Stoichiometry MCQs

Option A: Temperature vs. log (vapor pressure)

Option B: Vapor pressure vs. log (temperature)

Option C: Log (temperature) vs. log (vapor pressure)

Option D: Vapor pressure vs. temperature

Correct Answer: Temperature vs. log (vapor pressure) ✔

Option A: Specific heat

Option B: Vapour pressure

Option C: Viscosity

Option D: None of these

Correct Answer: None of these ✔

Option A: 4480

Option B: 2240

Option C: 1120

Option D: 0.4

Correct Answer: 4480 ✔

Option A: 770

Option B: 570

Option C: 270

Option D: 70

Correct Answer: 270 ✔

Option A: Resistance to abrasion

Option B: Resistance to slag penetration

Option C: Stability of volume at high temperature

Option D: Resistance to corrosion by slag

Correct Answer: Resistance to abrasion ✔

Option A: Superduty fireclay

Option B: Silica

Option C: Chromite

Option D: None of these

Correct Answer: Silica ✔

Option A: Fireclay

Option B: Silica

Option C: Chrome magnesite

Option D: Zirconia

Correct Answer: Fireclay ✔

Option A: Not required to resist the corrosive action of basic slag

Option B: Not subjected to fluctuation in temperature

Option C: Used for raising & maintaining high temperature

Option D: Both B. and C.

Correct Answer: D. Both B. and C. ✔

Option A: Cork

Option B: Saw dust

Option C: Sand

Option D: Chemically prepared foam

Correct Answer: Sand ✔

Option A: Oxidising atmosphere

Option B: Reducing atmosphere

Option C: Electric furnace

Option D: Neutral atmosphere

Correct Answer: Electric furnace ✔

Option A: Increases

Option B: Decreases

Option C: Remain same

Option D: May increase or decrease

Correct Answer: Increases ✔

Option A: Density

Option B: Specific heat

Option C: Thermal conductivity

Option D: None of these

Correct Answer: Thermal conductivity ✔

Option A: Reduced by the addition of acid oxides

Option B: Increased by the addition of acid oxides

Option C: Not affected by the addition of acid oxides

Option D: Always less than 1000°C

Correct Answer: Reduced by the addition of acid oxides ✔

Option A: Coke ovens regenerator

Option B: Outer lining of L.D. converter

Option C: Hearth bottom of blast furnace

Option D: Coke oven walls

Correct Answer: Coke ovens regenerator ✔

Option A: Poor resistance to the penetration of molten slag, metal & flue gases

Option B: Poor heat conductivity & low strength

Option C: Better thermal spalling resistance

Option D: All A., B. and C.

Correct Answer: D. All A., B. and C. ✔

Option A: Beehive coke oven

Option B: By-product coke oven walls

Option C: Combustion chamber of B.F. stoves

Option D: Coke oven regenerators

Correct Answer: By-product coke oven walls ✔

Option A: Silica

Option B: Carborundum

Option C: Fireclay

Option D: Magnesite

Correct Answer: Fireclay ✔

Option A: Increases

Option B: Lowers

Option C: Does not affect

Option D: Either A. or B.; depends on its quantity

Correct Answer: Lowers ✔

Option A: 3Al2O3.2SiO2

Option B: Al2O3

Option C: ZrSO4

Option D: ThO2

Correct Answer: 3Al2O3.2SiO2 ✔

Option A: Fusion point

Option B: Spalling resistance

Option C: Slag penetration resistance

Option D: Refractoriness under load (RUL)

Correct Answer: Spalling resistance ✔

Option A: 30

Option B: 50

Option C: 70

Option D: 90

Correct Answer: 90 ✔

Option A: 5

Option B: 20

Option C: 40

Option D: 55

Correct Answer: 20 ✔

Option A: Cost

Option B: Electrical conductivity

Option C: Thermal conductivity

Option D: Fusion point

Correct Answer: Cost ✔

Option A: Higher firing temperature

Option B: Higher moulding pressure

Option C: Finer grog size

Option D: All A., B. and C.

