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191.

In levelling, the correction for combined curvature and refraction (in metres) is equal to

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

192.

The error which is not completely eliminated in reciprocal levelling, is

A.	error due to curvature	B.	error due to refraction
C.	error due to non-adjustment of the line of collimation	D.	error due to non-adjustment of bubble tube

193.

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

194.

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

195.

The vertical distance between any two consecutive contours is called

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

196.

The horizontal distance between any two consecutive contours is called

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

197.

The contour interval of any survey is inversely proportional to the scale of the map.

Agree

Disagree

198.

The contour interval

should be constant

need not be constant

199.

The contour lines can cross one another on map only in the case of

A.	a vertical cliff	B.	a valley
C.	a ridge	D.	an overhanging cliff

200.

When several contours coincide, it indicates

A.	a vertical cliff	B.	a valley
C.	a ridge