Pakistan's MCQ Practice Library for Competitive Exams

A. ?p/? = 4f (L/D) (V2/2gc)

C. cDp)

D. ?p/L = 150 [(1 ?)/?3]. (?.V0

E. 2cD)

F. ?p/L = 1.75 [(1 ?)/?3]. (?V0

A. Water with pH value less than 7, is acidic

B. Sodium sulphate or sodium carbonate do not cause hardness in water

C. Aeration of water is effective in CO2 removal

B. Surface tension

C. Refractive index

D. Specific heat

B. Chemical equilibrium is a static state

C. A photochemical reaction is catalysed by light

D. A chemical reaction occurs when the energy of the reacting molecule is less than the activation energy of the reaction

A. Random packing a packed tower offers the advantage of lower pressure drop and higher throughput of fluids as compared to regular/stacked packing

B. Draining of residual liquid on tray during shut down of distillation column is facilitated by weep holes

C. It is preferred to use a vertical condenser for condensation of vapor from a distillation column without sub-cooling

A. None of these

B. Throughout the converging portion of the tube, the density increases in the downstream

D. ection

E. The value of Mach number is always unity at the throat

A. Reynolds number of condensing liquid is based on its mass flow rate

C. Filmwise condensation gives a lower heat transfer rate than the dropwise condensation

D. ce on it

E. If a condensing liquid does not wet the surface dropwise, even then condensation will take

A. een, is called Work index

C. Energy required in kwh per ton of product, such that 80% of it passes through a 200 mesh

D. Plastic chips are called non-cohesive solids

E. Communition is a generic term for size enlargement operation

A. COD is related to BOD of a given waste in water but the relationship varies for different

B. hromate in cone, sulphuric acid solution at boiling temperature for specified time

C. tes. Typically COD of potable water may be 1-2 mg/litre

D. Chemical oxygen demand (COD) is a measure of chemically oxidisable organic matter present

E. water

F. COD is determined by oxidising the organic matter present in water with potassium

A. Dialysis process is used for the production of fresh water from brine

C. Electrodialysis is used for the refining/purification of petrol

D. Both B. and C.

B. The pressure drop through the packed towers is generally more than the pressure drop through plate towers designed for same duty

C. None of these

D. When highly corrosive fluids are to be handled, the plate towers prove to be cheaper and easier to construct than packed tower

A. Law of mass action was suggested by Le-Chatelier

B. A catalyst changes the equilibrium point

C. rgy

D. The difference between the energy of reactants and that of the products is the activation

A. Heat added to or given up by a substance at constant temperature is called the sensible heat

B. A mixture of vapor gas is called saturated, if the equilibrium vapor pressure of the liquid is

C. e than the partial pressure of the vapor at the same temperature

D. A substance existing above its critical temperature is called a saturated vapor

A. 1 calorie = 252 BTU

C. 1 BTU =453.6 calories

D. 1 calorie = 453.6 BTU

B. Specific gravity

C. Flashpoint

D. Viscosity

A. Edward A. Shills

B. G.A. Almond

C. Karl Marx

D. Max Weber

A. visual symbols

C. verbal symbols

D. spoken (not mental) verbal symbols

A. viscosity only

B. unit weight only

D. none of the above

A. All the above

B. Granulation

D. Tillage

B. In insecticides manufacture

C. For making nylon-6

D. In making PVC