All Free Chemical Engineering MCQs with Answers
Every Chemical Engineering question in the bank, across all chapters, each with the correct answer and a written explanation. Free and unlimited, with no account needed.
6,983 questions · page 103 of 350
- A. Be a good absorber of neutrons
- B. Be capable of attaining high temperature, only when it is pressurised
- C. Have high density, but low heat transfer co-efficient
- D. Be free from radiation damage and non-corrosive
Explanation: A reactor coolant should resist radiation damage and chemical attack so that it remains safe and does not corrode the core or piping.
Correct answer: Be free from radiation damage and non-corrosive- A. 1
- B. 2
- C. 3
- D. 4
Explanation: The absorbed neutron gives a total mass number of 236, while xenon-139 plus strontium-94 accounts for 233.
Correct answer: 3- A. NO
- B. O2
- C. CO2
- D. NO2
Explanation: CO₂ is diamagnetic because all its electrons are paired. O₂, NO, and NO₂ have unpaired electrons and are paramagnetic, so they are…
Correct answer: CO2- A. Haldane apparatus
- B. Mass spectrometer
- C. Chromatograph
- D. Both B. and C.
Explanation: Gas chromatography separates and quantitatively measures the individual components of natural gas, while mass spectrometry can identify…
Correct answer: Both B. and C.- A. Alkali metals
- B. Solids
- C. Natural gas
- D. Isotopes
Explanation: Flame photometry measures the characteristic emission of easily excited metal ions, especially alkali metals such as sodium and potassium.
Correct answer: Alkali metals- A. pH value
- B. All A., B. & C.
- C. Composition of complex ions
- D. Degree of hydrolysis
Explanation: Potentiometric emf measurements can be used to determine pH and, through suitable equilibrium-cell measurements, hydrolysis and…
Correct answer: All A., B. & C.- A. 50
- B. 100
- C. 10
- D. 1
Explanation: Distilled water has very low ionic content, so its conductivity is only about 1 micromho/cm at ordinary temperature.
Correct answer: 1- A. Fahrenheit
- B. Centigrade
- C. Kelvin
- D. Reaumer
Explanation: Fahrenheit's scale was the first widely developed empirical temperature scale, preceding the Celsius and Kelvin scales.
Correct answer: Fahrenheit- A. Kinematic viscosity
- B. Surface tension
- C. Refractive index
- D. Optical activity
Explanation: A stalagmometer determines surface tension from the number or mass of drops formed from a capillary tip.
Correct answer: Surface tension- A. Alloys
- B. Solids
- C. Isotopes
- D. None of these
Explanation: A mass spectrometer separates particles according to mass-to-charge ratio, making it especially useful for identifying and measuring…
Correct answer: Isotopes- A. The function is exponential
- B. The Laplace transform integral of exp(at) has initial values only for s > a
- C. The Laplace transform of integral of exp(at) has finite values only for s > a
- D. The function exp(at) is piece-wise continuous only for s > a
Explanation: The transform integral is ∫₀∞e^{-(s-a)t}dt, which converges only when s-a>0. Therefore the Laplace transform exists only for s>a.
Correct answer: The Laplace transform of integral of exp(at) has finite values only for s > a- A. V2
- B. 2V
- C. V/4
- D. V/2
Explanation: At constant temperature, Boyle's law gives P₁V₁ = P₂V₂. Doubling the pressure from 1 to 2 kgf/cm² therefore halves the volume to V/2.
Correct answer: V/2- A. P/3
- B. 3P
- C. 9P2
- D. 9P
Explanation: Boyle's law states that pressure varies inversely with volume at constant temperature. If the volume becomes 3V, the pressure becomes P/3.
Correct answer: P/3- A. 102
- B. 103
- C. 104
- D. 105
Explanation: Since 1 N = 1 kg·m/s² and 1 dyne = 1 g·cm/s², converting kilograms and metres gives 1 N = 10⁵ dynes. Thus, option d is correct.
Correct answer: 105- A. 56
- B. 100
- C. 144
- D. 1000
Explanation: The decomposition reaction is CaCO₃ → CaO + CO₂, with molar masses 100 and 56 respectively.
Correct answer: 1002056. The elevation in boiling point of a solution is proportional to the ______________ of the solution?
- A. Molal concentration
- B. Reciprocal of the molal concentration
- C. Normality
- D. Molarity
Explanation: For a dilute solution, boiling-point elevation follows ΔTb = Kb m, so it is proportional to molality, the moles of solute per kilogram of…
Correct answer: Molal concentration- A. Normally
- B. Molarity
- C. Molality
- D. Formality
Explanation: Normality is defined as gram equivalents of solute per litre of solution.
Correct answer: Normally- A. None of these
- B. Different elevation in boiling point
- C. Elevation in boiling point in the ratio of their molecular weights
- D. Same elevation in boiling point
Explanation: Boiling-point elevation depends on molality, the number of solute moles per mass of solvent.
Correct answer: Same elevation in boiling point- A. 1
- B. 9
- C. 4
- D. 252
Explanation: Using 1 Btu = 0.252 kcal and 1 ft³ = 0.02832 m³, 1 Btu/ft³ becomes 0.252/0.02832 ≈ 8.9 kcal/m³. This rounds to 9 kcal/m³.
Correct answer: 9- A. 2
- B. 1
- C. 0.5
- D. 0.05
Explanation: Molality is moles of solute per kilogram of solvent. Thus, 1 kmol divided by 2000 kg gives 0.5 kmol per 1000 kg, or 0.5 mol/kg.
Correct answer: 0.5