Free Chemical Process Principles MCQs with Answers

• A. Is a better neutron moderator as well
• B. All A., B. and C.
• C. Has a better heat transfer characteristics, and it can be pressurised to attain a high temperature
• D. Require comparatively smaller pumps and heat exchanger for a given heat transfer rate

Explanation: Water has much higher density, heat capacity, and heat-transfer capability than gases, so smaller equipment can handle the same duty…

• A. Breeder
• B. Power
• C. Research
• D. Homogeneous

Explanation: Research reactors are designed to produce intense neutron beams for isotope production, neutron experiments, and materials testing.

• 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.

• 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.

• 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…

• 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…

• 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.

• 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…

• 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.

• 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.

• 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.

• 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…

• 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.

• 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.

• 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.

• 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.

• A. 56
• B. 100
• C. 144
• D. 1000

Explanation: The decomposition reaction is CaCO₃ → CaO + CO₂, with molar masses 100 and 56 respectively.

• 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…

• A. Normally
• B. Molarity
• C. Molality
• D. Formality

Explanation: Normality is defined as gram equivalents of solute per litre of solution.

• 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.