MCQ
26181. The obstacle, which obstructs chaining but not vision, is a-
river
pond
hill
all of these
26182. When the magnetic bearing of the sun at noon is 185°20′, the magnetic declination will be-
5°20′ east
5°20′ west
5°20′ north
5°20′ south
26183. The lines of earth's magnetic field run from-
south to north
north to south
east to west
west to east
26184. The obstacle, which obstructs vision but not chaining, is a-
river
pond
hill
all of these
26185. In a whole circle bearing system N25°15′W corresponds to-
115°15′
154°45′
205°15′
334°45′
26186. A line joining the apex of a triangle to some fixed points on the opposite side is called a-
30°
40°
50°
60°
26187. A line joining the optical centre of the object glass & the centre of the eyepiece, is known as-
fundamental line
axis of telescope
axis of level tube
line of collimation
ব্যাখ্যা:
26188. The horizontal angle between the true meridian and magnetic meridian is known as-
true bearing
dip
local attraction
magnetic declination
26189. If the fore bearing of a line is 36°15′, its back bearing will be-
36°15′
126°15′
143°45′
216°15′
ব্যাখ্যা: সম্মুখ বিয়ারিং ও পশ্চাৎ বিয়ারিং-এর মাঝে পার্থক্য ১৮০০ হয়।
26190. Cumulative errors that occur in chaining are proportional to-
L
√L
1/L
1/√L
26191. The angle between the reflecting surfaces of a prism square is-
30°
45°
60°
75°
26192. Compensating errors that occur in chaining are proportional to-
L
√L
1/L
1/√L
26193. The angle of intersection of the horizon glass and index glass in an optical square is-
30°
45°
60°
75°
26194. An open cross-staff is commonly used for setting out-
short offsets
long offsets
oblique offsets
none of these
26195. A French cross-staff has a magnetic compass at the top.
Right
Wrong
26196. 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
ব্যাখ্যা:
26197. In a prismatic compass, the zero of the graduated ring is located at-
north end
east end
south end
west end
26198. If the fore bearing of a line is its back bearing will be
36°15′.
126°15′
143°45′
216°15′
26199. At the equator, the amount of dip is-
0°
45°
60°
90°
26200. The axis of telescope level must be - to the line of collimation.
parallel
perpendicular