MCQOPTIONS
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MCQOPTIONS
This section includes 49 Mcqs, each offering curated multiple-choice questions to sharpen your Hydrology knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
The parameters in Horton s infiltration equation [f(t) = fc + (fo fc)e kt] are given as, fo = 7.62 cm/ hour, fc = 1.34 cm/ hour and k = 4.182/hour. For assumed continuous ponding the cumulative infiltration at the end of 2 hours is |
| A. | 2.68 cm |
| B. | 1.50 cm |
| C. | 1.34 cm |
| D. | 4.18 cm |
| Answer» E. | |
| 2. |
The intensity of rain fall and the time interval of a typical storm are Time interval (minutes)Intensity of rainfall (mm/minute)0-100.710-201.120-302.230-401.540-501.250-601.360-700.970-800.4The maximum intensity of rainfall for 20 minutes duration of the storm is |
| A. | 1.5 mm/minute |
| B. | 1.85 mm/minute |
| C. | 2.2 mm/minute |
| D. | 3.7 mm/minute |
| Answer» C. 2.2 mm/minute | |
| 3. |
Group I contains parameters and Group II lists methods/instruments. Group IGroup IIP. Streamflow velocity1. AnemometerQ. Evapotranspiration rate2. Penman s methodR. Infiltration rate3. Horton s methodS. Wind velocity4. Current meterThe correct match of Group I with Group II is |
| A. | P-1, Q-2, R-3, S-4 |
| B. | P-4, Q-3, R-2, S-1 |
| C. | P-4, Q-2, R-3, S-1 |
| D. | P-1, Q-3, R-2, S-4 |
| Answer» D. P-1, Q-3, R-2, S-4 | |
| 4. |
The correct match of Group I with Group II is Group IGroup IIP. Evapotranspiration1. Penman methodQ. Infiltration2. Synder s methodR. Synthetic Unit3. Muskingum method HydrographS. Channel Routing4. Horton s method |
| A. | P-1, Q-3, R-4, S-2 |
| B. | P-1, Q-4, R-2, S-3 |
| C. | P-3, Q-4, R-1, S-2 |
| D. | P-4, Q-2, R-1, S-3 |
| Answer» C. P-3, Q-4, R-1, S-2 | |
| 5. |
The Muskingum model of routing a flood through a stream reach is expressed as O2 = K0I2 + K1I1 + K2O1, where K0, K1 and K2 are the routing coefficients for the concerned reach, I1 and I2 are the inflows to the reach, and O1 and O2 are the outflows from the reach corresponding to time steps 1 and 2 respectively. The sum of K0, K1 and K2 of the model is |
| A. | 1 |
| B. | 0.5 |
| C. | 0.5 |
| D. | 1 |
| Answer» E. | |
| 6. |
Group I lists a few devices while Group II provides information about their uses. Match the devices with their corresponding use. Group IGroup IIP. Anemometer1. Capillary potential of soil waterQ. Hygrometer2. Fluid velocity at a specific point in the flow streamR. Pitot Tube3. Water vapour content of airS. Tensiometer4. Wind speed |
| A. | P - 1; Q - 2; R - 3; S - 4 |
| B. | P - 2; Q - 1; R - 4; S - 3 |
| C. | P - 4; Q - 2; R - 1; S - 3 |
| D. | P - 4; Q - 3; R - 2; S - 1 |
| Answer» E. | |
| 7. |
The vertical hydraulic conductivity of the top soil at certain is 0.2 cm/h. A storm of intensity 0.5 cm/ hr occurs over the soil for an indefinite period. Assuming the surface drainage to be adequate, the infiltration rate after the storm has lasted for a very long time, shall be |
| A. | smaller than 0.2 cm/hr |
| B. | 0.2 cm/ hr |
| C. | between 0.2 and 0.5 cm/hr |
| D. | 0.5 cm/hr |
| Answer» C. between 0.2 and 0.5 cm/hr | |
| 8. |
The Muskingum model of routing a flood through a stream reach is expressed as O |
| A. | 1 |
| B. | 0.5 |
| C. | 0.5 |
| D. | 1 |
| Answer» E. | |
| 9. |
The catchment area of the watershed is |
| A. | 3.24 km |
| B. | 32.4 km |
| C. | 324 km |
| D. | 3240 km |
| Answer» D. 3240 km | |
| 10. |
Catchment area represented by this unit hydrograph is |
| A. | 1.0 km |
| B. | 2.0 km |
| C. | 3.2 km |
| D. | 5.4 km |
| Answer» E. | |
| 11. |
A linear reservoir is one in which |
| A. | Storage varies linearly with time |
| B. | Storage varies linearly with outflow rate |
| C. | Storage varies linearly with inflow rate |
| D. | Storage varies linearly with elevation |
