According to the principle of buoyancy a body totally or partially immersed in a fluid will be lifted up by a force equal to_________________?
(A) the weight of the body
(B) more than the weight of the body
(C) less than the weight of the body
(D) weight of the fluid displaced by the body
(D) weight of body plus the weight of the fluid displaced hy the body
A ship whose hull length is 100 m is to travel at 10 m/sec. For dynamic similarity, at what velocity should a 1:25 model be towed through water ?
(A) 10 m/sec
(B) 25 m/sec
(C) 2 m/sec
(D) 50 m/sec
(D) 250 m/sec
A model of torpedo is tested in a towing tank at a velocity of 25 m/sec. The prototype is expected to attain a velocity of 5 m/sec. What model scale has been used ?
(A) 1 : 5
(B) 1 : 2.5
(C) 1 :25
(D) 1:V5″
(D) 1 : 53/2
For a floating body to be in stable equilibrium, its metacentre should be___________________?
(A) below the center of gravity
(B) below the center of buoyancy
(C) above the center of buoyancy
(D) between e.g. and center of pressure
(D) above the center of gravity
The two important forces for a floating body are__________________?
(A) buoyancy, gravity
(B) buoyancy, pressure
(C) buoyancy, inertial
(D) inertial, gravity
(D) gravity, pressure
Center of pressure on an inclined plane is___________________?
(A) at the centroid
(B) above the centroid
(C) below the centroid
(D) at metacentre
(D) at center of pressure
The centre of gravity of the volume of the liquid displaced by an immersed body is called ___________________?
(A) centre of gravity
(B) centre of pressure
(C) metacentre
(D) centre of buoyancy
(D) centroid
The pressure in the air space above an oil (sp. gr. 0.8) surface in a tank is 0.1 kg/cm”. The pressure at 2.5 m below the oil surface will be __________________?
(A) 2 metres of water column
(B) 3 metres of water column
(C) 3.5 metres of water column
(D) 4 m of water column
(D) none of the above
In an immersed body, centre of pressure is __________________?
(A) at the centre of gravity
(B) above the centre of gravity
(C) below be centre of gravity
(D) could be above or below e.g. depend¬ing on density of body and liquid
(D) unpredictable
The speed of sound in a ideal gas varies directly as its__________________?
(A) pressure
(B) temperature
(C) density
(D) modulus of elasticity
(D) absolute temperature