MCQOPTIONS
Saved Bookmarks
MCQOPTIONS
This section includes 689 Mcqs, each offering curated multiple-choice questions to sharpen your Chemical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 301. |
Cv for monoatomic gases is equal to(where, R = gas constant) |
| A. | R |
| B. | 1.5 R |
| C. | 2R |
| D. | 3R |
| Answer» C. 2R | |
| 302. |
The density of a gas at N.T.P.is 'ρ'. Keeping the pressure constant (i.e. 760 mm Hg), the 3 density of the gas will become ¾ 0.75ρ at a temperature of __________ °K |
| A. | 273° |
| B. | 300° |
| C. | 400° |
| D. | 300° |
| Answer» D. 300° | |
| 303. |
What is the total pressure exerted by a mixture of 0.45 kg mole of benzene, 0.44 kg mole of toluene and 0.23 kg mole of o-xylene at 100°C, if their vapor pressures at 100°C are 1340, 560 and 210 mmHg respectively? |
| A. | 756.2 |
| B. | 780.5 |
| C. | 801.5 |
| D. | 880.5 |
| Answer» D. 880.5 | |
| 304. |
80 kg of Na₂SO₄ (molecular weight = 142) is present in 330 kg of an aqueous solution. The solution is cooled such that. 80 kg of Na₂SO₄ .10H₂O crystals separate out. The weight fraction of Na₂SO₄ in the remaining solution is |
| A. | 0.00 |
| B. | 0.18 |
| C. | 0.24 |
| D. | 1.00 |
| Answer» C. 0.24 | |
| 305. |
1m³ is approximately equal to |
| A. | 28 litres |
| B. | 35 ft³ |
| C. | 4.5 litres |
| D. | 4.5 ft³ |
| Answer» C. 4.5 litres | |
| 306. |
Vapor pressure of water at 100°C is about __________ bar. |
| A. | 0.1013 |
| B. | 1.013 |
| C. | 10.13 |
| D. | 101.3 |
| Answer» C. 10.13 | |
| 307. |
Na₂SO₄. 10H₂O crystals are formed by cooling 100 Kg of 30% by weight aqueous solution of Na₂SO₄. The final concentration of the solute in the solution is 10%. The weight of crystals is |
| A. | 20 |
| B. | 32.2 |
| C. | 45.35 |
| D. | 58.65 |
| Answer» E. | |
| 308. |
1 kgf/cm² is not equal to |
| A. | 1 torr |
| B. | 1 bar |
| C. | 10000 mm wc |
| D. | 100 KPa = 100 000 N/m² |
| Answer» B. 1 bar | |
| 309. |
1 kg/cm² is equal to |
| A. | 760 torr |
| B. | 1KPa |
| C. | 10 metres of water column |
| D. | 1 metre of water column |
| Answer» D. 1 metre of water column | |
| 310. |
One kg of saturated steam at 100°C and 1.01325 bar is contained in a rigid walled vessel. It lias a volume of 1.673 m³. It cools to 98°C ; the saturation pressure is 0.943 bar ; one kg of water vapour under these conditions has a volume of 1.789 m³. The latent heat of condensation (kJ/kg⁻¹ ) under these conditions is |
| A. | 40732 |
| B. | 2676 |
| C. | 2263 |
| D. | 540 |
| Answer» D. 540 | |
| 311. |
Cp is expressed in S.I. unit as |
| A. | J/kg.°K |
| B. | 0°K |
| C. | W/m². °C |
| D. | W/m. °K |
| Answer» B. 0°K | |
| 312. |
Specific gravity on API scale is given by the relation(where, G = specific gravity at 15.5°C). |
| A. | °API = 200(G - 1) |
| B. | °API = (141.5/G) - 131.5 |
| C. | °API = (140/G) - 130 |
| D. | °API = 145 - (145/G) |
| Answer» C. °API = (140/G) - 130 | |
| 313. |
Cp/Cv for monoatomic gases is |
| A. | 1.44 |
| B. | 1.66 |
| C. | 1.99 |
| D. | 1 |
| Answer» C. 1.99 | |
| 314. |
Cp equals Cv at |
| A. | 0°C |
| B. | 0°K |
| C. | 0°F |
| D. | 0°R |
| Answer» C. 0°F | |
| 315. |
CaCO₃ contains __________ percent of Ca by weight. |
| A. | 40 |
| B. | 48 |
| C. | 96 |
| D. | 12 |
| Answer» B. 48 | |
| 316. |
Two solutions A₁ and A₂ have pH value of 2 and 6 respectively. It implies that the solution |
| A. | A₁ is more alkaline than solution A₂ |
| B. | A₁ is highly acidic |
| C. | A₁ is very slightly acidic |
| D. | Both A & C |
