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A polymer is termed as an 'elastomer', if its percentage elongation is more than 100%. An elastomer is termed as 'rubber' if its percentage elongation is more than __________ percent.

A. 150

B. 200

C. 300

D. 400

Correct Answer :

B. 200


Related Questions

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As per international norms, the maximum permissible value of noise level in the industrial environment is __________ decibels as measured at a distance of 1.5 metres from the source of noise.

A. 110

B. 85

C. 60

D. 45

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The surface tension of a liquid, at critical temperature is

A. Indeterminate

B. Zero

C. Infinity

D. Same as that at any other temperature

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Which of the following contributes maximum as main source of sulphur in the blast furnace charge?

A. Sinter

B. Coke

C. Iron ore

D. Limestone

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Wavelength of radiation emitted by a body depends on the __________ of its surface.

A. Temperature

B. Area

C. Nature

D. All 'a', 'b' & 'c'

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The best lubricants for a machine working at high temperature & load is

A. Grease

B. Solid lubricant

C. Animal oils

D. Mineral oils

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Cast iron contains __________ percent carbon.

A. 2.5

B. 3.75

C. 4.75

D. 5.25

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Joule-Thomson co-efficient is the ratio of

A. Pressure change to temperature change occuring during adiabatic compression of a gas

B. Pressure change to temperature change occuring during adiabatic throttling of a gas

C. Temperature change to pressure change occuring during adiabatic compression of a gas

D. Temperature change to pressure change occuring during adiabatic throttling of a gas

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Larger length & diameter water pipes are made by

A. Electrical resistance welding

B. Die casting

C. Semi-centrifugal casting

D. Continuous casting

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The atmospheric temperature during melting of ice/snow (in the atmosphere)

A. Decreases

B. Increases

C. Remain same

D. May increase or decrease; depends on the altitude where snow melts

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__________ 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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Addition of small amount of __________ to grey cast iron is done to produce nodular grey cast iron.

A. Manganese

B. Phosphorous

C. Magnesium

D. Chromium

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As the fluid flow rate increases, the float of the Rotameter

A. Rises in the tube

B. Rotates at higher speed

C. Rotates at lower speed

D. Drops down in the tube

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In the formation of cermets, the ratio of ceramic material to metallic material is usually 80:20. Which of the following is a cermet?

A. Zirconia

B. Alumina

C. Bakelite

D. Tungsten carbide

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Speed of a submarine in deep sea & that of an aeroplane is measured by a/an

A. Pitot tube

B. Hot wire anemometer

C. Rotameter

D. Stroboscope

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Electrochemical corrosion can occur, only if __________ is present in contact with metal.

A. Air

B. Oxygen

C. Liquid medium

D. Gaseous medium

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In a drilling process, the metal is removed by both shearing & extrusion. General purpose drills are made of

A. Stainless steel

B. Mild steel

C. High speed steel

D. High carbon steel

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A semi-conductor is damaged & behaves like a conductor, on passing a strong electric current through it, because it heats up the crystals & breaks the covalent bonds resulting in __________ electrons.

A. Lack of free

B. Excess of

C. Decrease in

D. None of these

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With increase in compression ratio, the volumetric efficiency of air compressor

A. Increases

B. Decreases

C. Remain same

D. May increase or decrease (depends on the suction pressure)

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Hot extrusion process is not used for making

A. Cast iron pipe for domestic water supply

B. Aluminium curtain rods

C. Stainless steel tubes used in furnitures

D. Any of these

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The most commonly used moderator in nuclear power plants is

A. Graphite

B. Light water

C. Heavy water

D. Beryllium

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Which of the following is a commonly used manometric liquid for low pressure range?

A. Ethyl alcohol

B. Carbon tetrachloride

C. Glycerol

D. Ethylene glycol

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The laminar boundary layer thickness in zero pressure gradient flow over a flat plate along the x-direction varies as x0.5 while the thickness of turbulent boundary layer varies as (where, x = distance from the leading edge)

A. x1.5

B. x0.8

C. x-1.5

D. x-0.8

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Electrostatic separation of minerals from each other is based on their differences in the following property.

A. Densities

B. Magnetic permeabilities

C. Electrical conductivities

D. Hardness

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In the diving apparatus, helium is used along with oxygen, because it is

A. Easily available

B. Not soluble in blood at high pressure

C. Lighter than nitrogen

D. Completely miscible with oxygen

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4

Air-petrol ratio in an automotive petrol engine is around

A. 14 : 1

B. 22 : 1

C. 25 : 1

D. 4 : 1

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In condensers used in thermal power plants, steam is normally used in shell side and cooling water on the tube side, because of the reason that

A. Compared to the mass flow rate of cooling water, the rate of condensation of steam is invariably smaller

B. Maintaining vacuum on tube side is more difficult than that on the shell side

C. Water velocity can be increased conveniently to increase the overall heat transfer co-efficient because of its lower specific volume compared to steam

D. Condenser can act as a storage unit for condensed steam

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Which of the following represents the correct time-temperature curve when a block of metal is heated above room temperature & then left to cool in the room following Newton's law of cooling in which the rate of temperature drop will go on decreasing with the passage of time.

A.

B.

C.

D.

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Cemented carbide tools are not suitable for cutting

A. Aluminium

B. Brass

C. Cast iron

D. Steel

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Bad odour in sanitary latrines is reduced by periodically sprinkling

A. Bleaching powder

B. Lime powder

C. Aluminium sulphate

D. None of these

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Difference at any instant between the value of the controlled variable and the set point is called the

A. Deviation

B. Derivative time

C. Error ratio

D. Differential gap