2015

Question 1

If specific gravity of the liquid increases, for the same pressure, the equivalent height of column will:
A. increase 
B. decrease 
C. stay the same 
D. first increase then decrease

Answer 1

B. decrease

Question 2

Which equation correctly relates pressure and liquid column?
A. 𝑃=𝜌𝑣
B. 𝑃=𝛾ℎ
C. 𝑃=𝐹/𝐴ℎ
D. 𝑃=𝑔ℎ”2

Answer 2

B. 𝑃=𝛾ℎ

Question 3

1 atmosphere is closest to which of the following heads of water?
A. 1 m 
B. 5 m 
C. 10.3 m 
D. 100 m

Answer 3

C. 10.3 m

Question 4

Surface tension is measured in:
A. N
B. N/m²
C. N/m
D. m/N

Answer 4

C. N/m

Question 5

Which will decrease surface tension of water?
A. Cooling the water
B. Adding detergent/soap
C. Removing air bubbles
D. Increasing depth

Answer 5

B. Adding detergent/soap

Question 6

Property responsible for resistance to shear flow in liquids is called:
A. surface tension
B. viscosity
C. compressibility
D. capillarity

Answer 6

B. viscosity

Question 7

Gauge pressure at the free surface of an open water tank is:
A. zero 
B. 1 kPa 
C. 9.81 kPa 
D. 101.3 kPa

Answer 7

A. zero

Question 8

Doubling the depth in a static fluid will:
A. double the pressure 
B. triple the pressure 
C. halve the pressure 
D. not change the pressure

Answer 8

A. double the pressure (since P ∝ h)

Question 9

Which statement is TRUE for hydrostatic pressure in an incompressible fluid?
A. It depends only on area.
B. It depends only on volume.
C. It depends on depth and unit weight.
D. It is constant everywhere.

Answer 9

C. It depends on depth and unit weight.

Question 10

The elastic tendency of liquids which makes them acquire the least surface area as possible. It is responsible, for example, when an object or insect such as mosquitoes that is denser than water is able to float or run along the water surface.
A. surface tension 
B. viscosity 
C. modulus of elasticity 
D. specific gravity

Answer 10

A. surface tension

Question 11

Hydrostatic force depends on:
A. area only
B. depth only
C. density × depth × area
D. shape only

Answer 11

C. density × depth × area

Question 12

If SG increases, force:
A. decreases
B. stays same
C. increases
D. becomes zero

Answer 12

C. increases

Question 13

Pressure on vertical plates varies with:
A. horizontal position
B. container shape
C. depth
D. atmospheric pressure only

Answer 13

C. depth

Question 14

If SG_object ↑ then object:
A. floats more
B. sinks deeper
C. unaffected
D. floats higher

Answer 14

B. sinks deeper

Question 15

Submerged fraction equals:
A. SG_fluid / SG_object
B. SG_object / SG_fluid
C. SG²_object
D. SG_fluid / 2

Answer 15

B. SG_object / SG_fluid

Question 16

Lower SG → draft becomes:
A. shallower
B. deeper
C. same
D. zero

Answer 16

B. deeper

Question 17

Buoyant force equals:
A. weight of water displaced
B. weight of object
C. always constant
D. SG × draft

Answer 17

A. weight of water displaced

Question 18

When SG increases, floating object:
A. sinks
B. floats higher
C. unchanged
D. tips over

Answer 18

B. floats higher

Question 19

For full circular pipe, hydraulic radius equals:
A) 𝐷/4
B) 𝐷/2
C) 𝐷
D) 2𝐷

Answer 19

A) 𝐷/4

Question 20

Headloss per length is also called:
A) velocity head
B) slope 𝑆
C) pressure head
D) datum head

Answer 20

B) slope 𝑆

Question 21

Manning n represents:
A) viscosity
B) roughness coefficient
C) density
D) pressure

Answer 21

B) roughness coefficient

Question 22

Hydraulic radius for full circular pipe is:
A) 𝐷/2
B) 𝐷/3
C) 𝐷/4
D) 𝐷

Answer 22

C) 𝐷/4

Question 23

S in Manning equation is:
A) pipe diameter
B) slope of energy grade line
C) velocity head
D) pressure head

Answer 23

B) slope of energy grade line

Question 24

Downward acceleration causes effective gravity to:
A) increase
B) decrease
C) same
D) reverse always

Answer 24

B) decrease

Question 25

Hydrostatic pressure varies with: A) area B) depth C) volume D) shape only

Answer 25

B) depth

Question 26

If elevator is in free fall, water behaves as: A) heavier B) weightless C) solid D) vapor

Answer 26

B) weightless

Question 27

If diameter increases, discharge (for same S and n) generally: A) decreases B) increases C) same D) becomes zero

Answer 27

B) increases