Mcq s Hydrology

CECOS UNIVERSITY OF IT AND EMERGING SCIENCES DEPARTMENT OF CIVIL ENGINEERING Hydrology, water resource and drainage Engineering (CE-2011) FINAL PAPER, MAY, 2014 TH 6  SEMESTER.  ROLL .NO…………….. SEC ……

 Note: - Use of mobile phones and programmable calculator is not allowed. Attempt all questions, all questions carry equal marks, solve PART –  PART –  1  1 on the question paper and return to the invigilator within the allocated time. PART  –  1  1 Time allowed = 25 min 

(MAX MARKS = 20)

Q .NO. 1) MULTIPLE choice questions, encircle the correct option. I.

In a cold front a) cold air mass drives out a warm air mass b)  warm air mass replaces the retreating cold air mass c) cold air and warm air masses are drawn simultaneously towards a low pressure area d) the cold and warm air masses are stationary  II.  The activity of planning, developing, distributing and managing the optimum use of water resources is a) Drainage basin management b) Surface water hydrology c)  Water resource management management d) Hydro informatics III. Colorado pan is a type of a) Floating evaporation pan b) On ground evaporation pan c) Sunken evaporation pan d) None of these IV.  The ice coating formed on drizzle or rain drops as it comes in contact with the cold surfaces on the ground. a) Sleet b) Snow flake c) Glaze d) hail  V.  The main cause of Convectional Convectional precipitation precipitation is a) Striking of moisture laden air with mountains b) Flow of moisture laden air from a high to low pressure area c) Flow of moist air from lower to higher elevation d) rising of warmer, lighter air in colder, denser surroundings  VI.  Arithmetic mean method method cannot be applied applied if a)  The normal annual precipitation of the index stations lies within 10% of normal annual precipitation of interpolation interpolation station. b) Rainfall data is missing for the index station.

CECOS UNIVERSITY OF IT AND EMERGING SCIENCES DEPARTMENT OF CIVIL ENGINEERING c)  The normal annual precipitation of the index stations is greater than 10% of normal annual precipitation of interpolation station. d)  All of the above  VII. A rain gauge recorded 145 mm of precipitation. It was found later that the gauge was inclined at an angle of 60 degrees with the horizontal the actual precipitation is a) 167.4mm b) 290mm c) 125.6mm d) 72.5mm  VIII.  The correction factor in case of consistency of precipitation data is obtained as a) Sa / So b) Sa*So c) So /Sa * where Sa = slope prior to break, So = slope after break & Po = observed d) (Sa / So )* Po  precipitation

IX. If interception and depression storage is neglected then a) Ф Index = W index b) Ф Index > W index c) Ф Index < W index d) Not relevant X. Interception loss is. a) More towards the end of a storm b) More at the beginning of a storm c) Uniform throughout the storm d) High in the beginning of storm and gradually decreases XI.  The main cause of Convectional precipitation is e) Striking of moisture laden air with mountains f) Flow of moisture laden air from a high to low pressure area g) Flow of moist air from lower to higher elevation h) rising of warmer, lighter air in colder, denser surroundings XII. A weighing type rain gauge a) Can measure rain event but cannot measure snow event b) Can only measure rain event c) Can only measure snow event d) Can measure both rain and snow event. XIII. Arithmetic mean method cannot be applied if e)  The normal annual precipitation of the index stations lies within 10% of normal annual precipitation of interpolation station. f) Rainfall data is missing for the index station. g)  The normal annual precipitation of the index stations is greater than 10% of normal annual precipitation of interpolation station. h)  All of the above XIV.  A rain gauge recorded 145 mm of precipitation. It was found later that the gauge was inclined at an angle of 60 degrees with the horizontal the actual precipitation is e) 167.4mm

CECOS UNIVERSITY OF IT AND EMERGING SCIENCES DEPARTMENT OF CIVIL ENGINEERING f) 290mm g) 125.6mm h) 72.5mm

XV.  Time interval from the center of mass of the rainfall-excess to the peak of the resultant hydrograph is called a) Lag time b) time of concentration c) time to peak d) rainfall duration XVI. All of the following are graphical methods of hydrograph analysis except a) Fixed base length method b) variable slope method c) Recession curve equation d) straight line method. XVII. The minimum, acceptable recurrence interval of a hazardous event such as flood or storm is called a) Frequency of the event c) Return period

b) lag time d) design flood

XVIII. Optimal structure size according to economic risk anal ysis is a) Having minimum structural cost b) having maximum life c) Having minimum total cost d) having maximum structural cost and risk cost XIX. Time required for runoff to travel from the hydraulically most distant point on the watershed to the point of interest is called a)  The basin lag time c) Time to peak

b) concentration time d) both b and c

XX. If rainfall of the same intensity occurs for duration less than the time of con centration, the hydrograph will rise to a)  A higher peak c) Peak will not be affected

b) A smaller peak d) only infiltration will occur.

XXI. The ordinate of unit hydrograph is obtained by a) Ordinate of DRO*Peff  c) Peak will not be affected

b) (Ordinate of DRO+Peff  )/A d) Ordinate of DRO*Peff 

XXII. For a total runoff of 480 cusecs, if th e base flow is 30 cusecs and the effective rainfall depth is 1.5in then the ordinate of unit hydrograph is

a) 320 cusecs c) 720 cusecs

b) 300 cusecs d) insufficient information

XXIII. In two point’s method the average velocity is a) V0.6d

 b) (V0.2d+V0.8d)/2

CECOS UNIVERSITY OF IT AND EMERGING SCIENCES DEPARTMENT OF CIVIL ENGINEERING c) (V0.3d+V0.6d)/2

d) (V0.2d+V0.8d)/3

XXIV. For the same intensity of rainfall, the flood discharge from a relatively small catchment is …………….. That from a relatively large catchment. a) Lower than c) Higher than

b) same as d) flood discharge is not related to basin area

XXV. The maximum amount and duration of precipitation that can be expected to o ccur on a drainage basin a) Maximum intensity precipitation c) Design storm

b) probable maximum precipitation d) spatially uniform precipitation

XXVI. The stage-discharge is the relation between the a)  Velocity of flow and discharge c) Staff gauge reading and discharge

b) staff gauge reading and velocity of flow d) staff gauge reading and volume

XXVII. In major dams with high threat to life loss, failure a) Can never occur c) Is to be decided by the critical event

b) is accepted within 25% of the design life d) can be tolerated.