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Current Affairs January 2024

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4

The elastic strain energy of a unit length of an edge dislocation as compared to that of a screw dislocation is

A. More

B. Equal

C. Less

D. Double

Correct Answer :

A. More


Related Questions

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4

The refrigerant freon-12 is chemically

A. CCl2F2

B. CCl3F

C. CClF3

D. CCl4F

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4

Metal cutting by oxy-acetylene flame is accomplished by the __________ of the metal.

A. Burning

B. Intensive oxidation

C. Evaporation

D. None of these

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4

Laser welding is widely employed in the __________ industries.

A. Electronic

B. Structural

C. Process

D. Heavy

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4

Dephosphorization of molten pig iron is favoured by

A. Oxidising and basic slag

B. Reducing and basic slag

C. High activity co-efficient of phosphorous in metal

D. Oxidising and neutral slag

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4

The starting of a car takes time in winter, because the

A. Octane number of fuel is decreased

B. Fuel supply for ignition is not sufficient

C. Vaporisation of the fuel is decreased

D. Pour point of fuel decreases

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4

Pick out the wrong statement

A. Processing of thermosetting plastics is ideally done by injection moulding

B. Processing of thermoplastics is ideally done by compression moulding

C. Mass production of seamless pipes are done by electrical resistance welding (ERW)

D. Stretch forming is a process of cold drawing

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4

Which of the following relationships is correct for relating the three elastic constants of an isotropic elastic material (where, E = Young's modulus, G = Modulus of rigidity or shear modulus v = Poisson's ratio)?

A. E = 2G (1 + v)

B. E = G (1 + v)

C. E = G (1 + v)/2

D. E = 2G (1 + 2v)

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4

Boiler tube size is specified by its thickness and __________ diameter.

A. Outside

B. Inside

C. Mean

D. None of these

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4

Normalising does not __________ of a metal.

A. Improve machinability & tensile strength

B. Remove internal stresses

C. Refine the structure

D. Remove strains caused by cold working

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4

Plants produce carbohydrates from the CO2 present in the atmosphere by

A. Polymerisation

B. Photochemical reaction

C. Oxidation

D. None of these

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4

Half life of a radioactive isotope corresponds to the time required for half of the __________ to decay.

A. Atoms

B. Neutrons

C. Nucleons

D. Electrons

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4

Large scale fire on fuel gas line is normally extinguished by

A. Water

B. Steam

C. Foam

D. Nitrogen

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4

Steel produced from phosphatic iron is __________ in nature.

A. Malleable

B. Ductile

C. Brittle

D. Tough

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4

Neutrons are present in all atoms except that of

A. He

B. C

C. H

D. Ar

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4

The capacity of a spring to store energy is called the spring form co-efficient. Stiffness of a spring is measured by the

A. Ability to absorb shock

B. Capacity to store energy

C. Ratio of the wire & coil diameters

D. Load to produce unit deflection

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4

Limestone addition in the blast furnace is done to flux __________ present in the raw materials.

A. SiO2

B. Al2O3

C. MnO2

D. P

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4

Closeness of packing is maximum in case of __________ crystal lattice.

A. Face centred

B. Simple cubic

C. Body centred

D. None of these

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4

A gas which is collected over water becomes moistened due to water vapor, exerts its own partial pressure at the gas temperature, which is termed as its

A. Aqueous tension

B. Saturated humidity

C. Vapor pressure

D. Absolute humidity

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4

Screws are specified by their __________ diameters.

A. Minor

B. Major

C. Pitch

D. None of these

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4

Atomic __________ is a whole number for an element.

A. Number

B. Weight

C. Radius

D. None of these

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4

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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4

All of the following alloying elements of steel increases hardness but sacrifice ductility, except

A. Nickel

B. Vanadium

C. Molybdenum

D. Chromium

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4

Chlorine acts as a bleaching agent only in the presence of

A. Dry air

B. Pure oxygen

C. Moisture

D. Sunlight

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4

Heating of ferromagnetic materials to a temperature above Curie temperature makes it

A. Insulator for heat & electricity transmission

B. Ferritic

C. Behave like paramagnetic materials

D. Superconductor

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4

Super conduction in metals is observed at a temperature of __________ °K.

A. <100

B. >100

C. About 273

D. About 373

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4

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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4

Which of the following materials has the maximum shrinkage allowance?

A. Brass

B. Cast iron

C. Lead

D. Aluminium alloy

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4

Silicon crystal can be converted to p-type semiconductor by doping with

A. Phosphorous

B. Nitrogen

C. Carbon

D. Boron

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4

__________ is the process of coating the surface of steel with aluminium oxide, thereby imparting it increased resistance to corrosion & oxidation upto a temperature of 700°C.

A. Veneering

B. Galvanising

C. Electroplating

D. Calorising

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4

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