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Chapter 14: FLUIDS
1. All fluids are:
A. gases
B. liquids
C. gases or liquids
D. non-metallic
E. transparent
ans: C
2. Gases may be distinguished from other forms of matter by their:
A. lack of color
B. small atomic weights
C. inability to form free surfaces
D. ability to flow
E. ability to exert a buoyant force
ans: C
3. 1Pa is:
A. 1N/m
B. 1m/N
C. 1 kg/m · s
D. 1 kg/m · s2
E.1N/m · s
ans: D
4. Mercury is a convenient liquid to use in a barometer because:
A. it is a metal
B. it has a high boiling point
C. it expands little with temperature
D. it has a high density
E. it looks silvery
ans: D
5. To obtain the absolute pressure from the gauge pressure:
A. subtract atmospheric pressure
B. add atmospheric pressure
C. subtract 273
D. add 273
E. convert to N/m2ans: B
206 Chapter 14: FLUIDS
6. Barometers and open-tube manometers are two instruments that are used to measure pressure.
A. Both measure gauge pressure
B. Both measure absolute pressure
C. Barometers measure gauge pressure and manometers measure absolute pressure
D. Barometers measure absolute pressure and manometers measure gauge pressure
E. Both measure an average of the absolute andgauge pressures
ans: D
7. To measure moderately low pressures oil with a density of 8.5 × 102 kg/m3 is used in place of
mercury in a barometer. A change in the height of the oil column of 1.0mm indicates a change
in pressure of about:
A. 1.2 × 10−7 Pa
B. 1.2 × 10−5 Pa
C. 0.85Pa
D. 1.2Pa
E. 8.3Pa
ans: E
8. The pressure exerted on the ground by a man is greatest when:
A. he stands withboth feet flat on the ground
B. he stands flat on one foot
C. he stands on the toes of one foot
D. he lies down on the ground
E. all of the above yield the same pressure
ans: C
9. The vessels shown below all contain water to the same height. Rank them according to the
pressure exerted by the water on the vessel bottoms, least to greatest..........................................................................................................................
1
.................................................................................................................................................
2
.........................................................................................................................
3
..............................................................
.................................................
4
A. 1, 2, 3, 4
B. 3, 4, 2, 1
C. 4, 3, 2, 1
D. 2, 3, 4, 1
E. All pressures are the same
ans: E
Chapter 14: FLUIDS 207
10. In a stationary homogeneous liquid:
A. pressure is the same at all points
B. pressure depends on the direction
C. pressure is independent of any atmospheric pressure on the upper surface of theliquid
D. pressure is the same at all points at the same level
E. none of the above
ans: D
11. Which of the following five statements, concerning the upper surface pressure of a liquid, is
FALSE?
A. It is independent of the surface area
B. It is the same for all points on that surface
C. It would not increase if the liquid depth were increased
D. It would increase if the liquid density wereincreased
E. It would increase if the atmospheric pressure increased
ans: D
12. Several cans of different sizes and shapes are all filled with the same liquid to the same depth.
Then:
A. the weight of the liquid is the same for all cans
B. the force of the liquid on the bottom of each can is the same
C. the least pressure is at the bottom of the can with the largest bottom area
D. thegreatest pressure is at the bottom of the can with the largest bottom area
E. the pressure on the bottom of each can is the same
ans: E
13. An airtight box, having a lid of area 80 cm2, is partially evacuated. Atmospheric pressure is
1.01 × 105 Pa. A force of 600N is required to pull the lid off the box. The pressure in the box
was:
A. 2.60 × 104 Pa
B. 6.35 × 104 Pa
C. 7.50 × 104 Pa
D. 1.38 ×...