HOW 2021 AGRICULTURAL NECO SPECIMENS WILL COME OUT

HOW 2021 AGRICULTURAL NECO SPECIMENS WILL COME OUT

Proper Identification of the Specimens

All about specimen A-D

Specimen A-C are all Surveying Instruments

Specimen A – Measuring Tape

Description
  1. It is usually made of linen or fine steel sheet.
  2. It is usually marked on one side with metric units and the other side with the imperial unit.
  3. The Measuring Tape is of various types and lengths.
  4. The Measuring Tape is normally wound in a small case from where it is unwound for use.
Function/Use
  • It is used in taking short or detailed measurement of length, breath and height.

Specimen B – Gunter’s Chain

Description
  1. It consists of a series of dumb bell shaped links of steel wires joined together by three small rings.
  2. One Gunter’s Chain is normally 20.13m (66ft) in length.
  3. It has brass handles at either side.
  4. It is divided into 100 links so that each link is 19.8cm or 7.92ins.
  5. A link is the distance from the middle of the central ring to the middle of the next central ring.
  6. The chain is entirely metallic.
Function/Use
  • To serve as a distance measuring device used for land survey.

Specimen C – Ranging Pole

Description
  1. Ranging Pole is made of wood or metal.
  2. It is of varying lengths e.g., 1.8m, 2.4m or 3.0m
  3. It is generally circular in section, through some octagonal types are obtainable.
  4. It is usually painted black, bright red and white to enable it to be seen from a distance.
  5. It has a pointed end.
Function/Use
  • It is used for marking stations.
  • It is also used for making straight lines.

Specimen D – Peg (Also know as Arrow or Pin)

Description
  1. This is thin pointed steel wires of about 30cm long with one end curved into a ring.
  2. A red cloth is normally attached to the ring so that it can be seen from afar.
Function/Uses
  • It is used during chaining for marking off chain lengths as measured.
  • It can also be used for marking stations.

Maintenance of those Surveying Instruments.

  1. They must be cleaned after use.
  2. Keep instruments in dry and cool places.
  3. Those metal parts should be oiled or greased or painted before they are put away for a long time.
  4. Replace worn-out parts.
  5. Keep instruments away from heat and rain to prevent damage and rusting respectively.

Take note of this

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