1. Lining of a canal is necessary ?

to minimise the seepage losses in canal

to prevent erosion of bed and sides due to high velocities

to increase the discharge in canal section by increasing the velocity

all of the above

Answer: all of the above

Explanation:


2. Kennedy, in his silt theory, assumed that the silt is kept in suspension because of eddies (a) Lacey's theory from the ?

bed only

sides only

whole perimeter to the bed width

any of these

Answer: bed only

Explanation:


3. A deflecting groyne in a river is ?

inclined towards upstream

perpendicular to bank

inclined towards downstream

none of these

Answer: perpendicular to bank

Explanation:


4. The river training works are adopted on a river ?

to pass high flood discharge safely and quickly through the breach

to direct and guide the river flow

to reduce bank erosion to a minimum

all of the above

Answer: all of the above

Explanation:


5. In Bligh's creep theory ?

there is no distinction between horizontal and vertical creep

loss of head does not take place in the same proportion as creep length

the uplift pressure distribution is not linear, but follows a sine curve

all of the above

Answer: all of the above

Explanation:


6. The ratio of the rate of change of discharge of an outlet to the rate of change of the discharge of the distributing channel, is termed as ?

proportionality

flexibility

sensitivity

efficiency

Answer: flexibility

Explanation:


7. A fall, which maintains the depth is a ?

trapezoidal notch fall

rectangular notch fall

low weir fall

all of these

Answer: all of these

Explanation:


8. In a flexible outlet, the discharge depends upon the ?

water level in distributary

water level in water course

difference of water levels between distributary and water course

none of the above

Answer: water level in distributary

Explanation:


9. The weed growth in a canal leads to ?

decrease in silting

decrease in discharge

increase in discharge

increase in velocity of flow

Answer: decrease in discharge

Explanation:


10. Okhla weir on Yamuna river, in Delhi, is an example of ?

vertical drop weir

drystone slope weir

concrete slope weir

parabolic weir

Answer: drystone slope weir

Explanation: