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MCQOPTIONS
This section includes 8247 Mcqs, each offering curated multiple-choice questions to sharpen your Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 5451. |
A saturated vapor on being compressed would |
| A. | condense |
| B. | form wet steam |
| C. | both (a) & (b) |
| D. | neither (a) nor (b) |
| Answer» D. neither (a) nor (b) | |
| 5452. |
In case of a solution (not of a solid in a liquid), whose total volume is less than the sum of the volumes of its components in their pure states, solubility is |
| A. | independent of temperature. |
| B. | increases with rise in pressure. |
| C. | increased with decrease in pressure. |
| D. | unchanged with pressure changes. |
| Answer» C. increased with decrease in pressure. | |
| 5453. |
Pure oxygen is mixed with air to produce an enriched air containing 50 volume % of oxygen. The ratio of moles of air to oxygen used is |
| A. | 1.72 |
| B. | 0.58 |
| C. | 0.5 |
| D. | 0.2 |
| Answer» C. 0.5 | |
| 5454. |
Normality of a solution does not change with the increase in the |
| A. | pressure |
| B. | temperature |
| C. | solute concentration |
| D. | dilution of the solution |
| Answer» B. temperature | |
| 5455. |
The accumulation in a steady state combustion process, burning 1 kg mole of carbon with 1 kg mole of oxygen thereby producing 1 kg mole of carbon dioxide, is __________ kg mole. |
| A. | 1 |
| B. | 0 |
| C. | 16 |
| D. | 44 |
| Answer» C. 16 | |
| 5456. |
Addition of a non-volatile solute to a pure solvent |
| A. | increases its freezing point. |
| B. | increases its boiling point. |
| C. | decreases its freezing point. |
| D. | both (b) and (c) |
| Answer» E. | |
| 5457. |
The depression in freezing point of a solution is |
| A. | inversely proportional to the mass of solvent. |
| B. | directly proportional to the mole of solute. |
| C. | both (a) and (b). |
| D. | neither (a) nor (b). |
| Answer» D. neither (a) nor (b). | |
| 5458. |
A gas mixture contains 6 moles of H2 and 2 moles of N2. If the total pressure of the gaseous mixture is 4 kgf/cm2 ; then the partial pressure of N2 in the mixture will be __________ kgf/cm2 . |
| A. | 1 |
| B. | 2 |
| C. | 4 |
| D. | 8 |
| Answer» B. 2 | |
| 5459. |
How much O2 can be obtained from 90 kg of water ? |
| A. | 32 kg |
| B. | 80 kg |
| C. | 64 kg |
| D. | 90 kg |
| Answer» C. 64 kg | |
| 5460. |
The boiling points for pure water and pure toluene are 100 C and 110.6 C respectively. Toluene and water are completely immiscible in each other. A well agitated equimolar mixture of toluene and water are prepared. The temperature at which the above mixture will exert a pressure of one standard atm. is |
| A. | less than 100 C |
| B. | 100 C |
| C. | between 100 and 110 C |
| D. | 110.6 C |
| Answer» D. 110.6 C | |
| 5461. |
A solution of specific gravity 1 consists of 35% A by weight and the remaining B. If the specific gravity of A is 0.7, the specific gravity of Bis |
| A. | 1.25 |
| B. | 1.3 |
| C. | 1.35 |
| D. | 1.2 |
| Answer» E. | |
| 5462. |
Sodium __________ has inverted solubility curve i.e. its solubility increases with the lowering of temperature. |
| A. | carbonate (monohydrate) |
| B. | chloride |
| C. | thiosulphate |
| D. | bisulphite |
| Answer» B. chloride | |
| 5463. |
Which of the following has the least (almost negligible) effect on the solubility of a solute in a solvent ? |
| A. | Temperature |
| B. | Nature of solute |
| C. | Pressure |
| D. | Nature of solvent |
| Answer» D. Nature of solvent | |
| 5464. |
If the partial pressure of the solvent in the vapor phase is equal to the vapor pressure of the solvent at that temperature, then the system is said to be at its |
| A. | bubble point. |
| B. | saturation temperature. |
| C. | dew point. |
| D. | both (b) and (c). |
| Answer» E. | |
| 5465. |
At higher temperatures, molal heat capacities for most of the gases (at constant pressure) __________ with increase in temperature. |
| A. | varies linearly |
| B. | increases |
| C. | decreases |
| D. | does not vary |
| Answer» C. decreases | |
| 5466. |
The average value of heat of neutralisation of dilute solution of strong acids and strong bases is about __________ kcal/kg.mole of water formed. |
| A. | 6680 |
| B. | 13360 |
| C. | 2481 |
| D. | 97302 |
| Answer» C. 2481 | |
| 5467. |
In a mixture of benzene vapor and nitrogen gas at a total pressure of 900 mm Hg, if the absolute humidity of benzene is 0.2 kg benzene/kg nitrogen, the partial pressure of benzene in mm Hg is |
| A. | 180 |
| B. | 60.3 |
| C. | 720 |
| D. | 200 |
| Answer» C. 720 | |
| 5468. |
For an ideal gas, the compressibility factor |
| A. | decreases with pressure rise. |
| B. | is unity at all temperature. |
| C. | is unity at Boyle's temperature. |
| D. | zero. |
| Answer» C. is unity at Boyle's temperature. | |
| 5469. |
Pick out the wrong unit conversion. |
| A. | 1 atm. = 760 mm Hg = 29.92 inch Hg = 14.7 psi = 1.013 bar = 1.013 kgf/cm |
| B. | <sup>2</sup> |
| C. | 1 kPa = 100 bar |
| D. | 1 mm Hg = 1 torr = 133.3 Pa |
| E. | - |
| Answer» C. 1 kPa = 100 bar | |
| 5470. |
The value of (Cp - Cv)for a real gas obeying Vander Wall's equation is |
| A. | R |
| B. | > R |
| C. | < R |
| D. | 0.5 R |
| Answer» C. < R | |
| 5471. |
A fluid gas produced on burning furnace oil contains 0.15 gm mole of CO2, 0.05 gm mole of oxygen and 0.80 gm mole of N2. What is its molecular weight ? |
| A. | 28.6 |
| B. | 30.0 |
| C. | 30.6 |
| D. | 32.6 |
| Answer» D. 32.6 | |
| 5472. |
A gaseous mixture contains 14 kg of N2, 16 kg of O2 and 17 kg of NH3. The mole fraction of oxygen is |
| A. | 0.16 |
| B. | 0.33 |
| C. | 0.66 |
| D. | 0.47 |
| Answer» C. 0.66 | |
| 5473. |
In which of the following case of mixing of a strong acid with strong base (each of 1N concentration), temperature increase will be the highest ? |
| A. | 30 c.c acid and 30 c.c base. |
| B. | 20 c.c acid and 25 c.c base. |
| C. | 15 c.c acid and 35 c.c base. |
| D. | 35 c.c acid and 15 c.c base. |
| Answer» B. 20 c.c acid and 25 c.c base. | |
| 5474. |
The quantity of heat required to evaporate 1 kg of a saturated liquid is called |
| A. | specific heat |
| B. | 1 Kcal |
| C. | sensible heat |
| D. | latent heat |
| Answer» E. | |
| 5475. |
A gas at 0 C was subjected to constant pressure cooling until its volume became half the original volume. The temperature of the gas at this stage will be |
| A. | 0 C |
| B. | 0 K |
| C. | -136.5 C |
| D. | -136.5 K |
| Answer» D. -136.5 K | |
| 5476. |
A car tyre of volume 0.057 m3 is inflated to 300 kPa at 300 K. After the car is driven for 10 hours, the pressure in the tyre increases to 330 kPa. Assume air is an ideal gas and Cv for air is 21 J/mole.K. The change in the internal energy of air in the tyre in J/mole is |
| A. | 380 |
| B. | 630 |
| C. | 760 |
| D. | 880 |
| Answer» C. 760 | |
| 5477. |
The density of a gas 'X' is twice that of another gas 'Y'. If the molecular weight of gas 'Y' is 'M'; then the molecular weight of the gas 'X' will be |
| A. | 2M |
| B. | M/2 |
| C. | M |
| D. | M/4 |
| Answer» B. M/2 | |
| 5478. |
The equilibrium data of component A in the two phases B and C are given below. The estimate of Y for X = 4 by fitting a quadratic expression of a form Y = mX2 for the above data is |
| A. | 15.5 |
| B. | 16 |
| C. | 16.5 |
| D. | 17 |
| Answer» D. 17 | |
| 5479. |
pH value of a solution containing equal concentration of hydroxyl and hydrogen ions will be |
| A. | 0 |
| B. | 10 |
| C. | 7 |
| D. | 14 |
| Answer» D. 14 | |
| 5480. |
The percentage ratio of the partial pressure of the vapor to the vapor pressure of the liquid at the existing temperature is |
| A. | termed as relative saturation. |
| B. | not a function of the composition of gas mixture. |
| C. | called percentage saturation. |
| D. | not a function of the nature of vapor. |
| Answer» B. not a function of the composition of gas mixture. | |
| 5481. |
Volume occupied by one gm mole of a gas at S.T.P. is |
| A. | 22.4 litres |
| B. | 22400 litres |
| C. | 22.4 c.c |
| D. | 359 litres |
| Answer» B. 22400 litres | |
| 5482. |
The total number of atoms in 8.5 gm of NH3 is __________ x 1023. |
| A. | 9.03 |
| B. | 3.01 |
| C. | 1.204 |
| D. | 6.02 |
| Answer» B. 3.01 | |
| 5483. |
The atomic weight of helium is 4 times that of hydrogen. Its diffusion rate as compared to hydrogen will be __________ times. |
| A. | 1/2 |
| B. | 4 |
| C. | <span class="root">2</span> |
| D. | 1/4 |
| Answer» D. 1/4 | |
| 5484. |
Osmotic pressure exerted by a solution prepared by dissolving one gram mole of a solute in 22.4 litres of a solvent at 0 C will be __________ atmosphere. |
| A. | 0.5 |
| B. | 1 |
| C. | 1.5 |
| D. | 2 |
| Answer» C. 1.5 | |
| 5485. |
In general, the specific heats of aqueous solutions __________ with increase in the concentration of the solute. |
| A. | increase |
| B. | decrease |
| C. | remain unchanged |
| D. | none of these |
| Answer» C. remain unchanged | |
| 5486. |
The ratio of existing moles of vapor per mole of vapor free gas to the moles of vapor that would be present per mole of vapor free gas, if the mixture were saturated at the existing temperature & pressure, is termed as the |
| A. | relative humidity. |
| B. | relative saturation. |
| C. | percentage saturation. |
| D. | none of these. |
| Answer» D. none of these. | |
| 5487. |
The vapour pressure of water is given by, in Psat = A - (5000/T), where A is a constant, Psat is the vapour pressure in atm. and T is the temperature in K.The vapor pressure of water in atm. at 50 C is approximately |
| A. | 0.07 |
| B. | 0.09 |
| C. | 0.11 |
| D. | 0.13 |
| Answer» E. | |
| 5488. |
A vapor whose partial pressure is less than its equilibrium vapor pressure is called the __________ vapor. |
| A. | saturated |
| B. | superheated |
| C. | unsaturated |
| D. | dry gaseous |
| Answer» C. unsaturated | |
| 5489. |
Isotopes are atoms having the same |
| A. | mass number |
| B. | number of neutrons |
| C. | atomic mass |
| D. | none of these |
| Answer» E. | |
| 5490. |
500 c.c. each of hydrogen at 700 mm Hg pressure and oxygen at 600 mm Hg pressure are put together in a vessel of 1 litre capacity. The final pressure of the gas mixture will be __________ mm Hg. |
| A. | 650 |
| B. | 700 |
| C. | 600 |
| D. | 375 |
| Answer» B. 700 | |
| 5491. |
Disappearance of snow in subzero weather exemplifies the process of |
| A. | evaporation |
| B. | sublimation |
| C. | vaporisation |
| D. | melting |
| Answer» C. vaporisation | |
| 5492. |
Except for monoatomic gases, the molal heat capacity at constant volume for all gases is __________ Kcal/Kg mole. K. |
| A. | 3 |
| B. | > 3 |
| C. | < 3 |
| D. | < 1 |
| Answer» C. < 3 | |
| 5493. |
Heat of reaction is a function of the |
| A. | pressure |
| B. | temperature |
| C. | both(a)&(b) |
| D. | neither (a) nor (b) |
| Answer» D. neither (a) nor (b) | |
| 5494. |
The gravimetric (i.e., by weight) composition of a vapor saturated gas is independent of the |
| A. | nature of both the gas & the liquid. |
| B. | temperature. |
| C. | total pressure. |
| D. | none of these. |
| Answer» E. | |
| 5495. |
In the reaction, Ca + 2H2O = Ca(OH)2 + H2 ; what volume (c.c.) of hydrogen at STP would be liberated, when 8 gm of calcium reacts with excess water ? (atomic weight of calcium = 40) |
| A. | 4480 |
| B. | 2240 |
| C. | 1120 |
| D. | 0.4 |
| Answer» B. 2240 | |
| 5496. |
Methane is mixed with stoichiometric proportion of oxygen and completely combusted. The number of additional specifications required to determine the product flow rate and composition is |
| A. | 0 |
| B. | 1 |
| C. | 2 |
| D. | 3 |
| Answer» B. 1 | |
| 5497. |
An aqueous solution of 2.45% by weight H2SO4 has a specific gravity of 1.011. The composition expressed in normality is |
| A. | 0.2500 |
| B. | 0.2528 |
| C. | 0.5000 |
| D. | 0.5055 |
| Answer» E. | |
| 5498. |
With rise in temperature, the heat capacity of a substance |
| A. | increases |
| B. | decreases |
| C. | remains unchanged |
| D. | either (a) or (b); depends on the substance |
| Answer» B. decreases | |
| 5499. |
The temperature at which a real gas obeys Boyle's law is termed as the |
| A. | triple point |
| B. | Boyle's temperature |
| C. | eutectic point |
| D. | inversion temperature |
| Answer» C. eutectic point | |
| 5500. |
Variation of vapor pressure with temperature can be calculated using Clausius-Clapeyron equation, which assumes that the |
| A. | vapor follows the ideal gas law. |
| B. | molal latent heat of vaporisation is constant within the limited temperature range. |
| C. | volume in the liquid state is negligible compared with that in the vapor state. |
| D. | all (a), (b) & (c). |
| Answer» E. | |