641. Ground water moving down wards in the un-saturated ground above the water table is called___________________?

A. Hygroscopic water
B. Capillary water
C. Gravity water
D. All are correct

642. To protect the face of embankment against the attack of wave wash with stone boulders is called _________________?

A. Pitching
B. Armouring
C. Revetment
D. All are correct

643. The mass per unit volume of a liquid at standard temperature and pressure is called ____________________?

A. Specific weight
B. Specific gravity
C. Mass density
D. None of these

644. The experiment of capillary rise is performed in a glass tube of smaller diameter, because___________________?

A. It is easily visible
B. Glass tube is cheaper than metal
C. Glass tube is lighter than metallic tube
D. Capillary rise is significant

645. The mercury in a glass tube assumes convex shape at the top because of_________________________?

A. Cohesion
B. Adhesion
C. Surface Tension
D. Viscosity

646. The property of liquid which controls its rate of flow is called __________________?

A. Capillarity
B. Compressibility
C. Viscosity
D. Specific gravity

647. _________% of total global water is fresh and its major portion is obtained from Rains ?

A. 2%
B. 2.5%
C. 3%
D. 3.2%

648. The property of soil which indicates the volume of water stored in the formation is called ___________________?

A. Specific yield
B. Porosity
C. Field capacity
D. Specific retention

649. The property of saturated soil mass which transmits appreciable quantities . water is called___________________?

A. Porosity
B. Transmissibility
C. Permeability
D. Discharge

650. The discharge of a well per unit draw down usually expressed as gallons or liters per minute is called ____________________?

A. Discharge
B. Specific volume
C. Specific capacity
D. All are correct