Question 1

Which of the following five statements, concerning the upper surface pressure of a liquid, is FALSE?

Accepted Answer

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 were increased 
E) it would increase if the atmospheric pressure increased 
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 were increased 
E) it would increase if the atmospheric pressure increased

Question 2

1 Pa is:

Accepted Answer

A) 1 N/m 
B) 1 m/N 
C) 1 kg/m.s 
D) 1 kg/m.s2 
E) 1 N/m.s 
A) 1 N/m 
B) 1 m/N 
C) 1 kg/m.s 
D) 1 kg/m.s2 
E) 1 N/m.s

Question 3

One end of a cylindrical pipe has a radius of 1.5 cm.Water (density = 1.0 x 103 kg/m3)streams steadily out at 7.0 m/s.The rate at which mass is leaving the pipe is:

Accepted Answer

A) 2.5 kg/s 
B) 4.9 kg/s 
C) 7.0 kg/s 
D) 48 kg/s 
E) 7.0 x103 kg/s 
A) 2.5 kg/s 
B) 4.9 kg/s 
C) 7.0 kg/s 
D) 48 kg/s 
E) 7.0 x103 kg/s

Question 4

A small steel ball floats in a half-full container of mercury.When water is added:

Accepted Answer

A) the ball will float on the water 
B) the ball will rise slightly 
C) the mercury will float on the water 
D) the ball will sink to the bottom of the container 
E) the ball will lower slightly more into the mercury 
A) the ball will float on the water 
B) the ball will rise slightly 
C) the mercury will float on the water 
D) the ball will sink to the bottom of the container 
E) the ball will lower slightly more into the mercury

Question 5

An open-tube manometer is used to measure the gauge pressure in a tank.If the manometer is filled with mercury, and the open end is at a height of 15 cm above the end attached to the tank, what is the gauge pressure in the tank? The density of mercury is 14 x 103 kg/m3.

Accepted Answer

A) 2.1 x 103 Pa 
B) 2.1 x 104 Pa 
C) 4.0 x 104 Pa 
D) 1.2 x 105 Pa 
E) 2.1 x 106 Pa 
A) 2.1 x 103 Pa 
B) 2.1 x 104 Pa 
C) 4.0 x 104 Pa 
D) 1.2 x 105 Pa 
E) 2.1 x 106 Pa

Question 6

The principle of fluid pressure which is used in hydraulic brakes or lifts is that:

Accepted Answer

A) pressure is the same at all levels in a fluid 
B) increases of pressure are transmitted equally to all parts of a fluid 
C) the pressure at a point in a fluid is due to the weight of the fluid above it 
D) increases of pressure can only be transmitted through fluids 
E) the pressure at a given depth is proportional to the depth in the fluid 
A) pressure is the same at all levels in a fluid 
B) increases of pressure are transmitted equally to all parts of a fluid 
C) the pressure at a point in a fluid is due to the weight of the fluid above it 
D) increases of pressure can only be transmitted through fluids 
E) the pressure at a given depth is proportional to the depth in the fluid

Question 7

A large tank filled with water has two holes in the bottom, one with twice the radius of the other.In steady flow the speed of water leaving the larger hole is ________ the speed of the water leaving the smaller.

Accepted Answer

A) twice 
B) four times 
C) half 
D) one-fourth 
E) the same as 
A) twice 
B) four times 
C) half 
D) one-fourth 
E) the same as

Question 8

Barometers and open-tube manometers are two instruments that are used to measure pressure.Which statement is true?

Accepted Answer

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 and gauge pressures 
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 and gauge pressures

Question 9

A large water tank, open at the top, has a small hole in the bottom.When the water level is 30 m above the bottom of the tank, the speed of the water leaking from the hole:

Accepted Answer

A) is 2.5 m/s 
B) is 24 m/s 
C) is 44 m/s 
D) cannot be calculated unless the area of the hole is given 
E) cannot be calculated unless the areas of the hole and tank are given 
A) is 2.5 m/s 
B) is 24 m/s 
C) is 44 m/s 
D) cannot be calculated unless the area of the hole is given 
E) cannot be calculated unless the areas of the hole and tank are given

Question 10

The dimensions of a wooden raft (density = 150 kg/m3)are 3.0 m x 3.0 m x1.0 m.What maximum load can it carry in sea water (density =1020 kg/m3)?

