Advanced Surveying MCQs Practice Set
1. If the equatorial distance between two meridians is 100 km, their distance at 60o latitude will be
1000 km
600 km
800 km
500 km (Ans)
400 km
2. Pick up the incorrect statement from the following. In a spherical triangle
- every angle is less than two right angles
- sum of the three angles is equal to two right angles (Ans)
- sum of the three angleless than six right angles and greater than two right angles
- if the sum of any two sides is ꙥ, the sum of the angles opposite them is also ꙥ
- sum of any two sides is greater than the third.
3. According to Napier’s Rules of circular parts for a right angled triangle, sine of middle part equals the product of
- tangents of two adjacent parts
- sines of two adjacent parts
- cosines of two adjacent parts
- cosines of two opposite parts
- both (a) and (b) above (Ans)
4. In a spherical triangle ABC ,right angled at C, sin b equals
- sin a cos A
- cos a sin A
- tan a cot A (Ans)
- cot A tan a
- none of these
5. In a spherical triangle ABC ,right angled at C, sin b equals to
- sin c sin B (Ans)
- cos a cos B
- tan c tan B (Ans)
- sin c cos B
- cos c sin B
6. If E is the spherical excess and R the radius of the earth, the surface area of the triangle, is
- ꙥR2E/ 90o
- ꙥR2E/ 180o (Ans)
- ꙥR2E/ 270o
- ꙥR2E/ 360o
7.If S is the sum of three angles of a spherical triangle, the spherical excess equals
- S – 90o
- S – 180o (Ans)
- S – 270o
- S – 360o
8. The greate circule whose plane is perpendicular to the axis of rotation of the earth, is called
- equator
- terrestrial equator
- 0o latitude
- all the above (Ans)
9. The meridian of a place is
- a great circle passing through the place and the poles
- a great circle whose plane is perpendicular to the axis of rotation and it also passes through the place
- a semi-circle which passes through the place and is terminated at the poles (Ans)
- an arc of the great circle which passes through the place and is perpendicular to the equator
10. Latitude of a place is the angular distance from
- Greenwich to the place
- equator to the poles
- equator to the nearer pole
- equator to the nearer pole along the meridian of the place
- none of these (Ans)
11. Longitude of a place is the angular distance between the meridian of the place and
- the standard meridian
- the international date line
- that of Greenwich
- both (a) and (c) of above (Ans)
12. Longitude are measured from 0o to
- 180o eastward
- 180o westward
- 180o east or westward (Ans)
- 360o eastward
- 360o westward
13. International dateline is located along
- standard meridian
- Greenwich meridian
- equator
- 180o longitude (Ans)
- none of these
14. Pick up the incorrect statement from the following
- latitudes north of the equator are taken as positive
- latitudes south of the equator are taken as negative
- longitudes east of Greenwich are taken as negative (Ans)
- longitudes west of Greenwich are taken as positive
- both (a) and (d) of the above
15. Places having same latitude
- lie on the parallel of the latitude
- are equidistant from the nearer pole
- are equidistant from both the poles
- are equidistant from the equator
- all the above (Ans)
16. The length of a parallel of λ latitude between two meridians is equal to difference in longitudes multiplied by
sin λ
cos λ (Ans)
tan λ
cot λ
17. Pick up the correct statement from the following
- one degree of longitude has greatest value at the equator (Ans)
- one degree of longitude has greatest value at the poles
- one degree of latitude decreases from the equator to the poles
- one degree of latitude has greatest value at the poles
18. A nautical mile is
- one minute arc of the great circle passing through two points
- one minute arc of the longitude
- 6080 ft
- 1855.109 m
- all the above (Ans)
19. The longitudes of two places at latitude 60o N are 93o
- E and 97o w. Their departure is
- 5100 nautical miles
- 5700 neutical miles (Ans)
- 120 neutical miles
- 500 neutical miles
20. Pick up the correct statement from the following. The difference between the longitudes of the places is obtained
- by subtracting their longitudes if places are in the same hemisphere
- by adding their longitudes if places are in the different hemispheres
- by subtracting the sum of their longitudes exceeding 180o from 360o if places are in different hemispheres (Ans)
- all the above
21. The shortest distance between two places measured along the surface of the earth , is
length of the equator between their longitudes
length of the parallel between their longitudes
length of the arc of the great circle passing through them (Ans)
none of these
22. Pick up the correct statement from the following:
centre of the celestial sphere is taken as the position of the observer
centre of the celestial sphere is taken as the centre of the earth
stars move and maintain their relative positions
celestial bodies through fixed, appear to revolve from east to west round the celestial pole.
