MCQ
221. The angle between the reflecting surfaces of a prism square is-
30°
45°
60°
75°
222. A line joining the apex of a triangle to some fixed points on the opposite side is called a-
30°
40°
50°
60°
223. In a prismatic compass, the zero of the graduated ring is located at-
north end
east end
south end
west end
224. The area of any irregular figure can be calculated accurately with the help of a planimeter.
True
False
225. The curvature of the earth is taken into consideration if the limit of survey is-
50 to 100km²
100 to 200km²
200 to 250km²
more than 250km²
226. The correction to be applied to each 30m chain for a line measured along a slope of 0 is-
30 (1- sine)
30 (1-cose)
30 (1-tane)
30 (1-cote)
227. A scale which has a common representative fraction, but read in different measures, is called- a
a plain scale
a diagonal scale
a shrunk scale
a comparative scale
228. When the length of a chain along a slope of 0 is L, the correction for slope required is-
I sin²θ/2
I cos²θ/2
2I sin²θ/2
2I cos²θ/2
229. An average length of a pace is-
60cm
80cm
100cm
120cm
230. A French cross-staff has a magnetic compass at the top.
Right
Wrong
231. Cumulative errors that occur in chaining are proportional to-
L
√L
1/L
1/√L
232. The horizontal angle between the true meridian and a survey line is called-[BREB-15]
magnetic bearing
azimuth
dip
magnetic declination
233. In a direct vernier, the smallest division of a vernier is - the smallest division of its primary scale.
equal to
shorter than
longer than
d none of these
234. The tension, at which the effects of pull and sag for a tape are neutralized, is known as-
initial tension
absolute tension
surface tension
normal tension
235. The obstacle, which obstructs chaining but not vision, is a-
river
pond
hill
all of these
236. The angle of intersection of the horizon glass and index glass in an optical square is-
30°
45°
60°
75°
237. A diagonal scale is used to read dimensions.
two
three
four
five
238. An open cross-staff is commonly used for setting out-
short offsets
long offsets
oblique offsets
none of these
239. The obstacle, which obstructs vision but not chaining, is a-
river
pond
hill
all of these
240. Compensating errors that occur in chaining are proportional to-
L
√L
1/L
1/√L