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Q1. | The angle between two plane mirrors of optical square, is. |

A. | 20Â° [Wrong Answer] |

B. | 30Â° [Wrong Answer] |

C. | 45Â° [Correct Answer] |

D. | 60Â° [Wrong Answer] |

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Explanation:-
Answer : CDiscuss it below :!! OOPS Login [Click here] is required to post your answer/resultHelp other students, write article, leave your comments |

**Also Read Similar Questions Below :**

⇒ If the length of a transition curve to be introduced between a straight and a circular curve of radius 500 m is 90 m, the maximum perpendicular offset for the transition curve, is.

0.70 m

1.70 m

2.70 m

3.70 m

⇒ If θ is the slope of the ground and

*l*is the measured distance, the correction is.

2l sin2 Î¸/2

2l cos2 Î¸/2

2l tan2 Î¸/2

2l cot2 Î¸/2.

⇒ The 'fix' of a plane table station with three known points, is bad if the plane table station lies.

in the great triangle

outside the great triangle

on the circumference of the circumscribing circle

none of these.

⇒ An error under the same conditions always of the same size and sign is called as

Uniform error

Systematic error

Cumulative error

Any of (B) and (C) above

⇒ The theodolites used for making tacheometric observations by optical wedge system, are.

provided with stadia hairs in front of eye piece

not provided with stadia hairs at all

fitted with a glass wedge inside the telescope

fitted with a glass wedge in front of telescope.

⇒ 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

⇒ The tie line is run through the survey to

Take off sets for detailed surveying

Take details of nearby objects

Check accuracy of work

None of the above

⇒

*ABCD*is a rectangular plot of land. If the bearing of the side

*AB*is 75°, the bearing of

*DC*is.

75Â°

255Â°

105Â°

285Â°

⇒ Pick up the correct statement from the following :

The horizontal angle between magnetic meridian and true meridian at a place is called magnetic declination or variance of the compass

the imaginary lines which pass through points at which the magnetic declinations are equal at a given time are called isogonic lines

the isogonic lines through places at which the declination is zero are termed agonic lines

all the above.

⇒ A correction for error due to refraction is

0-01 d

^{2}m

0-001 d

^{2}m

0.01122 d

^{2}m

0.078 d

^{2}m

⇒ Closed contours of decreasing values towards their centre, represent.

a hill

a depression

a saddle or pass

a river bed.

⇒ The magnetic meridian at any point, is the direction indicated by a freely suspended

magnetic needle

and properly balanced magnetic needle

properly balanced and uninfluenced by local attractive force

magnetic needle over an iron pivot.

⇒ Designation of a curve is made by :

angle subtended by a chord of any length

angle subtended by an arc of specified length

radius of the curve

curvature of the curve.

⇒ A scale which has a common representative fraction, but read in different measures is called a

Plain scale

Diagonal scale

Shrunk scale

Comparative scale

⇒ An internal focussing type surveying telescope, may be focussed by the movement of.

objective glass of the telescope

convex-lens in the telescope

concave lens in the telescope

plano-convex lens in the telescope.

⇒ Volume of the earth work may be calculated by.

mean areas

end areas

Prismoidal formula

all the above.

⇒ A relatively fixed point of known elevation above datum, is called.

bench mark

datum point

reduced level

reference point.

⇒ During secular variation of magnetic meridian at different places.

range of oscillations is constant

period of oscillation is constant

range and period of oscillation both vary

period of oscillation only varies.

⇒ 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

⇒ The ratio of the angles subtended at the eye, by the virtual image and the object, is known as telescope's.

resolving power

brightness

field of view

magnification.

⇒ Contour interval is

the vertical distance between two con-secutive contours

the horizontal distance between two consecutive contours

the vertical distance between two points on same contour

the horizontal distance between two points on same contour

⇒ An obstacle which obstructs chaining but not ranging may be a

Building

Lake

Hillock

Electric pole

⇒ The magnetic bearing of a line is 32° and the magnetic declination is 10° 15' W. The true bearing is.

21Â° 45'

42Â° 15'

42Â° 15' W

21Â° 45' W

⇒ If deflection angles are measured in a closed traverse, the difference between the sum of the right-hand and that of the left hand angles should be equal to.

0Â°

90Â°

180Â°

360Â°

⇒ The diaphragm of a stadia theodolite is fitted with two additional.

horizontal hairs

vertical hairs

horizontal and two vertical hairs

none of these.

⇒ The slope correction for a length of 30 m along a gradient of 1 in 20, is

3.75 cm

0.375 cm

37.5 cm

2.75 cm.

⇒ An ideal transition curve is.

cubic parabola

cubic spiral

clothoid spiral

true spiral.

⇒ The daily variation in magnetic declination is known as

Diurnal variation

Solar variation

Secular variation

Irregular variation

⇒ When a chain is used at a temperature more than the temperature it was calibrated the error in measured length will be

Cumulative

Compensating

Negative

Observational error

⇒ Which of the following methods of offsets involves less measurement on the ground?

method of perpendicular offsets

method of oblique offsets

method of ties

all involve equal measurement on the ground