3–17. A manometer is an example of forces in equilibrium. The  forces  that balance each other are the 1. 2. 3. 4. force  exerted  by  the  atmosphere and the force exerted by the liquid  inside  the  closed container force exerted by the gas inside the  closed  container  plus  the weight of the liquid on one side of the tube, and the force exerted  by  the  atmosphere  plus the weight of the liquid in the other side of the tube force exerted by the steam in the steam line and the weight of a column of liquid force exerted by the gas inside the closed container and the weight of part of the liquid in the tube 3–18. What  instruments  are interchangeable  as  pressure– measuring   devices? 1. Aneroid  barometer  and  mercurial barometer 2. Schrader  gauge  and  manometer 3. Spring scale and steel yard 4. Bourdon  gauge  and  diaphragm– type  pressure  gauge 3–19. Hydrostatic  pressure  is  the pressure  exerted  by 1. gas in motion 2. gas at rest 3. liquid at rest 4. liquid in motion 3–20. Density is defined in terms of 1. pressure  and  volume 2. weight  and  distance 3. pressure and area 4. weight  and  volume 3–21. The pipes in figure 3A are filled with water. Pipe AB is vertical; pipe CB is horizontal; pipe ED points downward at an angle. The point of greatest pressure is at point 1.  A 2.  B 3.  C 4.  D 3–22. The density of lead is approximately  how  many  times greater than the density of water? 1. 5 2. 7 3. 9 4. 11 3–23. Which of the following is a true statement  concerning  the  pressure of water on a submerged submarine? 1. 2. 3. 4. The pressure is equal on the top and on the bottom The pressure is greater on the top than on the bottom The pressure is greater on the bottom than on the top There is pressure only on the top 24