All the above (Ans)
23. The zenith is the point on the celestial sphere
east of observer
west of observer
north of observer
south of observer (Ans)
above the observer.
24. The point on the celestial sphere vertically below the observer’s position, is called
zenith
celestial point
nadir (Ans)
pole
25. The plane at right angle to the zenith nador line and passing through the centre of the earth, is called
rational horizon
true horizon
celestial horizon
all the above (Ans)
26. The circle in which a plane tangent to the earth’s surface at the point of observation, intersects the celestial sphere, is called
visible horizon
sensible horizon (Ans)
celestial horizon
true horizon
none of the above
27. Pick up the correct statement from the following :
north end of the polar axis is known as north pole
south end of the polar axis is known as south pole
point where polar axis when produced northward intersects the celestial sphere, is known as north celestial pole
point where polar axis when produced southward intersects the celestial sphere, is known as south celestial pole
all the above (Ans)
28. The great circle along which the sum appears to trace on the celestial sphere with earth as centre during the year, is called
equator
celestial equator
ecliptic (Ans)
none of these
29. The angle between the plane of the equator and the plane of the ecliptic, is known as obliquity of the ecliptic and its value is
22o30′
23o27′ (Ans)
23o30′
24o0′
30. At the first point of Aeries, the sun moves
northward
southward
from south to north of the equator (Ans)
from north to south of the equator
31. The point at which sun’ s declination changes from north to south, is known as
first point of Aeries
first point of Libra
vernal equinox
autumnal equinox
both (b) and (d) of the above (Ans)
32. The position of the sun when its north declination is maximum is known as
venal equinox
autumnal equinox
summer solstice (Ans)
winter solstice
33. The declination and right ascension of the sun are each equal to zero on
March 21 (Ans)
June 21
September 21
December 22
34. The declination and right ascension of the sun becomes 23o27′ N and 90o respectively on
March 21
June 21 (Ans)
September 21
December 22
35. The declination and right ascension of the sun becomes 23o27′ N and 270o respectively on
March 21
June 21
September 21
December 22 (Ans)
36. The sun’s declination remains north between
March 21 to June 21
June 21 to September 21
September 21 to December 21
December 21 to March 21
both (a) and (b) of above (Ans)
37. The great circle which passes through the zenith, nadir and the poles, is known as
meridian (Ans)
vertical circle
prime vertical
none of these
38. The prime vertical passes through
the east point of the horizon
the west point of the horizon
the zenith point of the obsever
the nadir point of horizon
all the above (Ans)
39. The latitude of the observer’s position, is
elevation of the elevated pole
declination of the observer’s zenith
angular distance along the observer’s meridian between equator and the observer
north or south according as the observer is north of equator or south of equator
all the above (Ans)
40. The altitude of a heavenly body is its angular distance, measured on the vertical circle passing through the body, above
equator
horizon (Ans)
pole
none of these
41. The angular distance of a heavenly body from the equator, measured along its meridian, is called
- declination (Ans)
- altitude
- zenith distance
- co-latitude
42. The angle between the observer’s meridian and declination circle of a heavenly body, is known as
hour angle (Ans)
right ascension
declination
azimuth
43. Pick up the incorrect statement from the following. The angular distance of heavenly bodies on observer’s meridian measured from the pole, is
co-declination (Ans)
co-altitude
co-latitude
polar distance
none of these
44. Right ascension of a heavenly body is its equatorial angular distance measured
westward from the first point of Libra
eastward from the first point of Aeries (Ans)
westward from the first point of Aeries
eastward from the first point of Libra
45. Latitude of the observer’s position is equal to altitude of
north pole
pole star
celestial pole (Ans)
all the above
46. The position of a heavenly body on the celestial sphere can be completely specified by
its altitude and azimuth
its declination and hour angle
its declination and right ascension
all the above (Ans)
47. The most convenient co-ordinate system for specifying the relative positions of heavenly bodies on the celestial sphere, is
altitude and azimuth system
