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Q: In a plane survey, the length of an arc 12 km long lying on the earth's surface is____greater than the subtended chord.
  • A. 0.1 cm
  • B. 1 cm
  • C. 100 cm
  • D. 10 cm
Correct Answer: Option B - Plane surveying–In plane surveying, mean surface of the earth is considered as a plane and the spheroidal shape is neglected. • In this case all triangle formed by survey line are considered plane triangles. • In this condition, the length of an arc 12 km long lying in the earth's surface is only 1 cm greater than the subtended chord. • In case spherical triangle it is only one second for a triangle at the earth's surface having an area of 195 sq.km. • No of links for 20 m chain is 100 links and for 30 m is 150 links.
B. Plane surveying–In plane surveying, mean surface of the earth is considered as a plane and the spheroidal shape is neglected. • In this case all triangle formed by survey line are considered plane triangles. • In this condition, the length of an arc 12 km long lying in the earth's surface is only 1 cm greater than the subtended chord. • In case spherical triangle it is only one second for a triangle at the earth's surface having an area of 195 sq.km. • No of links for 20 m chain is 100 links and for 30 m is 150 links.

Explanations:

Plane surveying–In plane surveying, mean surface of the earth is considered as a plane and the spheroidal shape is neglected. • In this case all triangle formed by survey line are considered plane triangles. • In this condition, the length of an arc 12 km long lying in the earth's surface is only 1 cm greater than the subtended chord. • In case spherical triangle it is only one second for a triangle at the earth's surface having an area of 195 sq.km. • No of links for 20 m chain is 100 links and for 30 m is 150 links.