Pressure in liquids and gases Quiz
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5 questions, one answer each
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1. Which two changes both increase the pressure at the bottom of a liquid?
- A. Using a wider container, using a warmer liquid
- B. Using a deeper liquid, using a less dense liquid
- C. Using a deeper liquid, using a denser liquid
- D. Using a wider container, using a shorter liquid
2. What is the pressure 3 m below the surface of water (ρ = 1000 kg/m³, g = 10 N/kg)?
- A. 30 000 Pa
- B. 3000 Pa
- C. 300 Pa
- D. 333 Pa
3. A force of 20 N acts on a small piston of area 0.01 m². The large piston has an area of 0.5 m². What force acts on the large piston?
- A. 20 N
- B. 0.4 N
- C. 100 N
- D. 1000 N
4. A mercury barometer reads a shorter column of mercury on top of a mountain than at sea level. Why?
- A. The mercury is heavier at altitude
- B. There is less air above, so atmospheric pressure is lower
- C. The mercury has expanded in the cold
- D. Gravity is much weaker on the mountain
5. A boat floats at rest on a lake. Which statement is correct?
- A. The upthrust is greater than the weight
- B. The upthrust is zero
- C. The upthrust equals the weight of the boat
- D. The weight is zero