Related Questions

When a ship floats at its designed water line, the vertical distance from water line to the bottom of the ship is known as
A Beam
B Depth
C Free-board
D Draft
The length of the needle beam used in needle beam method of tunnelling is usually
A 2 m to 4 m
B 2.5 m to 6 m
C 4 m to 7 m
D 5 m to 6 m
If a copper disc is rotated rapidly below a freely suspended magnetic needle, the magnetic needle shall start rotating with a velocity
A less than that of disc but in opposite direction
B equal to that of disc and in the same direction
C equal to that of disc and in the opposite direction
D less than that of disc and in the same direction
A stone ball is dropped into a barrel of water and sinks to the bottom. The ball is completely covered by water .By how much does the water rise in the barrel ?
A 0.42 cm
B 4.2 cm
C 42cm
D Try your self
Because of rumors that the ship's passengers were sick with a terrible plague, the port_ the ship and refused to lit it dock.
A quarentyne
B quarrentined
C quarentine
D quarantined
Protection of ship hulls against sea water corrosion is done by coating with zinc because of the fact that zinc compared to iron is
A Reduced preferentially
B Cheaper
C Oxidised preferentially
D Lighter
Why the needle of iron swims on water surface when it is kept gently ?
A It will remain under the water, when it will displace more water than its weight
B The density of needle is less than that of water
C Due to surface tension
D Due to its shape
The slag which floats on the surface of the molten iron generally contains
A Lime (CaO) 45%
B Silica (SiO2) 35%
C Alumina (Al2O3) 12% and MgO, CaSO4, KMnO2 and FeO 8%
D All the above
When oil floats on water, the surface tension of water
A vanishes immediately
B decreases considerably
C increases considerably
D remains unaffected
A ship leaves port and sails 6 miles west. It then sails 6 miles south ;and then 6 miles west again. Approximately how many miles is the ship from port?
A 9
B 11
C 13
D 15

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