The size of peg is 

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HSSC JE Civil 10 April 2018 Shift 1
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  1. 2.5 cm square and 15 cm long
  2. 3.5 cm square and 10 cm long
  3. 4.5 cm square and 15 cm long
  4. 4 cm square and 10 cm long

Answer (Detailed Solution Below)

Option 1 : 2.5 cm square and 15 cm long
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Detailed Solution

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Explanation:

The instruments used in chaining in surveying are as follows:

1. Peg: 

  • The pegs are generally manufactured of hard timber. One end of the peg is flat and the other edge is pointed.
  • The wooden pegs are generally 2.5 cm x 2.5 cm in cross-section and 15-90 cm long.
  • The pegs should be firmly driven into the ground such that only 4 cm of the peg is projecting above the ground.

2. Plumb bob:

  • Plumb bob is one of the instruments used in chain surveying. Plumb bob is made of steel. It is conical in shape.
  •  A plumb bob is used for transferring the points to the ground in case of chaining along a slope.

3. Ranging rods:

  • The ranging rods are generally manufactured of steel tubular rods. Sometimes these are made of well-seasoned timber or seasoned bamboo.
  • The ranging rods are generally 25 mm in diameter and 2 m in length.
  • The ranging rods are divided into bands of 20  cm by painting them black and white or red and white alternately.
  • An iron-shoe of 15 mm length is provided at the lower end.

4. Arrows:

  • The arrows are manufactured from hardened and tempered steel wire of 4 mm diameter.
  • The length of the arrow is kept at 40 cm. one end of the arrow is pointed while at the other end a 5cm diameter ring is formed.
  • This ring is formed to facilitate carrying the arrows from one station to another.

5. Chain:

  • Chains are the main instruments used in chain surveying. The chains are generally formed with galvanized mild-steel wire. 
  • In general, there are 4 types of chains are used in surveying:
    • Metric chain;
    • Surveyors chain or Gunter’s chain;
    • Engineers chain;
    • Revenue Chain.

6. Tapes:

  • Among the instruments used in chain surveying for measuring distance, tapes are more accurate than chains.
  • Tapes are manufactured of various materials. Tapes are classified into four types;
    • Linen or cloth tape;
    • Metallic tape;
    • Steel tape;
    • Invar tape.
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