Home
Current Affairs January 2024

What is the correct answer?

4

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 : √5

Correct Answer :

A. 1 : 5


Related Questions

What is the correct answer?

4

The discharge through a channel of rectangular section will be maximum, if

A. Its depth is twice the breadth

B. Its breadth is twice the depth

C. Its depth is thrice the breadth

D. Its breadth is thrice the depth

What is the correct answer?

4

The Newton's law of resistance is based on the assumption that the

A. Planes of the body are completely smooth

B. Space around the body is completely filled with the fluid

C. Fluid particles do not exert any influence on one another

D. All of the above

What is the correct answer?

4

The specific weight of water is 1000 kg/m3

A. At normal pressure of 760 mm

B. At 4°C temperature

C. At mean sea level

D. All the above

What is the correct answer?

4

A vessel of 4 m3 contains oil which weighs 30 kN. The specific weight of the oil is

A. 4.5 kN/m3

B. 6 kN/m3

C. 7.5 kN/m3

D. 10 kN/m3

What is the correct answer?

4

The most efficient section of a channel is

A. Triangular

B. Rectangular

C. Square

D. Trapezoidal

What is the correct answer?

4

A nozzle is generally made of

A. Cylindrical shape

B. Convergent shape

C. Divergent shape

D. Convergent-divergent shape

What is the correct answer?

4

A piece of metal of specific gravity 13.6 is placed in mercury of specific gravity 13.6, what fraction of it volume is under mercury?

A. The metal piece will simply float over the mercury

B. The metal piece will be immersed in mercury by half

C. Whole of the metal piece will be immersed with its top surface just at mercury level

D. Metal piece will sink to the bottom

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

One cubic metre of water weighs

A. 100 litres

B. 250 litres

C. 500 litres

D. 1000 litres

What is the correct answer?

4

A Piezometer tube is used only for measuring

A. Low pressure

B. High pressure

C. Moderate pressure

D. Vacuum pressure

What is the correct answer?

4

Euler's equation in the differential form for the motion of liquids is given by

A. dp/ρ + g.dz + v.dv = 0

B. dp/ρ - g.dz + v.dv = 0

C. ρ.dp + g.dz + v.dv = 0

D. ρ.dp - g.dz + v.dv = 0

What is the correct answer?

4

In a free vortex motion, the radial component of velocity everywhere is

A. Maximum

B. Minimum

C. Zero

D. Nonzero and finite

What is the correct answer?

4

Choose the wrong statement

A. Viscosity of a fluid is that property which determines the amount of its resistance to a shearing force

B. Viscosity is due primarily to interaction between fluid molecules

C. Viscosity of liquids decreases with increase in temperature

D. Viscosity of liquids is appreciably affected by change in pressure

What is the correct answer?

4

A venturi-flume is used to measure

A. Pressure of liquid

B. Discharge of liquid

C. Pressure difference between two points in a channel

D. Pressure difference between two points in a pipe

What is the correct answer?

4

The force present in a moving liquid is

A. Inertia force

B. Viscous force

C. Gravity force

D. All of these

What is the correct answer?

4

The total pressure on the surface of a vertical sluice gate 2 m x 1 m with its top 2 m surface being 0.5 m below the water level will be

A. 500 kg

B. 1000 kg

C. 1500 kg

D. 2000 kg

What is the correct answer?

4

When the Mach number is less than unity, the flow is called

A. Sub-sonic flow

B. Sonic flow

C. Super-sonic flow

D. Hyper-sonic flow

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 coefficient of venturi-flume, generally, lies between

A. 0.3 to 0.45

B. 0.50 to 0.75

C. 0.75 to 0.95

D. 0.95 to 1.0

What is the correct answer?

4

A flow is called sub-sonic, if the Mach number is

A. Less than unity

B. Unity

C. Between 1 and 6

D. More than 6

What is the correct answer?

4

In order that flow takes place between two points in a pipeline, the differential pressure between these points must be more than

A. Frictional force

B. Viscosity

C. Surface friction

D. All of the above

What is the correct answer?

4

According to Darcy's formula, the loss of head due to friction in the pipe is (where f = Darcy's coefficient, l = Length of pipe, v = Velocity of liquid in pipe, and d = Diameter of pipe)

A. flv²/2gd

B. flv²/gd

C. 3flv²/2gd

D. 4flv²/2gd

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

The pressure of a liquid measured with the help of a Piezometer tube is

A. Vacuum pressure

B. Gauge pressure

C. Absolute pressure

D. Atmospheric pressure

What is the correct answer?

4

Newton's law of viscosity is a relationship between

A. Shear stress and the rate of angular distortion

B. Shear stress and viscosity

C. Shear stress, velocity and viscosity

D. Pressure, velocity and viscosity

What is the correct answer?

4

A tank of uniform cross-sectional area (A) containing liquid upto height (H1) has an orifice of cross-sectional area (a) at its bottom. The time required to bring the liquid level from H1 to H2 will be

A. 2A × √H₁/Cd × a × √(2g)

B. 2A × √H₂/Cd × a × √(2g)

C. 2A × (√H₁ - √H₂)/Cd × a × √(2g)

D. 2A × (√H3/2 - √H3/2)/Cd × a × √(2g)

What is the correct answer?

4

The center of gravity of the volume of the liquid displaced by an immersed body is called

A. Metacentre

B. Center of pressure

C. Center of buoyancy

D. Center of gravity

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 length AB of a pipe ABC in which the liquid is flowing has diameter (d1) and is suddenly enlarged to diameter (d2) at B which is constant for the length BC. The loss of head due to sudden enlargement is

A. (v₁ - v₂)²/g

B. (v₁² - v₂²)/g

C. (v₁ - v₂)²/2g

D. (v₁² - v₂²)/2g

What is the correct answer?

4

A structure, whose width is __________ the width of the channel, is called a flumed structure.

A. Less than

B. More than

C. Equal

D. None of these