declination and hour angle system
declination and right ascension system (Ans)
declination and altitude system
azimuth and declination system
48. Circumpolar stars
rotate round the north pole
rotate round the celestial pole
remain always above the horizon (Ans)
are seldom seen near the pole star
none of these
49. For any star to be a circumpolar star, its
declination must be 0o
declination must be 90o
distance from the poe must be less than the latitude of the observer (Ans)
hour angle must be 180o
50. The altitude of a circumpolar star is maximum when it is
at east elongation
at upper culmination (Ans)
at west elongation
at lower culmination
51. If θ and δ be the latitude of an observer and declination of a heavenly body respectively, the upper culmination of the body will be south of zenith if its zenith distance, is
δ – θ (Ans)
θ – δ
θ + δ
θ + δ/2
52. A star may culminate at zenith if its declination is
greater than the longitude of the place
less than the latitude of the place
equal to the latitude of the place (Ans)
none of these
53. If a star whose declination is 60o N culminates at zenith, its altitude at the lower culmination, is
10o
20o
30o (Ans)
40o
60o
54. the altitudes of a circumpolar star at culminations are 70o and 10o , both culminations being north of zenith. The latitude of the place,is
80o
70o
60o
50o
40o (Ans)
55. In Q.NO.54, declination of the star, is
80o
70o
60o (Ans)
50o
40o
56. The polaris remains below horizon at
10o N
50o N latitude
equator
5o S latitude (Ans)
57. The sidereal day is the time interval between two successive upper transits of
mean sun
first point of Aries (Ans)
first point of Libra
the polar star
moon
58. Pick up the correct statement from the following:
sidereal time at any instant is equal to the hour angle of the first point of Aries
local sidereal time of any place is equal to the right ascension of its meridian
sidereal time is equal to the right ascension of a star at its upper transit
all the above (Ans)
59. Equation of time which is the difference between apparent solar time and mean solar time at any instant, vanishes during one year
once
twice
thrice
four times (Ans)
five times
60. The true and mean suns occupy the same meridian at the same time on
April 15
June 14
September 1
December 25
all the above (Ans)
61. The difference in longitude of two places expressed in time is equal to the difference in their
sidereal time
apparent solar time
mean solar time
all the above (Ans)
62. Pick up the incorrect statement from the following:
apparent solar time is measured from the lower transit of the true sun
mean solar time is measured from the lower transit of the mean sun
sidereal time is measured from the upper transit of the first point of Aries (Ans)
63. The hour angle of the heavenly body for Greenwich meridian equals the hour angle of the body for any other meridian + longitude:
mean sun
true sun
vernal equinox
star
all the above (Ans)
64. With standard meridian as 82o30′ E the standard time at longitude 90o E is 8 h 30 m. The local mean time at the place will be
7 h 00 m
7 h 30 m
8 h 00 m
8 h 30 m
9 h 00 m (Ans)
65. G.M.T. Corresponding to given mean time, equals
L.M.T. – East longitude in time (Ans)
L.M.T. + East longitude in time
L.M.T. – West longitude in time
none of these
66. In a tropical year, the number of sidereal days, are
365
365.2224
365.2422
366.2422 (Ans)
366.2224
67. In a tropical year, the number of sidereal days, are
one less than mean solar days
one more than mean solar days (Ans)
equal to mean solar days
none of these
68. At eastern elongation, the pole star moves
eastward
westward
northward (Ans)
southward
69. At western elongation, the pole star moves
eastward
westward
northward
southward (Ans)
70. At upper culmination, the pole star moves
eastward
westward (Ans)
northward
southward
71. At lower culmination, the pole star moves
eastward (Ans)
westward
northward
southward
72. If a is the observed altitude, the refraction correction in seconds, is
58” cot a (Ans)
58” tan a
58” sin a
58” cos a
73. Pick up the correct statement from the following:
refraction correction is zero when the celestial body is in the zenith
refraction correction is 33′ when the celestial body is on the horizon
refraction correction of celestial bodies depends upon their altitudes
all the above (Ans)
74. The correction for parallax, is
– 8”.8 cos a
+ .8” sin a
+ 8” .8 cos a (Ans)
– 8” .8 cos a
75. Pick up the correct statement from the following:
correction for refraction is always negative
correction for parallax is always positive