| Answer» C. Storage varies linearly with inflow rate | |
| 12. |
The peak discharge of four hour unit hydrograph is |
| A. | 40 m /s |
| B. | 50 m /s |
| C. | 60 m /s |
| D. | 70 m /s |
| Answer» C. 60 m /s | |
| 13. |
What is the catchment area represented by the unit hydrograph? |
| A. | 1.00 km |
| B. | 2.00 km |
| C. | 7.92 km |
| D. | 8.64 km |
| Answer» D. 8.64 km | |
| 14. |
A storm of 6.6 cm occurs uniformly over the catchment in 3 hours. If f-index is equal to 2 mm/h and base flow is 5 m /s, what is the peak flow due to the storm? |
| A. | 41.0 m /s |
| B. | 43.4 m /s |
| C. | 53.0 m /s |
| D. | 56.2 m /s |
| Answer» D. 56.2 m /s | |
| 15. |
If there is rainfall of 5.4 cm in 1 hour, the ordinate of the flood hydrograph at 15th hour is |
| A. | 225 m /sec |
| B. | 240 m /sec |
| C. | 249 m /sec |
| D. | 258 m /sec |
| Answer» C. 249 m /sec | |
| 16. |
The direct runoff hydrograph of a storm obtained from a catchment is triangular in shape and has a base period of 80 hours. The peak flow rate is 30 m /sec and catchment area is 86.4 km . The rainfall excess that has resulted the above hydrograph is |
| A. | 5 cm |
| B. | 8 cm |
| C. | 10 cm |
| D. | 16 cm |
| Answer» B. 8 cm | |
| 17. |
The parameters in Horton s infiltration equation [f(t) = f |
| A. | 2.68 cm |
| B. | 1.50 cm |
| C. | 1.34 cm |
| D. | 4.18 cm |
| Answer» E. | |
| 18. |
In an area of 200 hectare, water table drops by 4m. If the porosity is 0.35 and the specific retention if 0.15, change in volume of storage in the aquifer is |
| A. | 160 m |
| B. | 1.6 106 m |
| C. | 8 106 m |
| D. | 1.6 103 m |
| Answer» C. 8 106 m | |
| 19. |
A 1-h rainfall of 10 cm magnitude at a station has a return period of 50 years. The probability that a 1-h rainfall of magnitude 10 cm or more will occur in each of two successive years is: |
| A. | 0.04 |
| B. | 0.2 |
| C. | 0.02 |
| D. | 0.0004 |
| Answer» E. | |
| 20. |
The average rainfall for a 3 hour duration storm is 2.7 cm and the loss rate is 0.3 cm/hr. The flood hydrograph has a base flow of 20 m /s and produces a peak flow of 210 m /s. The peak of a 3-h unit hydrograph is |
| A. | 125.50 m /s |
| B. | 105.50 m /s |
| C. | 77.77 m /s |
| D. | 70.37 m /s |
| Answer» C. 77.77 m /s | |
| 21. |
An isolated 3-h rainfall event on a small catchment produces a hydrograph peak and point of inflection on the falling limb of the hygrograph at 7 hours and 8.5 hours respectively, after the start of the rainfall. Assuming, no losses and no base flow contribution, the time of concentration (in hours) for this catchment is approximately |
| A. | 8.5 |
| B. | 7.0 |
| C. | 6.5 |
| D. | 5.5 |
| Answer» E. | |
| 22. |
When the outflow from a storage reservoir is uncontrolled as in a freely operating spillway, the peak of outflow hydrograph occurs at |
| A. | at point of inter-section of the inflow and outflow hydrographs |
| B. | a pount, after the inter-section of the inflow and outflow hydrographs |
| C. | the tail of inflow hydrographs |
| D. | a point, before the inter-section of the inflow and outflow hydrographs |
| Answer» D. a point, before the inter-section of the inflow and outflow hydrographs | |
| 23. |
While applying the Rational formula for computing the design discharge, the rainfall duration is stipulated as the time of concentraiton because. |
| A. | this leads to the largest possible rainfall intensity. |
| B. | this leads to the smallest possible rainfall intensity |
| C. | the time of concentraiton is the smallest rainfall duration for which the Rational formula is applicable. |
| D. | the time of concentration is the largest rainfall duration for which the Rational formula is applicable. |
| Answer» B. this leads to the smallest possible rainfall intensity | |
| 24. |