| Answer» E. | |
| 317. |
The temperature of a gas in a closed container is 27° C. If the temperature of the gas is incresed to 300° C, then the pressure exerted is |
| A. | Doubled |
| B. | Halved |
| C. | Trebled |
| D. | Unpredictable |
| Answer» E. | |
| 318. |
Cp - Cv, for an ideal gas is equal to |
| A. | R |
| B. | R/2 |
| C. | 2R |
| D. | 3R |
| Answer» B. R/2 | |
| 319. |
1 Pascal (unit of pressure) is equal to __________ N/m². |
| A. | 10 |
| B. | 1 |
| C. | 0.1 |
| D. | 1000 |
| Answer» C. 0.1 | |
| 320. |
The heat evolved in the combustion of benzene is represented by the equation:C₆H₆ + 7.5 O₂ = 6CO₂ + 3H₂O, ΔH = 3264.6 kJ/kg. moleThe heat energy change, when 39 gm of C₆H₆ is burnt in an open container, will be __________ kJ/kgmole. |
| A. | +816.15 |
| B. | +1632.3 |
| C. | -1632.3 |
| D. | -2448.45 |
| Answer» D. -2448.45 | |
| 321. |
Which of the following is not a unit of kinematic viscosity? |
| A. | Poise |
| B. | Stoke |
| C. | Cm²/second |
| D. | None of these |
| Answer» B. Stoke | |
| 322. |
Assuming that CO₂ obeys perfect gas law, calculate the density of CO₂ (in kg/m³) at 263°C and 2 atm. |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» C. 3 | |
| 323. |
A gas at 0°C is cooled at constant pressure until its volume becomes half the original volume. The temperature of the gas at this state will be |
| A. | -136.5°C |
| B. | - 136.5°K |
| C. | -273°C |
| D. | 0°K |
| Answer» B. - 136.5°K | |
| 324. |
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 | |
| 325. |
The OH⁻ concentration in a solution having pH value 3 is |
| A. | 10-3 |
| B. | 10-10 |
| C. | 10-11 |
| D. | 10-13 |
| Answer» D. 10-13 | |
| 326. |
Which of the following ratios defines the recycle ratio in a chemical process? |
| A. | Gross feed stream/recycle feed stream |
| B. | Recycle stream/fresh feed stream |
| C. | Recycle stream/gross feed stream |
| D. | None of these |
| Answer» C. Recycle stream/gross feed stream | |
| 327. |
Which of the following holds good for a solution obeying Raoult's law (i.e., an ideal solution) (where, ΔH = heat of mixing, and ΔV = volume change on mixing ) ? |
| A. | ΔH = 1 (+ ve)and Δ V = -ve |
| B. | ΔH = 0 |
| C. | ΔV = 0 |
| D. | Both B and C |
| Answer» E. | |
| 328. |
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 | |
| 329. |
A sample of well water contains 140 gm/m³ Ca²⁺ ions and 345 gm/m³ Na⁺ ions. The hardness of the sample of water, expressed in terms of equivalent CaCO₃ in gm/m³ is (assuming atomic masses of Ca :40, Na : 23, C : 12, O : 16) |
| A. | 350 |
| B. | 485 |
| C. | 140 |
| D. | 345 |
| Answer» B. 485 | |
| 330. |
For most salts, the solubility increases with rise in temperature, but the solubility of __________ is nearly independent of temperature rise. |
| A. | sodium chloride |
| B. | sodium carbonate monohydrate |
| C. | anhydrous sodium sulphate |
| D. | hypo |
| Answer» B. sodium carbonate monohydrate | |
| 331. |
An aqueous solution of 2.45% by weight H2SO4 has a specific gravity of 1.011. The composition expressed in normality is |
| A. | 0.25 |
| B. | 0.2528 |
| C. | 0.5 |
| D. | 0.5055 |
| Answer» E. | |
| 332. |
The average translational kinetic energy with which a gas molecule is endowed is dependent on its |
| A. | nature |
| B. | size |
| C. | absolute temperature |
| D. | all (a), (b) & (c) |
| Answer» D. all (a), (b) & (c) | |
| 333. |
Applicability of Claussius-Clapeyron equation is subject to the condition that the |
| A. | vapor follows ideal gas law. |