Correct Answer: D. All A., B. and C. ✔

Option A: Thermal spalling

Option B: Slag attack

Option C: Fusion under load

Option D: CO attack

Correct Answer: Thermal spalling ✔

Option A: Crushing strength

Option B: Resistance to slag attack

Option C: Both A. and B.

Option D: Neither A. nor B.

Correct Answer: Resistance to slag attack ✔

Option A: Atomic heat capacities of the crystalline solid elements are nearly constant and equal to 6.2 kcal/kg-atom according to the law of Petit and Dulong

Option B: Atomic heat capacities of all solid elements decrease greatly with decrease in temperature, approaching a value of zero at absolute zero temperature, when in the crystalline state

Option C: Generally, the heat capacities of compounds are lower in the liquid than in the solid state

Option D: The heat capacity of a heterogeneous mixture is an additive property, but when solutions are formed, this additive property may no longer exist

Correct Answer: Generally, the heat capacities of compounds are lower in the liquid than in the solid state ✔

Option A: 1 BTU =453.6 calories

Option B: 1 BTU = 252 calories

Option C: 1 calorie = 252 BTU

Option D: 1 calorie = 453.6 BTU

Correct Answer: 1 BTU = 252 calories ✔

Option A: Insulating refractories used in place of regular refractory bricks are usually called light weight refractories, and they have similar composition as heavy bricks

Option B: Graphite refractories are also called plumbago refractories

Option C: Superduty fireclay bricks correspond to a pyrometric cone equivalent of 26-28

Option D: Calcined magnesite is also called dead burnt magnesite

Correct Answer: Superduty fireclay bricks correspond to a pyrometric cone equivalent of 26-28 ✔

Option A: Refractories used in muffle furnace should have low thermal conductivity

Option B: The electrical resistivity of refractories drops rapidly with rise in temperature

Option C: For reducing spalling tendency, the refractory should be well fired and its porosity should be more

Option D: Refractoriness under load (RUL) of a refractory is always less than its refractoriness

Correct Answer: Refractories used in muffle furnace should have low thermal conductivity ✔

Option A: 6.023 × 1013

Option B: 6.023 × 1010

Option C: 6.023 × 107

Option D: 1013

Correct Answer: 6.023 × 107 ✔

Option A: 27

Option B: 54

Option C: 5.4

Option D: 2.7

Correct Answer: 54 ✔

Option A: Quantity adsorbed per unit mass is higher

Option B: Rate of adsorption is controlled by the resistance to surface reaction

Option C: Activation energy is very high

Option D: Heat of adsorption is very large

Correct Answer: Quantity adsorbed per unit mass is higher ✔

Option A: 1

Option B: 10

Option C: 100

Option D: 1000

Correct Answer: 1 ✔

Option A: A2 is more alkaline than solution A2

Option B: A1 is highly acidic

Option C: A1 is very slightly acidic

Option D: Both A. & C.

Correct Answer: D. Both A. & C. ✔

Option A: Decreasing its temperature

Option B: Increasing the volume of the vessel containing the solution

Option C: Diluting the solution

Option D: None of these

Correct Answer: None of these ✔

Option A: Recycling in a process stream helps in utilising the valuable reactants to the maximum with

Option B: The ratio of the quantity of a reactant present in the reactor feed of a recycling operation to the

Option C: Recycling in a process does not help in getting higher extent of reaction

Option D: Recycling is exemplified by refluxing back a part of the distillate to the distillation column to

Correct Answer: Recycling in a process does not help in getting higher extent of reaction ✔

Option A: Vapor pressure at dry bulb temperature

Option B: Total pressure

Option C: Both A. and B.

Option D: Neither A. nor B.

