A. 10-10 to 106 m
B. 10-8 to 106 m
C. 10-10 to 1010 m
D. 10-8 to 108 m
A. Produces a time varying magnetic field and vice versa
B. Once generated, remains self-propagating
C. Is capable to travel across space
D. All of these
A. When the electric field oscillates in the direction of the electric vector, a plane polarised wave is formed
B. When the electric vector is in the plane of incidence, vertical polarisation is formed
C. When the electric vector is at right angles to the plane of incidence, horizontal polarization wave is formed
D. All of these
A. Focal length
B. Flying height
C. Ground elevation
D. None of these
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
A. Colour
B. Symbology
C. Legends
D. South arrow
A. Electronic clocks
B. Atomic clocks
C. Quartz clocks
D. Mechanical clocks