Survey (1-20)

1. Which of the following scales is largest one? (1 cm = 50 m, 1:42000, 1:300000, 1 cm = 50 km)- 1 cm = 50 m

Sol.

1 cm = 50 m(Statement) ⇒ 1 cm = 50 X 100 cm = 1:5000 (Representative Fraction)

1:42000

1:300000

1 cm = 50 Km ⇒ 1 cm = 50 X 100000 cm = 1:5000000

Remember- Scale को दो तरीको से repersent किया जाता है

1. Statement 2.Representative Fraction

e.g. 1:5000 or 1/5000 यहाँ numerator 1 है और denominator 5000 Scale बड़ा होने का मतलब denominator छोटा हैं । यहाँ 1:5000 सबसे बड़ा scale है।

2. If the probable error in single observation is ±0.04 m and that of the mean is ±0.01 m, then the number of observations are- 16

3. Theory of probability is applied to- accidental errors only

4. A survey is conducted with a view to prepare the map of an area to a scale of 1 : 1000. If a scale with least count of 0.1 mm is used for plotting, what would be the

accuracy in length measurement in the field ?-0.1 m

5. The difference between the most probable value of a quantity and its observed value is- residual error

6. Geodetic surveying is different from plane surveying because of-the curvature of the earth

7. The error due to bad ranging is-cumulative; positive

8. 'Offsets' are-short measurements from chain line-short measurements from chain line

9. Which of the following instruments is generally used for base line measurements?-invar tape

10. An invar tape is made of an alloy of- nickel and steel

11. Number of links in a 30 m metric chain is- 150

12. 'Ranging' is the process of-aligning the chain in a straight line between two extremities

13. The principle of'working from whole to part' is used in surveying because

accumulation of errors is prevented

14. Figure shows one of the brass tallies of a 30 m chain. Distance of this tally from the nearest end of the chain is

10 m

15. During chaining along a straight line, the leader of the party has 4 arrows in his hand while the follower has 6. Distance of the follower from the starting point is-

6 chains

16. A metallic tape is made of-cloth and wires

17. For a well-conditioned triangle, no angle should be less than-30°

18. Figure 2.2 shows the entries in a field book for a chain line AB.What is the angle between chain line and railway line ?

45°

19. What is the distance between trees T1 and T2 shown in Figure 2.2 ?

5 m

20. The position of a point can be fixed more accurately by- perpendicular offsets