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4

Unit of surface tension in S.I. unit is

A. Watt/m

B. Joule/

C. Newton/

D. Joule/m

Correct Answer :

B. Joule/


Related Questions

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4

__________ circuit is most commonly used to measure strain with the help of a strain gauge.

A. Ballast

B. Voltage balancing potentiometric

C. Simple current sensitive

D. None of these

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4

The concentration of (H+) ions is 4 x 10-5 in a solution. Then pH of the solution will be (Given log 4 = 0.6)

A. 4.4

B. 5.6

C. 8.4

D. 2.4

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4

In a totally irreversible isothermal expansion process for an ideal gas, ΔE = 0, ΔH = 0. Then ΔQ and ΔS will be

A. ΔQ = 0, ΔS=0

B. ΔQ = 0, ΔS = +ve

C. ΔQ = 0, ΔS = -ve

D. ΔQ = +ve, ΔS= +ve

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4

The product of a commercial direct reduction process is

A. Liquid iron

B. Solid iron

C. Sponge iron

D. Iron saturated with carbon

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4

Thermistors are used in __________ devices.

A. Voltage measuring

B. Temperature measuring

C. Temperature compensating

D. Both (B) & (C)

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4

Leakage in a cooking gas cylinder is detected by

A. Radio-isotopes

B. Pouring soap solution on the surface and locating the gas bubbles

C. Halide torch

D. Pungent smell of mercaptans present in the gas

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4

A highly elastic material is deformed least on loading and retains its original form on removal of the load. Which of the following is the most elastic material?

A. Steel

B. Glass

C. Rubber

D. Brass

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4

Electrical conductivities of semi-conductors are of the order of __________ ohm/cm.

A. 10-3

B. 103

C. 10-15

D. 1015

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4

A particle is settling in a liquid under Stokesian conditions. The free falling velocity of the particle is proportional to

A. √(Particle diameter)

B. Particle diameter

C. (Particle diameter)2

D. (Particle diameter)3

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4

Highest cutting speed is achieved by the __________ tool material.

A. High speed steel

B. Carbide

C. Cast alloy

D. Plain carbon steel

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4

Hardening of steel is not possible, unless it is heated __________ critical point.

A. Above the highest

B. Above the lowest

C. Between the first & second

D. Between the second & third

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4

Out of the following, the alloy which has equal percentage of constituents, is

A. White metal

B. Gun metal

C. Duralumin

D. Constantan

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4

Water hammer is caused in steam carrying pipelines, because of

A. Partial condensation of steam

B. Vibration of the pipeline

C. High degree of superheat of steam

D. Its exposure to torrential rain

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4

Dryness factor of steam is defined as the ratio of the mass of vapor in the mixture to the mass of the mixture. Dryness factor of steam is measured by a __________ calorimeter.

A. Bomb

B. Throttling

C. Junker's

D. Boy's

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4

The best guide to judge the general quality of water is the measurement of its

A. pH value

B. Electrical conductivity

C. Turbidity

D. Dissolved oxygen content

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4

Brazing filler metal used for joining steel plates

A. Melts below the melting points of base metals

B. Melts below 300°C

C. Is copper phosphorous alloy

D. Is copper

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4

Pick out the wrong statement.

A. Lead can creep under its own weight at room temperature

B. The electrical conductivity of gold is considerably reduced by alloying additions due to the decrease in electron movement

C. Recrystallisation temperature decreases with decrease in strain in a cold worked metal

D. With increase in temperature, the electrical conductivity of intrinsic semi-conductor will increase

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4

Flue gases pass through the following boiler accessories in a high pressure natural circulation boiler.
A. Induced draft fan
B. Economiser
C. Air preheater
D. Steam superheater Which of the following gives the correct sequence of flow of the flue gases through the above mentioned boiler accessories?

A. A, C, B, D

B. D, B, C, A

C. D, C, B, A

D. D, A, B, C

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4

Material of construction of the electrode used in the electric resistance welding is

A. Stainless steel

B. Graphite

C. Copper

D. Steel

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4

Shrinkage allowance on pattern is provided to compensate for shrinkage when the

A. Metal changes from liquid state to solid state at freezing temperature

B. Solid phase temperature drops from freezing temperature to the room temperature

C. Liquid metal temperature drops from pouring temperature to room temperature

D. Liquid metal temperature drops from pouring temperature to freezing temperature

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4

Silicon percentage in silicon steel used for electrical equipments is about

A. 1

B. 4.0

C. 8

D. 14

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4

Case hardening of a material is

A. Followed by tempering or carburising

B. Preceded by its tempering

C. Done to get a soft ductile interior with a very hard surface

D. Carried out to get extreme hardness in its core

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4

Cold chisels hammers are made of

A. High speed steel

B. High carbon steel

C. Forged steel

D. Mild steel

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4

Preheating before welding is done to

A. Make the plate softer

B. Burn oil & grease sticking to plate surfaces

C. Avoid plate distortion

D. Prevent cold cracks

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4

In a boundary layer developed along the flow, the pressure decreases in the downstream direction. The boundary layer thickness in this case will

A. Decrease gradually

B. Increase gradually

C. Increase rapidly

D. Remain constant

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4

Temper brittleness of a material can be fairly detected by the __________ test.

A. Fatigue

B. Notched bar impact

C. Tensile

D. Hardness

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4

Melting point & boiling points of liquid oxygen are respectively - 218.8°C & - 183°C, while the same for liquid nitrogen is - 210°C & - 195.8°C respectively. The difference in melting points of liquid oxygen & liquid nitrogen is not equal to 8.8

A. °C

B. °F

C. °K

D. °R

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4

For preparation of porous bearings by powder metallurgy, preferred particle shape is

A. Spherical

B. Nodular

C. Irregular

D. No preferred shape

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4

Out of the following, the most malleable material is

A. Copper

B. Aluminium

C. Wrought iron

D. Lead

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4

Which of the following emissions in the exhaust gas of an I.C. engine causes the formation of photochemical smog?

A. Nitrogen oxides

B. Hydrocarbons

C. Both 'a' & 'b'

D. Carbon monoxide