Home
Current Affairs January 2024

What is the correct answer?

4

Fluid is a substance that

A. Cannot be subjected to shear forces

B. Always expands until it fills any container

C. Has the same shear stress at a point regardless of its motion

D. Cannot remain at rest under action of any shear force

Correct Answer :

D. Cannot remain at rest under action of any shear force


Related Questions

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

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

What is the correct answer?

4

The top of the weir over which the water flows is known as

A. Sill or crest

B. Nappe or vein

C. Orifice

D. None of these

What is the correct answer?

4

For similarity, in addition to models being geometrically similar to prototype, the following in both cases should also be equal

A. Ratio of inertial force to force due to viscosity

B. Ratio of inertial force to force due to gravitation

C. Ratio of inertial force to force due to surface tension

D. All the four ratios of inertial force to force due to viscosity, gravitation, surface tension, and elasticity

What is the correct answer?

4

The meatcentric height of a ship is 0.6 m and the radius of gyration is 4 m. The time of rolling of a ship is

A. 4.1 s

B. 5.2 s

C. 10.4 s

D. 14.1 s

What is the correct answer?

4

True one-dimensional flow occurs when

A. The direction and magnitude of the velocity at all points are identical

B. The velocity of successive fluid particles, at any point, is the same at successive periods of time

C. The magnitude and direction of the velocity do not change from point to point in the fluid

D. The fluid particles move in plane or parallel planes and the streamline patterns are identical in each plane

What is the correct answer?

4

The total pressure on the top of a closed cylindrical vessel of radius (r) completely filled up with liquid of specific weight (w) and rotating at (ω) rad/s about its vertical axis, is

A. π w ω² r²/4g

B. π w ω² r³/4g

C. π w ω² r⁴/4g

D. π w ω² r²/2g

What is the correct answer?

4

The mercury does not wet the glass. This is due to the property of the liquid known as

A. Cohesion

B. Adhesion

C. Viscosity

D. Surface tension

What is the correct answer?

4

The length AB of a pipe ABC in which the liquid is flowing has diameter (d1) and is suddenly contracted to diameter (d2) at B which is constant for the length BC. The loss of head due to sudden contraction, assuming coefficient of contraction as 0.62, is

A. v₁²/2g

B. v₂²/2g

C. 0.5 v₁²/2g

D. 0.375 v₂²/2g

What is the correct answer?

4

In a free nappe,

A. The pressure below the nappe is atmospheric

B. The pressure below the nappe is negative

C. The pressure above the nappe is atmospheric

D. The pressure above the nappe is negative

What is the correct answer?

4

A flow in which the quantity of liquid flowing per second is constant, is called __________ flow.

A. Steady

B. Streamline

C. Turbulent

D. Unsteady

What is the correct answer?

4

The units of dynamic or absolute viscosity are

A. Metres² per sec

B. kg sec/meter

C. Newton-sec per meter

D. Newton-sec² per meter

What is the correct answer?

4

A pitot tube is used to measure the

A. Velocity of flow at the required point in a pipe

B. Pressure difference between two points in a pipe

C. Total pressure of liquid flowing in a pipe

D. Discharge through a pipe

What is the correct answer?

4

The purpose of a surge tank is

A. To control the pressure variations due to rapid changes in the pipe line flow

B. To eliminate water hammer possibilities

C. To regulate flow of water to turbines by providing necessary retarding head of water

D. All of the above

What is the correct answer?

4

The value of bulk modulus of a fluid is required to determine

A. Reynold's number

B. Froude's number

C. Mach number

D. Euler's number

What is the correct answer?

4

Piezometer is used to measure

A. Pressure in pipe, channels etc.

B. Atmospheric pressure

C. Very low pressures

D. Difference of pressure between two points

What is the correct answer?

4

The units of kinematic viscosity are

A. Metres² per sec

B. kg sec/metre

C. Newton-sec per metre

D. Newton-sec per metre

What is the correct answer?

4

Specific weight of water in S.I. units is equal to

A. 1000 N/m3

B. 10000 N/m3

C. 9.81 × 103 N/m3

D. 9.81 × 10⁶ N/m3

What is the correct answer?

4

The time oscillation of a floating body with increase in meatcentric height will be

A. Same

B. Higher

C. Lower

D. Lower/higher depending on weight of body

What is the correct answer?

4

The capillary rise at 20°C in a clean glass tube of 1 mm bore containing water is approximately

A. 5 mm

B. 10 mm

C. 20 mm

D. 30 mm

What is the correct answer?

4

The power absorbed (in watts) in overcoming the viscous resistance of a footstep bearing is

A. μ π³ N² R² /1800 t

B. μ π³ N² R⁴ /1800 t

C. μ π³ N² R² /3600 t

D. μ π³ N² R⁴ /3600 t

What is the correct answer?

4

The bulk modulus of elasticity with increase in pressure

A. Increases

B. Decreases

C. Remain constant

D. Increases first up to certain limit and then decreases

What is the correct answer?

4

The most economical section of a rectangular channel is one which has hydraulic mean depth or hydraulic radius equal to

A. Half the depth

B. Half the breadth

C. Twice the depth

D. Twice the breadth

What is the correct answer?

4

The vapour pressure over the concave surface is

A. Less man the vapour pressure over the plane surface

B. Equal to the vapour pressure over the plane surface

C. Greater than the vapour pressure over the plane surface

D. Zero

What is the correct answer?

4

The pressure measured with the help of a pressure gauge is called

A. Atmospheric pressure

B. Gauge pressure

C. Absolute pressure

D. Mean pressure

What is the correct answer?

4

The surface tension of mercury at normal temperature compared to that of water is

A. More

B. Less

C. Same

D. More or less depending on size of glass tube

What is the correct answer?

4

Which of the following is an example of laminar flow?

A. Underground flow

B. Flow past tiny bodies

C. Flow of oil in measuring instruments

D. All of these

What is the correct answer?

4

Which of the following instrument can be used for measuring speed of a submarine moving in deep sea?

A. Venturimeter

B. Orifice plate

C. Hot wire anemometer

D. Pitot tube

What is the correct answer?

4

The process of diffusion of one liquid into the other through a semi permeable membrane is called

A. Viscosity

B. Osmosis

C. Surface tension

D. Cohesion

What is the correct answer?

4

The Reynold's number of a ship is __________ to its velocity and length.

A. Directly proportional

B. Inversely proportional

C. Square root of velocity

D. None of these