Pre-med/IB-style questions on pressure, density, hydrostatics, Pascal's principle and hydraulics, buoyancy (Archimedes), atmospheric pressure devices, continuity and Bernoulli flow ideas, viscosity/laminar flow, and surface tension/capillarity. Emphasis on conceptual traps and real-world reasoning.
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src="https://entermedschool.org/embed/questions#{"title":"Fluids and Pressure","questions":[{"prompt":"Pressure is best defined as:","options":[{"label":"A","body":"Force multiplied by area","isCorrect":false},{"label":"B","body":"Force divided by area","isCorrect":true},{"label":"C","body":"Energy divided by time","isCorrect":false},{"label":"D","body":"Charge divided by time","isCorrect":false},{"label":"E","body":"Mass divided by volume","isCorrect":false}],"explanation":"Pressure measures how concentrated a force is: P = F/A. A is wrong (that would have the wrong meaning/units). C is power, D is current, E is density."},{"prompt":"A person stands on snow wearing boots. If they switch to skis (larger contact area) while their weight stays the same, the pressure on the snow:","options":[{"label":"A","body":"Increases","isCorrect":false},{"label":"B","body":"Decreases","isCorrect":true},{"label":"C","body":"Stays the same","isCorrect":false},{"label":"D","body":"Becomes zero","isCorrect":false},{"label":"E","body":"Depends only on snow temperature","isCorrect":false}],"explanation":"With the same force (weight) and larger area, P = F/A decreases. The key idea is pressure changes when area changes, even if force is unchanged."},{"prompt":"A student stands still on one foot instead of two (same weight). Compared with standing on two feet, the pressure on the ground is:","options":[{"label":"A","body":"About half","isCorrect":false},{"label":"B","body":"About double","isCorrect":true},{"label":"C","body":"Unchanged","isCorrect":false},{"label":"D","body":"Zero because there is no motion","isCorrect":false},{"label":"E","body":"Less because balance requires less force","isCorrect":false}],"explanation":"Weight (force) is the same, but contact area is roughly halved, so P = F/A roughly doubles. Motion is irrelevant (D)."},{"prompt":"The SI unit of pressure (pascal, Pa) is equivalent to:","options":[{"label":"A","body":"N·m","isCorrect":false},{"label":"B","body":"N/m","isCorrect":false},{"label":"C","body":"N/m^2","isCorrect":true},{"label":"D","body":"kg/m^2","isCorrect":false},{"label":"E","body":"J/s","isCorrect":false}],"explanation":"Since P = F/A, the unit is N/m². N·m is a joule, and J/s is a watt."},{"prompt":"In a fluid at rest, the pressure at a point acts:","options":[{"label":"A","body":"Only downward","isCorrect":false},{"label":"B","body":"Only upward","isCorrect":false},{"label":"C","body":"Only sideways","isCorrect":false},{"label":"D","body":"Equally in all directions","isCorrect":true},{"label":"E","body":"Only along the direction of flow","isCorrect":false}],"explanation":"In a static fluid, pressure is isotropic: it acts equally in all directions at a point. Directional effects are from pressure differences, not from pressure itself."},{"prompt":"Two points are at the same depth in the same connected body of still water (same surface pressure). The pressure at these two points is:","options":[{"label":"A","body":"Higher at the point directly under the surface center","isCorrect":false},{"label":"B","body":"Higher at the point under the wider part of the container","isCorrect":false},{"label":"C","body":"The same at both points","isCorrect":true},{"label":"D","body":"Higher at the point closer to the wall","isCorrect":false},{"label":"E","body":"Unpredictable without knowing container shape","isCorrect":false}],"explanation":"Hydrostatic pressure depends only on depth (and fluid density and g) when the fluid is at rest: P = P_surface + ρgh. Container shape does not matter."},{"prompt":"Which change would increase the pressure at a point 2 m below the surface of a lake (assuming the lake surface pressure stays atmospheric)?","options":[{"label":"A","body":"Replacing water with a less dense liquid","isCorrect":false},{"label":"B","body":"Decreasing the depth of the point","isCorrect":false},{"label":"C","body":"Replacing water with a more dense liquid","isCorrect":true},{"label":"D","body":"Making the lake wider","isCorrect":false},{"label":"E","body":"Stirring the lake gently","isCorrect":false}],"explanation":"P = P0 + ρgh, so increasing density ρ increases pressure at the same depth. Width and gentle stirring don't change hydrostatic pressure at a given depth."