Civil Engineering MCQs

Page No. 272

The prismatic compass and surveyor’s compass________________?


agive whole circle bearing (WCB. of a line and quadrantal bearing (QB. of a line respectively

✓


bboth give QB of a line and WCB of a line

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cboth give QB of a line

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dboth give WCB of a line

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Local attraction in compass surveying may exist due to________________?


a incorrect levelling of the magnetic needle

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b loss of magnetism of the needle

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cfriction of the needle at the pivot

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dpresence of magnetic substances near the instrument

✓



The horizontal angle between the true meridian and magnetic meridian at a place is called______________?


aazimuth

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bdeclination

✓


clocal attraction

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dmagnetic bearing

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View Answer declination

In the quadrantal bearing system, a whole circle bearing of 293° 30′ can be expressed as______________?


aW23°30’N

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bN66°30’W

✓


cS113°30’N

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dN23°30’W

✖


View Answer N66°30’W

In the prismatic compass______________?


a the magnetic needle moves with the box

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b the line of the sight does not move with the box

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c the magnetic needle and graduated circle do not move with the box

✓


d the graduated circle is fixed to the box and the magnetic needle always remains in the N-S direction

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For accurate work, the steel band should always be used in preference to chain because the steel band______________?


ais lighter than chain

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b is easier to handle

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cis practically inextensible and is not liable to kinks when in use

✓


dcan be easily repaired in the field

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The maximum tolerance in a 20 m chain is_______________?


a±2 mm

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b ±3 mm

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c±5 mm

✓


d ±8 mm

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View Answer ±5 mm

The length of a chain is measured from_______________?


acentre of one handle to centre of other handle

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b outside of one handle to outside of other handle

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coutside of one handle to inside of other handle

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d inside of one handle to inside of other handle

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If the true bearing of a line AB is 269° 30′, then the azimuth of the line AB is_____________?


a0° 30′

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b 89° 30′

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c90° 30′

✓


d269° 30′

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View Answer 90° 30′

For a line AB_______________?


athe forebearing of AB and back bearing of AB differ by 180°

✓


b the forebearing of AB and back bearing of BA differ by 180°

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cboth (A. and (B. are correct.

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dnone is correct

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