Correct Answer: C. Both A. and B. ✔

Option A: Charle’s law

Option B: Dalton’s law of partial pressures

Option C: Avogadro’s hypothesis

Option D: Boyle’s law

Correct Answer: B. Dalton’s law of partial pressures ✔

Option A: 2

Option B: 1

Option C: 3

Option D: unpredictable

Correct Answer: 3 ✔

Option A: Increases

Option B: Decreases

Option C: Remains unchanged

Option D: Approach zero at 0°C

Correct Answer: Decreases ✔

Option A: kcal/kg-mole.°C

Option B: Btu/lb-mole.°R

Option C: kcal/kg-mole.°K

Option D: Both B. & C.

Correct Answer: D. Both B. & C. ✔

Option A: 6.023 × 1023 molecules/kg.mole

Option B: 6.023 × 1023 molecules/gm.mole

Option C: 6.023 × 1016 molecules/kg.mole

Option D: 6.023 × 1026 molecules/gm.mole

Correct Answer: 6.023 × 1023 molecules/gm.mole ✔

Option A: 1.5

Option B: 15

Option C: 150

Option D: 1500

Correct Answer: 15 ✔

Option A: Condense

Option B: Form wet steam

Option C: Both A. & B.

Option D: Neither A. nor B.

Correct Answer: C. Both A. & B. ✔

Option A: Kinetic energy

Option B: Intermolecular forces of attraction

Option C: Potential energy

Option D: Total energy

Correct Answer: Kinetic energy ✔

Option A: Increases

Option B: Decreases

Option C: Remains unchanged

Option D: Increases exponentially

Correct Answer: Decreases ✔

Option A: 10-2

Option B: 10-4

Option C: 10-6

Option D: 10-8

Correct Answer: 10-4 ✔

Option A: Molal heat capacities of gases

Option B: Heat capacities of solids

Option C: Activation energy

Option D: Heat capacities of gases

Correct Answer: Heat capacities of solids ✔

Option A: W/m2°C

Option B: J/kg°K

Option C: W/m°K

Option D: J/m3°K

Correct Answer: J/kg°K ✔

Option A: Inversely

Option B: Exponentially

Option C: Linearly

Option D: Negligibly

Correct Answer: Linearly ✔

Option A: Vapors

Option B: Gases

Option C: Both A. & B.

Option D: Neither A. nor B.

Correct Answer: Gases ✔

Option A: 1

Option B: 2

Option C: 3

Option D: 4

Correct Answer: 3 ✔

Option A: Kistyakowsky equation

Option B: Antoine equation

Option C: Kopp’s rule

Option D: Trouton’s rule

Correct Answer: Antoine equation ✔

Option A: 283

Option B: 566

Option C: 293

Option D: 141.5

Correct Answer: 293 ✔

Option A: 1

Option B: 2.42

Option C: 1.987

Option D: 4.97

Correct Answer: 1 ✔

Option A: Heat of vaporisation

Option B: Melting point

Option C: Heat of fusion

Option D: Both B. and C.

Correct Answer: D. Both B. and C. ✔

Option A: 0

Option B: 1

Option C: 10

Option D: 100

Correct Answer: 0 ✔

Option A: 1 kcal/hr= 1.163 Watt

Option B: 1 Watt = 1.163 kcal/hr

Option C: 1 BTU/ft2.hr = 2.712 kcal/m2.hr

Option D: 1 kcal/m2.hr = 0.3687 BTU/ft2.hr = 1.163 Watt/m2

Correct Answer: 1 Watt = 1.163 kcal/hr ✔

Option A: Mixing

Option B: Wetting

Option C: Adsorption

Option D: None of these

Correct Answer: Adsorption ✔

Option A: Molarity

Option B: Normality

Option C: Molality

Option D: None of these

Correct Answer: Molality ✔

Option A: 0

Option B: 1

Option C: 2

Option D: 3

Correct Answer: 0 ✔

Option A: 1

Option B: 6

Option C: 3

Option D: 4

Correct Answer: 4 ✔

Option A: Vapor follows ideal gas law

Option B: Volume in the liquid state is negligible

Option C: Both A. & B.

Option D: Neither A. nor B.

