০০। A body floating in a liquid is said to be in a stable equilibrium, if its metacentre coincides with its centre of gravity.
ক) True
খ) False
০১। A body floating in a liquid is said to be in neutral equilibrium, if its metacentre
ক) coincides with its centre of gravity
খ) lies above its centre of gravity
গ) lies below its centre of gravity
ঘ) lies between the centre of buoyancy and centre of gravity
০২। A body floating in a liquid is said to be not in equilibrium if its metacentre lies below its centre of gravity.
ক) Agree
খ) Disagree
০৩। A channel is said to be of most economical cross-section, if
ক) it gives maximum discharge for a given cross-sectional area and bed slope
খ) it has minimum wetted perimeter
গ) it involves lesser excavation for the designed amount of discharge
ঘ) all of the above
০৪। A closed tank is completely filled with an oil. If it is made to move with a horizontal acceleration, then the pressure at the back end will be more than that at the front end.
ক) Correct
খ) Incorrect
০৫। A compound pipe is required to be replaced by a new pipe. The two pipes are said to be equivalent, if
ক) length of both the pipes is same
খ) diameter of both the pipes is same
গ) loss of head and discharge of both the pipes is same
ঘ) loss of head and velocity of flow in both the pipes is same
০৬। A compound pipe of diameter d1, d2 and d3 having lengths l1, l2 and l3 is to be replaced by an equivalent pipe of uniform diameter d and of the same length (l) as that of the compound pipe. The size of the equivalent pipe is given by
ক)
খ)
গ)
ঘ)
০৭। A differential manometer is used to measure
ক) atmospheric pressure
খ) pressure in pipes and channels
গ) pressure in venturimeter
ঘ) difference of pressures between two points in a pipe
০৮। A flow in which each liquid particle does not have a definite path and the paths of individual particles also cross each other, is called turbulent flow.
ক) Agree
খ) Disagree
০৯। A flow in which each liquid particle has a definite path, and the paths of individual particles do not cross each other, is called
ক) steady flow
খ) uniform flow
গ) streamline flow
ঘ) turbulent flow
১০। A flow in which the quantity of liquid flowing per second is constant, is called __________ flow.
ক) steady
খ) streamline
গ) turbulent
ঘ) unsteady
১১। A flow in which the quantity of liquid flowing per second is not constant, is called
ক) streamline flow
খ) turbulent flow
গ) steady flow
ঘ) unsteady flow
১২। A flow in which the viscosity of fluid is dominating over the inertia force is called
ক) steady flow
খ) unsteady flow
গ) laminar flow
ঘ) turbulent flow
১৩। A flow in which the volume of a fluid and its density does not change during the flow is called __________ flow.
ক) incompressible
খ) compressible
১৪। A flow in which __________ force is dominating over the viscosity is called turbulent flow.
ক) elastic
খ) surface tension
গ) viscous
ঘ) inertia
১৫। A flow is called hyper-sonic, if the Mach number is
ক) less than unity
খ) unity
গ) between 1 and 6
ঘ) none of these
১৬। A flow is called sonic, if the Mach number is unity.
ক) Agree
খ) Disagree
১৭। A flow is called sub-sonic, if the Mach number is
ক) less than unity
খ) unity
গ) between 1 and 6
ঘ) more than 6
১৮। A flow is called super-sonic if the
ক) velocity of flow is very high
খ) discharge is difficult to measure
গ) Mach number is between 1and 6
ঘ) none of these
১৯। A flow through a long pipe at constant rate is called