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Current Affairs January 2024

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4

Energy to be supplied to the radioactive nucleus for the emission of a neutron is __________ MeV.

A. 0.8

B. 7.8

C. 200

D. 10000

Correct Answer :

A. 0.8


Related Questions

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Between 230 and 370°C, blue brittleness is caused in mild steel because of the

A. Immobility of dislocation

B. Strain-ageing

C. Increase in Young's modulus

D. Strain hardening

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To counteract the bad effects of strain hardening on a cold formed part, it must be

A. Tempered

B. Normalised

C. Annealed

D. Hardened

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Which of the following is the largest quantum of pressure?

A. 1 kg/cm2

B. 1 bar

C. 1 atmosphere

D. 1 kilo Pascal

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4

Theoretical volume of oxygen required for complete combustion of 1Nm3 of acetylene, in oxyacetylene welding is __________ Nm3.

A. 0.5

B. 1

C. 1/3

D. 2.5

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4

Uniform ramming of sand in green sand moulding process leads to

A. Reduced chance of gas porosity

B. Greater dimensional stability of the casting

C. Uniform flow of molten metal into the mould cavity

D. Less sand expansion type of casting defect

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4

In a forced draft cooling tower, water is cooled from 95 to 80°F by exposure to air with a wet bulb temperature of 70°F. In this case, the

A. Range is 15°F

B. Approach is 10°F

C. Both (A) & (B)

D. Neither (A) nor (B)

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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

Mho's scale of hardness, which consists of 10 standard minerals is used for the measurement of __________ hardness.

A. Scratch

B. Indentation

C. Dynamic

D. Rebound

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Steel produced from phosphatic iron is __________ in nature.

A. Malleable

B. Ductile

C. Brittle

D. Tough

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Calorific value of __________ are almost same.

A. Lignite & anthracite coal

B. Lignite & coal gas

C. Petrol & diesel

D. Coal gas & natural gas

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For a small scale toy factory, the fixed cost per month is Rs. 5000/-. The variable cost per toy is Rs. 20 and sales price is Rs. 30 per toy. The break even production per month will be __________ toys.

A. 250

B. 500

C. 1000

D. 3000

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4

Factor of safety in machine design is defined as the ratio of ultimate stress to __________ stress.

A. Working

B. Bearing

C. Yield

D. None of these

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Globular form of cementite is formed during the __________ process.

A. Spheroidising

B. Hardening

C. Annealing

D. Normalising

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__________ are normally subjected to sub-zero treatment.

A. Highly stressed parts

B. Gauges or precision parts

C. Cold rolled sheets

D. Non machinable materials

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4

Tip of the match stick contains a mixture of

A. K + S

B. K + S + K2Cr2O7

C. S + K2Cr2O7 + White P

D. None of these

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4

Powder metallurgy is used to produce

A. High precision components with complex cavities and sharp features

B. Components of large size

C. Porosity free components

D. Components of such alloys whose constituents do not form alloys readily

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4

For which pair of the fuel gases, calorific value (C.V.) of one fuel is almost double that of the other on volume basis (i.e., kcal/Nm3) while the C.V. is same on weight basis (i.e., kcal/kg)?

A. Propane and acetylene

B. Propane and LPG

C. Sewage gas and gobar gas

D. B.F gas and coke oven gas

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4

An abrupt and sudden fall in the reading of barometer is an indication of the

A. Storm

B. Rain

C. Clear weather

D. Cold wave

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Superheating of steam is done at constant

A. Enthalpy

B. Entropy

C. Pressure

D. Volume

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Alloying elements present in Haynes stellite, which has superior performance than high speed steel, are:

A. Nickel, cobalt & chromium

B. Tungsten, chromium & cobalt

C. Manganese, chromium & cobalt

D. Tungsten, molybdenum & nickel

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4

Which of the, following is not associated with the functioning of a petrol engine?

A. Compression ignition system

B. Spark plug

C. Carburettor

D. Otto cycle

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4

Which of the following is used to produce draught in the locomotive boilers?

A. Chimney

B. Induced draught fan

C. Forced draught fan

D. Steam jet arrangement

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4

__________ is not used as a material of construction in thermocouples.

A. Alumel

B. Rhodium

C. Constantan

D. Duralumin

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4

What is the value of entropy at 273°K?

A. 0

B. 1

C.

D. None of these

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The fugacity of liquid water at 298 K is approximately 3171 Pa. Considering the ideal heat of vaporisation as 43723 J/gm.mole, its fugacity at 300 K would be

A. 3171Pa

B. 3567Pa

C. 1.01 × 105Pa

D. 5000Pa

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4

What is the range of tempering temperature (°C) for most of the materials?

A. 75-100

B. 200-300

C. 350-450

D. 500-600

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4

Wrought iron does not have

A. Uniform strength in all directions

B. Ability to hold protective coating

C. High ductility & corrosion resistance

D. Easily weldable characteristics

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Silicon percentage in acid resistant cast iron is about

A. 4

B. 8

C. 14

D. 20

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Specific gravity of a metal, which weighs 5 kg in air and 4 kg when submerged in water, will be

A. 5

B. 1.25

C. 2.5

D. 3.75

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Yield strength of a material is determined by the __________ test.

A. Creep

B. Tension

C. Compression

D. Endurance