 cm Hg 86 cm Hg
30 cm Hg
60 cm Hg
15 cm Hg
45 cm Hg
Air is introduced into the tube during transfer to the dish.
The capillary effect makes the mercury fill up the tube.
The tube is 600 mm long.
The tube is narrower at the bottom than at the top.
P Q R S
S P Q R
R S P Q
Q R S P
1.060 m of mercury
0.460 m of mercury
0.760 m of mercury
0.300 m of mercury
They each have the same pressure on the base.
The vertical-sided vessels have the greatest pressure on the base.
Vessel (iv) has the least pressure on its base.
Vessel (i) has the greatest pressure on its base.
the liquid in Q is denser than water.
tube P is closer to the gas inlet than tube Q.
there is more liquid in tube Q than in tube P.
the pressure of the gas exerted on P is higher than the pressure of the gas exerted on Q.