# Practice Test: Question Set - 16

**1. The back staff reading on a B.M. of R.L. 500.000 m is 2.685 m. If foresight reading on a point is 1.345 m, the reduced level of the point, is**

- (A) 502.685 m

- (B) 501.345 m

- (C) 501.340 m

- (D) 504.030
m

**2. Let angular value of one graduation of a tube of length ‘**

*x’*be ‘*φ*’ seconds and ‘*R’*be the radius of its internal curved surface, then- (A)

*φ*=

*x*/206265

*R*

- (B)

*φ*=

*R*/206265

*x*

- (C)

*φ*= 206265/

*x. R*

- (D)

*φ*=

*x. R*/206265

**3. If ‘**

*L’*is in kilometres, the curvature correction is- (A) 58.2

*L*

^{2}mm

- (B) 64.8

*L*

^{2}mm

- (C) 74.8

*L*

^{2}mm

- (D) 78.4

*L*

^{2}mm

**4. Pick up the correct statement from the following:**

- (A) To locate a
gross error in bearing that may exist in controlled theodolite traverse, we may
plot the traverse from each end. The traverse station having the same
coordinates by each route is the one where the error lies

- (B) To locate a
gross error in bearing, in a controlled traverse, we plot the traverse and the
station through which perpendicular to sector of the closing line passes is the
station at which the error was made

- (C) To locate a
gross error due to taping in a controlled traverse, we plot the traverse to a
convenient scale. The bearing of the closing error will be approximately the
same as that of the leg in which the gross error consists

- (D) All the
above

**5. Permanent adjustments of a level are**

- (A) 2 in number

- (B) 3 in number

- (C) 4 in number

- (D) 6 in number

**6. Orientation of a plane table by solving two point problems is only adopted when**

- (A) Saving of
time is a main factor

- (B) Better
accuracy is a main factor

- (C) Given
points are inaccessible

- (D) None
of these

**7. If ‘**

*V’*is the speed of a locomotive in km per hour, ‘*g’*is the acceleration due to gravity, ‘*G’*is the distance between running faces of the rails and ‘*R’*is the radius of the circular curve, the required super elevation is- (A)

*gV*/

^{2}*GR*

- (B)

*Rg*/

*GV*

^{2}- (C)

*GR*/

*gV*

^{2}- (D)

*GV*/

^{2}*gR*

**8. Pick up the correct statement from the following:**

- (A) Spherical
aberration may be reduced by diminishing the aperture

- (B) Spherical
aberration may be minimised by replacing the single lens by a combination of
the lenses

- (C) In
telescope objectives, a combination of convex lens and concave lens is used

- (D) All
the above

**9. The method generally preferred to for contouring an undulating area, is**

- (A) Chain
surveying

- (B) Plane
table surveying

- (C) Tacheometrical
surveying

- (D) Compass
surveying

**10. Measuring with a 30 m chain, 0.01 m too short, introduces**

- (A) Positive
compensating error

- (B) Negative
compensating error

- (C) Positive
cumulative error

- (D) Negative cumulative
error

**11. The ratio of the radius and apex distance of a curve deflecting through Δ°, is**

- (A) sec (Δ/2) -
1

- (B) 1 - sec
(Δ/2)

- (C) cos (Δ/2) -
1

- (D) tan (Δ/2) -
1

**12. In setting up a plane table at any station**

- (A) Levelling is
done first

- (B) Centering is
done first

- (C) Both
levelling and centering are done simultaneously

- (D) Orientation
is done first

**13. Staff readings on pegs**

*x*and*y*from*X*station are 1.755 m and 2.850 m, and from station*Y*on staff head at*Y*and*X*are 0.655 m and 1.560 m. If reduced level of*X*is 105.5 m, the reduced level of*Y*is- (A) 104.0 m

- (B) 104.5 m

- (C) 105.0 m

- (D) 105.5 m

**14. Metric chains are generally available in**

- (A) 10 m and 20
m length

- (B) 15 m and 20
m length

- (C) 20 m and 30
m length

- (D) 25 m and 100
m length

**15. The bearing of**

*AB*is 190° and that of*CB*is 260° 30'. The included angle*ABC*, is- (A) 80° 30'

- (B) 99° 30'

- (C) 70° 30'

- (D) None of
these

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