correction for semi-diameter is always negative (Ans)
correction for dip is always negative
none of these
76. Pick up the correct statement from the following:
ursa minor’s remains always north of pole star
polar star remains always north of polaris
polaris remains always north of ursa minor’s
ursa minor’s pole star and polaris are the names of the same star (Ans)
77. The polaris describes a small circle round the pole whose radius is approximately
1o (Ans)
2o
3o
4o
78. If the altitudes of a star at its upper and lower transits are 60o30′ and 19o30′ respectively, the latitude of the place, is
30o
35o
40o (Ans)
45o
79. The latitude of a place was obtained by subtracting the zenith distance of a star from its declination, the observed star was between
horizon and equator
equator and zenith
zenith and pole
pole and horizon (Ans)
80. The latitude of a place was obtained by subtracting the declination of a star from its zenith distance, the observed star was between
horizon and equator (Ans)
equator and zenith
zenith and pole
pole and horizon
81. Polaris is usually observed for the determination of the latitude when it is
at culmination (Ans)
at elongation
neither at cilmination nor at elongation
either at cilmination or at elongation
82. Polaris is usually observed for the determination of the azimuth when it is
at culmination
at elongation (Ans)
neither at cilmination nor at elongation
either at cilmination or at elongation
83. Pick up the incorrect statement from the following. High oblique photographs
may have tilt up to 30o
may include the image of the horizon
may not include the image of the horizon
none of these (Ans)
84. Pick up the incorrect statement from the following
Aerial photographs may be either vertical or oblique
vertical photographs are taken with the axis of camera pointing vertically downward
vertical photographs are used for most accurate maps
on oblique photographs, scale variation is larger as compared to that of vertical photographs
all the above (Ans)
85. The point where a vertical line through the optical centre of the camera lens intersects the ground, is known as
ground principle point
ground plumb point (Ans)
iso-centre
perspective centre
86. The foot of the perpendicular on the picture plane through the optical centre of the camera lens, is known as
isocentre
principle point (Ans)
perspective centre
plumb line
87. The point on the photograph where bisector between the vertical line through optical centre of the camera lens and the plate perpendicular meets, is known as
isocentre (Ans)
principle point
perspective centre
plumb point
88. Homologous point is
ground isocentre
photo principle point
ground principle point
all the above (Ans)
89. If f is the focal length of the camera lens and θ is the angle of tilt, the distance of the plumb point from the principle point will be
f sin θ
f cos θ
f tan θ (Ans)
f sec θ
90. The ratio of distances of the plumb point and isocentre from the principle point of a vertical photograph, is
1
2 (Ans)
3
1/2
1/2
91. From the principle point the horizon point lies on the principal line at a distance of
f sin θ
f cos θ
f tan θ (Ans)
f cot θ
92. The product of the distances of plumb point and horizon point of a vertical photograph from its principal point, is
f2 (Ans)
2f2
3f2
1/2f2
1/3f2
93. the height displacement on a vertical photograph
increases as the horizontal distance increases from the principal point
increases as the ground elevation increases
decreases as the flying height increases
all the above (Ans)
94. On vertical photographs, height displacement is
positive for points above datum
negative for points below datum
zero for points vertically below the air station
all the above (Ans)
95. If the image of a triangulation station of R.L.500 m is 4 cm from the principal point of a vertical photo taken from an altitude of 2000 m, above datum, the height displacement will be
2 mm
4 mm
6 mm
8 mm
10 mm (Ans)
96. The relation between the air base(B), photographic base(b), flying height (H) and the focal length(f) of a vertical photograph, is
B = bH/f (Ans)
B = f/bH
B = b/fH
B = H/bf
97. The normal longitudinal overlap is generally kept
50 %
60 % (Ans)
70 %
75 %
98. The net ground area of a vertical photograph 20cm * 20cm on scale 1 : 10000 having overlaps 60 % and 30 %, is
0.50 sq km
0.56 sq km
0.60 sq km
0.64 sq km (Ans)
99. If 16 flight lines are run perpendicular to an area 30 km wide, their spacings on a photographical map on scale 1:50000, will be
1 cm
2 cm
3 cm
4 cm (Ans)
5 cm
100. The maximum error in radial line assumption, is
