Related Questions

"An Electromagnetic wave falls on to a boundary between two losses less homogeneous media with different refractive indices, a part of the wave is reflected back to the incident medium and the rest is transmitted on to the second media". This phenomenon is known as:
A Fresnel reflection
B Fresnel refraction
C Snell's law
D None of these
When a wave strikes a vertical breakwater in deep water, it is reflected back and on meeting another advancing wave of similar amplitude merges and rises vertically in a wall of water. This phenomenon is called
A Surf
B Clapotis
C Fetch
D Swell
If ‘Hs’ is the significant wave height, then the average wave height and highest wave height respectively are given by
A 0.6 Hs and 1.67 Hs
B 0.6 Hs and 1.87 Hs
C 1.27 Hs and 1.87 Hs
D 1.27 Hs and 1.67 Hs
Sound waves do not show the phenomenon of
A Refraction
B Interference
C Diffraction
D Polarisation
Which of the following phenomenon is considered responsible for Global Warming?
A Greenhouse effect
B Fire in coal mines
C Dry farming
D Monsoon
E Trade winds
When the Sun is near the horizon during the morning or evening, it appears reddish. The phenomenon that is responsible for this observation is
A Reflection of light
B Refraction of light
C Dispersion of light
D Scattering of light
Which one is the plural of 'Echo'?
A echos
B echoes
C echoin
D echous
Echo এর সঠিক Plural -
A Echos
B Echoes
C Echoistic
D Echoed
What is the minimum distance (in metres) required to hear an echo?
A 10
B 13
C 17
D 21
When used in conjunction with a radar set, the purpose of an echo box is to provide an artificial target.
A Which may be used to tune the radar synchronizer
B Which may be used to tune the radar receiver
C To the tone of the pulse repetition
D Tune the magnetron to the correct frequency

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