Pakistan's MCQ Practice Library for Competitive Exams

A. There is no transfer lag for a single first order system

B. Transfer lag is a characteristic of all higher order systems (other than first order systems)

C. Stirred tank with a water jacket exemplifies an interacting system

A. Most of the enzyme catalysed reactions involve at least two substrates

B. Catalytic activity of enzyme catalysed reactions which is affected by temperature, pH value &

C. rmodynamic properties of substrates & products

D. mical agents, is maximum at a temperature of about 45C

F. Equilibrium concentrations in enzyme catalysed reactions can be calculated by using the

A. Metal/alloys having hexagonal crystal lattice structure are less malleable than those having

B. ic crystal lattice structure

C. Metal/alloys having body centred cubic (bcc) crystal lattice structure is stronger & less ductile

D. n those having face centred cubic (fcc) crystal lattice structure

F. Both ferritic & austenitic stainless steel has a face centred cubic (fcc) crystal structure

A. Pure rubber is as useless as pure gold as a material of construction

C. Copper has poor weldability

D. Reinforced plastics are made from both thermoplastic as well as thermosetting plastics

A. ghness & Reynolds number

C. Greater is the kinematic viscosity of the liquid, greater is the thickness of the boundary layer

D. Fanning friction factor in case of turbulent flow of liquids in pipe depends upon relative

E. Blowers develop a maximum pressure of 2 atmospheres

A. Graphite refractories are also called plumbago refractories

B. Calcined magnesite is also called dead burnt magnesite

D. Insulating refractories used in place of regular refractory bricks are usually called light weight

E. ractories, and they have similar composition as heavy bricks

A. A dust catcher is simply an enlargement in a pipeline which permits the solids to settle down

B. Wear and tear in wet crushing is more than that in dry crushing of materials

C. to reduction in velocity of the dust laden gas

E. Recycled coarse material to the grinder by a classifier is termed as circulating load

A. For reducing spalling tendency, the refractory should be well fired and its porosity should be more

B. Refractoriness under load (RUL) of a refractory is always less than its refractoriness

C. The electrical resistivity of refractories drops rapidly with rise in temperature

A. The evaporation of aqueous solution of glucose causes its molarity to increase

B. Both the freezing point as well as boiling point of sea water is more than that of distilled water

C. The solution containing equal masses of two liquids X and Y has the same mole fraction of

D. 216;X and Y

A. Heat capacity of a diatomic gas is higher than that of a monatomic gas

C. Total number of molecules contained in 22.4 litres of hydrogen at NTP is 6.023 x 1023

D. The binary mixture of a particular composition in both vapor and liquid state is known as an azeotropic mixture

B. The phosphorous nutrient makes the plant stem stronger and increases its branches

C. A straight fertiliser contains only one nutrient

D. Calcium cyanamide is used as weed killer in onion fields

A. Pure rubber is as useless as pure gold as a material of construction

C. Copper has poor weldability

D. Reinforced plastics are made from both thermoplastic as well as thermosetting plastics

B. Troutons ratio of non-polar liquids is calculated using Kistyakowsky equation

C. Thermal efficiency of a Carnot engine is always less than 1

D. None of these

B. Contacting cold vapor-gas mixture with hot liquid exemplifies humidification process

C. Diffusion co-efficient and mass transfer co-efficient are not same in any mass transfer

D. Contacting cold liquid with warm vapor-gas mixture exemplifies dehumidification process

E. ration

A. ponents</strong>

B. The solubility of a particular gas in ideal solution in any solvent is always the same

C. The operating line always lies above the equilibrium solubility curve in case of a single

D. ponent stripper

E. The operating line always lies below the equilibrium solubility curve in case of a single

B. None of these

C. t particles from flue gases at very high temperature</strong>

D. A slight haze at the top of chimney indicates good combustion in the furnace

E. micronic dust particles present in flue gas

F. Electrostatic precipitator is the most efficient dust collection equipment for removal of

A. ?-particle emission from a radioactive element makes it electrically negative

C. The disintegration constant of a radioactive isotope is independent of pressure, temperature or concentration

D. ?-particle emission from a radioactive element makes it electrically positive

A. Azoic dyes are mostly applied on cotton fabrics

C. Mordant dyes are applied mainly to wools

D. Basic dyes (e.g. amino derivatives) are applied mostly to paper

A. The viscosity of a liquid increases with decrease in temperature

B. The viscosity of gas increases with increase in temperature

C. The eddy viscosity is a function of the type of turbulence involved

A. Multigrade lubricating oils have high viscosity index

B. Naphthenic oil has very low viscosity index

C. Paraffinic oil has very high viscosity index