(h/H)f tan θ (Ans)
(h/H)f2 tan θ
(h/H)f2 sin θ
(h/H)f cos θ
101. If the general ground level of any area is 10 % of the flying height, the principal points may be used as the centres of radial directions for small scale mapping even in tilted photograph upto
1o
2o
3o (Ans)
4o
102. In a truely vertical photograph
principal point coincides the isocentre
iso-centre coincides the plumb point
plumb point coincides the principal point
principal point, iso-centre and plumb point coincide
all the above (Ans)
103. Pick up the incorrect statement from the following :
in truely vertical photographs without relief angles are true at the plumb point
in tilted photographs without relief, angles are true at the iso-centre
in tilted photographs with relief, angles are true at the principal point (Ans)
none of these
104. The distance between the minor control point and the principal point should be equal to
base line of the left photograph of stereopair
base line of the right photograph of stereopair
sum of the base line of stereo pair
mean of the base lines of the stereo pair (Ans)
105. The slotted template method
is prepared, by graphical method
is suitable for large areas with less control
is rapid and accurate
may be done on any scale
all the above (Ans)
106. Parallax bar measures
parallax
height
parallax difference (Ans)
height difference
107. The difference of height of two points whose parallax difference is 0.8 mm on a pair of stereo pair taken from a height H is 100 m. If mean photo base is 95.2 mm, the flying height is
8000 m
10000 m
12000 (Ans)
14000 m
108. The stereo plotting instruments are generally manufactured on the principle of
optical projection
optical mechanism projection
mechanical projection
all the above (Ans)
109. α and β are the angles subtended by a point of elevation h at their air station with respective plumb points. Photo scale and focal length of the lens being S and f respectively. Parallax displacement of the point due to relief, is
h tan α/S
h tan β/S
h(tan α + tan β)/S (Ans)
h(tan α – tan β)/S
110. The displacement of the pictured position of a point of h elevation on a vertical photograph taken with a camera of 30 cm focal length, from an altitude of 3000 m, is
4.4 mm
5.5 mm
6.5 mm
7.5 mm (Ans)
10 mm
111. Rotation of the camera at exposure about its vertical axis, is known as
swing (Ans)
tilt
tip
none of these
112. Rotation of the camera at exposure about horizontal axis normal to the line of flight, is known as
swing
tilt
tip (Ans)
none of these
113. Rotation of the camera at exposure about the line of flight, is known as
swing
tilt (Ans)
tip
none of these
114. The rate of change of parallax dp/dh with respect to change in h, may be expressed as
fB(H-h)
fB(H-h)2 (Ans)
fB(H+h)
fB(H+h)2
115. The difference of parallax for a given difference in elevation is independent of
focal length of the camera
overall size of the photo graphs
percentage of overlap
all the above (Ans)
116. The parallax equation Δp = (BmΔh/H-h) is applicable to entire overlap of the photographs only if parallax is measured
normal to base line
parallel to base line (Ans)
both (a) and(b)
neither (a) nor (b)
117. Assuming human normal vision distance 25 cm, smallest measurable angle 20”, and introcular distance 6.5 cm, the smallest depth to be discerned is
0.1 mm (Ans)
0.5 mm
1.00 mm
1.1 mm
118. To obtained photographs of an area of 1000 m average elevation, on scale 1:30000, with a camera of 30 cm focal length, the flying height is
4000 m
5000 m
6000 m(Ans)
7000 m
119. Homologous points are
opposite corners of a photograph
nodal points of the camera lens
corresponding points on the ground and photograph (Ans)
plumb points of stereo pair of photographs
120. The following points form a pair of homologous points:
photo principal point and ground principal point
photo isocentre and ground isocentre
photo plumb point and ground plumb point
all the above (Ans)
121. A plate parallel is the line on the plane of the negative
parallel to the principal line
perpendicular to the principal line (Ans)
along the bisector of the angle between the principal line and a perpendicular line through principal plane
none of these
122. For plane ground the scale of a vertical photograph will be same as that of a tiled photograph along the photo parallel through
isocentre (Ans)
plumb point
principal point
none of these
123. If v,t and f/H are the ground speed of the aircraft, the shutter speed of the camera and the scale of the photograph respectively, then the amount of image displacement
i = v.t.H/f
