To determine the discharge at a section in a stream from its rating curve, the required data are_______________?

To determine the discharge at a section in a stream from its rating curve, the required data are_______________?

1) slope of water surface at the section
2) stage at the section
3) current meter readings at the section

The correct answer is?
A. (1) and (2)
B. (2) and (3)
C. only (2)
D. only (3)

The forces, which are considered for the analysis of an elementary profile of a gravity dam under empty reservoir condition, are________________?

The forces, which are considered for the analysis of an elementary profile of a gravity dam under empty reservoir condition, are________________?

1) Water pressure
2) Self weight
3) Uplift
4) Pressure due to earthquake

The correct answer is
A. Only (2)
B. (1), (2) and (3)
C. (1), (2) and (4)
D. (1), (2), (3) and (4)

Rate of evaporation from a water surface increases if_________________?

Rate of evaporation from a water surface increases if_________________?

1) difference of vapour pressure between water and air is increased
2) velocity of wind is decreased
3) concentration of soluble solids in water is decreased

The correct answer is?
A. (1) and (i2)
B. (2) and (3)
C. (2) and (3)
D. (1), (2) and (3)