Home
Current Affairs January 2024

What is the correct answer?

4

The centre of pressure acts __________ the centre of gravity of immersed surface.

A. At

B. Above

C. Below

D. None of these

Correct Answer :

C. Below


Related Questions

What is the correct answer?

4

Mercury is often used in barometer because

A. It is the best liquid

B. The height of barometer will be less

C. Its vapour pressure is so low that it may be neglected

D. Both (B) and (C)

What is the correct answer?

4

A flow through a long pipe at decreasing rate is called __________ uniform flow.

A. Steady

B. Unsteady

C. Both A and B

D. None of these

What is the correct answer?

4

The normal stress is same in all directions at a point in a fluid

A. Only when the fluid is frictionless

B. Only when the fluid is incompressible and has zero viscosity

C. When there is no motion of one fluid layer relative to an adjacent layer

D. Irrespective of the motion of one fluid layer relative to an adjacent layer

What is the correct answer?

4

Choose the wrong statement

A. Any weight, floating or immersed in a liquid, is acted upon by a buoyant force

B. Buoyant force is equal to the weight of the liquid displaced

C. The point through which buoyant force acts, is called the center of buoyancy

D. Center of buoyancy is located above the center of gravity of the displaced liquid

What is the correct answer?

4

The atmospheric pressure with rise in altitude decreases

A. Linearly

B. First slowly and then steeply

C. First steeply and then gradually

D. Unpredictable

What is the correct answer?

4

The fluid forces considered in the Navier Stokes equation are

A. Gravity, pressure and viscous

B. Gravity, pressure and turbulent

C. Pressure, viscous and turbulent

D. Gravity, viscous and turbulent

What is the correct answer?

4

Choose the wrong statement. Alcohol is used in manometer, because

A. Its vapour pressure is low

B. It provides suitable meniscus for the inclined tube

C. Its density is less

D. It provides longer length for a given pressure difference

What is the correct answer?

4

Metacentre is the point of intersection of

A. Vertical upward force through e.g. of body and center line of body

B. Buoyant force and the center line of body

C. Midpoint between e.g. and center of buoyancy

D. All of the above

What is the correct answer?

4

Reynolds number is significant in

A. Supersonics, as with projectile and jet propulsion

B. Full immersion or completely enclosed flow, as with pipes, aircraft wings, nozzles etc.

C. Simultaneous motion through two fluids where there is a surface of discontinuity, gravity forces, and wave making effect, as with ship's hulls

D. All of the above

What is the correct answer?

4

For pipes, laminar flow occurs when Reynolds number is

A. Less than 2000

B. Between 2000 and 4000

C. More than 4000

D. Less than 4000

What is the correct answer?

4

The discharge through a channel of circular section will be maximum when the depth of water is __________ the diameter of the circular channel.

A. 0.34 times

B. 0.67 times

C. 0.81 times

D. 0.95 times

What is the correct answer?

4

A flow in which the volume of a fluid and its density does not change during the flow is called _________ flow.

A. Incompressible

B. Compressible

C. Viscous

D. None of these

What is the correct answer?

4

The continuity equation is connected with

A. Open channel/pipe flow

B. Compressibility of fluids

C. Conservation of mass

D. Steady/unsteady flow

What is the correct answer?

4

Cavitation will begin when

A. The pressure at any location reaches an absolute pressure equal to the saturated vapour pressure of the liquid

B. Pressure becomes more than critical pressure

C. Flow is increased

D. Pressure is increased

What is the correct answer?

4

Flow occurring in a pipeline when a valve is being opened is

A. Steady

B. Unsteady

C. Laminar

D. Vortex

What is the correct answer?

4

A channel is said to be of most economical cross-section, if

A. It gives maximum discharge for a given cross-sectional area and bed slope

B. It has minimum wetted perimeter

C. It involves lesser excavation for the designed amount of discharge

D. All of the above

What is the correct answer?

4

A flow in which __________ force is dominating over the viscosity is called turbulent flow.

A. Elastic

B. Surface tension

C. Viscous

D. Inertia

What is the correct answer?

4

An opening in the side of a tank or vessel such that the liquid surface with the tank is below the top edge of the opening, is called

A. Weir

B. Notch

C. Orifice

D. None of these

What is the correct answer?

4

Operation of McLeod gauge used for low pressure measurement is based on the principle of

A. Gas law

B. Boyle's law

C. Charles law

D. Pascal's law

What is the correct answer?

4

When a body floating in a liquid, is displaced slightly, it oscillates about

A. C.G. of body

B. Center of pressure

C. Center of buoyancy

D. Metacentre

What is the correct answer?

4

The resultant upward pressure of the fluid on an immersed body is called

A. Up-thrust

B. Buoyancy

C. Center of pressure

D. All the above are correct

What is the correct answer?

4

Gradually varied flow is

A. Steady uniform

B. Non-steady non-uniform

C. Non-steady uniform

D. Steady non-uniform

What is the correct answer?

4

The discharge through a convergent mouthpiece is __________ the discharge through an internal mouthpiece of the same diameter and head of water.

A. Equal to

B. One-half

C. Three fourth

D. Double

What is the correct answer?

4

Liquids transmit pressure equally in all the directions. This is according to

A. Boyle's law

B. Archimedes principle

C. Pascal's law

D. Newton's formula

What is the correct answer?

4

The discharge through a siphon spillway is

A. Cd × a × √(2gH)

B. Cd × a × √(2g) × H3/2

C. Cd × a × √(2g) × H2

D. Cd × a × √(2g) × H5/2

What is the correct answer?

4

In a footstep bearing, if the speed of the shaft is doubled, then the torque required to overcome the viscous resistance will be

A. Double

B. Four times

C. Eight times

D. Sixteen times

What is the correct answer?

4

The ratio of the inertia force to the viscous force is called

A. Reynold's number

B. Froude's number

C. Weber's number

D. Euler's number

What is the correct answer?

4

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

A. Increase

B. Decrease

C. Remain same

D. Increase/decrease depending on depth of immersion

What is the correct answer?

4

A perfect gas

A. Has constant viscosity

B. Has zero viscosity

C. Is in compressible

D. None of the above

What is the correct answer?

4

The discharge through a wholly drowned orifice is given by (where H1 = Height of water (on the upstream side) above the top of the orifice, H2 = Height of water (on the downstream side) above the bottom of the orifice, and H = Difference between two water levels on either side of the orifice)

A. Q = Cd × bH₁ × √(2gh)

B. Q = Cd × bH2 × √(2gh)

C. Q = Cd × b (H2 - H1) × √(2gh)

D. Q = Cd × bH × √(2gh)