Grade 10 Physics · Strand 1: Mechanics and Thermal Physics · Pressure
Measurement of Pressure
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. Why is water not used in a standard barometer to measure atmospheric pressure?
- A. Water is too dense, so the column would be too short to read
- B. Water would need a tube over 10 m tall because its density is low
- C. Water cannot exert pressure on the surface of a liquid
- D. Water does not form a meniscus in a glass tube
2. A mercury barometer at a weather station in Nakuru reads 550 mm. Taking the density of mercury as 13,600 kg/m^3 and g = 10 N/kg, calculate the atmospheric pressure in pascals.
Type your answer (in Pa) in the lesson.
3. A U-tube manometer containing oil has one arm connected to a gas container and the other arm open to the air. The oil level is 10 cm higher in the open arm than in the arm connected to the gas. What does this show?
- A. The gas pressure is lower than atmospheric pressure
- B. The gas pressure is equal to atmospheric pressure
- C. The gas pressure is greater than atmospheric pressure
- D. The atmospheric pressure is zero
4. A water manometer (density 1,000 kg/m^3) is connected to a gas cylinder. The water level in the open arm is 20 cm higher than in the arm connected to the gas. If atmospheric pressure is 100,000 Pa and g = 10 N/kg, find the absolute pressure of the gas.
Type your answer (in Pa) in the lesson.
5. What name is given to the curved upper surface of a liquid in a narrow tube, such as the top of the mercury column in a barometer?
Type your answer in the lesson.
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