Natural error occur in surveying by
-
Solution
Natural Error This type of error is introduced by the natural change like temperature, humidity gravity etc. resulting in change in an accuracy of the instruments.
Pedometer is used for
Length of offset rod is
Diameter of optical square is about
-
Solution
Optical Square It is more accurate than the cross staff and it can be used for locating objects situated at larger distances. It is small and compact hand instrument and works on the principle of reflection. This is used for setting out perpendiculars to a point on a survey time. A metal cover is also provided to protect it from dust, moisture etc.
Which of the following is type of ranging?
Peg is made of
-
Solution
Peg It is made of wood. It is used to mark the stations. The peg is about 15 cm long and 2.5 x 2 .5 cm in cross section. It is driven in the ground by a hammer.
Which of the following is type of tape?
An optical square is used to
The normal height of a range rod is
-
Solution
Range Rod Ranging rods are used for ranging lines and to mark stations which must be seen from a long distance. They are made of light, strong and thin bamboo seasoned wood or mild steel rods. The rod is alternately painted white, black and red. The length of a ranging rod is usually 2 to 3 m.
Which of the following is not a chain?
-
Solution
Arrow It is used to mark the end of the chain or tape during linear measurement. It is made of metallic wire or a thin rod. It is pointed at one end for fixing on the ground and a loop is provided at the top for holding it.