Accepted Answer

A) 1350 kg 
B) 7800 kg 
C) 9200 kg 
D) 19,500 kg 
E) 24,300 kg 
A) 1350 kg 
B) 7800 kg 
C) 9200 kg 
D) 19,500 kg 
E) 24,300 kg

Question 11

The diagram shows a pipe of uniform cross section in which water is flowing.The directions of flow and the volume flow rates (in cm3/s)are shown for various portions of the pipe.The direction of flow and the volume flow rate in the portion marked A are:

Accepted Answer

A) "$\downarrow$ and 3 cm3/s" 
B) "$\uparrow$ and 7 cm3/s" 
C) "$\downarrow$ and 9 cm3/s" 
D) "$\uparrow$ and 11 cm3/s" 
E) "$\downarrow$15 cm3/s" 
A) "$\downarrow$ and 3 cm3/s" 
B) "$\uparrow$ and 7 cm3/s" 
C) "$\downarrow$ and 9 cm3/s" 
D) "$\uparrow$ and 11 cm3/s" 
E) "$\downarrow$15 cm3/s"

Exam 14: Fluids

Which of the following five statements, concerning the upper surface pressure of a liquid, is FALSE?

1 Pa is:

One end of a cylindrical pipe has a radius of 1.5 cm.Water (density = 1.0 x 103 kg/m3)streams steadily out at 7.0 m/s.The rate at which mass is leaving the pipe is:

A small steel ball floats in a half-full container of mercury.When water is added:

An open-tube manometer is used to measure the gauge pressure in a tank.If the manometer is filled with mercury, and the open end is at a height of 15 cm above the end attached to the tank, what is the gauge pressure in the tank? The density of mercury is 14 x 103 kg/m3.

The principle of fluid pressure which is used in hydraulic brakes or lifts is that:

A large tank filled with water has two holes in the bottom, one with twice the radius of the other.In steady flow the speed of water leaving the larger hole is ________ the speed of the water leaving the smaller.

Barometers and open-tube manometers are two instruments that are used to measure pressure.Which statement is true?

A large water tank, open at the top, has a small hole in the bottom.When the water level is 30 m above the bottom of the tank, the speed of the water leaking from the hole:

The dimensions of a wooden raft (density = 150 kg/m3)are 3.0 m x 3.0 m x1.0 m.What maximum load can it carry in sea water (density =1020 kg/m3)?

The diagram shows a pipe of uniform cross section in which water is flowing.The directions of flow and the volume flow rates (in cm3/s)are shown for various portions of the pipe.The direction of flow and the volume flow rate in the portion marked A are:

Measurement

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Motion in Two and Three Dimensions

Force and Motion

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Filters

One end of a cylindrical pipe has a radius of 1.5 cm.Water (density = 1.0 x 10³ kg/m³)streams steadily out at 7.0 m/s.The rate at which mass is leaving the pipe is:

An open-tube manometer is used to measure the gauge pressure in a tank.If the manometer is filled with mercury, and the open end is at a height of 15 cm above the end attached to the tank, what is the gauge pressure in the tank? The density of mercury is 14 x 10³ kg/m³.

The dimensions of a wooden raft (density = 150 kg/m³)are 3.0 m x 3.0 m x1.0 m.What maximum load can it carry in sea water (density =1020 kg/m³)?

The diagram shows a pipe of uniform cross section in which water is flowing.The directions of flow and the volume flow rates (in cm³/s)are shown for various portions of the pipe.The direction of flow and the volume flow rate in the portion marked A are: