Pakistan's MCQ Practice Library for Competitive Exams

A. Rate of digestion of sludge is more at higher temperature

B. Mesophilic organisms digest the sludge if the temperature is between 25 and 40C

C. Thermophilic organisms digest the sludge if the temperature ranges from 40 to 60C

A. cornish is fire tube and lancashire is water tube

B. cornish is water tube and lancashire is fire tube

C. cornish has two fire tubes and lancashire has one

E. both have two fire tubes

A. free float > total float

B. free float = total float

D. independent float > free float

E. independent float = total float

A. none of the above

B. all of the above

D. gas turbine uses low air-fuel ratio to economise on fuel

E. gas turbine uses low air-fuel ratio to develop the high thrust required

A. For petrol and large gas engines, quantity governingds preferred

B. In quantity governing, air fuel ratio is almost constant and quantity of charge is changed depending on load

C. In hit and miss governing, fuel supply is completely cut off during one or more number of cycles

E. For close regulation of speed, combination of both quality and quantity governing is used

A. Psilophyton

C. Rhynia

D. Cooksonia

A. 1 lb/hr.ft2 = 4.8823 kg/hr.m2

C. 1 lb/hr.ft3.atm. = 4.8182 kg/hr.m2.bar

D. 1 kg/hr.m2.atm= 0.98687 kg/hr. m .bar

A. 1 kcal = 3.968 BTU = 0.00116 kWh = 0.00156 hp

B. 1 ton of TNT (tri-nitro-toluene) = 4.2 GJ (1G = 109)

C. 1 ft.lbf= 0.3238 calorie = 0.1383 kg.m = 1.356 J = 1.356 N.m

A. 1 Pascal second = 10 poise

C. 1 ppm = 1 ml/m3 = 1 mg/kg

D. 1 kgf= 9.8 Newton

A. s compared to that for strong acids and bases

B. a</strong>

C. solution of the anhydrous substance and its heat of hydration

D. ure & amount of the solute & the solvent, on the temperature & on the initial & final

E. centrations of the solution

F. The accompanying enthalpy change, when a solute is dissolved in solvent, depends upon the

A. The net change in entropy in any reversible cycle is always zero

B. The entropy of the system as a whole in an irreversible process increases

C. The entropy of the universe tends to a maximum

A. System (of partially miscible liquid pairs), in which the mutual solubility increases with rise

B. temperature, are said to possess an upper consolute temperature

C. Systems, in which the mutual solubility increases with decrease in temperature, are said to

D. sess lower consolute temperature

E. Nicotine-water system shows both an upper as well as a lower consolute temperature,

F. lying that they are partially miscible between these two limiting temperatures

A. The chemical formula of oleum is H2S2O7, which is formed by saturating sulphuric acid with

B. Vitriol oil is nothing but technical sulphuric acid

C. phur trioxide

D. Conversion of SO2 to SO3 in Monsanto-4 pass converter is about 98%

A. Gypsum is added to Portland cement to lengthen its setting time

C. Dry process is used for the manufacture of cement, when the raw material is blast furnace slag

D. Portland cement is made employing wet process

A. The tensile strength of a brittle material is less than its compressive strength

B. The compressive strength of a ductile material is less than its tensile strength

D. In a thick cylindrical shell, the hoop stress is maximum at the inner radius

A. Split ring type and pull through type floating heads are two commonly used floating heads is

B. t exchangers

D. Pressure drop on the shell side of a heat exchanger depends upon tube pitch also

E. In a horizontal tube evaporator, surface blanketing by air is avoided

B. The integral method of analysing kinetic data is used when the data is scattered

C. The ratio of volumes of plug flow reactor to that of mixed reactor is always less than one for identical feed composition, flow rate, conversion and for all positive reaction orders

D. The differential method of analysing kinetic data requires more accurate or larger amounts of data

A. Volume occupied by 9.034 x 1023 atoms of oxygen in ozone (O3) at NTP will be 11200 c.c

B. perature, then the fraction of total pressure exerted by the oxygen is 1/2

C. When equal weights of oxygen and methane are mixed in an empty reactor at room

E. Ten times dilution of a normal solution (N) reduces its normality to N/10

A. Presence of inerts affects the equilibrium conversion of

B. Use of different catalysts in a reversible catalytic chemical reaction does not change the

C. Alumina is added as a promoter to iron catalyst in ammonia synthesis reaction

D. ilibrium composition

A. Clausius-Clapeyron equation relates the latent heat of vaporisation to the slope of the vapor pressure curve

C. Clapeyron equation is given by dP/dT = (?/T) (VG VL); where, P = vapor pressure, T = absolute temperature, ? = latent heat of vaporisation, VG and VL = volumes of gas and liquid respectively

D. At the boiling point of liquid at the prevailing total pressure, saturated absolute humidity is infinite