Explore topic-wise MCQs in Civil Engineering.

This section includes 164 Mcqs, each offering curated multiple-choice questions to sharpen your Civil Engineering knowledge and support exam preparation. Choose a topic below to get started.

1.

The movement of the projector in -direction, introduces in the model a -parallax

A. maximum at position 1
B. maximum at position 2
C. maximum at position 5 and 6
D. maximum at positions 3 and 4
E. equally throughout the model.
Answer» F.
Discussion
2.

The parallax equation is applicable to entire overlap of the photographs only if parallax is measured

A. normal to base line
B. parallel to base line
C. both (a) and (b)
D. neither (a) nor (b).
Answer» C. both (a) and (b)
Discussion
3.

The difference of height of two points whose parallax difference is 0.8 mm on a pair of stereo pair taken from a height is 100 m. If mean photo base is 95.2 mm, the flying height is

A. 8,000 m
B. 10,000 m
C. 12,000 m
D. 14,000 m
Answer» D. 14,000 m
Discussion
4.

The displacement of the pictured position of a point of elevation on a vertical photograph taken with a camera of 30 cm focal length, from an altitude of 3000 m, is

A. 4.4 mm
B. 5.5 mm
C. 6.5 mm
D. 7.5 mm
E. 10 mm
Answer» E. 10 mm
Discussion
5.

α and β are the angles subtended by a point of elevation at their air station with respective plumb points. Photo scale and focal length of the lens being and respectively. Parallax displacement of the point due to relief, is

A. .
Answer» D.
Discussion
6.

If α, , and δ be the altitude, hour angle, azimuth and declination of a circumpolar star at its elongation, in latitude λ, the following relation holds good

A. all the above.
Answer» E.
Discussion
7.

A nautical mile is

A. one minute arc of the great circle passing through two points
B. one minute arc of the longitude
C. 6080 ft
D. 1855.109 m
E. all the above.
Answer» F.
Discussion
8.

By raising the -column of right projector, maximum -parallax is introduced in the model at

A. position 1
B. position 2
C. position 4
D. position 6
E. position 4 and 6.
Answer» F.
Discussion
9.

By applying clockwise swing to right projector, maximum -parallax is introduced in the model at

A. position 1
B. position 2
C. position 4
D. position 6.
Answer» B. position 2
Discussion
10.

If is the focal length of the camera lens and θ is the angle of tilt, the distance of the plumb point from the principal point will be

A. sin θ
B. cos θ
C. tan θ
D. sec θ.
Answer» D. sec θ.
Discussion
11.

is the flying height above mean ground level and is the principal distance of a vertical photograph. The mean scale of the photographs is

A. .
B. +
C. none of these.
Answer» D.
Discussion
12.

If is the sum of three angles of a spherical triangle, the spherical excess equals

A. - 90°
B. - 180°
C. - 270°
D. - 360°.
Answer» C. - 270°
Discussion
13.

Longitudes are measured from 0° to

A. 180° eastward
B. 180° westward
C. 180° east or westward
D. 360° eastward
E. 360° westward.
Answer» D. 360° eastward
Discussion
14.

If the distance between the projectors is altered by a movement along -axis of one projector,

A. the length of the air base is increased
B. the scale of the model is altered
C. -parallax is not affected
D. relative orientation is not affected
E. all the above.
Answer» F.
Discussion
15.

For a spherical triangle , pick up incorrect statement

A. none of these.
Answer» E.
Discussion
16.

If δ is the declination of the star and φ is the latitude of the observer, then the azimuth of the star at elongation is given by

A. sin z = sec φ . cos δ
B. cos z = sec φ . cos δ
C. tan z = sec φ . cos δ
D. none of these.
Answer» B. cos z = sec φ . cos δ
Discussion
17.

If δ is the declination of the star and φ is the latitude of the observer then the hour angle of the star at elongation is given by

A. sin H = tan φ . cot δ
B. cos H = tan φ . cot δ
C. tan H = tan φ . cot δ
D. none of these.
Answer» C. tan H = tan φ . cot δ
Discussion
18.

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

A. H . f
B. [B].
C. [C].
D. H + f
E. none of these.
Answer» D. H + f
Discussion
19.

The correction applied to the measured base of length L is

A. [A].
B. where w is the weight of tape/m
C. where h is height difference of end supports
D. Reduction to mean sea level =
E. all the above.
Answer» F.
Discussion
20.

If v, t and 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

A. [A].
B. [B].
C. [C].
D. [D].
Answer» D. [D].
Discussion
21.

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

A. [A].
B. [B].
C. [C].
D. .
Answer» D. .
Discussion
22.

The scale of a vertical photograph of focal length f taken from height of H metres above M.S.L., at a point of reduced level h, is

A. [A].
B. [B].
C. [C].
D. [D].
Answer» D. [D].
Discussion
23.

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 principal point will be

A. f sin θ
B. f cos θ
C. f tan θ
D. f sec θ.
Answer» D. f sec θ.
Discussion
24.

If δ is the declination of the Polaris and λ is the latitude of the place, the azimuth of the polaris, is

A. [A].
B. [B].
C. [C].
D. .
Answer» B. [B].
Discussion
25.

The length of a parallel of λ latitude between two meridians is equal to difference in logitudes multiplied by

A. sin λ
B. cos λ
C. tan λ
D. cot λ.
Answer» C. tan λ
Discussion
26.

For a spherical triangle ABC, pick up incorrect statement

A. [A].
B. [B].
C. [C].
D. [D].
E. none of these.
Answer» E. none of these.
Discussion
27.

Parallax bar measures

A. Celestial bodies though fixed, appear to revolve from east to west round the celestial pole.
B. All the above.
C. parallax
D. height
Answer» D. height
Discussion
28.