i = v.f/t.H (Ans)
i = v.t (f/H)
i = tH/v.f
124. the parallax of a point on the photograph is due to
ground elevation
flying height
length of air base
focal length of the camera
all the above (Ans)
125. The want of correspondence in stereo photographs
is a good property
is a function of tilt (Ans)
is not affected by the change of flying height between photographs
is minimum when θ is 3o
126. 23cm * 23cm photographs are taken from a flying height with a camera of focal length of 3600 m and 15.23 cm respectively. A parallax difference of 0.01 mm represents
1 m (Ans)
2 m
3 m
4 m
5 m
127. The rotation of aircraft about the line of flight, is designated by the letter
ω, and is simetimes called ‘roll’ (Ans)
φ, and is simetimes called ‘pitch’
χ, and is simetimes called ‘swing’
none of these
128. The rotation of aircraft about Z-axis, is designated by the letter
ω, and is simetimes called ‘roll’
φ, and is simetimes called ‘pitch’
χ, and is simetimes called ‘swing’ (Ans)
none of these
129. The rotation of aircraft about Y-axis, is designated by the letter
ω, and is simetimes called ‘roll’
φ, and is simetimes called ‘pitch’ (Ans)
χ, and is simetimes called ‘swing’
none of these
130. If the distance between the projectors is altered by a movement along X-axis of one projector,
the length of the air base is increased
the scale of the model is altered
y-parallax is not affected
relative orientation is not affected
all the above (Ans)
131. By raising the z-column of right projector, maximum y-parallax is introduced in the model at
position 1
position 2
position 4
position 6
position 4 and 6 (Ans)
132. By applying clockwise swing to right projector, maximum y-parallax is introduced in the model at
position 1 (Ans)
position 2
position 4
position 6
133. The movement of the projector in y-direction, introduces i the model a y-parallax
maximum at position 1
maximum at position 2
maximum at position 5 and 6
maximum at position 3 and 4
equally throughout the model (Ans)
134. The method of surveying by triangulation was first introduced by the Dutchman Snell in
1600
1615 (Ans)
1630
1650
1680
135. In triangulation surveys
the area is divided into triangular figures
control stations are located from which detailed surveys are carried out
sides are not measured excepting the baseline
angular measurements are only resorted to
all the above (Ans)
136. Triangulation surveys
planimetric control
height control
both planimetric and height control (Ans)
none of these
137. Triangulation surveys are carried out for locating
control points for surveys of large areas
control points for photogrammetric surveys
engineering works, i.e. Terminal poibts of long tunnels, bridge abutments, etc.
All the above (Ans)
138. Invar tapes used for measuring base lines, is made of nickel-iron alloy containing nickel
24 %
36 % (Ans)
40 %
60 %
139. Limiting gradient for locating the base line on evenly-sloping ground, is
1 in 12 (Ans)
1 in 10
1 in 8
1 in 6
140. The correction applied to the measured base of length L is
tension = (P – PS)L/AE
sag = (L3w2/24P2) where w is the weight of tape/m
slope = (h2/2L + h4/8L3 ) where h is height difference of end supports
reduction to mean sea level = Lh/R
all the above (Ans)
141. The negative sign is assigned to
reduction to mean sea level
correction for horizontal alignment
correction for slope
correction for slope
all the above (Ans)
142. The station where observations are not made, but the angles at the station are used in triangulation series, is known as
satellite station
subsidiary station
pivot station (Ans)
main station
143. The station which is selected close to the main triangulation station, to avoid intervening obstruction, is not known as
satellite station
eccentric station
false station
pivot station (Ans)
144. Systematic errors
always follow some definite mathematical law
can be removed by applying corrections to the observed values
either make the result too great or too small
are also known as cumulative errors
all the above (Ans)
145. accidental errors
do not follow any definite mathemetical law
cannot be removed by applying corrections to the observed values
are generally small
are also known as compensating errors
all the above (Ans)
146. The equation which is obtained by multiplying each equation by the coefficient of its unknowns and by adding the equations thus formed, is known as
observation equation
conditional equation
normal equation (Ans)
none of these
147. In observations of equal precision, the most probable values of the observed quantities are those that render the sum of the squares of the residual errors a minimum, is the fundamental principle of
