Surveying Questions (S5)

In this post, I will share some important questions which are frequently asked in competitive examinations such as SSC, UPSC and state PSCs.

1. Where "0" is engraved in a Prismatic Compass?

   
   

   1. North
   2. South
   3. East
   4. West

   View Answer

   Answer: b



2. Which of the following is correct regarding Prismatic Compass?

   
   

   1. East and West are interchanged
   2. The reading is taken through the top of the glass
   3. Sighting and reading taking can be done simultaneously
   4. The Graduated Card is attached to the box

   View Answer

   Answer: c
   Except for option (c) all the options are correct for a Surveyor's Compass.



3. A line drawn through points of same magnetic declination is called _____.

   
   

   1. Isogonic
   2. Agonic
   3. Isobar
   4. None of the above

   View Answer

   Answer: a
   Agonic lines show points of zero Magnetic declination and Isobar shows points of same pressure.



4. Which of the following statement is correct about Diurnal Variation?

   
   

   1. It is less at the Equator
   2. Considerably more in summer
   3. More in days
   4. All of the above

   View Answer

   Answer: d



5. The advantage of True Bearing over Magnetic Bearing is ...

   
   

   1. It does not vary with time
   2. It is easier to take
   3. Local Attraction has no effect on it
   4. Both (a) and (c)

   View Answer

   Answer: d



6. The Magnetic bearing of a line is $48^\circ 24'$. What will be the true bearing if the magnetic declination is $5^\circ 38' E$?

   
   

   1. $42^\circ 46'$
   2. $54^\circ 2'$
   3. $53^\circ 38'$
   4. $42^\circ 24'$

   View Answer

   Answer: b
   Since the declination is on East, TB = MB + Decliation



7. What is the Magnetic declination at a place if the magnetic bearing of the sun at noon is $350^\circ 20'$.

   
   

   1. $9^\circ 40' E$
   2. $9^\circ 40' W$
   3. $10^\circ 20' E$
   4. $10^\circ 20' W$

   View Answer

   Answer: a
   Since the magnetic bearing of the sun is $350^\circ 20'$, it is at the North of the place and hence the True bearing of the sun, which is on the meridian, will be $360^\circ$.
   Therefore, $TB=MB+Declination$
   $Declination = 360^\circ - 350^\circ 20' = 9^\circ 40' E$



8. Select the incorrect statement.

   
   

   1. Wires carrying electric current can cause Local Attraction
   2. If the difference between FB and BB of a line is not $180^\circ$, it may be due to Local Attraction.
   3. Local Attraction has no effect on True Bearing.
   4. None of the above

   View Answer

   Answer: d



9. The following Bearing was observed while traversing with a compass

   
   

   Line	FB	BB
   AB	$124^\circ 30'$	$304^\circ 30'$
   BC	$68^\circ 15'$	$246^\circ$
   CD	$310^\circ 30'$	$135^\circ 15'$
   DA	$200^\circ 15'$	$17^\circ 45'$

   
   

   Which stations had affected by local attration?

   
   

   1. Station A and B
   2. Station A and C
   3. Station C and D
   4. Station B, C and D

   View Answer

   Answer: c
   FB and BB of line AB differ by $180^\circ$, Therefore Stations A and B are free from Local Attraction.



10. What is Trunnion axis?

    
    

    1. Horizontal axis of Theodolite
    2. Vertical axis of Theodolite
    3. Axis of Line of sight of Theodolite
    4. Axis of Bubble tube

    View Answer

    Answer: a



11. Select the incorrect Statement.

    
    

    1. A transit theodolite can be rotated $180^\circ$ in its vertical plane
    2. When the bubble of the telescope is up, Telescope is said to be direct.
    3. If the vertical circle is to the left of the observer, the observation is called face left observation.
    4. The vertical axis is the axis about which vertical circle rotates.

    View Answer

    Answer: d
    The vertical axis is the axis about which the instrument rotates.



12. Which of the following is used to test the horizontality of the trunnion axis?

    
    

    1. Plate Level
    2. Compass
    3. Striding Level
    4. Index Frame

    View Answer

    Answer: c



13. The inner spindle carries the _______.

    
    

    1. Upper Plate
    2. Lower Plate
    3. Scale Plate
    4. Vertical Circle

    View Answer

    Answer: a
    The inner spindle carries the upper plate and outer spindle carries the lower plate.



14. If a relative motion between the vernier and the scale is desired, which of the following is adopted?

    
    

    1. Clamp both lower and upper plate
    2. Clamp lower plate only
    3. Clamp upper plate only
    4. Unclamp both plates

    View Answer

    Answer: b
    If the lower clamp is clamped and upper clamp is unclamped, the upper plate and the instrument can rotate on the inner axis with a relative motion between the vernier and the scale.

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