| B. | volume in the liquid state is negligible. |
| C. | both (a) & (b) |
| D. | neither (a) nor (b) |
| Answer» D. neither (a) nor (b) | |
| 334. |
The reaction A + B ‚Üí C has been conducted in a reactor as shown below. The number of balances (material) that can be made around the reactor are$ |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» D. 4 | |
| 335. |
1 kg of calcium carbide (CaC2) produces about 0.41 kg of acetylene gas on treatment with water. How many hours of service can be derived from 1 kg of calcium carbide in an acetylene lamp burning 35 litres of gas at NTP per hour ? |
| A. | 5 |
| B. | 10 |
| C. | 15 |
| D. | 20 |
| Answer» C. 15 | |
| 336. |
Enthalpy of a vapor gas mixture may be increased by increasing the |
| A. | temperature at constant humidity. |
| B. | humidity at constant temperature. |
| C. | temperature and the humidity. |
| D. | all (a), (b) & (c). |
| Answer» E. | |
| 337. |
Avogadro number is the number of molecules in one __________ of a gas. |
| A. | gram |
| B. | kilogram |
| C. | gm.mole |
| D. | litre |
| Answer» D. litre | |
| 338. |
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 | |
| 339. |
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 | |
| 340. |
At higher temperature, molal heat capacities of most of the gases (at constant pressure) __________ with increase in temperature. |
| A. | increases |
| B. | decreases |
| C. | remains unchanged |
| D. | increases linearly |
| Answer» B. decreases | |
| 341. |
One of the specific gravity scales is "Brix" (used speicifically for sugar solution). It is defined as |
| A. | Brix = (400/G) - 400 |
| B. | Brix = 200 (G-1) |
| C. | Brix = 145 - (145/G) |
| D. | none of these |
| Answer» B. Brix = 200 (G-1) | |
| 342. |
Pick out the correct conversion. |
| A. | 1 BTU =453.6 calories |
| B. | 1 BTU = 252 calories |
| C. | 1 calorie = 252 BTU |
| D. | 1 calorie = 453.6 BTU |
| Answer» C. 1 calorie = 252 BTU | |
| 343. |
The amount of Zn (atomic weight = 65) required to form 224 c.c. of H2 at N.T.P. on treatment with dilute H2SO4 will be __________ gm. |
| A. | 0.065 |
| B. | 0.65 |
| C. | 6.5 |
| D. | 65 |
| Answer» C. 6.5 | |
| 344. |
Cp - Cv, for an ideal gas is equal to |
| A. | R |
| B. | R/2 |
| C. | 2R |
| D. | 3R |
| Answer» B. R/2 | |
| 345. |
The temperature at which the second Virial co-efficient of a real gas is zero is called the |
| A. | eutectic point |
| B. | Boyle temperature |
| C. | boiling point |
| D. | critical temperature |
| Answer» B. Boyle temperature | |
| 346. |
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. | |
| 347. |
Percentage saturation of a vapor bearing gas is always __________ the relative saturation. |
| A. | higher than |
| B. | smaller than |
| C. | equal to |
| D. | either (a) or (b); depends on the system |
| Answer» C. equal to | |
| 348. |
Validity of the relationship, inputs = outputs, holds good for the system at steady state |
| A. | with chemical reaction. |
| B. | without chemical reaction. |
| C. | without chemical reaction & losses. |
| D. | none of these. |
| Answer» D. none of these. | |
| 349. |
The OH- concentration in a solution having pH value 3 is |
| A. | 43534 |
| B. | 43748 |
| C. | 43779 |
| D. | 41548 |
| Answer» D. 41548 | |
| 350. |
Which of the following gravity scales is used exclusively for liquids heavier than water ? |
| A. | Baumme scale |
| B. | Twaddel scale |
| C. | API scale |
| D. | none of these |
| Answer» C. API scale | |