SSC JE 2019-20: Surveying Quiz-6

A 20 m chain was found to be 20 cm too long after chaining a distance of 2500 m. It was found to be 28 cm too long at the end of the day’s work after chaining a total distance of 4000 m. What is the true distance (in m, correct to one decimal digit) if the chain was correct before the commencement of the day’s work?

If the area calculated by chain is found to be 0.6 link too long is 140 acres then the true area (in acres)

Calculate the temperature correction for a tape if the tape was standardized at 25°C Assume that the observation was recorded at 30°C and coefficient of thermal expansion of the tape is 1.2 × 10^–5 per ˚C and standard length of the tape is 20 m.

A survey line cuts the river on the opposite bank at A and B. To measure the distance AB a point C is taken on the same side of river as A. two offsets AD and CE are erected perpendicular to AB on A and C respectively such that B, D and E are ranged on a single line. Determine the width of river if AD = 125m, CE = 150 m and AC = 100 m.

A chain was designated to be 30 m long was found to be 0.2 m too long. If the measured length of chain is 354.89 m, what will be the true length

Match list 1 with list 2 and select the answers using the codes given below.

List-I

(a) Main survey line

(b) Tie line

(c) Base line

(d) Proof line

List-II

i. Passer through centre of area

ii. Used to locate the interior details

iii. liner joining the boundary points of the area

iv. To check accuracy of the field work

What is the maximum tolerance for a 20 m chain

Reconnaissance in the survey refers to