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Urbanization usually results in an increase in flood frequency because
less water is able to runoff in streams
less water is able to infiltrate into the ground,so instead is discharged rapidly i ntostreams
more water is used by humans and then discharged to streams
rainfall is greater in urban areas than in rural areas
A flash flood is a flood that Flood
is caused by heavy rain rather than from the flooding of a river
occurs in urban areas
occurs suddenly and unexpectedly and for a short duration
is caused by the blocking of drains
The process of avulsion is caused by
erosion of the river channel
buildup of sediment in the river channel
widening of the channel
destruction of natural levees
The process of avulsion causes
downcutting of the riverbed
wider floodplains for the river
slow shifting of the rivers channel
formation of a new course for the river channel
In ancient Egypt the Nile River
changed its course almost every year
destroyed large areas of farming land every year
had to be regulated because it carried too much water
brought nutrients that made the fields fertile
Which of the following is not a characteristic of a braided stream?
constant discharge
branching channels
high gradient
abundant bed load
The Probable Maximum Flood is:
the maximum flood experienced since flood records have existed
an estimation of the largest possible flood that could occur at a particul ar location
the maximum flood experienced in the last 100 years
the maximum flood experienced in the last 200 years
The flooding of New Orleans in 2004 was caused by
a tornado
an earthquake
a tsunami
a hurricane
Flooding in London is prevented by
high dams along the Themes
a barrier that is raised and lowered
gates in the western part of the city
westerly winds
How many inches of fast-moving flood water can knock you off your feet?
6 inches
8 inches
10 inches
A moving conductor coil produces an induced e.m.f. This isin accordance with
Coulomb's law
Lenz's law
Faraday's law
The National flood Commission in India was set up in
1980
1985
1995
1976
The smallest resistance that can be obtained by the combination of n resistors each resistance r is :
r/n
nr
r
n2r
By increasing the temperature, the specific resistance of a conductor and semiconductor
Increases for both
Decreases for conductor, increases for semiconductor
Increases, decreases
Decreases for both
The H-O-H bond angle in water molecule is
104 degrees
104.5 degrees
105 degrees
105.5 degrees
Water is a
polar solvent
non polar solvent
an amphipathic solvent
non polar uncharged solvent
Taste of water of seas and oceans is
sweet
tasteless
bitter
salty
Color of water is
White
Grey
Dark
Colorless
Taste of water is
sour
bitter
sweet
tasteless
The smell of water is
sweet
bad
its orderless
irritating
