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1. The following sights are taken on a "turning point"
foresight only	backsight only
foresight and backsight	foresight and intermediate sight

2. The rise and fall method of levelling provides a complete check on
backsight	intermediate sight
foresight	all of the above

3. If the R.L. of a B.M. is 100.00 m, the back- sight is 1.215 m and the foresight is 1.870 m, the R.L. of the forward station is ____.
99.345 m	100.345 m
100.655m	101.870m

4. In an internal focussing type of telescope, the lens provided is _____.
concave	convex
plano-convex	plano-concave

5. Which of the following errors can be neutralised by setting the level midway between the two stations ?
error due to curvature only	error due to refraction only
error due to both curvature and re-fraction	none of the above

6. Height of instrument method of levelling is _____.
more accurate than rise and fall method	less accurate than rise and fall method
quicker and less tedious for large number of intermediate sights	none of the above

7. The rise and fall method _____.
is less.accurate than height of instrument method	is not suitable for levelling with tilting levels
provides a check on the reduction of intermediate point levels	quicker and less tedious for large number of intermediate sights

8. If the staff is not held vertical at a level¬ling station, the reduced level calculated from the observation would be _____.
true R.L.	more than true R.L.
less than true R.L.	none of the above

9. The difference between a level line and a horizontal line is that _____.
level line is a curved line while hori-zontal line is a straight line	level line is normal to plumb line while horizontal line may not be normal to plumb line at the tangent point to level line
horizontal line is normal to plumb line while level line may not be normal to the plumb line	both are same

10. The sensitivity of a bubble tube can be increased by _____.
increasing the diameter of the tube	decreasing the length of bubble
increasing the viscosity of liquid	decreasing the radius of curvature of tube

11. _____With the rise of temperature, the sensiti¬vity of a bubble tube
decreases	increases
remains unaffected	none of the above

12. Refraction correction
completely eliminates curvature correction	partially eliminates curvature correction
adds to the curvature correction	has no effect on curvature correction

13. The R.L, of the point A which is on the floor is 100 m and backsight reading on A is 2.455 m. If the foresight reading on the point B which is on the ceiling is 2.745 m, the R.L. of point B will be
94.80 m	99.71 m
100.29 m	105.20 m

14. As applied to staff readings, the correc¬tions for curvature and refraction are respectively The above table shows a part of a level field book. The value of X should be
98.70	100.00
102.30	103.30

15. If the horizontal distance between the staff point and the point of observation is d, then the error due to curvature of earth is proportional to
d	1/d
d2	1/d2

16. Sensitiveness of a level tube is designated by _____.
radius of level tube	length of level tube
length of bubble of level tube	none of the above

17. Which of the following statements is in-correct ?
Error due to refraction may not be completely eliminated by reciprocal levelling.	Tilting levels are commonly used for precision work.
The last reading of levelling is always a foresight.	All of the above statements are incorrect.

18. Dumpy level is most suitable when _____.
the instrument is to be shifted frequently	fly levelling is being done over long distance
many readings are to be taken from a single setting of the instrument	all of the above

19. The difference of levels between two stations A and B is to be determined. For best results, the instrument station should be ____.
equidistant from A and B	closer to the higher station
closer to the lower station	as far as possible from the line AB

20. Contour interval is _____.
inversely proportional to the scale of the map	directly proportional to the flatness of ground
larger for accurate works	larger if the time available is more