is less.accurate than height of instrument method

is not suitable for levelling with tilting levels

provides a check on the reduction of intermediate point levels

quicker and less tedious for large number of intermediate sights

true R.L.

more than true R.L.

less than true R.L.

none of the above

level line is a curved line while hori-zontal line is a straight line

level line is normal to plumb line while horizontal line may not be normal to plumb line at thetangent point to level line

horizontal line is normal to plumb line while level line may not be normal to the plumb line

both are same

increasing the diameter of the tube

decreasing the length of bubble

increasing the viscosity of liquid

decreasing the radius of curvature of tube

decreases

increases

remains unaffected

none of the above