Water is pumped from a well tapping an unconfined aquifer at a certain discharge rate and the steady stae drawdown (X) in an observation well is monitored. Subsequently, the pumping discharge is doubled and the steady state drawdown in the same observation well is found to be more than double (i.e., more than 2X). This disproportionate drawdown is caused by |
| A. | well losses |
| B. | decrease in the saturated thickness of the aquifer |
| C. | nonlinear flow |
| D. | delayed gravity yield |
| Answer» D. delayed gravity yield | |
| 25. |
When there is an increase in the atomospheric pressure, the water level in a well penetrating in a confined aquifer |
| A. | increases |
| B. | decreases |
| C. | may increase or decrease depending on the nature of the aquifer |
| D. | does not undergo any change |
| Answer» C. may increase or decrease depending on the nature of the aquifer | |
| 26. |
The rainfall during three successive 2 hour periods are 0.5, 2.8 and 1.6 cm. The surface runoff resulting from this storm in 3.2 cm. The f index value of the storm is |
| A. | 0.20 cm/hr |
| B. | 0.27 cm/hr |
| C. | 0.30 cm/hr |
| D. | 0.80 cm/hr |
| Answer» D. 0.80 cm/hr | |
| 27. |
During a 3-hour storm event, it was observed that all abstractions other than infiltration are negligible. The rainfall was idealized as 3 one hour storms of intensity 10 mm/hr, 20 mm/hr and 10 mm/hr respectively and the infiltration was idealized as a Horton curve, f = 6.8 + 8.7 exp ( t) (f in mm/hr and t in hr). What is the effective rainfall ? |
| A. | 10.00 mm |
| B. | 11.33 mm |
| C. | 12.43 mm |
| D. | 13.63 mm |
| Answer» E. | |
| 28. |
What will be the ordinate of a 2-hour unit hydrograph for this catchment at t = 3 hours ? |
| A. | 0.13 m /s |
| B. | 0.20 m /s |
| C. | 0.27 m /s |
| D. | 0.54 m /s |
| Answer» D. 0.54 m /s | |
| 29. |
What is the area of the catchment ? |
| A. | 0.01 km |
| B. | 0.36 km |
| C. | 1.00 km |
| D. | 1.28 km |
| Answer» C. 1.00 km | |
| 30. |
The peak flood discharge due to the storm is |
| A. | 210 m /s |
| B. | 230 m /s |
| C. | 260 m /s |
| D. | 720 m /s |
| Answer» B. 230 m /s | |
| 31. |
The average surface area of a reservoir in the month of June is 20 km . In the same month, the average rate of inflow is 10 m /s, outflow rate is 15 m /s, monthly rainfall is 10 cm, monthly seepage loss is 1.8 cm and the storage change is 16 million m . The evaporation (in cm) in that month is: |
| A. | 46.8 |
| B. | 136.0 |
| C. | 13.6 |
| D. | 23.4 |
| Answer» C. 13.6 | |
| 32. |
Isopleths are lines on a map through points having equal depth of |
| A. | Rainfall |
| B. | Infiltration |
| C. | Evapotranspiration |
| D. | Total runoff |
| Answer» D. Total runoff | |
| 33. |
Group I contains parameters and Group II lists methods/instruments. |
| A. | P-1, Q-2, R-3, S-4 |
| B. | P-4, Q-3, R-2, S-1 |
| C. | P-4, Q-2, R-3, S-1 |
| D. | P-1, Q-3, R-2, S-4 |
| Answer» D. P-1, Q-3, R-2, S-4 | |
| 34. |
A watershed got transformed from rural to urban over a period of time. The effect of urbanization on storm runoff hydrograph from the watershed is to |
| A. | decrease the volume of runoff |
| B. | increase the time to peak discharge |
| C. | decrease the time base |
| D. | decrease the peak discharge |
| Answer» D. decrease the peak discharge | |
| 35. |
The correct match of Group I with Group II is |
| A. | P-1, Q-3, R-4, S-2 |
| B. | P-1, Q-4, R-2, S-3 |
| C. | P-3, Q-4, R-1, S-2 |
| D. | P-4, Q-2, R-1, S-3 |
| Answer» C. P-3, Q-4, R-1, S-2 | |
| 36. |
A flood wave with a known inflow hydrograph is routed through a large reservoir. The outflow hydrograph will have |
| A. | attenuated peak with reduced time-base |
| B. | attenuated peak with increased time-base |
| C. | increased peak with increased time-base |
| D. | increased peak with reduced time-base |
| Answer» C. increased peak with increased time-base | |
| 37. |
