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Air Pressure and Wind Formation

Air Exerts Pressure

Question 1mcq
Which observation best shows that air exerts pressure?
A.A pressed rubber sucker sticks to a smooth wall.
B.A stone sinks in water.
C.Sugar dissolves in tea.
D.Iron rusts in moist air.
Question 2mcq
When air is removed from a sealed tin can and the outside air pushes it inward, what does this show?
A.Air has no effect on objects.
B.Air outside exerts pressure.
C.Only liquids can exert pressure.
D.Pressure is produced only by magnets.
Question 3mcq
Why does a balloon expand when more air is blown into it?
A.Air destroys the rubber chemically.
B.Air has no pressure inside a balloon.
C.Air inside pushes on the rubber surface.
D.Only the balloon colour causes expansion.
Question 4mcq
A student says, “Air cannot push because we cannot see it.” What is the best correction?
A.Only visible things can exert force.
B.Air is always absent indoors.
C.Pressure happens only inside solids.
D.Invisible air can still exert pressure and produce observable effects.
Question 5mcq
If a syringe nozzle is closed and the plunger is pushed, it becomes harder to push. Why?
A.Compressed air inside pushes back with greater pressure.
B.Air disappears from the syringe.
C.The plastic turns into metal.
D.The plunger becomes magnetic.

How Winds Form

Question 6mcq
Wind is mainly caused by:
A.Movement of rocks from mountains to seas
B.Movement of air from high pressure to low pressure
C.Neutralisation between acids and bases
D.Photosynthesis in leaves only
Question 7mcq
What usually happens to warm air near the ground?
A.It always sinks immediately.
B.It turns into soil.
C.It rises because it becomes lighter than surrounding cooler air.
D.It stops exerting pressure completely.
Question 8mcq
A candle flame near a doorway bends inward toward a warm room at the bottom. What does this suggest?
A.Air never moves through doors.
B.The flame is measuring rainfall.
C.Warm air always sinks at the bottom.
D.Cooler air is moving in to replace rising warm air.
Question 9mcq
Which sequence correctly explains wind formation?
A.Uneven heating ightarrow ightarrow pressure difference ightarrow ightarrow air movement
B.Air movement ightarrow ightarrow no pressure ightarrow ightarrow no heating
C.Rainfall ightarrow ightarrow rusting ightarrow ightarrow wind stops
D.Photosynthesis ightarrow ightarrow salt formation ightarrow ightarrow cyclone
Question 10mcq
If two nearby places are heated equally, the wind between them is likely to be weak because:
A.air pressure becomes a solid.
B.the pressure difference is small.
C.cool air cannot move at all.
D.the Sun stops heating Earth.