Surveying Questions and Answers - Well Conditioned Triangle

1. The difference between a measurement and the true value of the quantity measured is _____
a) True error
b) Discrepancy
c) Limit of error
d) Accuracy

Answer: a
Explanation: The difference between a measurement and the true value of the quantity measured is the true error of the measurement. The important function of a surveyor is to secure measurements that are correct within a certain limit of error prescribed by the nature and purpose of a particular survey.

2. The difference between the two measured values of the same quantity is ______
a) Precision
b) Accuracy
c) Discrepancy
d) Error

Answer: c
Explanation: A discrepancy is a difference between two measured values of the same quantity. A discrepancy may be small, yet the error may be great if each of the two measurements contains an error that may be large.

3. Which of the following are not sources of errors?
a) Instrumental
b) Personal
c) Natural
d) Artificial

Answer: d
Explanation: Error may arise from three sources namely instrumental, personal and natural.

4. A tape may be too long or an angle measuring instrument may be out of adjustment. Then such type of error comes under which source of error?
a) Instrumental
b) Personal
c) Natural
d) Artificial

Answer: a
Explanation: Error may arise due to imperfection or faulty adjustment of the instrument with which measurement is being taken comes under an instrumental source of error.

5. Investigation of observations of various types shows that accidental errors follow a definite law. This law is called ______
a) Law of probability
b) Law of recurrence
c) Law of precise
d) Law of accuracy

Answer: a
Explanation: This law defines the occurrence of errors and can be expressed in the form of the equation which is used to compute the probable value or the probable precision of a quantity. This is also termed as a theory of probability.

6. A line which joins subsidiary stations on the main line is called _____
a) Tie line
b) Survey lines
c) Base lines
d) Check lines

Answer: a
Explanation: Check lines or proof lines are the lines which are run in the field to check the accuracy of the work. A Tie line is a line which joins subsidiary or tie stations on the main line.

7. In which type of surveying only linear measurements are made?
a) Contouring
b) Chain surveying
c) Theodolite surveying
d) Dumpy level

Answer: b
Explanation: Chain surveying is the type of surveying in which only linear measurements are made in the field. This type of surveying is suitable for surveys of small extent on open take simple details.

8. A survey station is prominent on the chain line and can be either at the beginning of the chain or at the end. Such stations are known as ______
a) Main station
b) Tie station
c) Subsidiary station
d) Intermediate station

Answer: a
Explanation: However, subsidiary or tie station can also be selected anywhere on the chain line and subsidiary or tie lines may be run through them. A survey station is prominent on the chain line and can be either at the beginning of the chain or at the end. Such stations are known as the main station.

9. What is laid by joining the apex of the triangle to any point on the opposite side or by joining two points on any two sides of a triangle?
a) Check line
b) Base line
c) Tie line
d) Survey line

Answer: a
Explanation: Check line is laid by joining the apex of the triangle to any point on the opposite side or by joining two points on any two sides of a triangle. Each triangle must have a check line.

10. The accuracy in the location of the objects depends upon the accuracy in laying the ________
a) Check line
b) Base line
c) Tie line
d) Survey line

Answer: a
Explanation: Tie line is a line which joins subsidiary or tie stations on the main line. The accuracy in the location of the objects depends upon the accuracy in laying the tie line.