Related Questions

Why does a cannon recoil after firing ?
A Conservation of energy
B Backward thrust of gases produced
C Newton's third law of motion
D Newton's first law of motion
If you scored a cannon, which game would you be playing?
A football
B billiards
C cricket
D hockey
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
When a wave is incident from the more dense into a less dense medium at an angle equal to or exceeding the critical angle, the wave suffers total internal __________ .
A Reflection
B Refraction
C Transmission
D None of the above
The wave in wave guide has
A Group velocity inversely proportional to wavelength
B Larger frequency than in the free space
C Diminishing wavelength than in the free space
D Larger wavelength than in the free space
"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
The instruments which provide electromagnetic radiation of specified wave length or a band of wave lengths to illuminate the earth surface are called:
A Sensors
B Passive sensors
C Active sensors
D None of these
For wave action in dams, the maximum height of freeboard is generally taken to be equal to (where hw is height of wave.)
A 0.5 hw
B 0.75 hw
C 1.25 hw
D 1.50 hw
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
Why are we able to hear short wave broadcasts better than long wave broadcasts ?
A Short waves are more energetic than long waves.
B Short waves are unaffected by atmospheric disturbances.
C Short wave broadcasts are made by nearby radio stations.
D By convention, short waves are meant for long distances, whereas long waves are reserved for short distances.

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