Deck 16: Surveying Terminology: Contour Intervals, Tacheometry, Magnetic Variation

Question 1

The contour interval depends upon the

A)nature of the ground
B)scale of map
C)purpose and extent of survey
D)all of these

Answer 1

all of these

Question 2

The difference is length between the arc and the subtended chord on the surface of the earth for a distance of 18.2 km is only

A)10 mm
B)30°mm
C)50°mm
D)100 mm

Answer 2

10 mm

Question 3

The image formed by the objective in the plane of cross hairs is

A)real and straight
B)real and inverted
C)virtual and straight
D)virtual and inverted

Answer 3

real and inverted

Question 4

The vertical distance between any two consecutive contours is called

A)vertical equivalent
B)horizontal equivalent
C)contour interval
D)contour gradient

Question 5

The principle of tacheometry is used

A)for locating contours
B)on hydrographic surveys
C)for filling in detail in topographic surveys
D)all of these

Question 6

The correction to be applied to each 30°m chain for a line measured along a slope of ? is

A)30°(1 - sin ?)
B)30°(1 - cos ?)
C)30°(1 - tan ?)
D)30°(1 - cot ?)

Question 7

The accuracy in laying down the perpendicular offsets and in measuring them depends upon

A)scale of plotting
B)length of offset
C)importance of the object
D)all of these

Question 8

The diurnal variation of the magnetic needle is

A)more
B)less

Question 9

The horizontal angle between the true meridian and a survey line is called

A)magnetic bearing
B)azimuth
C)dip
D)magnetic declination

Question 10

When the angular and linear measurements are equally precise in traversing, the balancing of a traverse is done by

A)transit rule
B)empirical rule
C)Bowditch's rule
D)any one of these

Question 11

When the measured length is less than the actual length, the error is known as

A)positive error
B)negative error
C)compensating error
D)instrumental error

Question 12

A branch of surveying in which the horizontal and vertical distances of points are obtained by instrumental observations, is known as

A)chain surveying
B)plane table surveying
C)tacheometric surveying
D)hydrographic surveying

Question 13

In a well conditioned triangle, no angle should be less than

A)30°
B)40°
C)50°
D)60°

Question 14

In levelling, the correction for curvature (in metres) is equal, where D = Distance from the level to the staff reading in kilometres.

A)0.00785 D2
B)0.0785 D2
C)0.0112 D2
D)0.0673 D2

Question 15

In order to fix up the directions of the survey lines in the compass survey, the horizontal angle between the survey line and a fixed line of reference is measured. This fixed line reference is the magnetic meridian.

Question 16

The distance by which the last point of the traverse falls short to coincide with the starting point is called the closing error.

A)Right
B)Wrong

Question 17

In levelling, the effect of refraction varies with the atmospheric conditions

Question 18

If a chain is used at a temperature at which it was calibrated, the error in measured length is positive.

A)equal to
B)lower than
C)higher than

Question 19

In plane table surveying, field work is recorded in a field book to be plotted afterwards.

A)Agree
B)Disagree

Question 20

The points on a contour gradient will have the same elevation.

Question 21

The line joining the points having the same elevation above the datum surface, is called a

A)contour surface
B)contour line
C)contour interval
D)dontour gradient

Question 22

The working from whole to the part is done in surveying in order to ensure that

A)survey work is completed more quickly
B)number of errors is minimum
C)plotting is done more quickly
D)errors and mistakes of one portion do not affect the remaining portion

Question 23

The building is an example of obstacle in which chaining and vision are both obstructed.

A)Correct
B)Incorrect

Question 24

An angle measured clockwise from the proceeding survey line to the following survey line is called

A)direct angle
B)vertical angle
C)horizontal angle
D)deflection angle

Question 25

The capacity of telescope of producing a sharp image is called its

A)definition
B)brightness
C)sensitivity
D)magnification