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Identify the correct statement.

A. Sphlerite is zinc oxide

B. The first law of the thermodynamics is stated as δE = δQ - δW

C. Lead can be produced in a blast furnace

D. T. ferrooxidans is a fungus that can be used for leaching chalcopyrite

Correct Answer :

C. Lead can be produced in a blast furnace


Related Questions

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The order of a chemical reaction

A. Can be determined only experimentally

B. Can be determined from the stoichiometry of the reaction

C. Cannot be zero

D. Can be fractional

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Which of the following forces does not act on a fluid at rest?

A. Viscous force

B. Gravity force

C. Hydrostatic force

D. Surface tension force

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4

The process of removal of scale formed during hot rolling of steel is termed as

A. Descaling

B. Shot blasting

C. Pickling

D. Skimming

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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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4

Pick out the correct statement.

A. Materials exhibiting high elasticity obey Hooke's law

B. The elastic behaviour of rubber under compression is the same as its behaviour under tension

C. The damping capacity of a material is due to its plastic deformation

D. The stress required to cause plastic flow in polycrystalline material is higher as compared to monocrystalline materials due to the presence of grains of different orientations

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Austempering process results in the formation of __________ structure.

A. Martensitic

B. Bainitic

C. Carburised

D. Stressed

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4

Catalyst used in the catalytic converter employed in automobiles to convert CO into CO2 and for complete oxidation of un-burnt hydrocarbons is

A. Nickel

B. Cobalt

C. Vanadium

D. Platinum

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4

Even though heat transfer co-efficient in boiling liquids is large, use of fins is advantageous, when the entire surface is exposed to __________ boiling.

A. Film

B. Nucleate

C. Transition

D. All modes of

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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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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

For separating small pieces of metal from engine oil of a car, the best separating technique is the

A. Chromatography

B. Evaporation

C. Filtration

D. Fractional distillation

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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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__________ is a special constituent of chlorophyll without which photosynthesis is not possible.

A. Calcium

B. Nitrogen

C. Phosphorous

D. Hydrogen

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Out of the following, which will fracture most readity, when hit with a hard hammer?

A. Brass

B. Bronze

C. German silver

D. Cast iron

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The 'laughing gas' is

A. Nitrous oxide

B. Nitric oxide

C. Nitrogen trioxide

D. Nitrogen pentoxide

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Induced draft fans provided in large thermal power plant boilers have __________ blades.

A. Forward curved

B. Backward curved

C. Double curved

D. Radial or straight

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All the atoms of the world comprise of electrons, proton & neutron except that of __________ atom in which neutron is absent.

A. Deuterium

B. Hydrogen

C. Neon

D. Helium

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Which of the following metals is not subjected to electrolytic refining/purification?

A. Copper

B. Zinc

C. Tin

D. Aluminium

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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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Which of the following phenomenon/ phenomena is/are diffusion controlled?

A. Dislocation climb

B. Cross-slip

C. Twinning

D. Recrystallisation

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Tin based white metals are used, where bearings are subjected to

A. High pressure & load

B. Low pressure & load

C. High temperature

D. Large surface wear

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Age hardening is connected with

A. Babbitt metal

B. Gun metal

C. Stainless steel

D. Duralumin

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Which of the following approaches the ideal gas behaviour most closely?

A. Wet steam

B. Saturated steam

C. Superheated steam

D. Saturated water

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4

__________ wire is never used for making the heating element.

A. Nichrome

B. Kanthal

C. Invar

D. None of these

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A spring material should have low

A. Elastic limit

B. Deflection value

C. Fatigue resistance

D. None of these

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What is the pH of distilled water?

A. 0

B. 1

C. 7

D. 14

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Limestone is added in the blast furnace (during pig iron manufacture) to

A. Form slag by combining with impurities

B. Supply heat by undergoing exothermic reaction with impurities

C. Reduce the coke consumption

D. Reduce slag viscosity

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The rolling process cannot be used to produce

A. Plates

B. Rods

C. Tubes

D. Wires

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Corrosion of metals cannot be prevented by its

A. Tempering

B. Chromising

C. Aluminising

D. Alloying

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The substance used as a smoke screen in warfare is

A. C2H2

B. SiCl4

C. P2O5

D. PCl5