},{"prompt":"A container is filled with water to height h. Which statement about the pressure at the bottom is correct (water at rest, open to atmosphere)?","options":[{"label":"A","body":"It depends on the container's shape","isCorrect":false},{"label":"B","body":"It depends only on the base area","isCorrect":false},{"label":"C","body":"It depends on water height h (and ρ and g), not on shape","isCorrect":true},{"label":"D","body":"It is always equal to atmospheric pressure","isCorrect":false},{"label":"E","body":"It is zero at the bottom","isCorrect":false}],"explanation":"Bottom pressure is P_bottom = P_atm + ρgh. Shape affects total force on the base only via area, but pressure at a given depth depends on height, not shape."},{"prompt":"Two containers have the same water height h but different base areas. Which statement is correct about the FORCE from the water on the base (ignoring the container material)?","options":[{"label":"A","body":"The force is the same because pressure is the same","isCorrect":false},{"label":"B","body":"The container with larger base area has larger force because F = PA","isCorrect":true},{"label":"C","body":"The force is larger in the narrow container because water is \"more concentrated\"","isCorrect":false},{"label":"D","body":"Force depends only on the mass of water, not area","isCorrect":false},{"label":"E","body":"The force must be zero if the water is at rest","isCorrect":false}],"explanation":"At the same depth, pressure P is the same, but force on the base is F = PA. Larger area means larger force even with the same pressure."},{"prompt":"Gauge pressure is best described as:","options":[{"label":"A","body":"Pressure measured relative to vacuum","isCorrect":false},{"label":"B","body":"Pressure measured relative to atmospheric pressure","isCorrect":true},{"label":"C","body":"Pressure measured only in liquids","isCorrect":false},{"label":"D","body":"Pressure that cannot be negative","isCorrect":false},{"label":"E","body":"Pressure multiplied by volume","isCorrect":false}],"explanation":"Gauge pressure uses atmospheric pressure as the zero reference: P_gauge = P_absolute − P_atm. It can be negative if P_absolute < P_atm."},{"prompt":"A tire pressure gauge reads 2.0 bar. This measurement is most likely:","options":[{"label":"A","body":"Absolute pressure inside the tire","isCorrect":false},{"label":"B","body":"Gauge pressure above atmospheric pressure","isCorrect":true},{"label":"C","body":"The pressure at the center of the tire only","isCorrect":false},{"label":"D","body":"The pressure difference between two sides of the tire","isCorrect":false},{"label":"E","body":"The pressure outside the tire","isCorrect":false}],"explanation":"Most tire gauges report pressure above atmospheric pressure (gauge pressure), not absolute pressure. Absolute pressure would be gauge + atmospheric."},{"prompt":"In a U-tube manometer containing the same liquid in both arms, a height difference Δh between the columns indicates that the pressure difference between the two connected points is proportional to:","options":[{"label":"A","body":"Δh only","isCorrect":false},{"label":"B","body":"ρ only","isCorrect":false},{"label":"C","body":"ρgΔh","isCorrect":true},{"label":"D","body":"g/Δh","isCorrect":false},{"label":"E","body":"Δh^2","isCorrect":false}],"explanation":"The hydrostatic pressure difference is ΔP = ρgΔh. Larger density or larger height difference means larger pressure difference."},{"prompt":"If you use a denser manometer liquid (e.g., mercury instead of water) to measure the same pressure difference, the height difference Δh will be:","options":[{"label":"A","body":"Larger","isCorrect":false},{"label":"B","body":"Smaller","isCorrect":true},{"label":"C","body":"The same","isCorrect":false},{"label":"D","body":"Zero","isCorrect":false},{"label":"E","body":"Negative","isCorrect":false}],"explanation":"For fixed ΔP, Δh = ΔP/(ρg). Increasing ρ makes Δh smaller. This is why mercury columns can be relatively short for atmospheric pressure."},{"prompt":"A mercury barometer works because:","options":[{"label":"A","body":"Mercury is magnetic and is pulled upward","isCorrect":false},{"label":"B","body":"Atmospheric pressure pushes on the mercury reservoir and supports a column of mercury","isCorrect":true},{"label":"C","body":"A pump inside the tube pulls mercury up continuously","isCorrect":false},{"label":"D","body":"The vacuum above mercury pulls it upward","isCorrect":false},{"label":"E","body":"Mercury creates its own pressure upward","isCorrect":false}],"explanation":"Atmospheric pressure on the reservoir supports the mercury column. The space at the top is (approximately) a vacuum, so there's no opposing air pressure there."