In land surveying:
A Gunter's chain (also known as a surveyor's chain) has a total length of 66 feet and is divided into 100 links.
Length of each link = \(\frac{66\text{ ft}}{100} = 0.66\text{ ft} = 7.92\text{ inches}\).
An area of 10 square chains (\(10 \times 66 \times 66\text{ sq ft} = 43,560\text{ sq ft}\)) equals exactly 1 acre, making it historically convenient for land acreage measurement.

In land shaping and agricultural water management:
Statement (I) is correct: In unirrigated / rainfed lands, land grading is systematically practiced to ensure uniform spreading of runoff, prevent localized ponding or scouring, increase infiltration opportunity time, and maximize in-situ soil moisture conservation.
Statement (II) is correct: Land levelling consists of rough grading (clearing and bulk earth moving using scrapers/bulldozers) followed by land smoothing (using wooden floats or land planes) as the final finishing operation to eliminate minor surface irregularities, clods, and scraper ruts.

In land preparation and leveling:
A wooden float (or land plane) is a long, sled-like wooden framework (typically 4.5 to 9 meters long) equipped with cutting blades.
As it is pulled across the field, the long wheelbase spans over depressions; high spots are sheared off and the loose soil is deposited automatically into small depressions.
This makes the float the most effective and universally recommended wooden equipment specifically for the land smoothing (finishing) operation.
Buck scrapers and U-levellers are earth-moving implements used for scraping and transporting soil over moderate distances, not fine smoothening.

In land levelling and earthwork engineering:
When soil is excavated from cut areas and compacted into fill depressions, it undergoes consolidation and shrinkage, losing pore space compared to its undisturbed state.
To achieve balanced earthwork where the excavated volume is sufficient to fill all depressions, the designed cut-fill ratio (\(\text{Volume of Cut} / \text{Volume of Fill}\)) must always be greater than 1 (typically designed between 1.1 and 1.5, or 110% to 150%, depending on soil compaction and organic matter).