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WorksheetsDay 63-Nov 26-worksheet-Diploma-Compass surveying 2
Total questions: 15
Worksheet time: 11mins
Surveyor’s compass works on —
Whole circle bearing
Quadrantal bearing
Arbitrary azimuth
Magnetic azimuth only
In prismatic compass, the readings appear inverted because —
Needle is upside down
Index glass is reversed
Graduations are engraved inverted
North–South is reversed
Local attraction is indicated when the difference between FB and BB is not equal to —
0°
90°
180°
360°
Magnetic declination is the angle between —
True meridian and survey line
Magnetic meridian and survey line
True meridian and magnetic meridian
Arbitrary meridian and magnetic meridian
Annual variation of magnetic declination occurs due to —
Earth’s rotation
Moon’s revolution
Earth’s revolution around the Sun
Solar winds
Maximum value of measurement in quadrantal bearing system is —
90°
180°
360°
45°
Dip of the magnetic needle is zero at the equator.
True
False
Broad-form needle is used in ________ compass.
Prismatic
Surveyor’s
Marine
Gyro
Edge-bar needle is used in (a) compass.
Back bearing = Fore bearing ± (a) .
Vertical angle made by magnetic needle with horizontal is called (a) .
Lines having equal declination at same time are (a) .
Lines having zero declination at same time are (a) .
Fore bearing of CD = 230°15'. Find the back bearing.
(a)
Magnetic bearing = 197°. Declination = 3° W. Find true bearing.
(a)