},{"prompt":"Why can you drink through a straw (ignoring viscosity limits)?","options":[{"label":"A","body":"Because you pull the liquid upward with your mouth like a vacuum cleaner","isCorrect":false},{"label":"B","body":"Because you reduce pressure inside the straw and atmospheric pressure pushes the liquid up","isCorrect":true},{"label":"C","body":"Because gravity pulls the liquid up the straw","isCorrect":false},{"label":"D","body":"Because liquids naturally rise in narrow tubes no matter what","isCorrect":false},{"label":"E","body":"Because your mouth adds mass to the liquid","isCorrect":false}],"explanation":"You lower the pressure in the straw; atmospheric pressure on the drink surface pushes liquid up into the region of lower pressure. You don't \"pull\" liquids with suction as a force from your mouth."},{"prompt":"A diver goes deeper in the ocean. The main reason the pressure increases is:","options":[{"label":"A","body":"The diver's mass increases with depth","isCorrect":false},{"label":"B","body":"Water becomes less dense with depth so pressure rises","isCorrect":false},{"label":"C","body":"There is more water above, so the weight of the water column increases pressure","isCorrect":true},{"label":"D","body":"Atmospheric pressure increases underwater","isCorrect":false},{"label":"E","body":"Pressure increases because the diver moves faster","isCorrect":false}],"explanation":"Hydrostatic pressure rises with depth because of the weight of the fluid above: P = P_surface + ρgh. The diver's mass and speed do not set the pressure."},{"prompt":"Two points are at the same depth: one in oil and one in water. Both liquids are open to the same atmospheric pressure. If oil is less dense than water, the pressure at the point in oil is:","options":[{"label":"A","body":"Greater because oil is thicker","isCorrect":false},{"label":"B","body":"The same because depth is the same","isCorrect":false},{"label":"C","body":"Smaller because ρ is smaller in P = P0 + ρgh","isCorrect":true},{"label":"D","body":"Zero because oil floats","isCorrect":false},{"label":"E","body":"Unpredictable without container shapes","isCorrect":false}],"explanation":"At the same depth, the hydrostatic term is ρgh. Lower density means lower pressure increase from the surface pressure."},{"prompt":"Pascal's principle states that:","options":[{"label":"A","body":"Pressure in a moving fluid decreases as speed increases","isCorrect":false},{"label":"B","body":"A pressure change applied to an enclosed fluid is transmitted undiminished throughout the fluid","isCorrect":true},{"label":"C","body":"Buoyant force equals the weight of displaced fluid","isCorrect":false},{"label":"D","body":"Fluid flows from low pressure to high pressure","isCorrect":false},{"label":"E","body":"Pressure depends on container shape","isCorrect":false}],"explanation":"Pascal's principle: in an enclosed (nearly incompressible) fluid at rest, an applied pressure change spreads through the fluid. A is Bernoulli, C is Archimedes."},{"prompt":"A hydraulic lift has a small piston area A1 and a large piston area A2, with A2 > A1. If a force F1 is applied to the small piston, the output force F2 on the large piston (ideal system) is:","options":[{"label":"A","body":"F2 = F1","isCorrect":false},{"label":"B","body":"F2 = F1(A1/A2)","isCorrect":false},{"label":"C","body":"F2 = F1(A2/A1)","isCorrect":true},{"label":"D","body":"F2 = F1 + (A2 − A1)","isCorrect":false},{"label":"E","body":"F2 = F1(A1 + A2)","isCorrect":false}],"explanation":"By Pascal's principle, pressure is transmitted: F1/A1 = F2/A2, so F2 = F1(A2/A1). Larger area gives larger force (mechanical advantage)."},{"prompt":"In the same hydraulic lift (ideal), if the large piston produces 10 times the force of the small piston, then the large piston must move:","options":[{"label":"A","body":"10 times farther than the small piston","isCorrect":false},{"label":"B","body":"The same distance as the small piston","isCorrect":false},{"label":"C","body":"1/10 the distance of the small piston","isCorrect":true},{"label":"D","body":"100 times farther than the small piston","isCorrect":false},{"label":"E","body":"In the opposite direction","isCorrect":false}],"explanation":"Volume conservation for incompressible fluid: A1d1 = A2d2. If A2/A1 = 10, then d2 = d1/10. Force gain comes with distance loss (energy conservation)."}]}"
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