Surveying Questions (S3)

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



  1. The true length of a chain is known to be 500 m. The line was again measured with a 20 m tape and found to be 502 m. What is the correct length of the 20 m tape?


    1. 19.92 m
    2. 20.80 m
    3. 20.36 m
    4. 19.86 m

    View Answer
    Answer: a
    Since the true length (TL) is 500 m and Measured Length (ML) is 502 m. The correction required for the tape is negative.
    Number of 20 m tapes required to measure 500 m = 500/20 = 25
    That means the extra 2 m is accumulated in 25 settings of 20 m tape
    Therefore, Extra Length measured during each setting = 20/25 = 0.08 m

    The correct Length of 20 m tape = 20 - 0.08 = 19.92 m

    Or one can use the following formula

    $TL=ML\frac{\text{Correct Length of Tape}}{\text{Original length of Tape}}$

  2. The length of a line measured with a 20 m chain was found to be 250 m. What is the true length of the line if the chain was 10 cm too long?


    1. 248.75 m
    2. 250.25 m
    3. 251.25 m
    4. 252.75 m

    View Answer
    Answer: c
    Since the chain is too long correction must be positive
    Number of chain settings = 250/20 = 12.5
    Therefore, corection = 12.5 * 10 cm = 125 cm
    Correct Length of line = 250+1.25 = 251.25 m

    Or,
    $TL=ML\frac{\text{Correct Length of Chain}}{\text{Original length of Chain}}$

    $TL=250\frac{\text{20.1}}{\text{20}}$

    TL = 251.25 m

  3. Select the incorrect statement.


    1. Correction for temperature is either positive or correction.
    2. Correction for the pull is either positive or negative
    3. Correction for sag is either positive or negative
    4. none of the above

    View Answer
    Answer: c
    Correction for sag is always negative.

  4. Correction for sag is calculated from ...


    1. ${C}_{s}=\frac{L \times (w\times L)^2}{24\times P^2}$

      2.
    2. ${C}_{s}=\frac{L^2 \times W^2}{24\times P^2}$

    3. Both (a) and (b)
    4. none of the above

      5. Where $w=$ Weight of the tape per unit length
      $W=$ Total weight of the tape
      $L=$ Length of the tape
      $P=$ Pull applied

    View Answer
    Answer: a
    ${C}_{s}=\frac{L \times (w\times L)^2}{24\times P^2}$

    Or,
    ${C}_{s}=\frac{L \times W^2}{24\times P^2}$

  5. The pull that equalises the correction due to pull and correction due to sag is called ____.


    1. Equalising Pull
    2. Normal Tension
    3. Normalizing Pull
    4. Normal Force

    View Answer
    Answer: b

  6. Correction for slope is given by ...


    1. ${C}_{s}=L(1-\cos\theta)$
    2. ${C}_{s}=2L \times \sin^2 \frac{\theta}{2}$
    3. Both (a) and (b)
    4. None of the above

    View Answer
    Answer: c

  7. Select the correct statement


    1. Correction for slope is always negative
    2. Correction for slope is always positive
    3. Correction for slope is either positive or negative
    4. None of the above

    View Answer
    Answer: a
    The distance measured along the slope is always greater than the horizontal distance and hence the correction is always NEGATIVE.

  8. Correction for bad ranging is given by ...


    1. ${C}_{h}=\frac{d^3}{3L}$
    2. ${C}_{h}=\frac{d^2}{4L}$
    3. ${C}_{h}=\frac{d^3}{2L}$
    4. ${C}_{h}=\frac{d^2}{2L}$

    View Answer
    Answer: d

  9. What will be the total error after calculating various errors?


    1. It will be the summation of magnitudes all the errors
    2. It will be the average of all the errors
    3. It will be the algebraic sum of all the errors
    4. All are correct

    View Answer
    Answer: c

  10. Select the correct statement.


    1. Check Lines are run in the field to check the accuracy of the work
    2. Tie Lines are run to take details of the nearby objects
    3. Tie Line can also be used as a Check Line
    4. All are correct

    View Answer
    Answer: d

  11. What is the least angle of a well-conditioned triangle?


    1. $20^\circ$
    2. $30^\circ$
    3. $25^\circ$
    4. $40^\circ$

    View Answer
    Answer: b

  12. Which of the following statement is true regarding offsets?


    1. They are Perpendicular to the chain line
    2. They are not perpendicular to the chain line
    3. They are always perpendicular to the chain line
    4. They are either perpendicular or oblique to the chain line.

    View Answer
    Answer: d

  13. An offset is laid $3^\circ$ from its true direction on the field. If the scale of plotting is 20 m to 1 cm, find the maximum length of the offset so that the displacement of the point on the paper may not exceed 0.25 mm.
    $\sin 3^\circ = 0.0523$; $\cos 3^\circ = 0.9986$


    1. 9.5 m
    2. 0.5 m
    3. 41.86 m
    4. 3.9 m

    View Answer
    Answer: a
    Displacemet of the point on the paper$=\frac{l\times \sin 3^\circ}{20}=0.025 \text{ cm}$
    $l=9.5 m$





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