# Practice Test: Question Set - 22

**1. The true meridian of a place is the line in which earth's surface is intersected by a plane through**

- (A) East
and west points

- (B) Zenith
and nadir points

- (C) North
and south geographical poles

- (D) North
and south magnetic poles

**2. The area of any irregular figure of the plotted map is measured with**

- (A) Pentagraph

- (B) Sextant

- (C) Clinometer

- (D) Planimeter

**3. If ‘**

*F’*is the pull applied at the ends of tape in kg, ‘*l’*is the length of tape between end marks in metres, ‘*w’*is the weight of the tape in kg per metre run, then sag correction- (A)

*C*=

*w*

^{2}

*l*

^{3}/24

*F*

^{2}

- (B)

*C*=

*w*

^{3}

*l*

^{2}/24

*F*

^{2}

- (C)

*C*=

*w*

^{2}

*l*

^{3}/24

*F*

^{3}

- (D)

*C*= 24

*w*

^{2}

*l*

^{3}/80

*F*

^{3}

**4. If ‘θ’ is the vertical angle of an inclined sight, ‘δ’ is the angle of tilt of the staff, the error**

- (A)

*E*= 1 - [cos (θ ± δ)/cosθ]

- (B)

*E*= 1 - [sin (θ ± δ)/sinθ]

- (C)

*E*= 1 - [tan (θ ± δ)/tanθ]

- (D) None of
these

**5. The construction of optical square is based, on the principle of optical**

- (A) Reflection

- (B) Refraction

- (C) Double
refraction

- (D) Double
reflection

**6. If Δ is the angle of deflection of a simple curve of radius**

*R*, the length of the curve is :- (A)

*πR*Δ/90°

- (B)

*πR*Δ/180°

- (C)

*πR*Δ/270°

- (D)

*πR*Δ/360°

**7. Correction per chain length of 100 links along a slope of α° is**

- (A) 1.5

*α*

^{2}/100

- (B) 1.5

*α*/100

- (C) 1.5

*α*

^{3}/100

- (D) 1.5

*α*

^{3}

**8. The difference of level between a point below the plane of sight and one above, is the sum of two staff readings and an error would be produced equal to**

- (A) The distance
between the zero of gradient and the foot of the staff

- (B) Twice
the distance between the zero of graduation and the foot of the staff

- (C) Thrice the
distance between the zero of graduation and the foot of the staff

- (D) None of the
above

**9. If α is the angle between the polar ray and the tangent at the point of commencement of a lemniscate curve, the equation of the curve, is**

- (A)

*l*=

*k √*sin α

- (B)

*l*=

*k √*sin 2α

- (C)

*l*=

*k √*sin 3α

- (D)

*l*=

*k √*tan 2α

**10. In tangential tacheometry, an ordinary level staff is used**

- (A) Leaning
towards the instrument for inclined sights upward

- (B) Leaning
away from the instrument for inclined sights downwards

- (C) Vertical in
all cases

- (D) None of
these

**11. Stadia techeometry was discovered by James Watt in the year.**

- (A) 1670

- (B) 1770

- (C) 1870

- (D) 1900

**12. Keeping the instrument height as 1.5 m, length of staff 4 m, the slope of the ground as 1 in 10, the sight on the down-slope, must be less than**

- (A) 30 m

- (B) 25 m

- (C) 20 m

- (D) 15 m

**13. The distance between the point of intersection of an upgrade +**

*g*_{1}% and downgrade*g*_{2}% and the highest point of the vertical curve of length*L*, is- (A)

*L (g*-

_{1}*g*/400

_{2})- (B)

*L (g*+

_{1}*g*/400

_{2})- (C)

*L (g*+

_{1}*g*/800

_{2})- (D)

*L (g*-

_{1}*g*/800

_{2})**14. Surveys which are carried out to provide a national grid of control for preparation of accurate maps of large areas are known**

- (A) Plane
surveys

- (B) Geodetic
surveys

- (C) Geographical
surveys

- (D) Topographical
surveys

**15. If +0.8% grade meets -0.7% grade and the rate of change of grade for 30 m distance is 0.05, the length of the vertical curve will be**

- (A) 600 m

- (B) 700 m

- (C) 800 m

- (D) 900 m

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