Are not affected by change in pressure and temperature
None of the above
Correct answer: (D) None of the above
2. A balloon lifting in air follows the following principle
Law of gravitation
Archimedes principle
Principle of buoyancy
All of the above
Correct answer: (D) All of the above
3. A body floating in a liquid is said to be in neutral equilibrium, if its metacentre
Coincides with its centre of gravity
Lies above its centre of gravity
Lies below its centre of gravity
Lies between the centre of buoyancy and centre of gravity
Correct answer: (A) Coincides with its centre of gravity
4. A body floats in stable equilibrium
When its meatcentric height is zero
When the metacentre is above e.g.
When its e.g. is below its center of buoyancy
Metacentre has nothing to do with position of e.g. for determining stability
Correct answer: (B) When the metacentre is above e.g.
5. A bucket of water is hanging from a spring balance. An iron piece is suspended into water without touching sides of bucket from another support. The spring balance reading will
Increase
Decrease
Remain same
Increase/decrease depending on depth of immersion
Correct answer: (C) Remain same
6. A channel is said to be of most economical cross-section, if
It gives maximum discharge for a given cross-sectional area and bed slope
It has minimum wetted perimeter
It involves lesser excavation for the designed amount of discharge
All of the above
Correct answer: (D) All of the above
7. A compound pipe is required to be replaced by a new pipe. The two pipes are said to be equivalent, if
Length of both the pipes is same
Diameter of both the pipes is same
Loss of head and discharge of both the pipes is same
Loss of head and velocity of flow in both the pipes is same
Correct answer: (C) Loss of head and discharge of both the pipes is same
8. 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
l/d2 = (l2/d22) + (l3/d32)
l/d3 = (l2/d23) + (l3/d33)
l/d4 = (l2/d24) + (l3/d34)
l/d5 = (l2/d25) + (l3/d35)
Correct answer: (D) l/d5 = (l2/d25) + (l3/d35)
9. A differential manometer is used to measure
Atmospheric pressure
Pressure in pipes and channels
Pressure in Venturimeter
Difference of pressures between two points in a pipe
Correct answer: (D) Difference of pressures between two points in a pipe