1. In Laser survey what is the replacement for invisible line of sight of ordinary survey instruments?
a) Bright Red beam of Laser
b) Invisible beam of Laser
c) Magnetic waves
d) Sound Waves
Explanation: Laser beam has a property of low diversion. This is used for alignment purposes for the new rail line. It emits a bright red beam which hits the light sensitive cells on the target and distance between them is obtained.
2. By using Laser in Surveying distances up to 70km can be measured.
a) true
b) false
Explanation: A bright red beam is emitted from the laser which can travel large distances. The beam travels in perfectly straight line, thus chance of mistake is very less. This light amplification can measure distances up to 70km.
3. What major points should be included in the Project report for a Reconnaissance survey?
a) Total cost estimate
b) Whether it’s feasible to carry the project further or not
c) Total cost estimate, feasibility of the project and Map of the area
d) Total cost estimate and feasibility of the project
Explanation: The project engineer should make the report which should contain the cost estimate of the project and a small map of the area. It should also tell whether the project should be continued or not based on a financial point of view.
4. What is the objective of Preliminary survey?
a) To estimate the cost of the proposed railway line
b) To study the traffic flow
c) To decide the alignment based on the trade links
d) To choose proper gauge
Explanation: Preliminary survey is done to determine the cost of the rail line to be constructed. Traffic survey is done to study the traffic the train will carry and various alignments are analysed in Reconnaissance survey.
5. What is done to estimate the cost of the rail line to be constructed in Preliminary survey?
a) Instrumental examination of the route to be selected
b) Study the topography with the help of maps
c) Meeting with local bodies and prominent people
d) Cost is estimated based on different lines of similar alignments
Explanation: The survey team estimates the cost of the new line by calculations based on the readings of the instrumental survey. Based on the reports of Reconnaissance survey and Preliminary survey the railway administration then decides whether to construct the new line or not.
6. Why is Theodolite used for Preliminary survey?
a) For measuring magnetic bearings of alignments
b) For traversing the centre line
c) For pegging the centre line
d) For both traversing and pegging the centre line
Explanation: With the help of theodolite horizontal and vertical angles can be measured. In field it is used for Traversing and pegging the centre line. Magnetic bearing is measured with the help of prismatic compass.
7. What is the use of Tacheometer in Preliminary survey??
a) For taking longitudinal and cross levels
b) For plotting main features
c) For pegging the centre line
d) For getting details of various features
Explanation: For taking longitudinal and cross levels dumpy level is used. Plane table is used for getting details of various features and tacheometer is used for plotting main features.
8. The survey done on site usually covers a width of 200m on either side of the alignment.
a) true
b) false
Explanation: While doing survey on site longitudinal and cross levelling is also done 200m on either side of the alignment. This is to ensure high accuracy of the contour maps.
9. Which among the following is not a part of the report prepared after Preliminary survey?
a) Characteristics of project area
b) Route selection
c) Standard of Construction
d) Population projection and volume projection of Traffic
Explanation: After the Preliminary survey a report is prepared which contains the cost estimate of the project. It should also contain the Characteristics of the project area, Standard of Construction, Route selection and Conclusions and recommendations. Population projection and volume projection is a part of Traffic survey.
10. When is the Final Location survey done?
a) After the particular Railway line to be constructed is decided
b) After the Traffic survey
c) After Reconnaissance survey
d) Immediately after the collection of Field data
Explanation: Once the route of the new line to be constructed is decided, final location survey is done. It is done with the help of same instruments used in Preliminary survey.