The plan area of a reservoir is 1 km . The water level in the reservoir is observed to decline by 20 cm in a certain period. During this perod the reservoir receives a surface inflow of 10 hectare-meters, and 20 hectare-meters are abstracted from the reservoir for irrigation and power. The pan evaporation and rainfall recorded during the same period at a near by meteorological station are 12 cm and 3 cm respectively. The calibrated pan factor is 0.7. The seepage has from the reservoir during this period in hectare-meters is |
| A. | 0.0 |
| B. | 1.0 |
| C. | 2.4 |
| D. | 4.6 |
| Answer» E. | |
| 38. |
During a 6-hour storm, the rainfall intensity was 0.8 cm/hour on a catchment of area 8.6 km . The measured runoff volume during this period was 2,56,000 m . The total rainfall was lost due to infiltration, evaporation, and transpiration (in cm/hour) is |
| A. | 0.80 |
| B. | 0.304 |
| C. | 0.496 |
| D. | sufficient information not available |
| Answer» C. 0.496 | |
| 39. |
Two observation wells penetrated into a confined acquifer and located 1.5 km apart in the direction of flow, indicate head of 45 m and 20m. If the coefficient of permeability of the acquifer is 30m/day and porosity is 0.25, the time of travel of an inert tracer from one well to another is |
| A. | 416.7 days |
| B. | 500 days |
| C. | 750 days |
| D. | 3000 days |
| Answer» D. 3000 days | |
| 40. |
The intensity of rain fall and the time interval of a typical storm are |
| A. | 1.5 mm/minute |
| B. | 1.85 mm/minute |
| C. | 2.2 mm/minute |
| D. | 3.7 mm/minute |
| Answer» C. 2.2 mm/minute | |
| 41. |
The intensity of storm II (in cm/h) is |
| A. | 2.00 |
| B. | 1.75 |
| C. | 1.50 |
| D. | 2.25 |
| Answer» E. | |
| 42. |
The -index (in cm/h) is |
| A. | 1.2 |
| B. | 1.0 |
| C. | 1.6 |
| D. | 1.4 |
| Answer» B. 1.0 | |
| 43. |
For a storm of depth of 5.5 cm and duration of 1 hour, the peak ordinate (in m /s) of the hydrograph is |
| A. | 55.00 |
| B. | 82.60 |
| C. | 92.60 |
| D. | 102.60 |
| Answer» D. 102.60 | |
| 44. |
The peak ordinate (in m /s/cm) of the unit hydrograph is |
| A. | 10.00 |
| B. | 18.52 |
| C. | 37.03 |
| D. | 185.20 |
| Answer» C. 37.03 | |
| 45. |
Ordinate of a 3-hour unit hydrograph for the catchment at t = 3 hours is |
| A. | 2.0 m /s |
| B. | 3.0 m /s |
| C. | 4.0 m /s |
| D. | 5.0 m /s |
| Answer» D. 5.0 m /s | |
| 46. |
The rainfall on five successive days in a catchment were measured as 3, 8, 12, 6 and 2 cms. If the total runoff at the outlet from the catchment was 15 cm, the value of the findex (in mm/hour) is |
| A. | 0.0 |
| B. | 1.04 |
| C. | 1.53 |
| D. | sufficient information not available |
| Answer» C. 1.53 | |
| 47. |
A 6-hour Unit Hydrograph (UH) of a catchment is triangular in shape with a total time base of 36 hours and a peak discharge of 18 m /s. The area of the catchment (in sq. km) is |
| A. | 233 |
| B. | 117 |
| C. | 1.2 |
| D. | Sufficient information not available |
| Answer» C. 1.2 | |
| 48. |
Group I lists a few devices while Group II provides information about their uses. Match the devices with their corresponding use. |
| A. | P - 1; Q - 2; R - 3; S - 4 |
| B. | P - 2; Q - 1; R - 4; S - 3 |
| C. | P - 4; Q - 2; R - 1; S - 3 |
| D. | P - 4; Q - 3; R - 2; S - 1 |
| Answer» E. | |
| 49. |
In a catchment, there are four rain gauge stations, P,Q,R, and S. Normal annual precipitation values at these stations are 780 mm, 850 mm, 920 mm, and 980 mm, respectively. In the year 2013, stations Q,R, and S, were operative but P was not. Using the normal ratio method, the precipitation at station P for the year 2013 has been estimated as 860 mm. If the observed precipitation at stations Q and R for the year 2013 were 930 mm and 1010 mm, respectively, what was the observed precipitation (in mm) at station S for that year? |
| A. | 1256.20 mm |
| B. | 1076.20 mm |
| C. | 982 mm |
| D. | 1000 mm |
| Answer» C. 982 mm | |