Which one of the following parameters is considered to determine the reflectance of a vegetation canopy ?

A. Solar zenith angle
B. Azimuth angle
C. Look angle
D. All of these

Coherence of two electromagnetic waves takes place if their phase difference is_________________?

A. Constant in time
B. Constant in space
C. Constant in time and space
D. None of these

Repetitive observations of the same area at equal interval of time are useful to monitor the dynamic phenomena________________?

A. Cloud evolution
B. Vegetative cover
C. Snow cover
D. All of these

The coherence length over which there is a strong relationship between amplitudes is_________________?

A. Directly proportional to the bandwidth
B. Inversely proportional to the bandwidth
C. The square of the bandwidth
D. None of these

Formation of snow occurs if the cloud temperature is________________?

A. Just above the freezing point
B. At the freezing point
C. Below the freezing point
D. None of these

If the 20 mm rivets are used in lacing bars, then the minimum width of lacing bar should be______________?

A. 40mm
B. 60mm
C. 80mm
D. 100mm

Lacing bars in a steel column should be designed to resist_________________?

A. Bending moment due to 2.5% of the column load
B. Shear force due to 2.5% of the column load
C. 2.5% of the column load
D. Both (a) and (b)

Battening is preferable when the________________?

A. I) column carries axial load only
B. Ii) space between the two main components is not very large
C. Iii) column is eccentrically loaded
D. The correct answer is

The overlap of batten plates with the main members in welded connections should be more than____________________?

A. 3t
B. 4t
C. 6t
D. 8t

Economical depth of a plate girder corresponds to_________________?

A. Minimum weight
B. Minimum depth
C. Maximum weight
D. Minimum thickness of web