For mapping any country

A. all the above.
B. geodetic triangulation of greatest possible sides and accuracy is carried out
C. primary triangles are broken down into secondary triangles of somewhat lesser accuracy
D. secondary triangles are further broken into third and fourth order triangles, the points of which are used for detail surveys
Answer» E.
Discussion
29.

Latitude of the observer's position is equal to altitude of

A. all the above.
B. north pole
C. pole star
D. celestial pole
Answer» D. celestial pole
Discussion
30.

To obtain photographs of an area of 1000 m average elevation, on scale 1 : 30, 000, with a camera of 30 cm focal length, the flying height is

A. Longitudes east of Greenwich are taken as negative
B. Longitudes west of Greenwich are taken as positive.
C. Both (c) and (d) of the above.
D. 4000 m
Answer» D. 4000 m
Discussion
31.

The nautical mile is the length of

A. 1 minute of latitude
B. 1 minute of longitude
C. 1 degree of latitude
D. 1 degree of longitude.
Answer» C. 1 degree of latitude
Discussion
32.

The sun's declination remains north between

A. March 21 to June 21
B. June 21 to September 21
C. September 21 to December 21
D. December 21 to Mach 21
Answer» E.
Discussion
33.

Polaris is usually observed for the determination of the latitude when it is

A. 1 in 6.
B. at culmination
C. at elongation
D. neither at culmination nor at elongation
Answer» B. at culmination
Discussion
34.

In a tropical year, the number of sidereal days are

A. .
B. one less than mean solar days
C. one more than mean solar days
D. equal to mean solar days
Answer» C. one more than mean solar days
Discussion
35.

At eastern elongation, the pole star moves

A. eastward
B. westward
C. northward
D. southward.
Answer» D. southward.
Discussion
36.

The rate of change of parallax dp/dh with respect to change in h, may be expressed as

A. 400 km.
B. fB/(H - h)
C. fB/(H - h)2
D. fB/(H + h)
Answer» C. fB/(H - h)2
Discussion
37.

The parallax of a point on the photograph is due to

A. ground elevation
B. flying height
C. length of air base
D. focal length of the camera.
Answer» E.
Discussion
38.

The value of geo-centric parallax to be added to the observed altitude of sun is

A. 58 cos α.
B. 9" cos α
C. 9" sin α
D. 9" tan α
Answer» B. 9" cos Œ±
Discussion
39.

If θ and δ be the latitude of a place and declination of a star respectively, the upper culmination of the star will be north of zenith if its zenith distance, is

A. all the above.
B. δ - θ
C. θ - δ
D. θ + δ
Answer» B. Œ¥ - Œ∏
Discussion
40.

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

A. 22° 30'
B. 23° 27'
C. 23° 30'
D. 24° 0'.
Answer» C. 23¬∞ 30'
Discussion
41.

The elevation of the star at elongation is obtained by

A. sin α = sin φ cosec δ
B. sin α = sin φ sec δ
C. sin α = cos φ sec δ
D. sin α = cos φ cosec δ.
Answer» B. sin Œ± = sin œÜ sec Œ¥
Discussion
42.

The station where observations are not made, but the angles at the station are used in triangulation series, is known as

A. satellite station
B. subsidiary station
C. pivot station
D. main station.
Answer» D. main station.
Discussion
43.

Accidental errors

A. do not follow any definite mathematical law
B. cannot be removed by applying corrections to the observed values
C. are generally small
D. are also known as compensating errors
Answer» E.
Discussion
44.

If α is the observed altitude, the refraction correction in seconds, is

A. 58" cot α
B. 58" tan α
C. 58 sin α
D. 58 cos α.
Answer» B. 58" tan Œ±
Discussion
45.

The point where a vertical line through the optical centre of the camera lens intersects the ground, is known as

A. ground principal point
B. ground plumb point
C. iso-centre
D. perspective centre.
Answer» C. iso-centre
Discussion
46.

Pick up the correct statement for horizontal photographs.

A. Parallel lines do not appear parallel in central projection
B. The two sides of a road meet at the vanishing point
C. The lines parallel to the negative plane are projected as parallel lines
D. All the above.
Answer» E.
Discussion
47.

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

A. Gauss' Mid Latitude formula
B. Delamber's method
C. Legendr's method
D. Least square method.
Answer» E.
Discussion
48.

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 principal point will be

A. f sin θ
B. f cos θ
C. f tan θ
D. f sec θ.
Answer» D. f sec Œ∏.
Discussion
49.

The latitude of a place was obtained by subtracting the declination of a star from its zenith distance, the observed star was between

A. horizon and equator
B. zenith and pole
C. equator and zenith
D. pole and horizon.
Answer» B. zenith and pole
Discussion
50.

Right ascension of a heavenly body is its equatorial angular distance measured

A. westward from the first point of Libra
B. eastward from the first point of Aeries
C. westward from the first point of Aeries
D. eastward from the first point of Libra.
Answer» C. westward from the first point of Aeries
Discussion