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)
The overlap of batten plates with the main members in welded connections should be more than____________________?
(A) 3t
(B) 4t
(C) 6t
(D) 8t where t = thickness of the batten plate
Economical depth of a plate girder corresponds to_________________?
(A) minimum weight
(B) minimum depth
(C) maximum weight
(D) minimum thickness of web
The ratio of the total solar radiant energy returned by a planetary body to the total radiant energy incident on the body, the called________________?
(A) Reflectance
(B) Reflectance factor
(C) Albedo
(D) None of these
Which one of the following statement is incorrect regarding the electromagnetic radiation ?
(A) These are produced by the motion of electric charge
(B) The oscillation of charged particles sets up changing electric fields
(C) The changing electric fields induce the changing magnetic fields in the surrounding medium
(D) None of these