Surveying Sheet 19
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1) Question.
A map mentions the scale 1cm=1km, the scale is in ratio -
Answer.1 KM = 100000 cm
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2) Question.
The permissible error in chaining for measurement with chain or rough or hilly ground is -
Answer. -
3) Question.
The kind of survey work in which curvature of earth is ignored is called -
Answer. -
4) Question.
A line of 5m on the original map is shrunk to 4.6 cm. Calculate the shrunk scale if the original scale of the map was 1cm=80m
Answer. -
5) Question.
10 divisions of vernier scale are equal to 11 divisions of a main scale of each 0.1 mm. What is the least count of the vernier scale?
Answer. -
6) Question.
Which one of the following surveys is required in observations of stars?
Answer. -
7) Question.
The smallest scale adopted for topographical survey is -
Answer.The scale of a map is expressed as 1 : n, which means 1 unit on the map represents n units on the ground.
Given options:
Scale Ground distance represented by 1 cm on map 1 : 25,000 250 m 1 : 50,000 500 m 1 : 250,000 2.5 km 1 : 500,000 5 km As the denominator increases, a larger ground area is represented by the same map distance. Therefore, the map shows less detail, and the scale is considered smaller.
Rule
- Large-scale maps → Small area, more detail (e.g., 1:25,000)
- Small-scale maps → Large area, less detail (e.g., 1:500,000)
Among the given options, 1 : 500,000 has the largest denominator and therefore represents the largest area with the least detail.
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8) Question.
The basic principle of working from whole to part -
Answer. -
9) Question.
If S is the smallest division on the main scale and n are the number of divisions on the vernier, then the least count of the vernier is -
Answer. -
10) Question.
The vernier that is calibrated in the direction opposite to the main scale is called -
Answer.A retrograde vernier has its graduations marked in the opposite direction of the main scale, meaning the vernier scale divisions increase as the main scale divisions decrease.
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Direct vernier:This is the most common type of vernier, where the graduations on the vernier scale are aligned in the same direction as the main scale.
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Double vernier:This type of vernier uses two separate vernier scales to read with greater precision.
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Extended vernier:This vernier has more divisions than a standard vernier, allowing for finer measurements.