civil engineering MCQs – Page 294

Practise multiple-choice questions from civil engineering for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

civil engineering Mcqs
5861. Pick up the correct statement from the following?
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A. Polarising angle of glass is 57.5

B. At the polarising angle, the reflected and refracted rays are orthogonal

C. The minimum frequency of light for which no electrons are emitted, is called threshold frequency

D. All the above
5862. The normal altitude of GPS satellite is about________________?
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A. 16,200 km

B. 20,200 km

C. 24,400 km

D. 36,100 km

5863. The entire range of the electromagnetic spectrum spans a large spectrum of wave lengths varying from__________________?
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A. 10-10 to 106 m
5864. Pick up the correct statement from the following ?
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A. All of these

B. The reference for finding the phase of a wave is taken from the previous passage through zero from the negative to the positive direction

C. Phase is usually specified by angular measure with one period being 360

D. Phase of a wave is expressed as a fraction of a period with respect to a reference

5865. Which one of the following parameters is accurate for DGPS ?
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A. Positional accuracies ~ 1 2 m if rover is less than 1-2 km from the reference station

B. Positional accuracies ~ 5 10 m if rover is less than 25 km

C. Positional accuracies ~ 5 10 m if rover is less than 5-10 km from reference station

D. Positional accuracies ~ 2 5m if rover is less than 2-5 fm from the reference station

5866. The ratio of the total solar radiant energy returned by a planetary body to the total radiant energy incident on the body, the called________________?
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A. Albedo

B. None of these

C. Reflectance

D. Reflectance factor

5867. Repetitive observations of the same area at equal interval of time are useful to monitor the dynamic phenomena________________?
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A. Vegetative cover

B. Snow cover

C. All of these

D. Cloud evolution

5868. If electric permittivity and magnetic permeability of the medium are respectively and , then the velocity (Cm) of the electromagnetic wave in the medium is given by___________________?
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A. Cm

B. Cm

C. Cm = 1/

D. None of these

5869. Pick up the correct statement from the following ?
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A. The changes in the polarisation of the radiation reflected or emitted by an object, is known as polarisation variation

B. A graphical representation of spectral reflectance verses the various growth stages of a crop, depicts a phonologic pattern

C. The degree of polarisation is a characteristic of the object which helps in the identification of the object

D. All of these
5870. sensor IFOV is proportional to_________________?
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A. cos2

B. tan2

C. sin2

D. sec2
5871. The GPS space segment consists of Navigation Satellite Timing and Ranging whose number is_______________?
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A. 24

B. 12

C. 16

D. 8

5872. For C band Synthetic Aperture Radar (SAR) with Doppler band width of 1300 Hz, the coherence length loch is_____________?
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A. 250 km

B. 500 km

C. 130 km

D. 230 km
5873. The arrangement of terrain features which provides attributes: the shape, size and texture of objects, is called_________________?
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A. Temporal variation

B. None of these

C. Spectral variation

D. Spatial variation
5874. Coherence of two electromagnetic waves takes place if their phase difference is_________________?
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A. Constant in time and space

B. Constant in space

C. None of these

D. Constant in time

5875. If flying height of a spacecraft is H, the length of air base is B and the parallax difference between two points is dp, then the difference in height___________________?
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A. h = (B/H) dp

B. h = (H/B) dp

C. h = dp/(H/B)

D. h = dp/(B/H)
5876. Who coined the term, Remote sensing_______________?
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A. Evelyn L. Pruitt, a geographer

B. None of these

C. Gaspard Felix Tournachon, a French scientist

D. Wilbur Wright, an Italian scientist

5877. Which one of the following helps to identify the objects on the earth surface ?
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A. Atmospheric window

B. None of these

C. Signature

D. Radiometric error

5878. DGPS is based on the concept that bias errors in the position of locations in a given local area, are same if their distances are within___________________?
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A. 50 km

B. 75 km

C. 25 km

D. 100 km
5879. Which one of the following quantities forms the basis of radiometry ?
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A. Radiant energy (Q)

B. All of these

C. Radiant intensity (I)

D. Radiant flux (?e )

5880. In GPS, receivers used are___________________?
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A. Mechanical clocks

B. Quartz clocks

C. Atomic clocks

D. Electronic clocks