Viscosity
Which fluid would flow more slowly down an inclined plane?
A. Water
B. Cooking oil
C. Maple syrup
D. Rubbing alcohol
C. Maple syrup
An object sinks in water. What must be true?
A. Its density is greater than water
B. Its mass is small
C. Its volume is small
D. Water has no buoyant force
A. Its density is greater than water
As you dive deeper in a swimming pool, what happens to the water pressure?
A. It decreases
B. It increases
C. It remains the same
D. It fluctuates randomly
B. It increases
An object floats in water. What must be true?
A. The object has a greater density than water
B. The object has a lower density than water
C. The object is very small
D. Water has no pressure
B. The object has a lower density than water
What property of a fluid describes its resistance to flow?
A. Density
B. Volume
C. Viscosity
D. Buoyancy
C. Viscosity
Which shows the correct relationship between flow rate and viscosity?
A. Higher viscosity → faster flow
B. Lower viscosity → slower flow
C. Higher viscosity → slower flow
D. Viscosity and flow rate are unrelated
C. Higher viscosity → slower flow
Which of the following is the correct formula for calculating density?
A. Density = Volume ÷ Mass
B. Density = Mass × Volume
C. Density = Mass ÷ Volume
D. Density = Volume × Pressure
C. Density = Mass ÷ Volume
What causes fluid pressure?
A. The weight of the fluid
B. The volume of the fluid
C. The temperature of the fluid
D. The color of the fluid
A. The weight of the fluid
A rock sinks in water because:
A. It pushes aside more water than its weight
B. The buoyant force is weaker than the force of gravity on the rock
C. Water pressure is strongest at the surface
D. Rocks cannot displace water
B. The buoyant force is weaker than the force of gravity on the rock
An object with a density of 0.8 g/cm³ is placed in water (density = 1.0 g/cm³). What will happen to the object?
A. It will sink completely
B. It will float partially submerged
C. It will remain suspended in the middle
D. It will float with 80% of its volume submerged
D. It will float with 80% of its volume submerged
Which factor does NOT affect the viscosity of a fluid?
A. Cohesion between particles
B. Adhesion between the fluid and the surface
C. Internal friction between particles
D. The volume of the fluid
D. The volume of the fluid
A substance has a mass of 35g and a volume of 5cm³. What is its density?
A. 5 g/cm³
B. 7 g/cm³
C. 30 g/cm³
D. 175 g/cm³
B. 7 g/cm³
Which of the following would NOT affect the pressure at the bottom of a container filled with water?
A. The depth of the water
B. The density of the water
C. The width of the container
D. The gravitational force
C. The width of the container
Which statement about buoyancy is TRUE?
A. The buoyant force equals the weight of the fluid displaced
B. The buoyant force equals the mass of the object
C. The buoyant force decreases as an object sinks deeper
D. The buoyant force depends only on the shape of the object
A. The buoyant force equals the weight of the fluid displaced
Fluids exert force __________ to the surface they touch.
A. Parallel
B. Upward only
C. Downward only
D. Perpendicular
D. Perpendicular
A mechanic stores motor oil in an unheated garage over winter. On a very cold morning, the oil pours extremely slowly, but after the garage warms up in the afternoon, the same oil pours much faster.
Which statement best explains this change?
A. Heating the oil increases the cohesion between its particles
B. Heating the oil decreases the viscosity by giving particles more energy to move
C. Cooling the oil reduces adhesion with the container
D. Viscosity does not depend on temperature, so another factor must be involved
B. Heating the oil decreases the viscosity by giving particles more energy to move
A student measures the mass of an irregular rock as 27 grams. When placed in a graduated cylinder, the water level rises from 20 mL to 29 mL. What is the density of the rock?
A. 3.0 g/mL
B. 0.3 g/mL
C. 9.0 g/mL
D. 27 g/mL
A. 3.0 g/mL
During the demo, a heated pop can was placed upside down into cold water and instantly collapsed. What best explains why the can was crushed?
A. The cold water made the metal shrink suddenly
B. The hot can expanded and broke under its own weight
C. The steam inside the can condensed back into liquid water, creating very low pressure inside, and the higher outside air pressure crushed the can
D. The water pressure forced its way into the can and broke the metal
C. The steam inside the can condensed back into liquid water, creating very low pressure inside, and the higher outside air pressure crushed the can
Why does a boat float on water even though it is made of dense metal?
A. The metal becomes lighter when heated by the sun
B. The shape increases the overall volume, lowering average density
C. The water pressure pushes the boat up more than gravity pulls it down
D. The boat traps air, which reduces the mass of the metal
B. The shape increases the overall volume, lowering average density
What is the relationship between the mass and volume of a substance with a constant density?
A. If mass increases, volume decreases
B. If mass increases, volume increases
C. Mass and volume are not related
D. If mass increases, volume remains the same
B. If mass increases, volume increases
Three fluids (A, B, and C) flow through identical tubes. The same pressure is applied to each tube.
Fluid A flows through in 2 seconds
Fluid B flows through in 10 seconds
Fluid C does not flow at all unless extra pressure is added
Which statement is correct?
A. Fluid A has the highest viscosity
B. Fluid B has the lowest viscosity
C. Fluid C has the highest viscosity
D. Fluids A and B have the same viscosity
C. Fluid C has the highest viscosity
A cube has a side length of 5 cm. The material of the cube has a density of 2.5 g/cm³. What is the mass of the cube?
A. 31.25 g
B. 62.5 g
C. 312.5 g
D. 250 g
C. 312.5 g
If three containers of different shapes are connected at the bottom so that water can flow freely between them, what will happen to the water levels after the system is left undisturbed?
A. The water level will be highest in the widest container
B. The water level will be lowest in the tallest, narrow container
C. All containers will reach the same water level because pressure at the bottom becomes equal
D. The water will stay at different heights because each container has a different shape
C. All containers will reach the same water level because pressure at the bottom becomes equal
A large, completely airtight wooden box is pushed into a lake. At first it floats high on the water. But as it is pushed deeper and deeper, the box begins to creak, and the wood slightly compresses from the water pressure. Eventually, the box stays fully underwater without popping back up. What best explains why it no longer floats back to the surface?
A. Water pressure becomes stronger than gravity at greater depths
B. The box compresses enough that its density increases and it now displaces less water than before
C. Wood becomes heavier underwater, canceling the buoyant force
D. Buoyant force stops working once an object goes deep enough
B. The box compresses enough that its density increases and it now displaces less water than before
A rectangular tank has dimensions of 4 m × 3 m × 2 m. If it is filled with water (density = 1000 kg/m³), what is the mass of the water?
A. 9,000 kg
B. 24,000 kg
C. 14,000 kg
D. 24 kg
B. 24,000 kg