gauss’ mid latitude formula
delamber’s method
legendr’s method
least square method (Ans)
148. The moon rotates round the earth once in every
29 days
29.35 days (Ans)
29.53 days
30 days
149. The time interval between successive transits of the moon, is
24 hours 10 minutes
20 hours 25 minutes
24 hours 50 minutes (Ans)
23 hours 50 minutes
23 hours 25 minutes
150. The solar tidal force divided by lunar tidal force is
1/3
1/2 (Ans)
3/4
5/4
151. Spring tides are caused when
sun and moon are in line with earth
solar tidal force acts opposite to lunar tidal force
solar tidal force and lunar tidal force both coincide (Ans)
none of these
152. the station pointer is generally used in
triangulation surveying
astronomical surveying
hydrographical surveying (Ans)
photogrammetric surveying
153. An aerial photograph may be assumed as
parallel projection
orthogonal projection
central projection (Ans)
none of these
154. perspective centre relates to
parallel projection
orthogonal projection
central projection (Ans)
none of these
155. The point where vertical line passing through the perspective centre intersects the plane of the photograph, is known as
photo plumb point (Ans)
plumb point
nadir point
isocentre
none of these
156. The orthogonal projection of the perspective centre on a tilted photograph, is called
nadir
isocentre
principal point (Ans)
plumb point
157. The distance between the projection centre and the photograph, is called
principal distance (Ans)
principal line
isocentre distance
focal length
158. The principal line is the line joining the principal point and
nadir
isocentre (Ans)
perspective centre
none of these
159. The principal plane contains
nadir point
isocentre
principal point
principal axis and principal line
all the above (Ans)
160. To have greatest coverage of the area, the type of photography used, is
high oblique (Ans)
low oblique
vertical
none of these
161. The coverage is least if photography is
high oblique
low oblique
vertical (Ans)
none of these
162. H is the flying height above mean ground level and f is the principal distance of a vertical photograph. The mean scale of the photographs is
H.f (Ans)
H/f
f/H
H + f
none of these
163. The scale of the photography taken from a height of 300 m, with a camera of focal length 15cm, is
1:10000
1:15000
1:20000 (Ans)
1:30000
164. The flying height of the camera is 1000 m above mean ground level, the distance of the top of a minar from a nadir point is 10 cm and the relief displacement of minar is 7.2 mm. The height of the minar, is
52 m
62 m
72 m (Ans)
82 m
165. The relief displacement of minar 72 m high on photograph is 7.2 mm and its top appears 10cm away from principal point. The flying height of the camera, is
500 m
1000 m (Ans)
1500 m
2000 m
166. The average eye base is assumed as
58 mm
60 mm
62 mm
64 mm
72 mm (Ans)
167. In field astronomy, the quantities observed are entirely
lengths
angles (Ans)
heights
all of these
168. The main object of the astronomer to obtain
astronomical latitude
astronomical longitude
astronomical bearing
all of these (Ans)
169. The nautical mile is the length of
1 minute of latitude
1 minute of longitude (Ans)
1 degree of latitude
1 degree of longitude
170. If two points differing by 1o of latitude and of the same longitude is 110 km apart on the earth, then two astronomical positions on the moon is about
10 km
25 km
30 km (Ans)
50 km
171. Stellar astronomy deals with
plane surveying
geodetic surveying
star observations (Ans)
planet observations
172. The nearest star is so far away from the earth that the directions to it from two diametrically opposites points on the earth deffers less than
0.01 second
0.001 second
0.0001 second (Ans)
none of these
173. A star in northern sphere is said to transit
when its altitude is maximum
when its azimuth is 180o
when it is in south
all the above (Ans)
174. The angle between the axis of earth and the vertical at the station of observation is called
astronomical latitude
astronomical co-latitude (Ans)
co-declination of star
declination of star
175. The angle between the direction of star and the direction of earth’s axis of rotation is called
co-declination (Ans)
co-latitude
declination
latitude
176. When a star transits at the zenith
the astronomical triangle becomes of the largest area
the astronomical triangle reduces to an arc joining the pole and the zenith
the angle of elevation of the star is 90o
all the above (Ans)
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