Grade 10 Physics · Strand 1: Mechanics and Thermal Physics · Pressure
Pressure in Liquids and Depth
A short Grade 10 Physics lesson for the CBE curriculum, part of Mechanics and Thermal Physics: Pressure. Learn it on any phone with notes and slides, then check yourself with a quick quiz and earn XP. This lesson is free.
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1. A tall cylinder filled with water has three identical holes at different heights. Why does the water from the bottom hole shoot out farthest?
- A. The bottom hole has the greatest depth of water above it, so the pressure there is highest
- B. The bottom hole is closest to the bench, so the water has less distance to fall
- C. The water at the bottom is a different liquid with a higher density
- D. Air pressure is greater at the bottom hole than at the top hole
2. The concrete wall of Masinga Dam is much thicker at the base than at the top. What is the reason?
- A. Water pressure is greatest at the bottom of the reservoir, so the base must resist the largest sideways force
- B. Water pressure is greatest at the top of the reservoir, so the top is made thin to save concrete
- C. A thick base makes the dam hold more water than a thin one
- D. Water pushes only downwards, so the base must carry all the weight
3. Two identical tanks are filled to the same depth, one with fresh water and the other with cooking oil. Cooking oil is less dense than water. How does the pressure at the bottom of each tank compare?
- A. The pressure is the same in both tanks because the depth is the same
- B. The pressure is greater in the oil tank because oil is thicker
- C. The pressure is greater in the water tank because water is denser
- D. The pressure is zero in the oil tank because oil floats on water
4. In fresh water, the pressure caused by the water increases by about 10 000 Pa for every metre of depth. A diver in Lake Victoria swims down to a depth of 7 m. What extra pressure does the water alone exert on the diver?
Type your answer (in Pa) in the lesson.
5. What name is given to the upward force on a submerged object, caused by the pressure under it being greater than the pressure above it?
Type your answer in the lesson.
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