Correct Answer: C. Both A. & B. ✔

Option A: Saturated

Option B: Supersaturated

Option C: Superheated

Option D: None of these

Correct Answer: Superheated ✔

Option A: Chrome or magnesite

Option B: Silicon carbide

Option C: Silica

Option D: Low duty fireclay

Correct Answer: Chrome or magnesite ✔

Option A: Coke ovens

Option B: Insulation

Option C: Regenerators

Option D: Muffle furnaces

Correct Answer: Insulation ✔

Option A: Green strength

Option B: Voids

Option C: Shrinkage

Option D: Both B. and C.

Correct Answer: D. Both B. and C. ✔

Option A: Silicon carbide

Option B: Silicon nitride

Option C: Crystalline magnesia

Option D: Zirconium sulphate

Correct Answer: Silicon carbide ✔

Option A: Refractoriness

Option B: Melting point

Option C: Rate at which a fluid will pass through the pores

Option D: Expansion during heating

Correct Answer: Rate at which a fluid will pass through the pores ✔

Option A: Blast furnace

Option B: Hot blast stove

Option C: Cupola

Option D: Wall of coke oven

Correct Answer: Wall of coke oven ✔

Option A: Quartz

Option B: Cristobalite

Option C: Tridymite

Option D: All have the same specific gravity

Correct Answer: Quartz ✔

Option A: Increases with decrease in porosity

Option B: Decreases with decreases in porosity

Option C: Is independent of its porosity and is maximum for insulating bricks

Option D: Increases with the amount of air entrapped in pores

Correct Answer: Increases with decrease in porosity ✔

Option A: Electric furnace walls

Option B: Steel melting furnace

Option C: Open hearth furnace

Option D: Burning zone of cement kilns

Correct Answer: Steel melting furnace ✔

Option A: Silica

Option B: Fireclay

Option C: High alumina refractory

Option D: Carbon black

Correct Answer: Carbon black ✔

Option A: Graphite

Option B: Magnesite chrome

Option C: Silica

Option D: Magnesia

Correct Answer: Graphite ✔

Option A: Magnesite

Option B: Dolomite

Option C: Fireclay

Option D: Chrome magnesite

Correct Answer: Fireclay ✔

Option A: 700

Option B: 1000

Option C: 1600

Option D: 2000

Correct Answer: 1600 ✔

Option A: Cupola

Option B: Gas producer

Option C: Bottom of hot metal mixer

Option D: Roof of open hearth furnace

Correct Answer: Bottom of hot metal mixer ✔

Option A: Are not resistant to the action of basic slags

Option B: Combine with salts (e.g. chlorides sulphates etc.) & bases (e.g. lime, magnesia etc.) forming

Option C: Shrink during firing

Option D: All A., B. and C.

Correct Answer: D. All A., B. and C. ✔

Option A: Beehive coke ovens

Option B: By-product coke ovens

Option C: Dome of blast furnace stoves

Option D: Roof of open hearth furnace

Correct Answer: Beehive coke ovens ✔

Option A: High insulating properties

Option B: Low heat capacity

Option C: Low thermal conductivity

Option D: Greater strength

Correct Answer: Greater strength ✔

Option A: Fireclay

Option B: Silicon carbide

Option C: Corundum

Option D: Siliceous fireclay

Correct Answer: Silicon carbide ✔

Option A: Beryllia

Option B: Carborundum

Option C: Corundum

Option D: Thoria

Correct Answer: Beryllia ✔

Option A: Stable form of silica upto 870°C

Option B: Converted to Tridymite on firing between 870 to 1470°C

Option C: Transformed to Cristobalite on heating above 1470°C

Option D: All A., B. and C.

Correct Answer: D. All A., B. and C. ✔

Option A: Increases

Option B: Decreases

Option C: Remain same

Option D: May increase or decrease

Correct Answer: Increases ✔

Option A: 1520-1630

Option B: 1630-1670

Option C: > 1730

Option D: > 2000

Correct Answer: > 1730 ✔

Option A: Spalling resistance

Option B: Refractoriness

Option C: Refractoriness under load (RUL)

Option D: None of these

Correct Answer: Spalling resistance ✔