# Practice Test: Question Set - 24

**1. Two concave lenses of 60 cm focal length are cemented on either side of a convex lens of 15 cm focal length. The focal length of the combination is**

- (A) 10 cm

- (B) 20 cm

- (C) 30 cm

- (D) 40 cm

**2. Cross-staff is used for**

- (A) Setting
out right angles

- (B) Measuring
contour gradient

- (C) Taking
levels

- (D) Measuring
distances

**3. The staff intercept will be**

- (A) Greater
farther off the staff is held

- (B) Smaller,
farther off the staff is held

- (C) Smaller,
nearer the staff is held

- (D) Same,
wherever the staff is held

**4. A bearing of a line is also known as**

- (A) Magnetic
bearing

- (B) True
bearing

- (C) Azimuth

- (D) Reduced
bearing

**5.**

*ABCD*is a rectangular plot of land. If the bearing of the side*AB*is 75°, the bearing of*DC*is- (A) 75°

- (B) 255°

- (C) 105°

- (D) 285°

**6. For indirect ranging, number of ranging rods required, is**

- (A) 1

- (B) 2

- (C) 3

- (D) 4

**7. An ideal transition curve is**

- (A) Cubic
parabola

- (B) Cubic
spiral

- (C) Clothoid
spiral

- (D) True
spiral

**8. Ranging in chain survey means**

- (A) Looking
at an isolated point not on the line

- (B) Establishing
an intermediate point on the line

- (C) Determining
the distance between end points

- (D) Determining
the offset distance

**9. A well conditioned triangle has no angle less than**

- (A) 20°

- (B) 30°

- (C) 45°

- (D) 60°

**10. Geodetic surveying is undertaken**

- (A) For
production of accurate maps of wide areas

- (B) For
developing the science of geodesy

- (C) Making
use of most accurate instruments and methods of observation

- (D) All the
above

**11. For preparation of a contour plan for a route survey**

- (A) Method
of squares is used

- (B) Method
of trace contour is used

- (C) Method
of cross profile is used

- (D) Indirect
method of contouring is used

**12. A sewer is laid from a manhole ‘**

*A’*to a manhole ‘*B’*, 250 m away along a gradient of 1 in 125. If the reduced level of the invert at ‘*A’*is 205.75 m and the height of the boning rod is 3 m, the reduced level of the sight rail at ‘*B’*, is- (A) 208.75 m

- (B) 202.75 m

- (C) 206.75 m

- (D) 211.75 m

**13. A back sight**

- (A) Is always
taken on a point of known elevation or can be computed

- (B) Is
added to the known level to obtain the instrument height

- (C) Taken on an
inverted staff is treated as negative

- (D) All the above

**14. Removal of parallax, may be achieved by focusing**

- (A) The
objective

- (B) The
eye-piece

- (C) The
objective and the eye-piece

- (D) None
of these

**15. The angle of intersection of a contour and a ridge line, is**

- (A) 30°

- (B) 45°

- (C) 60°

- (D) 90°

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