6. An antenna with very high gain and very narrow beamwidth.
(a) helical antenna
(b) discone antenna
(c) horn antenna
(d) parabolic dish antenna
7. What is the radiation characteristic of a dipole antenna ?
(a) omnidirectional
(b) bidirectional
(c) unidirectional
(d) hemispherical
8. An antenna which is one-tenth wavelength long.
(a) hertzian dipole
(b) loop antenna
(c) marconi antenna
(d) elementary doublet
9. ………. is an open-ended slot antenna.
(a) helical antenna
(b) rhombic antenna
(c) notch antenna
(d) cassegrain antenna
10. What is the gain of isotropic antenna ?
(a) 10
(b) 1
(c) 10
(d) 100
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